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[CMake] Pass -march=i686 when targeting i686 (PR24222) 

Clang will not define __i686__, even when the target triple is i686,
without -march=i686.

With this patch, the compiler-rt build will successfully detect that
Clang can target i686.

The open_memstream.cc test is a little funny. Before my patch, it
was invoked with "-m32 -m64". To make it work after my -march
change, I had to add '-march=x86-64'.

Differential Revision: http://reviews.llvm.org/D11618

llvm-svn: 243604
This commit is contained in:
Hans Wennborg 2015-07-30 01:45:17 +00:00
parent 0e776a2250
commit 78bea23be0
2 changed files with 4 additions and 3 deletions
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3
compiler-rt/cmake/config-ix.cmake
View File

@ -180,7 +180,8 @@ else()
# FIXME: We build runtimes for both i686 and i386, as "clang -m32" may
# target different variant than "$CMAKE_C_COMPILER -m32". This part should
# be gone after we resolve PR14109.
test_target_arch(i686 __i686__ "-m32")
# Use -march to make sure Clang defines __i686__; see PR24222.
test_target_arch(i686 __i686__ "-m32" "-march=i686")
test_target_arch(i386 __i386__ "-m32")
else()
if (CMAKE_SIZEOF_VOID_P EQUAL 4)

4
compiler-rt/test/sanitizer_common/TestCases/Linux/open_memstream.cc
View File

@ -1,5 +1,5 @@
// RUN: %clangxx -m64 -O0 -g -xc++ %s -o %t && %run %t
// RUN: %clangxx -m64 -O3 -g -xc++ %s -o %t && %run %t
// RUN: %clangxx -m64 -march=x86-64 -O0 -g -xc++ %s -o %t && %run %t
// RUN: %clangxx -m64 -march=x86-64 -O3 -g -xc++ %s -o %t && %run %t
// REQUIRES: x86_64-supported-target
#include <assert.h>