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From 8a399018269bebd3ee99d2f4f51656b1b74ed02d Mon Sep 17 00:00:00 2001
From: "Z. Liu" <zhixu.liu@gmail.com>
Date: Thu, 9 Jan 2025 14:19:48 +0800
Subject: [PATCH] autoconf: fix -Wimplicit-function-declaration
With modern C compilers this is a bug and will cause false positives in
feature tests.
Signed-off-by: Z. Liu <zhixu.liu@gmail.com>
---
autoconf/hercules.m4 | 17 ++++++++++++-----
configure.ac | 3 +++
2 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/autoconf/hercules.m4 b/autoconf/hercules.m4
index edd71d63..08647581 100644
--- a/autoconf/hercules.m4
+++ b/autoconf/hercules.m4
@@ -291,6 +291,7 @@ AC_DEFUN([_HC_CHECK_NEED_GETOPT_WRAPPER],
Will the linker complain about duplicate
symbols for getopt? We'll soon find out!
*/
+ extern int getopt(int, char *const[], const char *);
extern char *optarg;
extern int optind;
@@ -315,6 +316,8 @@ DUPGETOPT1
needs getopt. Will linker complain about
duplicate symbols for getopt? Let's see.
*/
+ extern int getopt(int, char *const[], const char *);
+ extern int test1();
extern char *optarg;
extern int optind;
extern int test2();
@@ -334,11 +337,11 @@ DUPGETOPT1
}
DUPGETOPT2
- libtool --mode=compile ${CC-cc} conftest1.c -c -o conftest1.lo > /dev/null 2>&1
- libtool --mode=compile ${CC-cc} conftest2.c -c -o conftest2.lo > /dev/null 2>&1
+ libtool --tag=CC --mode=compile ${CC-cc} conftest1.c -c -o conftest1.lo > /dev/null 2>&1
+ libtool --tag=CC --mode=compile ${CC-cc} conftest2.c -c -o conftest2.lo > /dev/null 2>&1
- libtool --mode=link ${CC-cc} -shared -rpath /lib -no-undefined conftest1.lo -o libconftest1.la > /dev/null 2>&1
- libtool --mode=link ${CC-cc} -shared -rpath /lib -no-undefined conftest2.lo libconftest1.la -o libconftest2.la > /dev/null 2>&1
+ libtool --tag=CC --mode=link ${CC-cc} -shared -rpath /lib -no-undefined conftest1.lo -o libconftest1.la > /dev/null 2>&1
+ libtool --tag=CC --mode=link ${CC-cc} -shared -rpath /lib -no-undefined conftest2.lo libconftest1.la -o libconftest2.la > /dev/null 2>&1
if test $? = 0; then
@@ -385,7 +388,11 @@ AC_DEFUN([HC_CHECK_NEED_GETOPT_OPTRESET],
[hc_cv_need_getopt_optreset],
[
AC_TRY_LINK(
- [],
+ [
+ #ifdef HAVE_UNISTD_H
+ #include <unistd.h>
+ #endif
+ ],
[
extern int optreset;
optreset=1;
diff --git a/configure.ac b/configure.ac
index f12d4705..68dae467 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1168,6 +1168,9 @@ if test "$GCC" = "yes"; then
-g -O2 -fomit-frame-pointer
*/
+ #if HAVE_STRING_H
+ #include <string.h>
+ #endif
int foo ()
{
--
2.45.2
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