Don't load values out of global constants with weak

linkage: the value may be replaced with something
different at link time.  (Frontends that want to
allow values to be loaded out of weak constants can
give their constants weak_odr linkage).

llvm-svn: 67407

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/test/FrontendC/weak_constant.c b/llvm/test/FrontendC/weak_constant.c
new file mode 100644
index 00000000000..53379482cb4
--- /dev/null
+++ b/llvm/test/FrontendC/weak_constant.c
@@ -0,0 +1,12 @@
+// RUN: %llvmgcc -S %s -O1 -o - | grep {ret.*123}
+// Check for bug compatibility with gcc.
+
+const int x __attribute((weak)) = 123;
+
+int* f(void) {
+  return &x;
+}
+
+int g(void) {
+  return *f();
+}