configure: Default to CPP="$CC -E" unless overridden.
This commit is contained in:
Thomas Schwinge
parent
a0b1cd8869
commit
bb931195fe
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@ -1,3 +1,8 @@
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2013-01-25 Thomas Schwinge <thomas@codesourcery.com>
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* configure.in (AC_PROG_CPP): New definition.
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* configure: Regenerate.
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2013-01-23 Joseph Myers <joseph@codesourcery.com>
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* debug/tst-backtrace.h: New file.
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@ -1573,43 +1573,6 @@ fi
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} # ac_fn_c_try_compile
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# ac_fn_c_try_cpp LINENO
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# ----------------------
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# Try to preprocess conftest.$ac_ext, and return whether this succeeded.
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ac_fn_c_try_cpp ()
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{
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as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
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if { { ac_try="$ac_cpp conftest.$ac_ext"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
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$as_echo "$ac_try_echo"; } >&5
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(eval "$ac_cpp conftest.$ac_ext") 2>conftest.err
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ac_status=$?
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if test -s conftest.err; then
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grep -v '^ *+' conftest.err >conftest.er1
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cat conftest.er1 >&5
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mv -f conftest.er1 conftest.err
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fi
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; } > conftest.i && {
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test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
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test ! -s conftest.err
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}; then :
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ac_retval=0
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else
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$as_echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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ac_retval=1
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fi
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eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
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as_fn_set_status $ac_retval
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} # ac_fn_c_try_cpp
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# ac_fn_cxx_try_compile LINENO
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# ----------------------------
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# Try to compile conftest.$ac_ext, and return whether this succeeded.
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@ -2359,6 +2322,11 @@ _ACEOF
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# Glibc should not depend on any header files
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# We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
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# here to work around the Autoconf issue discussed in
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# <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
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# AC_PROG_CPP
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subdirs="$subdirs "
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@ -3073,142 +3041,13 @@ done
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fi
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ac_ext=c
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ac_cpp='$CPP $CPPFLAGS'
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ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_c_compiler_gnu
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking how to run the C preprocessor" >&5
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$as_echo_n "checking how to run the C preprocessor... " >&6; }
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# On Suns, sometimes $CPP names a directory.
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if test -n "$CPP" && test -d "$CPP"; then
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CPP=
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fi
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if test -z "$CPP"; then
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if ${ac_cv_prog_CPP+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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# Double quotes because CPP needs to be expanded
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for CPP in "$CC -E" "$CC -E -traditional-cpp" "/lib/cpp"
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do
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ac_preproc_ok=false
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for ac_c_preproc_warn_flag in '' yes
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do
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# Use a header file that comes with gcc, so configuring glibc
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# with a fresh cross-compiler works.
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# Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
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# <limits.h> exists even on freestanding compilers.
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# On the NeXT, cc -E runs the code through the compiler's parser,
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# not just through cpp. "Syntax error" is here to catch this case.
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#ifdef __STDC__
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# include <limits.h>
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#else
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# include <assert.h>
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#endif
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Syntax error
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_ACEOF
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if ac_fn_c_try_cpp "$LINENO"; then :
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else
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# Broken: fails on valid input.
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continue
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CPP="$CC -E"
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fi
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rm -f conftest.err conftest.i conftest.$ac_ext
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# OK, works on sane cases. Now check whether nonexistent headers
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# can be detected and how.
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#include <ac_nonexistent.h>
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_ACEOF
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if ac_fn_c_try_cpp "$LINENO"; then :
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# Broken: success on invalid input.
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continue
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else
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# Passes both tests.
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ac_preproc_ok=:
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break
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fi
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rm -f conftest.err conftest.i conftest.$ac_ext
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done
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# Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
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rm -f conftest.i conftest.err conftest.$ac_ext
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if $ac_preproc_ok; then :
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break
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fi
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done
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ac_cv_prog_CPP=$CPP
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fi
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CPP=$ac_cv_prog_CPP
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else
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ac_cv_prog_CPP=$CPP
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $CPP" >&5
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$as_echo "$CPP" >&6; }
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ac_preproc_ok=false
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for ac_c_preproc_warn_flag in '' yes
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do
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# Use a header file that comes with gcc, so configuring glibc
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# with a fresh cross-compiler works.
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# Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
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# <limits.h> exists even on freestanding compilers.
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# On the NeXT, cc -E runs the code through the compiler's parser,
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# not just through cpp. "Syntax error" is here to catch this case.
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#ifdef __STDC__
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# include <limits.h>
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#else
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# include <assert.h>
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#endif
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Syntax error
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_ACEOF
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if ac_fn_c_try_cpp "$LINENO"; then :
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else
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# Broken: fails on valid input.
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continue
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fi
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rm -f conftest.err conftest.i conftest.$ac_ext
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# OK, works on sane cases. Now check whether nonexistent headers
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# can be detected and how.
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#include <ac_nonexistent.h>
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_ACEOF
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if ac_fn_c_try_cpp "$LINENO"; then :
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# Broken: success on invalid input.
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continue
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else
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# Passes both tests.
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ac_preproc_ok=:
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break
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fi
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rm -f conftest.err conftest.i conftest.$ac_ext
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done
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# Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
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rm -f conftest.i conftest.err conftest.$ac_ext
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if $ac_preproc_ok; then :
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else
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{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
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$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
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as_fn_error $? "C preprocessor \"$CPP\" fails sanity check
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See \`config.log' for more details" "$LINENO" 5; }
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fi
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ac_ext=c
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ac_cpp='$CPP $CPPFLAGS'
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ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_c_compiler_gnu
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# We need the C++ compiler only for testing.
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ac_ext=cpp
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17
configure.in
17
configure.in
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@ -17,6 +17,23 @@ AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
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[m4_divert_text([DEFAULTS],
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[ac_includes_default='/* none */'])])
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# We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
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# here to work around the Autoconf issue discussed in
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# <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
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AC_DEFUN([AC_PROG_CPP],
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[AC_REQUIRE([AC_PROG_CC])dnl
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AC_ARG_VAR([CPP], [C preprocessor])dnl
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_AC_ARG_VAR_CPPFLAGS()dnl
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# On Suns, sometimes $CPP names a directory.
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if test -n "$CPP" && test -d "$CPP"; then
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CPP=
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fi
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if test -z "$CPP"; then
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CPP="$CC -E"
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fi
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AC_SUBST(CPP)dnl
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])# AC_PROG_CPP
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dnl This is here so we can set $subdirs directly based on configure fragments.
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AC_CONFIG_SUBDIRS()
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