ld:
2008-01-11 Tristan Gingold <gingold@adacore.com> Eric Botcazou <ebotcazou@adacore.com> * ldlang.c (lang_end): Warns if the entry point is not found when --gc-sections. Emit an error if no root is specified when --gc-sections -r. * ld.texinfo (Options): Document that --gc-sections is compatible with -r and -q. * ldmain.c (main): Do not error out if -r and --gc-sections. * scripttempl/elf.sc: Emit ENTRY command only if relocating. ld/testsuite: 2008-01-11 Tristan Gingold <gingold@adacore.com> * lib/ld-lib.exp (check_gc_sections_available): Now available on VxWorks. * ld-gc: New directory for testing --gc-sections. * ld-gc/gc.c: New file. * ld-gc/gc.exp: New file. * ld-gc/noent.s: New file. * ld-gc/noent.d: New file.
This commit is contained in:
Tristan Gingold
parent
7dda2462a7
commit
ac69cbc672
11
ld/ChangeLog
11
ld/ChangeLog
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@ -1,3 +1,14 @@
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2008-01-11 Tristan Gingold <gingold@adacore.com>
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Eric Botcazou <ebotcazou@adacore.com>
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* ldlang.c (lang_end): Warns if the entry point is not found when
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--gc-sections.
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Emit an error if no root is specified when --gc-sections -r.
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* ld.texinfo (Options): Document that --gc-sections is compatible
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with -r and -q.
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* ldmain.c (main): Do not error out if -r and --gc-sections.
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* scripttempl/elf.sc: Emit ENTRY command only if relocating.
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2008-01-10 Daniel Jacobowitz <drow@sources.redhat.com>
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PR ld/5533
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@ -8,7 +8,9 @@ source_em()
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}
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fragment()
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{
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local lineno=$[${BASH_LINENO[0]} + 1]
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echo >> e${EMULATION_NAME}.c "#line $lineno \"$em_script\""
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if [ ${BASH_VERSINFO[3]} -ge 3 ]; then
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local lineno=$[${BASH_LINENO[0]} + 1]
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echo >> e${EMULATION_NAME}.c "#line $lineno \"$em_script\""
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fi
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cat >> e${EMULATION_NAME}.c
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}
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@ -1280,8 +1280,7 @@ it ends in a @code{.exe} suffix.
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@item --gc-sections
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@itemx --no-gc-sections
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Enable garbage collection of unused input sections. It is ignored on
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targets that do not support this option. This option is not compatible
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with @samp{-r} or @samp{--emit-relocs}. The default behaviour (of not
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targets that do not support this option. The default behaviour (of not
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performing this garbage collection) can be restored by specifying
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@samp{--no-gc-sections} on the command line.
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@ -1295,6 +1294,11 @@ referenced. Once this initial set of sections has been determined,
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the linker recursively marks as used any section referenced by their
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relocations. See @samp{--entry} and @samp{--undefined}.
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This option can be set when doing a partial link (enabled with option
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@samp{-r}). In this case the root of symbols kept must be explicitely
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specified either by an @samp{--entry} or @samp{--undefined} option or by
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a @code{ENTRY} command in the linker script.
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@kindex --print-gc-sections
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@kindex --no-print-gc-sections
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@cindex garbage collection
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11
ld/ldlang.c
11
ld/ldlang.c
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@ -5077,11 +5077,20 @@ lang_end (void)
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struct bfd_link_hash_entry *h;
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bfd_boolean warn;
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if (link_info.relocatable || link_info.shared)
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if ((link_info.relocatable && !link_info.gc_sections)
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|| link_info.shared)
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warn = entry_from_cmdline;
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else
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warn = TRUE;
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/* Force the user to specify a root when generating a relocatable with
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--gc-sections. */
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if (link_info.gc_sections && link_info.relocatable
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&& (entry_symbol.name == NULL
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&& ldlang_undef_chain_list_head == NULL))
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einfo (_("%P%F: gc-sections requires either an entry or "
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"an undefined symbol\n"));
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if (entry_symbol.name == NULL)
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{
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/* No entry has been specified. Look for the default entry, but
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@ -292,9 +292,7 @@ main (int argc, char **argv)
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if (link_info.relocatable)
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{
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if (link_info.gc_sections)
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einfo ("%P%F: --gc-sections and -r may not be used together\n");
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else if (command_line.relax)
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if (command_line.relax)
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einfo (_("%P%F: --relax and -r may not be used together\n"));
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if (link_info.shared)
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einfo (_("%P%F: -r and -shared may not be used together\n"));
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@ -250,7 +250,7 @@ cat <<EOF
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OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
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"${LITTLE_OUTPUT_FORMAT}")
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OUTPUT_ARCH(${OUTPUT_ARCH})
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ENTRY(${ENTRY})
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${RELOCATING+ENTRY(${ENTRY})}
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${RELOCATING+${LIB_SEARCH_DIRS}}
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${RELOCATING+${EXECUTABLE_SYMBOLS}}
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@ -1,3 +1,13 @@
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2008-01-10 Tristan Gingold <gingold@adacore.com>
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* lib/ld-lib.exp (check_gc_sections_available): Now available on
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VxWorks.
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* ld-gc: New directory for testing --gc-sections.
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* ld-gc/gc.c: New file.
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* ld-gc/gc.exp: New file.
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* ld-gc/noent.s: New file.
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* ld-gc/noent.d: New file.
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2008-01-09 Richard Sandiford <rsandifo@nildram.co.uk>
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PR ld/5526
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@ -0,0 +1,20 @@
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int unused_var = 7;
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int used_var = 7;
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int
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unused_func (int v)
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{
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return 3 * unused_var;
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}
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int
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used_func (int v)
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{
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return 2 * used_var;
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}
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int
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main (void)
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{
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return used_func (5);
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}
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@ -0,0 +1,71 @@
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# Expect script for ld-gc tests
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# Copyright 2008
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# Free Software Foundation, Inc.
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#
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# This file is part of the GNU Binutils.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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# These tests require --gc-sections
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if ![check_gc_sections_available] {
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return
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}
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set cflags "-ffunction-sections -fdata-sections"
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set objfile "tmpdir/gc.o"
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ld_compile "$CC -c $CFLAGS $cflags" $srcdir/$subdir/gc.c $objfile
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proc test_gc { testname filename linker ldflags} {
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global nm
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global srcdir
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global subdir
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global nm_output
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global objfile
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set outfile "tmpdir/$filename"
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if ![ld_simple_link $linker $outfile "-L$srcdir/$subdir $ldflags $objfile"] {
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fail $testname
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return
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}
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if ![ld_nm $nm "" $outfile] {
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unresolved $testname
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return
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}
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if {![info exists nm_output(used_func)] \
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|| ![info exists nm_output(used_var)]} {
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send_log "used sections do not exist\n"
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verbose "used sections do not exist"
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fail $testname
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return
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}
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if {[info exists nm_output(unused_func)] \
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|| [info exists nm_output(unused_var)]} {
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send_log "unused section still here\n"
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verbose "unused section still here"
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fail $testname
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return
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}
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pass $testname
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}
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test_gc "Check --gc-section" "gcexe" $ld "--gc-sections -e main"
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test_gc "Check --gc-section/-q" "gcrexe" $ld "--gc-sections -q -e main"
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test_gc "Check --gc-section/-r/-e" "gcrel" $ld "-r --gc-sections -e main"
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test_gc "Check --gc-section/-r/-u" "gcrel" $ld "-r --gc-sections -u used_func"
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run_dump_test "noent"
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@ -0,0 +1,3 @@
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# name: --gc-sections -r without -e
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# ld: --gc-sections -r
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# error: gc-sections requires either an entry or an undefined symbol
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@ -0,0 +1,4 @@
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.text
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.globl entry
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entry:
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.long 0
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@ -1559,14 +1559,6 @@ proc check_gc_sections_available { } {
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return 0
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}
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# VxWorks kernel modules are relocatable objects linked with -r,
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# while RTP executables are linked with -q (--emit-relocs).
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# Both of these options are incompatible with --gc-sections.
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if { [istarget *-*-vxworks*] } {
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set gc_sections_available_saved 0
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return 0
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}
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# Check if the ld used by gcc supports --gc-sections.
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set ld_output [remote_exec host $ld "--help"]
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if { [ string first "--gc-sections" $ld_output ] >= 0 } {
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