build: Change default CC to be clang instead of gcc.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@144658 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/make/platform/clang_darwin.mk b/make/platform/clang_darwin.mk
index b3d36f8..8011d9c 100644
--- a/make/platform/clang_darwin.mk
+++ b/make/platform/clang_darwin.mk
@@ -67,7 +67,7 @@
 
 ###
 
-CC := gcc
+CC := clang
 
 # Forcibly strip off any -arch, as that totally breaks our universal support.
 override CC := $(subst -arch ,-arch_,$(CC))
diff --git a/make/platform/darwin_fat.mk b/make/platform/darwin_fat.mk
index 30e57a1..f9ec4c3 100644
--- a/make/platform/darwin_fat.mk
+++ b/make/platform/darwin_fat.mk
@@ -37,7 +37,7 @@
 #   <Option Name>.<Arch Name> := ...
 #   <Option Name>.<Config Name>.<Arch Name> := ...
 
-CC := gcc
+CC := clang
 
 CFLAGS := -Wall -Werror
 CFLAGS.Debug := $(CFLAGS) -g
diff --git a/make/platform/multi_arch.mk b/make/platform/multi_arch.mk
index eebc7b2..fe6ac4b 100644
--- a/make/platform/multi_arch.mk
+++ b/make/platform/multi_arch.mk
@@ -5,8 +5,7 @@
 Arch := i386
 Arch.m64 := x86_64
 
-CC := gcc
-CC.m32 := clang
+CC := clang
 
 CFLAGS := -Wall -Werror
 CFLAGS.m32 := $(CFLAGS) -m32 -O3