gcc/gcc
J"orn Rennecke 35d6034bcb reload.c (can_reload_into): New function.
* reload.c (can_reload_into): New function.
	(push_reload): Use it.

From-SVN: r68542
2003-06-26 21:07:23 +01:00
..
ada c-opts.c (missing_arg): Make non-static. 2003-06-26 06:05:36 +00:00
config h8300.c (compute_a_rotate_length): Fix the references to the amount of a rotation. 2003-06-26 17:50:01 +00:00
cp call.c (build_op_delete_call): Use strip_array_call. 2003-06-26 15:23:54 +00:00
doc * doc/invoke.texi (-fprofile-values): Document. 2003-06-26 10:16:31 +00:00
f c-opts.c (missing_arg): Make non-static. 2003-06-26 06:05:36 +00:00
fixinc alloc-pool.c: Don't check HAVE_LONG_DOUBLE. 2003-06-17 14:10:01 +00:00
ginclude stddef.h: Provide C++ safe offsetof. 2003-04-22 12:28:51 +00:00
intl Makefile.in (.y.c): Only enable production rule when maintaining. 2003-03-14 21:36:28 +00:00
java c-opts.c (missing_arg): Make non-static. 2003-06-26 06:05:36 +00:00
objc re PR c/10178 (ICE in tree_low_cst) 2003-06-25 17:29:14 +00:00
po * exgettext: Add "This file is part of GCC". 2003-05-23 17:52:54 +00:00
testsuite reload.c (can_reload_into): New function. 2003-06-26 21:07:23 +01:00
treelang tree.h (expand_function_end): Remove all parameters. 2003-06-20 09:08:23 +00:00
.cvsignore
ABOUT-GCC-NLS
ABOUT-NLS
COPYING
COPYING.LIB
ChangeLog reload.c (can_reload_into): New function. 2003-06-26 21:07:23 +01:00
ChangeLog.0 ChangeLog: Follow spelling conventions. 2002-09-22 02:03:17 +00:00
ChangeLog.1 ChangeLog.1: Fix a typo. 2003-06-23 16:11:56 +00:00
ChangeLog.2 ChangeLog: Follow spelling conventions. 2003-06-12 19:01:08 +00:00
ChangeLog.3 ChangeLog.3: Fix comment typos. 2003-06-17 19:03:12 +00:00
ChangeLog.4 ChangeLog: Follow spelling conventions. 2002-12-19 05:18:13 +00:00
ChangeLog.5 ChangeLog: Follow spelling conventions. 2002-12-19 05:18:13 +00:00
ChangeLog.6 ChangeLog.3: Fix comment typos. 2003-06-17 19:03:12 +00:00
ChangeLog.7 Fix typos. 2002-11-15 14:53:41 +01:00
ChangeLog.8 ChangeLog: Rotated last year's entries to... 2003-03-13 19:20:26 +00:00
ChangeLog.lib
FSFChangeLog
FSFChangeLog.10 ChangeLog.4: Fix typos. 2002-09-28 15:29:45 +00:00
FSFChangeLog.11 ChangeLog.1: Follow spelling conventions. 2002-09-26 12:29:45 +00:00
LANGUAGES LANGUAGES: Follow spelling conventions. 2002-09-27 12:48:07 +00:00
Makefile.in postreload.c (reload_cse_simplify_set): Call cselib_lookup earlier. 2003-06-26 14:08:15 +00:00
ONEWS re PR other/895 (top of ONEWS needs to be merged into EGCS release notes) 2003-03-29 11:35:07 +00:00
README-fixinc
README.Portability README.Portability: Move to a new section and obsolete K+R portability issues. 2003-04-19 15:53:44 +00:00
SERVICE
acconfig.h
aclocal.m4 safe-ctype.h (HC_UNKNOWN, [...]): New #defines. 2003-06-21 23:22:30 +00:00
alias.c tracer.c: Remove duplication declaration. 2003-06-16 13:42:26 +02:00
alloc-pool.c alloc-pool.c: Don't check HAVE_LONG_DOUBLE. 2003-06-17 14:10:01 +00:00
alloc-pool.h alloc-pool.c: Convert to ISO C90 prototypes. 2003-06-15 15:43:32 +02:00
attribs.c alloc-pool.c: Convert to ISO C90 prototypes. 2003-06-15 15:43:32 +02:00
basic-block.h Makefile.in (cfgrtl.o): Add expr.h dependency. 2003-06-26 06:13:27 +00:00
bb-reorder.c alloc-pool.c: Convert to ISO C90 prototypes. 2003-06-15 15:43:32 +02:00
bitmap.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
bitmap.h alloc-pool.c: Convert to ISO C90 prototypes. 2003-06-15 15:43:32 +02:00
bt-load.c Makefile.in (bt-load.o): Depend on $(TM_P_H). 2003-06-25 15:53:07 +00:00
builtin-attrs.def builtin-attrs.def, [...]: Don't use macros from "symcat.h", instead rely on ISO C. 2003-06-16 19:14:22 +00:00
builtin-types.def builtins.def (BUILT_IN_BCOPY, [...]): New. 2003-04-28 14:10:35 +02:00
builtins.c builtins.c (expand_builtin_mathfn): Always stabilize the argument list against re-evaluation. 2003-06-26 11:53:00 +00:00
builtins.def builtins.def (BUILT_IN_CABS, [...]): New builtins representing ISO C99's cabs, cabsf and cabsl. 2003-06-03 11:27:23 +00:00
c-aux-info.c c-aux-info.c: Convert to ISO C99. 2003-06-19 21:43:59 +02:00
c-common.c c-common.c (handle_used_attribute): Use mark_referenced. 2003-06-25 22:14:26 +00:00
c-common.def tree.c (tree_size): For all 'c' and 'x' nodes... 2003-04-07 06:03:17 +00:00
c-common.h basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
c-config-lang.in
c-convert.c c-aux-info.c: Convert to ISO C99. 2003-06-19 21:43:59 +02:00
c-cppbuiltin.c c-aux-info.c: Convert to ISO C99. 2003-06-19 21:43:59 +02:00
c-decl.c c-decl.c (store_parm_decls): Make saved_warn_shadow boolean. 2003-06-20 22:56:36 +00:00
c-dump.c c-aux-info.c: Convert to ISO C99. 2003-06-19 21:43:59 +02:00
c-errors.c builtins.c (validate_arglist): Eliminate libiberty VA_ macros, always use stdarg. 2003-05-17 22:21:35 +00:00
c-format.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
c-incpath.c c-aux-info.c: Convert to ISO C99. 2003-06-19 21:43:59 +02:00
c-incpath.h c-aux-info.c: Convert to ISO C99. 2003-06-19 21:43:59 +02:00
c-lang.c re PR c/10178 (ICE in tree_low_cst) 2003-06-25 17:29:14 +00:00
c-lex.c c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c-objc-common.c c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c-opts.c c-opts.c (missing_arg): Make non-static. 2003-06-26 06:05:36 +00:00
c-parse.in c-parse.in (fndef): Set DECL_SOURCE_LINE and FILE earlier. 2003-05-21 14:27:46 +00:00
c-pch.c c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c-ppoutput.c c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c-pragma.c c-aux-info.c: Convert to ISO C99. 2003-06-19 21:43:59 +02:00
c-pragma.h Convert to ISO C90. 2003-06-22 17:07:31 +02:00
c-pretty-print.c c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c-pretty-print.h c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c-semantics.c c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c-tree.h c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c-typeck.c c-lex.c: Convert to ISO C90. 2003-06-22 15:41:26 +02:00
c.opt c-opts.c (c_common_handle_option): s/on/value/. 2003-06-16 05:47:07 +00:00
caller-save.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
calls.c * calls.c (emit_call_1): Readd lost ATTRIBUTE_UNUSED. 2003-06-22 19:46:38 +02:00
cfg.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfganal.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfgbuild.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfgcleanup.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfghooks.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfghooks.h caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfglayout.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfglayout.h caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfgloop.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfgloop.h caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfgloopanal.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfgloopmanip.c caller-save.c: Convert to ISO C90. 2003-06-22 17:03:27 +02:00
cfgrtl.c Makefile.in (cfgrtl.o): Add expr.h dependency. 2003-06-26 06:13:27 +00:00
cgraph.c Makefile.in (cgraph.o): Depend on output.h, not depend on tree-inline.h 2003-06-24 16:50:29 +00:00
cgraph.h Makefile.in (cgraph.o): Depend on output.h, not depend on tree-inline.h 2003-06-24 16:50:29 +00:00
cgraphunit.c Makefile.in (cgraph.o): Depend on output.h, not depend on tree-inline.h 2003-06-24 16:50:29 +00:00
collect2.c * collect2.c (is_ctor_dtor): Remove CFRONT_LOSSAGE dependend code. 2003-06-04 06:56:26 +02:00
collect2.h
combine.c re PR bootstrap/10983 ([SPARC64] ICE in verify_wide_reg, at flow.c:551, while compiling libjava) 2003-06-13 22:13:07 +00:00
common.opt common.opt: Add -finline-limit. 2003-06-22 20:21:35 +00:00
conditions.h
config.gcc coff.h: Don't include dbxcoff.h. 2003-06-26 16:34:32 +00:00
config.guess
config.in safe-ctype.h (HC_UNKNOWN, [...]): New #defines. 2003-06-21 23:22:30 +00:00
configure configure.in (ld_vers): Portability [sed]. 2003-06-26 04:57:15 +00:00
configure.frag
configure.in configure.in (ld_vers): Portability [sed]. 2003-06-26 04:57:15 +00:00
conflict.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
convert.c convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
convert.h
coretypes.h coretypes.h (cpp_reader): Forward declare struct. 2003-01-28 23:26:28 +00:00
coverage.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
coverage.h coverage.h (coverage_counter_alloc): New function. 2003-05-11 19:21:32 +00:00
cppcharset.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
cppdefault.c Makefile.in (C_AND_OBJC_OBJS, [...]): Update. 2003-03-01 14:31:21 +00:00
cppdefault.h Makefile.in (C_AND_OBJC_OBJS, [...]): Update. 2003-03-01 14:31:21 +00:00
cpperror.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
cppexp.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
cppfiles.c cppfiles.c: Clarify comments. 2003-06-25 21:01:10 +00:00
cpphash.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
cpphash.h cppfiles.c: Clarify comments. 2003-06-25 21:01:10 +00:00
cppinit.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
cpplex.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
cpplib.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
cpplib.h cppfiles.c: Clarify comments. 2003-06-25 21:01:10 +00:00
cppmacro.c cppfiles.c: Clarify comments. 2003-06-25 21:01:10 +00:00
cpppch.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
cppspec.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
cpptrad.c * cpplib.h, cpphash.h, cppcharset.c, cpperror.c, cppexp.c 2003-06-17 06:17:44 +00:00
crtstuff.c crtstuff.c: Remove undefined usage of INIT_SECTION_PREAMBLE. 2003-06-07 19:30:32 +02:00
cse.c cse.c (find_best_addr): Consider binary operators even if second argument is not CONST_INT. 2003-06-04 14:05:20 -07:00
cselib.c cselib.c (cselib_invalidate_regno): Abort if hardreg have a VOIDmode. 2003-05-28 23:18:29 +04:00
cselib.h reload1.c (reload_cse_noop_set_p): Return false if mode of SET_DEST is not the same as that returned by... 2003-04-17 01:07:12 +00:00
cstamp-h.in
dbxout.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
dbxout.h
dbxstclass.h
debug.c dbxout.c (scope_labelno): Add GTY. 2003-04-05 07:01:51 +00:00
debug.h dbxout.c (scope_labelno): Add GTY. 2003-04-05 07:01:51 +00:00
defaults.h * (REG_CLASS_FROM_CONSTRAINT): Only define if not already defined. 2003-06-16 11:53:22 +01:00
df.c ChangeLog: Follow spelling conventions. 2003-06-12 19:01:08 +00:00
df.h 2003-03-20 Daniel Berlin <dberlin@dberlin.org> 2003-03-20 23:02:54 +00:00
diagnostic.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
diagnostic.def
diagnostic.h diagnostic.h (output_host_wide_integer): Declare. 2003-06-22 08:05:39 +00:00
dojump.c * dojump.c (do_jump): Copy SUBREGs into a pseudo for comparison. 2003-03-30 23:07:27 +00:00
doloop.c cfgloopanal.c: New file. 2003-01-24 20:27:02 +00:00
dominance.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
doschk.c
dummy-conditions.c c-pch.c, [...]: Replace "GNU CC" with "GCC". 2003-03-13 03:48:31 +00:00
dwarf.h
dwarf2.h alias.c: Fix comment typos. 2003-01-18 02:26:43 +00:00
dwarf2asm.c builtins.c (validate_arglist): Eliminate libiberty VA_ macros, always use stdarg. 2003-05-17 22:21:35 +00:00
dwarf2asm.h ansidecl.h (ATTRIBUTE_NONNULL, [...]): New. 2003-03-17 22:57:27 +00:00
dwarf2out.c * dwarf2out.c (gen_field_die): Return if type of decl is error mark. 2003-06-25 06:10:27 +00:00
dwarf2out.h
dwarfout.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
emit-rtl.c convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
errors.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
errors.h genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
et-forest.c * alias.c (nonlocal_mentioned_p, nonlocal_referenced_p) 2003-05-20 01:49:12 +00:00
et-forest.h et-forest.c: Fix comment typos. 2003-01-17 14:24:24 +00:00
except.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
except.h except.c (EH_RETURN_STACKADJ_RTX): Do not define. 2003-05-10 22:59:04 +00:00
explow.c ChangeLog: Follow spelling conventions. 2003-06-12 19:01:08 +00:00
expmed.c ChangeLog.1: Fix a typo. 2003-06-23 16:11:56 +00:00
expr.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
expr.h decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
final.c hwint.h (HOST_WIDE_INT_PRINT, [...]): New macros. 2003-06-25 19:33:08 +00:00
fix-header.c fix-header.c: Remove ADD_MISSING_EXTERN_C dependend variables. 2003-06-04 06:50:47 +02:00
fixproto fixproto: Define NULL and size_t in generated stdlib.h and unistd.h. 2003-03-22 00:15:53 +00:00
flags.h value-prof.c: New. 2003-06-26 07:52:10 +00:00
flow.c value-prof.c: New. 2003-06-26 07:52:10 +00:00
fold-const.c re PR rtl-optimization/11210 (optimizer drops conditional with typecast from signed to unsigned char) 2003-06-26 10:37:35 +00:00
fp-test.c
function.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
function.h function.h (struct emit_status): Remove x_last_linenum, x_last_filename. 2003-06-16 08:27:05 +00:00
future.options
gbl-ctors.h mklibgcc.in (lib2funcs): Remove _exit. 2003-06-07 20:50:54 +02:00
gcc.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
gcc.h Makefile.in (TREE_H): Replace location.h with input.h. 2003-05-02 11:33:06 +00:00
gccbug.in gccbug.in: Add PCH to list of categories. 2003-06-25 15:08:26 -06:00
gccspec.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
gcov-dump.c re PR bootstrap/10169 (Bootstrap fails on mainline with Tru64 5.1B) 2003-05-29 21:33:35 +00:00
gcov-io.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
gcov-io.h value-prof.c: New. 2003-06-26 07:52:10 +00:00
gcov-iov.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
gcov.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
gcse.c * gcse.c (store_killed_in_insn): Fix. 2003-06-19 22:26:53 +00:00
gdbinit.in * gdbinit.in: Update to reflect new identifier structure. 2003-04-28 21:24:06 +00:00
gen-protos.c gen-protos.c (main): Readd unused attribute for argc. 2003-06-01 20:48:38 +02:00
genattr.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genattrtab.c genattrtab.c (copy_rtx_unchanging): Remove #if 0'ed code. 2003-06-01 18:02:11 +02:00
genattrtab.h genattrtab.h, [...]: Replace "GNU CC" with "GCC". 2003-03-13 03:51:01 +00:00
genautomata.c ChangeLog.1: Fix spelling of "outputting". 2003-06-13 11:36:31 +00:00
gencheck.c builtin-attrs.def, [...]: Don't use macros from "symcat.h", instead rely on ISO C. 2003-06-16 19:14:22 +00:00
gencodes.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genconditions.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genconfig.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genconstants.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genemit.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genextract.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genflags.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
gengenrtl.c builtin-attrs.def, [...]: Don't use macros from "symcat.h", instead rely on ISO C. 2003-06-16 19:14:22 +00:00
gengtype-lex.l gengtype-lex.l (IWORD): Add CHAR_BITFIELD. 2003-04-03 15:42:16 +00:00
gengtype-yacc.y gengtype-yacc.y: Improve portability. 2003-04-29 18:51:38 +00:00
gengtype.c rtl.h: Remove declarations from coverage.h. 2003-06-17 07:09:13 +02:00
gengtype.h genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genmultilib * genmultilib: Use 'cd ./foo'. 2002-12-17 16:17:35 -05:00
genopinit.c optabs.h (enum optab_index): Add new OTI_tan and OTI_atan. 2003-06-16 12:53:16 +00:00
genoutput.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
genpeep.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genpreds.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
genrecog.c ChangeLog.1: Fix a typo. 2003-06-23 16:11:56 +00:00
gensupport.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
gensupport.h genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
ggc-common.c re PR pch/9830 (PCH not working on Solaris) 2003-06-08 06:41:28 +00:00
ggc-none.c ggc.h: Convert to ISO C90 prototypes. 2003-06-07 20:35:35 +02:00
ggc-page.c alloc-pool.c: Don't check HAVE_LONG_DOUBLE. 2003-06-17 14:10:01 +00:00
ggc-simple.c alloc-pool.c: Don't check HAVE_LONG_DOUBLE. 2003-06-17 14:10:01 +00:00
ggc.h ChangeLog: Follow spelling conventions. 2003-06-12 19:01:08 +00:00
glimits.h
global.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
gmon.c
graph.c * alias.c (nonlocal_mentioned_p, nonlocal_referenced_p) 2003-05-20 01:49:12 +00:00
graph.h
gstab.h
gsyms.h
gsyslimits.h
gthr-aix.h
gthr-dce.h Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
gthr-gnat.c gthr-gnat.c: Remove #undef UNUSED. 2003-05-30 00:43:08 +00:00
gthr-gnat.h gthr-gnat.c: Remove #undef UNUSED. 2003-05-30 00:43:08 +00:00
gthr-posix.h Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
gthr-rtems.h re PR bootstrap/9296 ([*-rtems] gthr-rtems regression) 2003-01-29 15:06:59 +00:00
gthr-single.h * gthr-single.h: Fix formatting. 2002-11-15 04:53:19 +00:00
gthr-solaris.h Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
gthr-vxworks.h Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
gthr-win32.h gthr-win32.h (__GTHREAD_HIDE_WIN32API): Test for non-zero value, not just if defined. 2003-05-21 22:16:08 +00:00
gthr.h Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
haifa-sched.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
hard-reg-set.h loop.c (emit_prefetch_instructions): Do conversion at right place in RTL chain. 2003-01-31 23:34:17 +00:00
hashtable.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
hashtable.h hashtable.h (struct ht_identifier): Add data member "hash_value". 2003-05-18 13:40:54 +00:00
hooks.c hooks.c (hook_int_void_no_regs): Rename from hook_reg_class_void_no_regs; change return type. 2003-06-20 10:30:05 -07:00
hooks.h hooks.c (hook_int_void_no_regs): Rename from hook_reg_class_void_no_regs; change return type. 2003-06-20 10:30:05 -07:00
host-default.c Makefile.in (host_hook_obj): New. 2003-02-06 01:47:56 +00:00
hosthooks-def.h genattrtab.h, [...]: Replace "GNU CC" with "GCC". 2003-03-13 03:51:01 +00:00
hosthooks.h genattrtab.h, [...]: Replace "GNU CC" with "GCC". 2003-03-13 03:51:01 +00:00
hwint.h hwint.h (HOST_WIDE_INT_PRINT, [...]): New macros. 2003-06-25 19:33:08 +00:00
ifcvt.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
input.h Makefile.in (TREE_H): Replace location.h with input.h. 2003-05-02 11:33:06 +00:00
insn-addr.h
integrate.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
integrate.h convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
intl.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
intl.h genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
jump.c jump.c (next_nondeleted_insn): Remove. 2003-06-25 03:45:13 +00:00
langhooks-def.h re PR c/10178 (ICE in tree_low_cst) 2003-06-25 17:29:14 +00:00
langhooks.c c4x.c: Don't include "c-tree.h". 2003-06-16 13:41:28 +00:00
langhooks.h re PR c/10178 (ICE in tree_low_cst) 2003-06-25 17:29:14 +00:00
lcm.c c-cppbuiltin.c (builtin_define_with_value_n): Fix whitespace. 2003-03-15 13:43:33 +00:00
libfuncs.h libfuncs.h (LTI_setbits, [...]): New. 2003-04-11 12:45:32 -07:00
libgcc-std.ver except.c: Revert 04-01 and 04-02 forced-unwind changes. 2003-05-07 15:11:38 -07:00
libgcc2.c libgcc2.c: Delete sysV68 L_trampoline section. 2003-06-15 05:47:39 +00:00
libgcc2.h gbl-ctors.h: Add special license exception. 2003-04-22 17:21:04 +00:00
libgcov.c value-prof.c: New. 2003-06-26 07:52:10 +00:00
limitx.h
limity.h
line-map.c * line-map.c, line-map.h: Convert to ISO prototypes. 2003-06-20 05:51:13 +00:00
line-map.h * line-map.c, line-map.h: Convert to ISO prototypes. 2003-06-20 05:51:13 +00:00
lists.c convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
local-alloc.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
longlong.h * longlong.h (umul_ppmm) [alpha]: Use __builtin_alpha_umulh. 2003-04-02 11:33:22 -08:00
loop-init.c Break out coverage routines to new file. 2003-04-21 19:48:10 +00:00
loop-unroll.c cfgloopanal.c (num_loop_insns, [...]): Count only real insns. 2003-05-11 22:54:33 +00:00
loop-unswitch.c basic-block.h (EDGE_IRREDUCIBLE_LOOP, [...]): New. 2003-03-05 22:05:18 +00:00
loop.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
loop.h convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
machmode.def builtin-attrs.def, [...]: Don't use macros from "symcat.h", instead rely on ISO C. 2003-06-16 19:14:22 +00:00
machmode.h convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
main.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
mbchar.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
mbchar.h
mips-tdump.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
mips-tfile.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
mkconfig.sh * mkconfig.sh: Add multiple inclusion guards to generated headers. 2003-06-21 05:20:05 +00:00
mkdeps.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
mkdeps.h cppfiles.c: Clarify comments. 2003-06-25 21:01:10 +00:00
mkheaders.in
mkinstalldirs
mklibgcc.in mklibgcc.in (lib2funcs): Remove _exit. 2003-06-07 20:50:54 +02:00
mkmap-flat.awk
mkmap-symver.awk mkmap-symver.awk (BEGIN): Set sawsymbol false. 2002-11-27 12:00:14 -08:00
move-if-change
optabs.c optabs.h (enum optab_index): Add new OTI_tan and OTI_atan. 2003-06-16 12:53:16 +00:00
optabs.h optabs.h (enum optab_index): Add new OTI_tan and OTI_atan. 2003-06-16 12:53:16 +00:00
opts.c c-opts.c (missing_arg): Make non-static. 2003-06-26 06:05:36 +00:00
opts.h c-opts.c (complain_wrong_lang, [...]): Remove. 2003-06-25 20:43:11 +00:00
opts.sh c-opts.c (complain_wrong_lang, [...]): Remove. 2003-06-25 20:43:11 +00:00
output.h target.h (asm_out.file_start, [...]): New hooks. 2003-06-19 21:47:26 +00:00
params.c genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
params.def Makefile.in (cse.o): Add params.h dependency. 2003-06-04 07:51:41 +00:00
params.h genrecog.c: Use ISO C90 prototypes. 2003-06-01 17:59:10 +02:00
postreload.c postreload.c (reload_cse_simplify_set): Call cselib_lookup earlier. 2003-06-26 13:42:33 +00:00
predict.c predict.h: Convert to ISO C90 prototypes. 2003-06-08 16:21:54 +02:00
predict.def builtins.def: Fix comment formatting. 2002-09-29 13:16:44 +00:00
predict.h predict.h: Convert to ISO C90 prototypes. 2003-06-08 16:21:54 +02:00
prefix.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
prefix.h
pretty-print.h
print-rtl.c convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
print-tree.c convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
profile.c value-prof.c: New. 2003-06-26 07:52:10 +00:00
protoize.c * protoize.c: Fix breakage from last patch. 2003-06-19 12:46:50 +02:00
ra-build.c calls.c: Fix comment formatting. 2003-03-08 01:38:27 +00:00
ra-colorize.c c-cppbuiltin.c (builtin_define_with_value_n): Fix whitespace. 2003-03-15 13:43:33 +00:00
ra-debug.c hwint.h (HOST_WIDE_INT_PRINT, [...]): New macros. 2003-06-25 19:33:08 +00:00
ra-rewrite.c cfgloopanal.c (test_for_iteration): Use string concatentation on HOST_WIDE_INT_PRINT_* format specifier to collapse... 2003-05-17 01:40:45 +00:00
ra.c df.h (enum df_ref_flags.DF_REF_STRIPPED): New. 2003-03-07 22:06:16 +00:00
ra.h df.h (enum df_ref_flags.DF_REF_STRIPPED): New. 2003-03-07 22:06:16 +00:00
read-rtl.c (read_braced_string): Check for EOF. If encountered issue an error message. 2003-06-23 13:57:39 +00:00
real.c real.h (ieee_extended_intel_96_round_53_format): New. 2003-06-25 00:11:33 +00:00
real.h real.h (ieee_extended_intel_96_round_53_format): New. 2003-06-25 00:11:33 +00:00
recog.c genrecog.c (pred_table): Remove the entry for mode_independent_operand. 2003-06-23 11:58:25 +00:00
recog.h genrecog.c (pred_table): Remove the entry for mode_independent_operand. 2003-06-23 11:58:25 +00:00
reg-stack.c i386.md (expsf2, [...]): New patterns to implement exp, expf and expl built-ins as inline x87 intrinsics. 2003-06-15 13:32:31 +00:00
regclass.c combine.c (gen_lowpart_for_combine): Update handling of subregs_of_mode 2003-02-28 10:11:47 +00:00
regmove.c regmove.c (optimize_reg_copy_1): Do not replace a hard register in an asm. 2003-02-22 03:17:24 +00:00
regrename.c regrename.c (struct du_chain): Use a bitfield for reg_class. 2003-04-10 05:24:26 +00:00
regs.h c-tree.h: Remove declaration of poplevel. 2003-06-19 14:25:36 +02:00
reload.c reload.c (can_reload_into): New function. 2003-06-26 21:07:23 +01:00
reload.h Makefile.in (OBJS): Add postreload.o. 2003-06-26 13:37:16 +00:00
reload1.c Makefile.in (OBJS): Add postreload.o. 2003-06-26 13:37:16 +00:00
reorg.c reorg.c (emit_delay_sequence, [...]): Clear insn locators inside delay slots. 2003-06-14 09:14:38 +00:00
resource.c regmove.c: Fix comment typos. 2002-12-24 08:30:34 +00:00
resource.h
rtl-error.c convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
rtl.c combine.c (distribute_notes): Kill REG_EXEC_COUNT. 2003-02-20 08:54:48 +00:00
rtl.def cfglayout.c (insn_scope): New static function 2003-06-08 19:35:54 +00:00
rtl.h jump.c (next_nondeleted_insn): Remove. 2003-06-25 03:45:13 +00:00
rtlanal.c ChangeLog.1: Fix a typo. 2003-06-23 16:11:56 +00:00
sbitmap.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
sbitmap.h sbitmap.c (sbitmap_resize): New function. 2003-02-18 19:35:08 +00:00
scan-decls.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
scan-types.sh
scan.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
scan.h scan.h: Convert to ISO C. 2003-06-16 18:24:08 +00:00
sched-deps.c basic-block.h: Fix comment formatting. 2003-06-23 15:27:37 +00:00
sched-ebb.c sched-ebb.c (schedule_ebb): Supply the correct starting block number to save_line_notes. 2003-05-07 17:18:48 -07:00
sched-int.h sched-int.h (INSN_TRAP_CLASS, [...]): Move them from sched-rgn.c. 2003-02-25 20:40:57 +00:00
sched-rgn.c sched-int.h (INSN_TRAP_CLASS, [...]): Move them from sched-rgn.c. 2003-02-25 20:40:57 +00:00
sched-vis.c Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
sdbout.c dbxout.c (dbxout_source_line_counter): New global variable. 2003-06-17 08:06:58 +00:00
sdbout.h sdbout.h: Use ISO C90 prototypes. 2003-06-01 17:43:59 +02:00
sibcall.c regmove.c: Fix comment typos. 2002-12-24 08:30:34 +00:00
simplify-rtx.c simplify-rtx.c (simplify_subreg): Do not over-extend vector constants. 2003-06-17 00:03:24 +00:00
sort-protos
sreal.c tracer.c: Remove duplication declaration. 2003-06-16 13:42:26 +02:00
sreal.h Makefile.in (sreal.o): Added. 2003-02-10 12:34:24 +00:00
ssa-ccp.c cfgbuild.c (make_edges): Use tablejump_p. 2003-03-30 12:46:57 -08:00
ssa-dce.c ChangeLog.1: Fix a typo. 2003-06-23 16:11:56 +00:00
ssa.c tracer.c: Remove duplication declaration. 2003-06-16 13:42:26 +02:00
ssa.h convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
stab.def builtins.def: Fix comment formatting. 2002-09-29 13:16:44 +00:00
stack.h
stmt.c re PR c/10178 (ICE in tree_low_cst) 2003-06-25 17:29:14 +00:00
stor-layout.c tm.texi (Storage Layout): Remove ROUND_TYPE_SIZE and ROUND_TYPE_SIZE_UNIT. 2003-06-01 21:44:22 +02:00
stringpool.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
sys-protos.h
sys-types.h
system.h target.h (asm_out.file_start, [...]): New hooks. 2003-06-19 21:47:26 +00:00
target-def.h hooks.c (hook_int_void_no_regs): Rename from hook_reg_class_void_no_regs; change return type. 2003-06-20 10:30:05 -07:00
target.h hooks.c (hook_int_void_no_regs): Rename from hook_reg_class_void_no_regs; change return type. 2003-06-20 10:30:05 -07:00
timevar.c timevar.c (get_run_time): Remove function provided also by libiberty. 2003-06-16 22:40:47 +02:00
timevar.def objc-act.c: Include cgraph.h 2003-02-26 11:09:33 +00:00
timevar.h timevar.c (get_run_time): Remove function provided also by libiberty. 2003-06-16 22:40:47 +02:00
tlink.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
toplev.c value-prof.c: New. 2003-06-26 07:52:10 +00:00
toplev.h common.opt: More -f switches. 2003-06-22 13:44:40 +00:00
tracer.c tracer.c: Remove duplication declaration. 2003-06-16 13:42:26 +02:00
tree-dump.c re PR debug/4252 (cc1: Invalid option `-fdump-translation-unit') 2003-06-18 05:58:55 +00:00
tree-dump.h predict.h: Convert to ISO C90 prototypes. 2003-06-08 16:21:54 +02:00
tree-inline.c re PR c++/10888 (inlining failure for allocate in ~vector()) 2003-06-20 19:55:29 +00:00
tree-inline.h genattrtab.h, [...]: Replace "GNU CC" with "GCC". 2003-03-13 03:51:01 +00:00
tree.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
tree.def convert.c, [...]: Replace overly specific references to "GNU C" and "GNU C Compiler" with... 2003-06-16 11:30:25 +00:00
tree.h c-common.c (handle_used_attribute): Use mark_referenced. 2003-06-25 22:14:26 +00:00
tsystem.h tsystem.h (abort): Declare in inhibit_libc case to remove build warnings for addvsi3, et.al. 2003-06-13 21:52:02 +00:00
typeclass.h
unroll.c function.h (struct emit_status): Remove x_last_linenum, x_last_filename. 2003-06-16 08:27:05 +00:00
unwind-c.c unwind-c.c: Define NO_SIZE_OF_ENCODED_VALUE. 2003-06-14 03:08:12 +00:00
unwind-dw2-fde-darwin.c unwind-dw2-fde-darwin.c (DESTRUCTOR_MAY_BE_CALLED_LIVE): New. 2003-04-01 21:02:25 +00:00
unwind-dw2-fde-glibc.c * unwind-dw2-fde-glibc.c (_Unwind_IteratePhdrCallback):Remove usage of 2003-06-04 07:41:31 +02:00
unwind-dw2-fde.c unwind-dw2-fde.c (__register_frame_info_bases): Check for null begin parameter (as well as pointer to null). 2003-04-18 18:43:28 -04:00
unwind-dw2-fde.h ChangeLog (configure.in): Don't include ansidecl.h in tconfig.h. 2003-01-24 01:46:50 +00:00
unwind-dw2.c unwind-dw2.c (uw_init_context_1): Don't pass &outer_cfa directly to _Unwind_SetGRPtr(). 2003-05-13 06:49:46 +00:00
unwind-libunwind.c * unwind-libunwind.c (_Unwind_FindEnclosingFunction): New. 2003-05-07 18:15:40 -07:00
unwind-pe.h unwind-c.c: Define NO_SIZE_OF_ENCODED_VALUE. 2003-06-14 03:08:12 +00:00
unwind-sjlj.c except.c: Revert 04-01 and 04-02 forced-unwind changes. 2003-05-07 15:11:38 -07:00
unwind.h except.c: Revert 04-01 and 04-02 forced-unwind changes. 2003-05-07 15:11:38 -07:00
unwind.inc except.c: Revert 04-01 and 04-02 forced-unwind changes. 2003-05-07 15:11:38 -07:00
value-prof.c value-prof.c: New. 2003-06-26 09:38:34 +00:00
value-prof.h value-prof.c: New. 2003-06-26 09:38:34 +00:00
varasm.c c-common.c (handle_used_attribute): Use mark_referenced. 2003-06-25 22:14:26 +00:00
varray.c decl.c, [...]: Don't use the PTR macro. 2003-06-16 21:41:10 +00:00
varray.h varray.c (element_size): Remove. 2003-02-13 00:41:28 +00:00
version.c Daily bump. 2003-06-26 00:16:07 +00:00
version.h system.h (GCCBUGURL): Delete. 2002-10-08 17:27:39 +00:00
vmsdbg.h
vmsdbgout.c vmsdbgout.c (vmsdbgout_finish): Rename parameter to main_input_filename to avoid conflict with input_filename macro. 2003-06-15 23:36:37 +00:00
xcoffout.c dbxout.c (dbxout_source_line_counter): New global variable. 2003-06-17 08:06:58 +00:00
xcoffout.h target.h (asm_out.file_start, [...]): New hooks. 2003-06-19 21:47:26 +00:00

README.Portability

Copyright (C) 2000, 2003 Free Software Foundation, Inc.

This file is intended to contain a few notes about writing C code
within GCC so that it compiles without error on the full range of
compilers GCC needs to be able to compile on.

The problem is that many ISO-standard constructs are not accepted by
either old or buggy compilers, and we keep getting bitten by them.
This knowledge until know has been sparsely spread around, so I
thought I'd collect it in one useful place.  Please add and correct
any problems as you come across them.

I'm going to start from a base of the ISO C89 standard, since that is
probably what most people code to naturally.  Obviously using
constructs introduced after that is not a good idea.

The first section of this file deals strictly with portability issues,
the second with common coding pitfalls, and the third with obsolete
K+R portability issues.


			Portability Issues
			==================

String literals
---------------

Some SGI compilers choke on the parentheses in:-

const char string[] = ("A string");

This is unfortunate since this is what the GNU gettext macro N_
produces.  You need to find a different way to code it.

Some compilers like MSVC++ have fairly low limits on the maximum
length of a string literal; 509 is the lowest we've come across.  You
may need to break up a long printf statement into many smaller ones.


Empty macro arguments
---------------------

ISO C (6.8.3 in the 1990 standard) specifies the following:

If (before argument substitution) any argument consists of no
preprocessing tokens, the behavior is undefined.

This was relaxed by ISO C99, but some older compilers emit an error,
so code like

#define foo(x, y) x y
foo (bar, )

needs to be coded in some other way.


free and realloc
----------------

Some implementations crash upon attempts to free or realloc the null
pointer.  Thus if mem might be null, you need to write

  if (mem)
    free (mem);


Trigraphs
---------

You weren't going to use them anyway, but some otherwise ISO C
compliant compilers do not accept trigraphs.


Suffixes on Integer Constants
-----------------------------

You should never use a 'l' suffix on integer constants ('L' is fine),
since it can easily be confused with the number '1'.


			Common Coding Pitfalls
			======================

errno
-----

errno might be declared as a macro.


Implicit int
------------

In C, the 'int' keyword can often be omitted from type declarations.
For instance, you can write

  unsigned variable;

as shorthand for

  unsigned int variable;

There are several places where this can cause trouble.  First, suppose
'variable' is a long; then you might think

  (unsigned) variable

would convert it to unsigned long.  It does not.  It converts to
unsigned int.  This mostly causes problems on 64-bit platforms, where
long and int are not the same size.

Second, if you write a function definition with no return type at
all:

  operate (int a, int b)
  {
    ...
  }

that function is expected to return int, *not* void.  GCC will warn
about this.

Implicit function declarations always have return type int.  So if you
correct the above definition to

  void
  operate (int a, int b)
  ...

but operate() is called above its definition, you will get an error
about a "type mismatch with previous implicit declaration".  The cure
is to prototype all functions at the top of the file, or in an
appropriate header.

Char vs unsigned char vs int
----------------------------

In C, unqualified 'char' may be either signed or unsigned; it is the
implementation's choice.  When you are processing 7-bit ASCII, it does
not matter.  But when your program must handle arbitrary binary data,
or fully 8-bit character sets, you have a problem.  The most obvious
issue is if you have a look-up table indexed by characters.

For instance, the character '\341' in ISO Latin 1 is SMALL LETTER A
WITH ACUTE ACCENT.  In the proper locale, isalpha('\341') will be
true.  But if you read '\341' from a file and store it in a plain
char, isalpha(c) may look up character 225, or it may look up
character -31.  And the ctype table has no entry at offset -31, so
your program will crash.  (If you're lucky.)

It is wise to use unsigned char everywhere you possibly can.  This
avoids all these problems.  Unfortunately, the routines in <string.h>
take plain char arguments, so you have to remember to cast them back
and forth - or avoid the use of strxxx() functions, which is probably
a good idea anyway.

Another common mistake is to use either char or unsigned char to
receive the result of getc() or related stdio functions.  They may
return EOF, which is outside the range of values representable by
char.  If you use char, some legal character value may be confused
with EOF, such as '\377' (SMALL LETTER Y WITH UMLAUT, in Latin-1).
The correct choice is int.

A more subtle version of the same mistake might look like this:

  unsigned char pushback[NPUSHBACK];
  int pbidx;
  #define unget(c) (assert(pbidx < NPUSHBACK), pushback[pbidx++] = (c))
  #define get(c) (pbidx ? pushback[--pbidx] : getchar())
  ...
  unget(EOF);

which will mysteriously turn a pushed-back EOF into a SMALL LETTER Y
WITH UMLAUT.


Other common pitfalls
---------------------

o Expecting 'plain' char to be either sign or unsigned extending

o Shifting an item by a negative amount or by greater than or equal to
  the number of bits in a type (expecting shifts by 32 to be sensible
  has caused quite a number of bugs at least in the early days).

o Expecting ints shifted right to be sign extended.

o Modifying the same value twice within one sequence point.

o Host vs. target floating point representation, including emitting NaNs
  and Infinities in a form that the assembler handles.

o qsort being an unstable sort function (unstable in the sense that
  multiple items that sort the same may be sorted in different orders
  by different qsort functions).

o Passing incorrect types to fprintf and friends.

o Adding a function declaration for a module declared in another file to
  a .c file instead of to a .h file.


			K+R Portability Issues
			======================

Unary +
-------

K+R C compilers and preprocessors have no notion of unary '+'.  Thus
the following code snippet contained 2 portability problems.

int x = +2;  /* int x = 2;  */
#if +1       /* #if 1  */
#endif


Pointers to void
----------------

K+R C compilers did not have a void pointer, and used char * as the
pointer to anything.  The macro PTR is defined as either void * or
char * depending on whether you have a standards compliant compiler or
a K+R one.  Thus

  free ((void *) h->value.expansion);

should have been written

  free ((PTR) h->value.expansion);

Further, an initial investigation indicates that pointers to functions
returning void were okay.  Thus the example given by "Calling
functions through pointers to functions" below appeared not to cause a
problem.


String literals
---------------

K+R C did not allow concatenation of string literals like

  "This is a " "single string literal".


signed keyword
--------------

The signed keyword did not exist in K+R compilers; it was introduced
in ISO C89, so you could not use it.  In both K+R and standard C,
unqualified char and bitfields may be signed or unsigned.  There is no
way to portably declare signed chars or signed bitfields.

All other arithmetic types are signed unless you use the 'unsigned'
qualifier.  For instance, it was safe to write

  short paramc;

instead of

  signed short paramc;

If you have an algorithm that depends on signed char or signed
bitfields, you had to find another way to write it before it could be
integrated into GCC.


Function prototypes
-------------------

You need to provide a function prototype for every function before you
use it, and functions had to be defined K+R style.  The function
prototype should have used the PARAMS macro, which takes a single
argument.  Therefore the parameter list had to be enclosed in
parentheses.  For example,

int myfunc PARAMS ((double, int *));

int
myfunc (var1, var2)
     double var1;
     int *var2;
{
  ...
}

This implies that if the function takes no arguments, it had to be
declared and defined as follows:

int myfunc PARAMS ((void));

int
myfunc ()
{
  ...
}

You also had to use PARAMS when referring to function protypes in
other circumstances, for example see "Calling functions through
pointers to functions" below.

Variable-argument functions are best described by example:-

void cpp_ice PARAMS ((cpp_reader *, const char *msgid, ...));

void
cpp_ice VPARAMS ((cpp_reader *pfile, const char *msgid, ...))
{
  VA_OPEN (ap, msgid);
  VA_FIXEDARG (ap, cpp_reader *, pfile);
  VA_FIXEDARG (ap, const char *, msgid);

  ...
  VA_CLOSE (ap);
}

See ansidecl.h for the definitions of the above macros and more.

One aspect of using K+R style function declarations, is you could not
have arguments whose types are char, short, or float, since without
prototypes (ie, K+R rules), these types are promoted to int, int, and
double respectively.

Calling functions through pointers to functions
-----------------------------------------------

K+R C compilers require parentheses around the dereferenced function
pointer expression in the call, whereas ISO C relaxes the syntax.  For
example

typedef void (* cl_directive_handler) PARAMS ((cpp_reader *, const char *));
      *p->handler (pfile, p->arg);

had to become

      (*p->handler) (pfile, p->arg);


Macros
------

The rules under K+R C and ISO C for achieving stringification and
token pasting are quite different.  Therefore some macros have been
defined which will get it right depending upon the compiler.

  CONCAT2(a,b) CONCAT3(a,b,c) and CONCAT4(a,b,c,d)

will paste the tokens passed as arguments.  You must not leave any
space around the commas.  Also,

  STRINGX(x)

will stringify an argument; to get the same result on K+R and ISO
compilers x should not have spaces around it.


Passing structures by value
---------------------------

You had to avoid passing structures by value, either to or from
functions.  It seems some K+R compilers handle this differently or not
at all.


Enums
-----

In K+R C, you had to cast enum types to use them as integers, and some
compilers in particular give lots of warnings for using an enum as an
array index.


Bitfields
---------

See also "signed keyword" above.  In K+R C only unsigned int bitfields
were defined (i.e. unsigned char, unsigned short, unsigned long.
Using plain int/short/long was not allowed).


Reserved Keywords
-----------------

K+R C has "entry" as a reserved keyword, so you had to not use it for
your variable names.


Type promotions
---------------

K+R used unsigned-preserving rules for arithmetic expresssions, while
ISO uses value-preserving.  This means an unsigned char compared to an
int is done as an unsigned comparison in K+R (since unsigned char
promotes to unsigned) while it is signed in ISO (since all of the
values in unsigned char fit in an int, it promotes to int).


Suffixes on Integer Constants
-----------------------------

K+R C did not accept a 'u' suffix on integer constants.  If you wanted
to declare a constant to be be unsigned, you had to use an explicit
cast.