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Add support for disabling automatic generation of .eh_frame_hdr sections in ELF based linkers.

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PR ld/20537
	* emultempl/elf32.em: More OPTION_xxx values into an enum.  Add
	OPTION_NO_EH_FRAME_HDR.
	(_add_options): Add support for --no-eh-frame-hdr.
	* ld.texinfo: Document new option.
	* lexsup.c (elf_shlib_list_options): List new option.
	* NEWS: Mention the new option.
This commit is contained in:
Nick Clifton 2016-09-14 10:42:10 +01:00
parent d68ff01f17
commit 29063f8bfb
5 changed files with 38 additions and 11 deletions
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10
ld/ChangeLog
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@ -1,3 +1,13 @@
2016-09-14 Nick Clifton <nickc@redhat.com>
PR ld/20537
* emultempl/elf32.em: More OPTION_xxx values into an enum. Add
OPTION_NO_EH_FRAME_HDR.
(_add_options): Add support for --no-eh-frame-hdr.
* ld.texinfo: Document new option.
* lexsup.c (elf_shlib_list_options): List new option.
* NEWS: Mention the new option.
2016-09-06 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20550

3
ld/NEWS
View File

@ -2,6 +2,9 @@
Changes in 2.28:
* The command line option --no-eh-frame-hdr can now be used in ELF based
linkers to disable the automatic generation of .eh_frame_hdr sections.
* Add --in-implib=<infile> to the ARM linker to enable specifying a set of
Secure Gateway veneers that must exist in the output import library specified
by --out-implib=<outfile> and the address they must have. As such,

27
ld/emultempl/elf32.em
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@ -2199,15 +2199,19 @@ fi
fragment <<EOF
#define OPTION_DISABLE_NEW_DTAGS (400)
#define OPTION_ENABLE_NEW_DTAGS (OPTION_DISABLE_NEW_DTAGS + 1)
#define OPTION_GROUP (OPTION_ENABLE_NEW_DTAGS + 1)
#define OPTION_EH_FRAME_HDR (OPTION_GROUP + 1)
#define OPTION_EXCLUDE_LIBS (OPTION_EH_FRAME_HDR + 1)
#define OPTION_HASH_STYLE (OPTION_EXCLUDE_LIBS + 1)
#define OPTION_BUILD_ID (OPTION_HASH_STYLE + 1)
#define OPTION_AUDIT (OPTION_BUILD_ID + 1)
#define OPTION_COMPRESS_DEBUG (OPTION_AUDIT + 1)
enum elf_options
{
OPTION_DISABLE_NEW_DTAGS = 400,
OPTION_ENABLE_NEW_DTAGS,
OPTION_GROUP,
OPTION_EH_FRAME_HDR,
OPTION_NO_EH_FRAME_HDR,
OPTION_EXCLUDE_LIBS,
OPTION_HASH_STYLE,
OPTION_BUILD_ID,
OPTION_AUDIT,
OPTION_COMPRESS_DEBUG
};
static void
gld${EMULATION_NAME}_add_options
@ -2243,6 +2247,7 @@ fragment <<EOF
{"disable-new-dtags", no_argument, NULL, OPTION_DISABLE_NEW_DTAGS},
{"enable-new-dtags", no_argument, NULL, OPTION_ENABLE_NEW_DTAGS},
{"eh-frame-hdr", no_argument, NULL, OPTION_EH_FRAME_HDR},
{"no-eh-frame-hdr", no_argument, NULL, OPTION_NO_EH_FRAME_HDR},
{"exclude-libs", required_argument, NULL, OPTION_EXCLUDE_LIBS},
{"hash-style", required_argument, NULL, OPTION_HASH_STYLE},
EOF
@ -2322,6 +2327,10 @@ fragment <<EOF
link_info.eh_frame_hdr_type = DWARF2_EH_HDR;
break;
case OPTION_NO_EH_FRAME_HDR:
link_info.eh_frame_hdr_type = 0;
break;
case OPTION_GROUP:
link_info.flags_1 |= (bfd_vma) DF_1_GROUP;
/* Groups must be self-contained. */

7
ld/ld.texinfo
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@ -2270,9 +2270,12 @@ file as @code{__wrap_malloc}; if you do, the assembler may resolve the
call before the linker has a chance to wrap it to @code{malloc}.
@kindex --eh-frame-hdr
@kindex --no-eh-frame-hdr
@item --eh-frame-hdr
Request creation of @code{.eh_frame_hdr} section and ELF
@code{PT_GNU_EH_FRAME} segment header.
@itemx --no-eh-frame-hdr
Request (@option{--eh-frame-hdr}) or suppress
(@option{--no-eh-frame-hdr}) the creation of @code{.eh_frame_hdr}
section and ELF @code{PT_GNU_EH_FRAME} segment header.
@kindex --ld-generated-unwind-info
@item --no-ld-generated-unwind-info

2
ld/lexsup.c
View File

@ -1724,6 +1724,8 @@ elf_shlib_list_options (FILE *file)
fprintf (file, _("\
--eh-frame-hdr Create .eh_frame_hdr section\n"));
fprintf (file, _("\
--no-eh-frame-hdr Do not create .eh_frame_hdr section\n"));
fprintf (file, _("\
--exclude-libs=LIBS Make all symbols in LIBS hidden\n"));
fprintf (file, _("\
--hash-style=STYLE Set hash style to sysv, gnu or both\n"));