common: print the source location in mg2di_assert()

1 files changed, 10 insertions, 6 deletions

diff --git a/common.h b/common.h
index 0c644bd..9c36a33 100644
--- a/common.h
+++ b/common.h
@@ -30,12 +30,16 @@
 
 #define FD_STENCIL_MAX 4
 
-#define mg2di_assert(x)                                 \
-do {                                                    \
-    if (!(x)) {                                         \
-        fputs("Assertion " #x " failed\n", stderr);     \
-        abort();                                        \
-    }                                                   \
+#define STRINGIFY(x) #x
+#define SOURCE_LOC(f, l) f ":" STRINGIFY(l)
+
+#define mg2di_assert(x)                                     \
+do {                                                        \
+    if (!(x)) {                                             \
+        fputs(SOURCE_LOC(__FILE__, __LINE__)                \
+              ": " "Assertion " #x " failed\n", stderr);    \
+        abort();                                            \
+    }                                                       \
 } while (0)
 
 #endif /* MG2D_COMMON_H */