Fix alloca support for Cygwin. On cygwin its __alloca not __builtin_alloca

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19776 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 0efdb65..6195b76 100644 (file)
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -723,7 +723,10 @@ void CWriter::writeOperand(Value *Operand) {
 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(__CYGWIN__) || defined(__APPLE__)\n"
+      << "#if defined(__CYGWIN__)\n"
+      << "extern void *_alloca(unsigned long);\n"
+      << "#define alloca(x) _alloca(x)\n"
+      << "#elif defined(__APPLE__)\n"
       << "extern void *__builtin_alloca(unsigned long);\n"
       << "#define alloca(x) __builtin_alloca(x)\n"
       << "#elif defined(__sun__)\n"

diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index 0efdb65..6195b76 100644 (file)
--- a/lib/Target/CBackend/Writer.cpp
+++ b/lib/Target/CBackend/Writer.cpp
@@ -723,7 +723,10 @@ void CWriter::writeOperand(Value *Operand) {
 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(__CYGWIN__) || defined(__APPLE__)\n"
+      << "#if defined(__CYGWIN__)\n"
+      << "extern void *_alloca(unsigned long);\n"
+      << "#define alloca(x) _alloca(x)\n"
+      << "#elif defined(__APPLE__)\n"
       << "extern void *__builtin_alloca(unsigned long);\n"
       << "#define alloca(x) __builtin_alloca(x)\n"
       << "#elif defined(__sun__)\n"