From 8f9f3b4d3c0f86dce85df2aa12196dbb15e716f2 Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Sun, 22 Feb 2026 16:58:11 +0100
Subject: preprocessor: fix an edge case with erroneously recursive macro
 expansion

---
 test/07-pp.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'test')

diff --git a/test/07-pp.c b/test/07-pp.c
index dd179fb..b1afa17 100644
--- a/test/07-pp.c
+++ b/test/07-pp.c
@@ -50,6 +50,18 @@ struct crypto_ex_data_st {
 
 SKM_DEFINE_STACK_OF_INTERNAL(void, void, void)
 
+char *strchr(const char *, int);
+# define __glibc_const_generic(PTR, CTYPE, CALL)	\
+  _Generic (0 ? (PTR) : (void *) 1,			\
+	    const void *: (CTYPE) (CALL),		\
+	    default: CALL)
+#define indir(s,c) strchr(s,c)
+#define strchr(S, C)	__glibc_const_generic (S, const char *, indir(S, C))
+
+static void f(void) {
+   (void)strchr("",0);
+}
+
 #ifdef CMD_WORKING
 int
 main(V)
-- 
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