Fix isInSystemMacro to handle pasted macros
Token pasted by the preprocessor (through ##) have a Spelling pointing to scratch buffer.
As a result they are not recognized at system macro, even though the pasting happened in
a system macro. Fix that by looking into the parent macro if the original lookup finds a
scratch buffer.
Differential Revision: https://reviews.llvm.org/D55782
This effectively fixes https://bugs.llvm.org/show_bug.cgi?id=35268,
llvm-svn: 352838
diff --git a/clang/test/Misc/warn-in-system-macro-def.c b/clang/test/Misc/warn-in-system-macro-def.c
new file mode 100644
index 0000000..b295130
--- /dev/null
+++ b/clang/test/Misc/warn-in-system-macro-def.c
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -isystem %S -Wdouble-promotion -fsyntax-only %s 2>&1 | FileCheck -allow-empty %s
+// CHECK: warning:
+// CHECK: expanded from macro 'ISNAN'
+// CHECK: expanded from macro 'isnan'
+
+#include <warn-in-system-macro-def.c.inc>
+
+#define isnan(x) \
+ (sizeof (x) == sizeof (float) \
+ ? __isnanf (x) \
+ : sizeof (x) == sizeof (double) \
+ ? __isnan (x) : __isnanl (x))
+
+int main(void)
+{
+ double foo = 1.0;
+
+ if (ISNAN(foo))
+ return 1;
+ return 0;
+}
