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Don't convert memory load to immediate load on __start_SECNAME and
__stop_SECNAME for --gc-sections -z start-stop-gc if all SECNAME
sections been garbage collected.
bfd/
PR ld/27491
* elf32-i386.c (elf_i386_convert_load_reloc): Skip __start_SECNAME
and __stop_SECNAME for --gc-sections -z start-stop-gc if the input
section been garbage collected.
* elf64-x86-64.c (elf_x86_64_convert_load_reloc): Likewise.
* elfxx-x86.h (elf_x86_start_stop_gc_p): New function.
ld/
PR ld/27491
* testsuite/ld-i386/i386.exp: Run PR ld/27491 tests.
* testsuite/ld-x86-64/x86-64.exp: Likewise.
* testsuite/ld-i386/pr27491-1.s: New file.
* testsuite/ld-i386/pr27491-1a.d: Likewise.
* testsuite/ld-i386/pr27491-1b.d: Likewise.
* testsuite/ld-i386/pr27491-1c.d: Likewise.
* testsuite/ld-i386/pr27491-2.d: Likewise.
* testsuite/ld-i386/pr27491-2.s: Likewise.
* testsuite/ld-i386/pr27491-3.d: Likewise.
* testsuite/ld-i386/pr27491-3.s: Likewise.
* testsuite/ld-i386/pr27491-4.d: Likewise.
* testsuite/ld-i386/pr27491-4a.s: Likewise.
* testsuite/ld-i386/pr27491-4b.s: Likewise.
* testsuite/ld-x86-64/pr27491-1.s: Likewise.
* testsuite/ld-x86-64/pr27491-1a.d: Likewise.
* testsuite/ld-x86-64/pr27491-1b.d: Likewise.
* testsuite/ld-x86-64/pr27491-1c.d: Likewise.
* testsuite/ld-x86-64/pr27491-2.d: Likewise.
* testsuite/ld-x86-64/pr27491-2.s: Likewise.
* testsuite/ld-x86-64/pr27491-3.d: Likewise.
* testsuite/ld-x86-64/pr27491-3.s: Likewise.
* testsuite/ld-x86-64/pr27491-4.d: Likewise.
* testsuite/ld-x86-64/pr27491-4a.s: Likewise.
* testsuite/ld-x86-64/pr27491-4b.s: Likewise.
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