Port configure script to C99

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

swig-configure-c99.patch

@@ -0,0 +1,52 @@
+Add missing #include directives to obtain additional function
+prototypes.  This avoids altering the result of this test with C99
+compilers which do not support implicit function declarations.
+
+Submitted upstream: <https://github.com/swig/swig/pull/2483>
+
+diff --git a/CCache/configure b/CCache/configure
+index 829db3db32ca442a..66f60da79446541e 100755
+--- a/CCache/configure
++++ b/CCache/configure
+@@ -4135,6 +4135,9 @@ else $as_nop
+ 
+ #include <sys/types.h>
+ #include <stdarg.h>
++#include <stdio.h>
++#include <stdlib.h>
++#include <string.h>
+ void foo(const char *format, ...) {
+        va_list ap;
+        int len;
+@@ -4149,7 +4152,7 @@ void foo(const char *format, ...) {
+ 
+        exit(0);
+ }
+-main() { foo("hello"); }
++int main(void) { foo("hello"); }
+ 
+ _ACEOF
+ if ac_fn_c_try_run "$LINENO"
+diff --git a/CCache/configure.ac b/CCache/configure.ac
+index 2db3553ce796ec21..9afd49e8370d4cac 100644
+--- a/CCache/configure.ac
++++ b/CCache/configure.ac
+@@ -63,6 +63,9 @@ AC_CACHE_CHECK([for C99 vsnprintf],ccache_cv_HAVE_C99_VSNPRINTF,[
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ #include <sys/types.h>
+ #include <stdarg.h>
++#include <stdio.h>
++#include <stdlib.h>
++#include <string.h>
+ void foo(const char *format, ...) { 
+        va_list ap;
+        int len;
+@@ -77,7 +80,7 @@ void foo(const char *format, ...) {
+ 
+        exit(0);
+ }
+-main() { foo("hello"); }
++int main(void) { foo("hello"); }
+ ]])],[ccache_cv_HAVE_C99_VSNPRINTF=yes],[ccache_cv_HAVE_C99_VSNPRINTF=no],[ccache_cv_HAVE_C99_VSNPRINTF=cross])])
+ if test x"$ccache_cv_HAVE_C99_VSNPRINTF" = x"yes"; then
+     AC_DEFINE(HAVE_C99_VSNPRINTF, 1, [ ])

swig.spec

@@ -51,7 +51,7 @@
 Summary: Connects C/C++/Objective C to some high-level programming languages
 Name:    swig
 Version: 4.1.1
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: GPL-3.0-or-later AND BSD-3-Clause
 URL:     http://swig.sourceforge.net/
 Source0: http://downloads.sourceforge.net/project/swig/swig/swig-%{version}/swig-%{version}.tar.gz
@@ -62,6 +62,7 @@ Source2: description-ccache.h2m
 Source3: ccache-swig.sh
 Source4: ccache-swig.csh
 %endif
+Patch0: swig-configure-c99.patch
 
 BuildRequires: coreutils
 BuildRequires: findutils
@@ -340,6 +341,9 @@ install -pm 644 Tools/swig.gdb %{buildroot}%{_datadir}/%{name}/gdb
 %{_datadir}/%{name}/gdb
 
 %changelog
+* Thu Jan 12 2023 Florian Weimer <fweimer@redhat.com> - 4.1.1-2
+- Port configure script to C99
+
 * Thu Dec 01 2022 Jitka Plesnikova <jplesnik@redhat.com> - 4.1.1-1
 - Update to 4.1.1