From f57dd41562340b0d5d9931b3f1becca761a54d26 Mon Sep 17 00:00:00 2001
From: Louis Dionne <ldionne@apple.com>
Date: Fri, 5 Jun 2020 11:12:47 -0400
Subject: [PATCH] [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
---
 llvm/cmake/config-ix.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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()