Apple's MacOS X is another OS which does not provide alloca() via <alloca.h>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14781 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index cbdca3c..a7c2bd5 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -664,7 +664,7 @@
static void generateCompilerSpecificCode(std::ostream& Out) {
// Alloca is hard to get, and we don't want to include stdlib.h here...
Out << "/* get a declaration for alloca */\n"
- << "#if defined(sun) || defined(__CYGWIN__)\n"
+ << "#if defined(sun) || defined(__CYGWIN__) || defined(__APPLE__)\n"
<< "extern void *__builtin_alloca(unsigned long);\n"
<< "#define alloca(x) __builtin_alloca(x)\n"
<< "#else\n"