CMake: defines and uses macro add_llvm_definitions for keeping track
of compiler parameters explicitly added by the build
specification. This macro replaces the cmake built-in
`add_definitions'.

Detects glibc and defines _GNU_SOURCE accordingly.

Resolves bug 3882.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68428 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1edea94..95f36a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,6 +74,8 @@
   "${LLVM_MAIN_SRC_DIR}/cmake/modules"
   )
 
+include(AddLLVMDefinitions)
+
 if(WIN32)
   if(CYGWIN)
     set(LLVM_ON_WIN32 0)
@@ -110,7 +112,7 @@
 if( LLVM_ENABLE_PIC )
   if( SUPPORTS_FPIC_FLAG )
     message(STATUS "Building with -fPIC")
-    add_definitions(-fPIC)
+    add_llvm_definitions(-fPIC)
   else( SUPPORTS_FPIC_FLAG )
     message(STATUS "Warning: -fPIC not supported.")
   endif()
@@ -122,8 +124,8 @@
 
 # set(CMAKE_VERBOSE_MAKEFILE true)
 
-add_definitions( -D__STDC_LIMIT_MACROS )
-add_definitions( -D__STDC_CONSTANT_MACROS )
+add_llvm_definitions( -D__STDC_LIMIT_MACROS )
+add_llvm_definitions( -D__STDC_CONSTANT_MACROS )
 
 set(LLVM_PLO_FLAGS "" CACHE
   STRING "Flags for creating partially linked objects.")
@@ -133,7 +135,7 @@
   option(LLVM_BUILD_32_BITS "Build 32 bits executables and libraries." OFF)
   if( LLVM_BUILD_32_BITS )
     message(STATUS "Building 32 bits executables and libraries.")
-    add_definitions( -m32 )
+    add_llvm_definitions( -m32 )
     list(APPEND CMAKE_EXE_LINKER_FLAGS -m32)
     list(APPEND CMAKE_SHARED_LINKER_FLAGS -m32)
     set( LLVM_PLO_FLAGS -melf_i386 ${LLVM_PLO_FLAGS} )
@@ -141,11 +143,11 @@
 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
 
 if( MSVC )
-  add_definitions( -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS )
-  add_definitions( -D_SCL_SECURE_NO_WARNINGS -DCRT_NONSTDC_NO_WARNINGS )
-  add_definitions( -D_SCL_SECURE_NO_DEPRECATE )
-  add_definitions( -wd4146 -wd4503 -wd4996 -wd4800 -wd4244 -wd4624 )
-  add_definitions( -wd4355 -wd4715 -wd4180 -wd4345 -wd4224 )
+  add_llvm_definitions( -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS )
+  add_llvm_definitions( -D_SCL_SECURE_NO_WARNINGS -DCRT_NONSTDC_NO_WARNINGS )
+  add_llvm_definitions( -D_SCL_SECURE_NO_DEPRECATE )
+  add_llvm_definitions( -wd4146 -wd4503 -wd4996 -wd4800 -wd4244 -wd4624 )
+  add_llvm_definitions( -wd4355 -wd4715 -wd4180 -wd4345 -wd4224 )
 endif( MSVC )
 
 include_directories( ${LLVM_BINARY_DIR}/include ${LLVM_MAIN_INCLUDE_DIR})