From db7fab775d03438b4cfce6b49fab2d3176ecb1d3 Mon Sep 17 00:00:00 2001
From: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Date: Sat, 11 May 2024 19:38:01 +0200
Subject: [PATCH] Fix getopt linking error with musl-libc

The buildroot project, to which the sscep application was added, has
configurations that raise the following linking error:
buildroot/output/host/opt/ext-toolchain/bin/../lib/gcc/i586-buildroot-linux-musl/9.3.0/../../../../i586-buildroot-linux-musl/bin/ld: buildroot/output/host/i586-buildroot-linux-musl/sysroot/lib/libc.a(getopt.o): in function `getopt':
getopt.c:(.text.getopt+0x0): multiple definition of `getopt'; src/getopt.o:getopt.c:(.text+0x0): first defined here
buildroot/output/host/opt/ext-toolchain/bin/../lib/gcc/i586-buildroot-linux-musl/9.3.0/../../../../i586-buildroot-linux-musl/bin/ld: buildroot/output/host/i586-buildroot-linux-musl/sysroot/lib/libc.a(getopt.o):(.data.optind+0x0): multiple definition of `optind'; src/getopt.o:(.data+0x0): first defined here
collect2: error: ld returned 1 exit status

The commit 65561b53344b8 ("Fix getopt linking error") actually fixed the
linking error only for uclibc, but not for musl-libc. The patch fixes
the error for both uclibc and musl-libc.

Link: http://autobuild.buildroot.net/results/d5b1b4e5e9d9c8eca5e75c345db4d1f3f0cd84ed/build-end.log
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Upstream: https://github.com/certnanny/sscep/pull/181
---
 configure.ac |  2 +-
 src/getopt.c | 12 ++----------
 2 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/configure.ac b/configure.ac
index 9f3ee15686a2..7a968d97dcaa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -34,7 +34,7 @@ AC_TYPE_SIZE_T
 # Checks for library functions.
 AC_FUNC_MALLOC
 AC_FUNC_REALLOC
-AC_CHECK_FUNCS([alarm gethostbyname memset socket strchr strdup strstr])
+AC_CHECK_FUNCS([alarm gethostbyname getopt memset socket strchr strdup strstr])
 
 AC_CONFIG_FILES([Makefile])
 AC_SUBST([LIBTOOL_DEPS])
diff --git a/src/getopt.c b/src/getopt.c
index 0109406ba4ac..8793052845ed 100644
--- a/src/getopt.c
+++ b/src/getopt.c
@@ -31,15 +31,7 @@
 #include <stddef.h>
 #include <string.h>
 
-#define GETOPT_INTERFACE_VERSION 2
-#if !defined _LIBC && defined __GLIBC__ && __GLIBC__ >= 2
-# include <gnu-versions.h>
-# if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
-#  define ELIDE_CODE
-# endif
-#endif
-
-#ifndef ELIDE_CODE
+#ifndef HAVE_GETOPT
 
 char* optarg;
 int optopt;
@@ -237,4 +229,4 @@ int getopt_long(int argc, char* const argv[], const char* optstring,
   return retval;
 }
 
-#endif	/* Not ELIDE_CODE.  */
+#endif	/* HAVE_GETOPT  */
-- 
2.43.0