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Adding a new option to CMake to disable C++ atexit on llvm-shlib.

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Summary:
This is desirable for WebKit and other clients of the llvm-shlib because C++ exit time destructors have a tendency to crash when invoked from multi-threaded applications.

Ideally this option will be temporary, because the ideal fix is to just not have exit time destructors.

Reviewers: chapuni, ributzka

Reviewed By: ributzka

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D6572

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223805 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Bieneman 2014-12-09 18:49:55 +00:00
parent 648f7c7eb1
commit eaf5997921
3 changed files with 14 additions and 0 deletions
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4
CMakeLists.txt
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@ -324,6 +324,10 @@ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
"Build compiler-rt as an external project." OFF)
option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library" OFF)
option(LLVM_DISABLE_LLVM_DYLIB_ATEXIT "Disable llvm-shlib's atexit destructors." ON)
if(LLVM_DISABLE_LLVM_DYLIB_ATEXIT)
set(DISABLE_LLVM_DYLIB_ATEXIT 1)
endif()
# All options referred to from HandleLLVMOptions have to be specified
# BEFORE this include, otherwise options will not be correctly set on

3
include/llvm/Config/config.h.cmake
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@ -18,6 +18,9 @@
/* Define to enable crash overrides */
#cmakedefine ENABLE_CRASH_OVERRIDES
/* Define to disable C++ atexit */
#cmakedefine DISABLE_LLVM_DYLIB_ATEXIT
/* Define if position independent code is enabled */
#cmakedefine ENABLE_PIC

7
tools/llvm-shlib/libllvm.cpp
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@ -11,3 +11,10 @@
// you can't define a target with no sources.
//
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h"
#if defined(DISABLE_LLVM_DYLIB_ATEXIT)
extern "C" int __cxa_atexit();
extern "C" int __cxa_atexit() { return 0; }
#endif