libelftc: Const correctness for C23

On some platforms, e.g. Linux Clang 22.1.8 / glibc 2.43, strchr()
now implements the C23 behaviour where passing a const pointer to
strchr() also returns a const pointer.  This breaks libelftc during
the bootstrap build, since it assumes the return value is always
a mutable pointer.

Since the returned pointer is never modified in either case, make
it const.

MFC after:	1 week
Reviewed by:	jkoshy, markj, dim, emaste
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D58497

2 files changed, 3 insertions, 5 deletions

diff --git a/contrib/elftoolchain/libelftc/libelftc_dem_arm.c b/contrib/elftoolchain/libelftc/libelftc_dem_arm.c
index ec87f6f7a11b..872cbce4c4a3 100644
--- a/contrib/elftoolchain/libelftc/libelftc_dem_arm.c
+++ b/contrib/elftoolchain/libelftc/libelftc_dem_arm.c
@@ -404,8 +404,7 @@ static bool
 read_func(struct demangle_data *d)
 {
 	size_t len;
-	const char *name;
-	char *delim;
+	const char *name, *delim;
 
 	if (d == NULL)
 		return (false);
diff --git a/contrib/elftoolchain/libelftc/libelftc_dem_gnu2.c b/contrib/elftoolchain/libelftc/libelftc_dem_gnu2.c
index a414c7cdab80..df8d4e095384 100644
--- a/contrib/elftoolchain/libelftc/libelftc_dem_gnu2.c
+++ b/contrib/elftoolchain/libelftc/libelftc_dem_gnu2.c
@@ -255,7 +255,7 @@ clean:
 bool
 is_cpp_mangled_gnu2(const char *org)
 {
-	char *str;
+	const char *str;
 	bool rtn = false;
 
 	if (org == NULL)
@@ -487,8 +487,7 @@ static bool
 read_func(struct demangle_data *d)
 {
 	size_t len;
-	const char *name;
-	char *delim;
+	const char *name, *delim;
 
 	if (d == NULL)
 		return (false);