macro: fix assert_cc() fallback

We need two-level macro-expansion, otherwise __LINE__ will not get
evaluated.

diff --git a/src/shared/macro.h b/src/shared/macro.h
index c22de91705fb51b26a74b3075f04d9710969bf75..aadb1959c033247594d97a71df182145cb161bba 100644 (file)
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -145,7 +145,9 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) {
 #if defined(static_assert)
 #define assert_cc(expr) static_assert(expr, #expr)
 #else
-#define assert_cc(expr) struct _assert_struct_ ## __LINE__ { char x[(expr) ? 0 : -1]; }
+#define assert___cc(expr, line) struct _assert_struct_ ## line { char x[(expr) ? 0 : -1]; }
+#define assert__cc(expr, line) assert___cc((expr), line)
+#define assert_cc(expr) assert__cc((expr), __LINE__)
 #endif
 
 #define assert_return(expr, r)                    \