cmake: Fix empty -D due to empty strings (closes #5522)

1 files changed, 18 insertions, 0 deletions

diff --git a/test cases/linuxlike/13 cmake dependency/testFlagSet.c b/test cases/linuxlike/13 cmake dependency/testFlagSet.c
new file mode 100644
index 000000000..0c9269034
--- /dev/null
+++ b/test cases/linuxlike/13 cmake dependency/testFlagSet.c
@@ -0,0 +1,18 @@
+#include<stdio.h>
+#include<zlib.h>
+
+#ifndef REQUIRED_MESON_FLAG1
+#error "REQUIRED_MESON_FLAG1 not set"
+#endif
+
+#ifndef REQUIRED_MESON_FLAG2
+#error "REQUIRED_MESON_FLAG2 not set"
+#endif
+
+int main(int argc, char *argv[]) {
+  printf("Hello World\n");
+  void * something = deflate;
+  if(something != 0)
+    return 0;
+  return 1;
+}