https://github.com/jbeverly/pam_ssh_agent_auth/pull/41

From 634711a191c1b8be6ea6eb9251ab60a8cb73c6ad Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Fri, 30 Sep 2022 20:54:45 +0100
Subject: [PATCH 2/2] Add missing includes (implicit function declarations)

This fixes building with Clang 16.

Bug: https://bugs.gentoo.org/870721
Closes: https://github.com/jbeverly/pam_ssh_agent_auth/pull/36
Signed-off-by: Sam James <sam@gentoo.org>
--- a/configure.ac
+++ b/configure.ac
@@ -388,6 +388,7 @@ case "$host" in
 	    [AC_LANG_SOURCE([[
 #define testmacro foo
 #define testmacro bar
+#include <stdlib.h>
 int main(void) { exit(0); }
 	    ]])],
 	    [ AC_MSG_RESULT(yes) ],
@@ -500,6 +501,7 @@ int main(void) { exit(0); }
 	AC_DEFINE(HAVE_BUNDLE, 1, [Define if your system uses bundles instead of ELF shared objects])
 	AC_MSG_CHECKING(if we have working getaddrinfo)
 	AC_TRY_RUN([#include <mach-o/dyld.h>
+#include <stdlib.h>
 int main() { if (NSVersionOfRunTimeLibrary("System") >= (60 << 16))
 		exit(0);
 	else
@@ -918,6 +920,7 @@ AC_MSG_CHECKING(compiler and flags for sanity)
 AC_RUN_IFELSE(
 	[AC_LANG_SOURCE([
 #include <stdio.h>
+#include <stdlib.h>
 int main(){exit(0);}
 	])],
 	[	AC_MSG_RESULT(yes) ],
@@ -944,6 +947,7 @@ AC_CHECK_FUNCS(dirname, [AC_CHECK_HEADERS(libgen.h)] ,[
 				[AC_LANG_SOURCE([[
 #include <libgen.h>
 #include <string.h>
+#include <stdlib.h>
 
 int main(int argc, char **argv) {
     char *s, buf[32];
@@ -1102,6 +1106,7 @@ AC_RUN_IFELSE(
 	[AC_LANG_SOURCE([[
 #include <sys/types.h>
 #include <dirent.h>
+#include <stdlib.h>
 int main(void){struct dirent d;exit(sizeof(d.d_name)<=sizeof(char));}
 	]])],
 	[AC_MSG_RESULT(yes)],
@@ -1384,6 +1389,7 @@ if test "x$ac_cv_func_snprintf" = "xyes" ; then
 	AC_RUN_IFELSE(
 		[AC_LANG_SOURCE([[
 #include <stdio.h>
+#include <stdlib.h>
 int main(void){char b[5];snprintf(b,5,"123456789");exit(b[4]!='\0');}
 		]])],
 		[AC_MSG_RESULT(yes)],
@@ -1406,8 +1412,10 @@ if test "x$ac_cv_func_asprintf" != "xyes" && \
 	AC_RUN_IFELSE(
 		[AC_LANG_SOURCE([[
 #include <sys/types.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdlib.h>
 
 int x_snprintf(char *str,size_t count,const char *fmt,...)
 {
@@ -1435,7 +1443,8 @@ fi
 # check that the fmt argument is const char * or just char *.
 # This is only useful for when BROKEN_SNPRINTF
 AC_MSG_CHECKING([whether snprintf can declare const char *fmt])
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <stddef.h>
+	   #include <stdio.h>
 	   int snprintf(char *a, size_t b, const char *c, ...) { return 0; }
 	   int main(void) { snprintf(0, 0, 0); } 
     ]])],
@@ -1496,6 +1505,7 @@ if test ! -z "$check_for_openpty_ctty_bug"; then
 #include <sys/fcntl.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <stdlib.h>
 
 int
 main()
@@ -1543,6 +1553,7 @@ if test "x$ac_cv_func_getaddrinfo" = "xyes" && \
 	AC_RUN_IFELSE(
 		[AC_LANG_SOURCE([[
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/socket.h>
 #include <netdb.h>
 #include <errno.h>
@@ -1615,6 +1626,7 @@ if test "x$ac_cv_func_getaddrinfo" = "xyes" && \
 	AC_RUN_IFELSE(
 		[AC_LANG_SOURCE([[
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/socket.h>
 #include <netdb.h>
 #include <errno.h>
@@ -1677,6 +1689,7 @@ if test "x$check_for_conflicting_getspnam" = "x1"; then
 	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
 		[
 #include <shadow.h>
+#include <stdlib.h>
 int main(void) {exit(0);}
 		])],
 		[
@@ -1750,6 +1763,7 @@ AC_RUN_IFELSE(
 	[AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 #include <openssl/opensslv.h>
 #define DATA "conftest.sslincver"
 int main(void) {
@@ -1785,6 +1799,7 @@ AC_RUN_IFELSE(
 	[AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 #include <openssl/opensslv.h>
 #include <openssl/crypto.h>
 #define DATA "conftest.ssllibver"
@@ -1828,7 +1843,9 @@ AC_MSG_CHECKING([whether OpenSSL's headers match the library])
 AC_RUN_IFELSE(
 	[AC_LANG_SOURCE([[
 #include <string.h>
+#include <openssl/crypto.h>
 #include <openssl/opensslv.h>
+#include <stdlib.h>
 int main(void) { exit(SSLeay() == OPENSSL_VERSION_NUMBER ? 0 : 1); }
 	]])],
 	[
@@ -1907,6 +1924,7 @@ AC_MSG_CHECKING([whether OpenSSL has crippled AES support])
 AC_LINK_IFELSE(
 	[AC_LANG_SOURCE([[
 #include <string.h>
+#include <stdlib.h>
 #include <openssl/evp.h>
 int main(void) { exit(EVP_aes_192_cbc() == NULL || EVP_aes_256_cbc() == NULL);}
 	]])],
@@ -1952,6 +1970,7 @@ AC_MSG_CHECKING([whether OpenSSL's PRNG is internally seeded])
 AC_RUN_IFELSE(
 	[AC_LANG_SOURCE([[
 #include <string.h>
+#include <stdlib.h>
 #include <openssl/rand.h>
 int main(void) { exit(RAND_status() == 1 ? 0 : 1); }
 	]])],
@@ -2123,6 +2142,7 @@ if test -z "$have_llong_max"; then
 	AC_RUN_IFELSE(
 		[AC_LANG_SOURCE([[
 #include <stdio.h>
+#include <stdlib.h>
 /* Why is this so damn hard? */
 #ifdef __GNUC__
 # undef __GNUC__
@@ -2597,6 +2617,7 @@ dnl test snprintf (broken on SCO w/gcc)
 		[AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 #ifdef HAVE_SNPRINTF
 int main(void)
 {
@@ -2740,6 +2761,7 @@ AC_CACHE_CHECK([for msg_accrights field in struct msghdr],
 		ac_cv_have_accrights_in_msghdr, [
 	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
 		[
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
@@ -2767,6 +2789,7 @@ AC_CACHE_CHECK([for msg_control field in struct msghdr],
 		ac_cv_have_control_in_msghdr, [
 	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
 		[
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
@@ -2791,7 +2814,9 @@ if test "x$ac_cv_have_control_in_msghdr" = "xyes" ; then
 fi
 
 AC_CACHE_CHECK([if libc defines __progname], ac_cv_libc_defines___progname, [
-	AC_TRY_LINK([],
+	AC_TRY_LINK([
+#include <stdio.h>
+],
 		[ extern char *__progname; printf("%s", __progname); ],
 		[ ac_cv_libc_defines___progname="yes" ],
 		[ ac_cv_libc_defines___progname="no" ]
@@ -2871,7 +2896,9 @@ if test "x$ac_cv_have_getopt_optreset" = "xyes" ; then
 fi
 
 AC_CACHE_CHECK([if libc defines sys_errlist], ac_cv_libc_defines_sys_errlist, [
-	AC_TRY_LINK([],
+	AC_TRY_LINK([
+#include <stdio.h>
+],
 		[ extern const char *const sys_errlist[]; printf("%s", sys_errlist[0]);],
 		[ ac_cv_libc_defines_sys_errlist="yes" ],
 		[ ac_cv_libc_defines_sys_errlist="no" ]
@@ -2884,7 +2911,9 @@ fi
 
 
 AC_CACHE_CHECK([if libc defines sys_nerr], ac_cv_libc_defines_sys_nerr, [
-	AC_TRY_LINK([],
+	AC_TRY_LINK([
+#include <stdio.h>
+],
 		[ extern int sys_nerr; printf("%i", sys_nerr);],
 		[ ac_cv_libc_defines_sys_nerr="yes" ],
 		[ ac_cv_libc_defines_sys_nerr="no" ]