cmake: BSD: Mark /usr/local/include as system include directory

We add /usr/local/include to the include directory list for some BSD
systems. We should mark this as a system directory to avoid files from
/usr/local/include getting picked over files shipping with llvm.

This typically manifested as gtest headers installed with the system
getting picked over the ones shipping with llvm.

Patch by Petr Penzin <penzin.dev@gmail.com>

Differential Revision: https://reviews.llvm.org/D37415

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315952 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 13dc116..8d079f0 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -804,7 +804,7 @@ endif()
 if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
   # On FreeBSD, /usr/local/* is not used by default. In order to build LLVM
   # with libxml2, iconv.h, etc., we must add /usr/local paths.
-  include_directories("/usr/local/include")
+  include_directories(SYSTEM "/usr/local/include")
   link_directories("/usr/local/lib")
 endif(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")