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