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package/libenca: fix C23 compatibility for getenv/getopt prototypes

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GCC 15 defaults to C23, which removes support for K&R-style
unprototyped function declarations. This causes build failures
with strict modern C libraries.

Add proper function prototypes for getopt, getopt_long,
getopt_long_only, getenv, and _getopt_internal to comply
with C23 requirements.

Fixes build with musl libc and GCC 15.

Upstream: https://github.com/Project-OSS-Revival/enca/pull/97

Fixes:

  https://autobuild.buildroot.net/results/982831f380ba21a28d4a9a0cb100d055771898e2/

Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Shubham Chakraborty
2026-04-18 21:25:12 +05:30
committed by Thomas Petazzoni
parent e4fefb5f61
commit c70315608a
1 changed files with 69 additions and 0 deletions
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69
package/libenca/0001-src-fix-C23-compatibility-for-getenv-getopt-prototyp.patch Normal file
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@@ -0,0 +1,69 @@
From 1782ea5dd749cd66b38b03aa02bd0c2f9d558f83 Mon Sep 17 00:00:00 2001
From: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
Date: Sat, 18 Apr 2026 14:25:27 +0530
Subject: [PATCH] src: fix C23 compatibility for getenv/getopt prototypes
GCC 15 defaults to C23, which no longer supports unprototyped function
declarations (K&R style). This fixes conflicts with strict prototypes
in modern C libraries like musl.
Build-tested in Buildroot using musl libc and C23.
Upstream: https://github.com/Project-OSS-Revival/enca/pull/97
Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
---
src/getopt.h | 16 +++++++++++-----
src/getopt_long.c | 2 +-
2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/src/getopt.h b/src/getopt.h
index 2eae587..91647ae 100644
--- a/src/getopt.h
+++ b/src/getopt.h
@@ -144,7 +144,7 @@ struct option
errors, only prototype getopt for the GNU C library. */
extern int getopt (int __argc, char *const *__argv, const char *__shortopts);
# else /* not __GNU_LIBRARY__ */
-extern int getopt ();
+extern int getopt (int argc, char * const argv[], const char *shortopts);
# endif /* __GNU_LIBRARY__ */
# ifndef __need_getopt
@@ -161,12 +161,18 @@ extern int _getopt_internal (int __argc, char *const *__argv,
int __long_only);
# endif
#else /* not __STDC__ */
-extern int getopt ();
+extern int getopt (int argc, char * const argv[], const char *shortopts);
# ifndef __need_getopt
-extern int getopt_long ();
-extern int getopt_long_only ();
+extern int getopt_long (int argc, char *const *argv, const char *shortopts,
+ const struct option *longopts, int *longind);
+extern int getopt_long_only (int argc, char *const *argv,
+ const char *shortopts,
+ const struct option *longopts, int *longind);
-extern int _getopt_internal ();
+extern int _getopt_internal (int __argc, char *const *__argv,
+ const char *__shortopts,
+ const struct option *__longopts, int *__longind,
+ int __long_only);
# endif
#endif /* __STDC__ */
diff --git a/src/getopt_long.c b/src/getopt_long.c
index caba753..a55fe2a 100644
--- a/src/getopt_long.c
+++ b/src/getopt_long.c
@@ -199,7 +199,7 @@ static char *posixly_correct;
whose names are inconsistent. */
#ifndef getenv
-extern char *getenv ();
+extern char *getenv (const char *name);
#endif
static char *
--
2.53.0