[libcxxabi] Allow target flags to affect configuration tests.
Summary:
This patch changes the libc++abi CMake so that it adds certain target flags like '-m32' or '--gcc-toolchain' before including `config-ix.cmake`.
Since these flags can affect things like `check_library_exists([...])` they needed to be added before the tests are performed.
Additionally this patch adds `LIBCXXABI_BUILD_32_BITS` which defaults to `LLVM_BUILD_32_BITS`.
This patch fixes:
https://llvm.org/bugs/show_bug.cgi?id=27950
https://llvm.org/bugs/show_bug.cgi?id=27959
Reviewers: danalbert, jroelofs, bcraig, compnerd, EricWF
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D20886
git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@271470 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6bebf53..4900b6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -115,6 +115,8 @@
option(LIBCXXABI_USE_LLVM_UNWINDER "Build and use the LLVM unwinder." OFF)
option(LIBCXXABI_ENABLE_THREADS "Build with threads enabled" ON)
option(LIBCXXABI_HAS_PTHREAD_API "Ignore auto-detection and force use of pthread API" OFF)
+option(LIBCXXABI_BUILD_32_BITS "Build 32 bit libc++abi." ${LLVM_BUILD_32_BITS})
+set(LIBCXXABI_TARGET_TRIPLE "" CACHE STRING "Target triple for cross compiling.")
set(LIBCXXABI_GCC_TOOLCHAIN "" CACHE PATH "GCC toolchain for cross compiling.")
set(LIBCXXABI_SYSROOT "" CACHE PATH "Sysroot for cross compiling.")
set(LIBCXXABI_LIBCXX_LIBRARY_PATH "" CACHE PATH "The path to libc++ library.")
@@ -173,9 +175,6 @@
${CMAKE_MODULE_PATH}
)
-# Configure compiler.
-include(config-ix)
-
set(LIBCXXABI_COMPILER ${CMAKE_CXX_COMPILER})
set(LIBCXXABI_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
set(LIBCXXABI_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
@@ -191,6 +190,16 @@
"The path to libc++ library.")
endif ()
+
+# Check that we can build with 32 bits if requested.
+if (CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32)
+ if (LIBCXXABI_BUILD_32_BITS AND NOT LLVM_BUILD_32_BITS) # Don't duplicate the output from LLVM
+ message(STATUS "Building 32 bits executables and libraries.")
+ endif()
+elseif(LIBCXXABI_BUILD_32_BITS)
+ message(FATAL_ERROR "LIBCXXABI_BUILD_32_BITS=ON is not supported on this platform.")
+endif()
+
#===============================================================================
# Setup Compiler Flags
#===============================================================================
@@ -202,11 +211,30 @@
endif()
endmacro()
+macro(add_target_flags_if condition var)
+ if (${condition})
+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${var}")
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${var}")
+ list(APPEND LIBCXXABI_LINK_FLAGS ${var})
+ endif()
+endmacro()
+
set(LIBCXXABI_C_FLAGS "")
set(LIBCXXABI_CXX_FLAGS "")
set(LIBCXXABI_COMPILE_FLAGS "")
set(LIBCXXABI_LINK_FLAGS "")
+# Configure target flags
+add_target_flags_if(LIBCXXABI_BUILD_32_BITS "-m32")
+add_target_flags_if(LIBCXXABI_TARGET_TRIPLE
+ "-target ${LIBCXXABI_TARGET_TRIPLE}")
+add_target_flags_if(LIBCXXABI_GCC_TOOLCHAIN
+ "-gcc-toolchain ${LIBCXXABI_GCC_TOOLCHAIN}")
+add_target_flags_if(LIBCXXABI_SYSROOT
+ "--sysroot=${LIBCXXABI_SYSROOT}")
+
+# Configure compiler. Must happen after setting the target flags.
+include(config-ix)
if (LIBCXXABI_HAS_NOSTDINCXX_FLAG)
list(APPEND LIBCXXABI_COMPILE_FLAGS -nostdinc++)
@@ -312,12 +340,6 @@
add_definitions(-DLIBCXXABI_USE_LLVM_UNWINDER=1)
endif()
-append_if(LIBCXXABI_COMPILE_FLAGS LIBCXXABI_TARGET_TRIPLE
- "-target ${LIBCXXABI_TARGET_TRIPLE}")
-append_if(LIBCXXABI_COMPILE_FLAGS LIBCXXABI_GCC_TOOLCHAIN
- "-gcc-toolchain ${LIBCXXABI_GCC_TOOLCHAIN}")
-append_if(LIBCXXABI_COMPILE_FLAGS LIBCXXABI_SYSROOT
- "--sysroot ${LIBCXXABI_SYSROOT}")
string(REPLACE ";" " " LIBCXXABI_CXX_FLAGS "${LIBCXXABI_CXX_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBCXXABI_CXX_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBCXXABI_C_FLAGS}")