https://github.com/swig/swig/pull/2483 From 784dfc917e99429bdbb70fb9dd80c16dfeb73659 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Thu, 12 Jan 2023 17:49:40 +0100 Subject: [PATCH] CCache: Do not rely on C89-only features in configure.ac 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. --- 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 #include +#include +#include +#include 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, [ ])