Patch suggested by Marc Nieper-Wißkirchen <marc.nieper+gnu@gmail.com> in
<https://lists.gnu.org/archive/html/bug-gnulib/2020-05/msg00081.html>.
* lib/c-stack.c: Include <stdio.h>.
+2020-05-09 Bruno Haible <bruno@clisp.org>
+
+ c-stack: Fix warning when DEBUG is enabled.
+ Patch suggested by Marc Nieper-Wißkirchen <marc.nieper+gnu@gmail.com> in
+ <https://lists.gnu.org/archive/html/bug-gnulib/2020-05/msg00081.html>.
+ * lib/c-stack.c: Include <stdio.h>.
+
2020-05-09 Bruno Haible <bruno@clisp.org>
Remove redundant definitions of _GL_ATTRIBUTE_FORMAT.
#include <unistd.h>
+#if DEBUG
+# include <stdio.h>
+#endif
+
#if HAVE_LIBSIGSEGV
# include <sigsegv.h>
#endif