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| author | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-04-17 12:58:07 +0000 |
|---|---|---|
| committer | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-04-17 12:58:07 +0000 |
| commit | 4b5fb32aba30762e0d8c9e75d1b46b47bee5eeb4 (patch) | |
| tree | 65719a14085bffae4c5e478b099f6bf4f54ba60d /libgcc/config/i386 | |
| parent | f8544110b0437273fe6b667d8f793afd69de7aeb (diff) | |
| download | gcc-4b5fb32aba30762e0d8c9e75d1b46b47bee5eeb4.tar.gz | |
Hide __cpu_indicator_init/__cpu_model from linker
We shouldn't call external function, __cpu_indicator_init, while an object
is being relocated since its .got.plt section hasn't been updated. It
works for non-PIE since no update on .got.plt section is required. This
patch creates libgcc.so as a linker script, hides __cpu_indicator_init
and __cpu_model in libgcc.so.1 from linker, forces linker to resolve
__cpu_indicator_init and __cpu_model to their hidden definitions in
libgcc.a while providing backward binary compatibility.
gcc/testsuite/
PR target/65612
* g++.dg/ext/mv18.C: New test.
* g++.dg/ext/mv19.C: Likewise.
* g++.dg/ext/mv20.C: Likewise.
* g++.dg/ext/mv21.C: Likewise.
* g++.dg/ext/mv22.C: Likewise.
* g++.dg/ext/mv23.C: Likewise.
libgcc/
PR target/65612
* config.host (tmake_file): Add t-slibgcc-libgcc for Linux/x86.
* config/i386/cpuinfo.c (__cpu_model): Initialize.
(__cpu_indicator_init@GCC_4.8.0): New.
(__cpu_model@GCC_4.8.0): Likewise.
* config/i386/t-linux (HOST_LIBGCC2_CFLAGS): Add
-DUSE_ELF_SYMVER.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@222178 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgcc/config/i386')
| -rw-r--r-- | libgcc/config/i386/cpuinfo.c | 7 | ||||
| -rw-r--r-- | libgcc/config/i386/t-linux | 2 |
2 files changed, 7 insertions, 2 deletions
diff --git a/libgcc/config/i386/cpuinfo.c b/libgcc/config/i386/cpuinfo.c index eaf2f100d59..f6f91ddce6a 100644 --- a/libgcc/config/i386/cpuinfo.c +++ b/libgcc/config/i386/cpuinfo.c @@ -109,7 +109,7 @@ struct __processor_model unsigned int __cpu_type; unsigned int __cpu_subtype; unsigned int __cpu_features[1]; -} __cpu_model; +} __cpu_model = { }; /* Get the specific type of AMD CPU. */ @@ -424,3 +424,8 @@ __cpu_indicator_init (void) return 0; } + +#if defined SHARED && defined USE_ELF_SYMVER +__asm__ (".symver __cpu_indicator_init, __cpu_indicator_init@GCC_4.8.0"); +__asm__ (".symver __cpu_model, __cpu_model@GCC_4.8.0"); +#endif diff --git a/libgcc/config/i386/t-linux b/libgcc/config/i386/t-linux index 4f47f7bfa59..11bb46e0ee4 100644 --- a/libgcc/config/i386/t-linux +++ b/libgcc/config/i386/t-linux @@ -3,4 +3,4 @@ # t-slibgcc-elf-ver and t-linux SHLIB_MAPFILES = libgcc-std.ver $(srcdir)/config/i386/libgcc-glibc.ver -HOST_LIBGCC2_CFLAGS += -mlong-double-80 +HOST_LIBGCC2_CFLAGS += -mlong-double-80 -DUSE_ELF_SYMVER |