build: Check for compound literal storage-class support

This lets us use them on GCC >= 13, even before C23.

3 files changed, 8 insertions, 1 deletions

diff --git a/build/has/compound-literal-storage.c b/build/has/compound-literal-storage.c
new file mode 100644
index 0000000..e2281e1
--- /dev/null
+++ b/build/has/compound-literal-storage.c
@@ -0,0 +1,6 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+int main(void) {
+	return (static int){0};
+}
diff --git a/build/header.mk b/build/header.mk
index 8b697d6..919a2a2 100644
--- a/build/header.mk
+++ b/build/header.mk
@@ -19,6 +19,7 @@ HEADERS := \
     gen/has/acl-is-trivial-np.h \
     gen/has/acl-trivial.h \
     gen/has/builtin-riscv-pause.h \
+    gen/has/compound-literal-storage.h \
     gen/has/confstr.h \
     gen/has/extattr-get-file.h \
     gen/has/extattr-get-link.h \
diff --git a/src/diag.h b/src/diag.h
index 3bea9b2..7b3e8a5 100644
--- a/src/diag.h
+++ b/src/diag.h
@@ -27,7 +27,7 @@ struct bfs_loc {
 /**
  * Get the current source code location.
  */
-#if __STDC_VERSION__ >= C23
+#if BFS_HAS_COMPOUND_LITERAL_STORAGE
 #  define bfs_location() (&(static const struct bfs_loc)BFS_LOC_INIT)
 #else
 #  define bfs_location() (&(const struct bfs_loc)BFS_LOC_INIT)