Disable PIC/PIE for MSP430 target by default.

Relocatable code generation is meaningless on MSP430, as the platform is too small to use shared libraries.

Patch by Dmitry Mikushev!

Differential Revision: https://reviews.llvm.org/D56927

llvm-svn: 352181

2 files changed, 33 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChains/MSP430.h b/clang/lib/Driver/ToolChains/MSP430.h
index 61fd0e1455b..b5308a8dd68 100644
--- a/clang/lib/Driver/ToolChains/MSP430.h
+++ b/clang/lib/Driver/ToolChains/MSP430.h
@@ -36,6 +36,10 @@ public:
                              llvm::opt::ArgStringList &CC1Args,
                              Action::OffloadKind) const override;
 
+  bool isPICDefault() const override { return false; }
+  bool isPIEDefault() const override { return false; }
+  bool isPICDefaultForced() const override { return true; }
+
 protected:
   Tool *buildLinker() const override;
 
diff --git a/clang/test/CodeGen/msp430-reloc.c b/clang/test/CodeGen/msp430-reloc.c
new file mode 100644
index 00000000000..c69e8e64af8
--- /dev/null
+++ b/clang/test/CodeGen/msp430-reloc.c
@@ -0,0 +1,29 @@
+// RUN: %clang -target msp430 -fPIC -S %s -o - | FileCheck %s
+
+// Check the compilation does not crash as it was crashing before with "-fPIC" enabled
+
+void *alloca(unsigned int size);
+
+// CHECK: .globl foo
+short foo(char** data, char encoding)
+{
+	char* encoding_addr = alloca(sizeof(char));
+	*encoding_addr = encoding;
+
+	char tmp3 = *encoding_addr;
+	short conv2 = tmp3;
+	short and = conv2 & 0xf;
+
+	switch (and)
+	{
+	case 0 :
+	case 4 :
+	case 10 :
+		return 1;
+	case 11 :
+		return 2;
+	}
+
+	return 0;
+}
+