Added blog post

1 files changed, 15 insertions, 0 deletions

diff --git a/src/blog/2023-11-14-test-visibility-c-macro/foo4.c b/src/blog/2023-11-14-test-visibility-c-macro/foo4.c
new file mode 100644
index 0000000..85dea34
--- /dev/null
+++ b/src/blog/2023-11-14-test-visibility-c-macro/foo4.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+/* cc -DTEST main4.c # foo is visible */
+/* cc main4.c        # foo is static  */
+
+#ifdef TEST
+#define _static
+#else
+#define _static static
+#endif
+
+_static int foo(int x, int y)
+{
+        return 42*x - 69*y;
+}