From 405342d075da81d372f454193e1c3f22ffe1e734 Mon Sep 17 00:00:00 2001
From: Chris Bieneman <beanz@apple.com>
Date: Tue, 13 Oct 2015 05:35:12 +0000
Subject: [PATCH] [CMake] LLVM_PROFDATA_FILE only works if you're using clang,
 so we should error out if it is specified when not using clang.

Also updated the CMake docs.

Based on post-commit review of r250108 from Sean Silvas.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@250150 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt | 6 +++++-
 docs/CMake.rst | 4 ++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2a2291c7822..d420e64228a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -594,7 +594,11 @@ set(LLVM_PROFDATA_FILE "" CACHE FILEPATH
   "Profiling data file to use when compiling in order to improve runtime performance.")
 
 if(LLVM_PROFDATA_FILE AND EXISTS ${LLVM_PROFDATA_FILE})
-  add_definitions("-fprofile-instr-use=${LLVM_PROFDATA_FILE}")
+  if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
+    add_definitions("-fprofile-instr-use=${LLVM_PROFDATA_FILE}")
+  else()
+    message(FATAL_ERROR "LLVM_PROFDATA_FILE can only be specified when compiling with clang")
+  endif()
 endif()
 
 include(AddLLVM)
diff --git a/docs/CMake.rst b/docs/CMake.rst
index 49657ba2dd8..0810bed90d4 100644
--- a/docs/CMake.rst
+++ b/docs/CMake.rst
@@ -334,6 +334,10 @@ LLVM-specific variables
 **LLVM_USE_OPROFILE**:BOOL
   Enable building OProfile JIT support. Defaults to OFF.
 
+**LLVM_PROFDATA_FILE**:PATH
+  Path to a profdata file to pass into clang's -fprofile-instr-use flag. This
+  can only be specified if you're building with clang.
+
 **LLVM_USE_INTEL_JITEVENTS**:BOOL
   Enable building support for Intel JIT Events API. Defaults to OFF.
 
-- 
2.34.1