[llvm] f57dd41 - [CMake] Do not append -lm to CMAKE_REQUIRED_LIBRARIES on Apple

[Louis Dionne via llvm-commits]

Author: Louis Dionne
Date: 2020-06-05T12:45:30-04:00
New Revision: f57dd41562340b0d5d9931b3f1becca761a54d26

URL: https://github.com/llvm/llvm-project/commit/f57dd41562340b0d5d9931b3f1becca761a54d26
DIFF: https://github.com/llvm/llvm-project/commit/f57dd41562340b0d5d9931b3f1becca761a54d26.diff

LOG: [CMake] Do not append -lm to CMAKE_REQUIRED_LIBRARIES on Apple

On Apple platforms, linking against libSystem.dylib is sufficient, and
some Apple platforms don't provide libm.dylib. On those platforms, adding
-lm to CMAKE_REQUIRED_LIBRARIES causes all subsequent compile-flag checks
to fail due to the missing library.

Differential Revision: https://reviews.llvm.org/D81265

Added: 
    

Modified: 
    llvm/cmake/config-ix.cmake

Removed: 
    


################################################################################
diff  --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
index 777cfd628a84..90e5d327c757 100644
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -13,7 +13,7 @@ include(CheckCCompilerFlag)
 include(CheckCompilerVersion)
 include(HandleLLVMStdlib)
 
-if( UNIX AND NOT (BEOS OR HAIKU) )
+if( UNIX AND NOT (APPLE OR BEOS OR HAIKU) )
   # Used by check_symbol_exists:
   list(APPEND CMAKE_REQUIRED_LIBRARIES "m")
 endif()