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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2019-02-27 22:35:10 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2019-02-27 22:35:10 +0000 |
| commit | cba8a572c208078c1c6eb9845b54f960526c53c0 (patch) | |
| tree | 2533982aacf337307ee72ee82ae77f3cb01fbd58 /libgo/configure.ac | |
| parent | e6df04c105464436e700013e1f665ebf0f94c9f2 (diff) | |
| download | gcc-cba8a572c208078c1c6eb9845b54f960526c53c0.zip gcc-cba8a572c208078c1c6eb9845b54f960526c53c0.tar.gz gcc-cba8a572c208078c1c6eb9845b54f960526c53c0.tar.bz2 | |
re PR go/89172 (FAIL: runtime/pprof)
PR go/89172
internal/cpu, runtime, runtime/pprof: handle function descriptors
When using PPC64 ELF ABI v1 a function address is not a PC, but is the
address of a function descriptor. The first field in the function
descriptor is the actual PC (see
http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#FUNC-DES).
The libbacktrace library knows about this, and libgo uses actual PC
values consistently except for the helper function funcPC that appears
in both runtime and runtime/pprof.
This patch fixes funcPC by recording, in the internal/cpu package,
whether function descriptors are being used. We have to check for
function descriptors using a C compiler check, because GCC can be
configured using --with-abi to select the ELF ABI to use.
Fixes https://gcc.gnu.org/PR89172
Reviewed-on: https://go-review.googlesource.com/c/162978
From-SVN: r269266
Diffstat (limited to 'libgo/configure.ac')
| -rw-r--r-- | libgo/configure.ac | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/libgo/configure.ac b/libgo/configure.ac index 44b5948..03c07fe 100644 --- a/libgo/configure.ac +++ b/libgo/configure.ac @@ -353,6 +353,20 @@ AC_SUBST(GOARCH) AC_SUBST(ALLGOARCH) AC_SUBST(ALLGOARCHFAMILY) +FUNCTION_DESCRIPTORS=false +case ${host} in + rs6000*-*-* | powerpc*-*-*) + AC_COMPILE_IFELSE([AC_LANG_SOURCE([ +#if _CALL_ELF == 1 +#error descriptors +#endif +])], + [FUNCTION_DESCRIPTORS=false], + [FUNCTION_DESCRIPTORS=true]) + ;; +esac +AC_SUBST(FUNCTION_DESCRIPTORS) + dnl Some files are only present when needed for specific architectures. GO_LIBCALL_OS_FILE= GO_LIBCALL_OS_ARCH_FILE= |