config: Check for program_invocation_short_name

This lets us pick it up on musl too, since there's no __MUSL__ macro.

Link: https://wiki.musl-libc.org/faq#Q:-Why-is-there-no-%3Ccode%3E__MUSL__%3C/code%3E-macro?

1 files changed, 9 insertions, 0 deletions

diff --git a/config/getprogname-gnu.c b/config/getprogname-gnu.c
new file mode 100644
index 0000000..6b97c5e
--- /dev/null
+++ b/config/getprogname-gnu.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include <errno.h>
+
+int main(void) {
+	const char *str = program_invocation_short_name;
+	return str[0];
+}