Fix -Wimplicit-function-declaration in configure

As this is an error with xcode 12, see bug #80171.

Author: nikic

Zend/Zend.m4

@@ -116,16 +116,16 @@ int main()
 		double d = (double) LONG_MIN * LONG_MIN + 2e9;
 
 		if ((long) d == 2e9 && (long) -d == -2e9) {
-			exit(0);
+			return 0;
 		}
 	} else if (sizeof(long) == 8) {
 		double correct = 18e18 - ((double) LONG_MIN * -2); /* Subtract ULONG_MAX + 1 */
 
 		if ((long) 18e18 == correct) { /* On 64-bit, only check between LONG_MAX and ULONG_MAX */
-			exit(0);
+			return 0;
 		}
 	}
-	exit(1);
+	return 1;
 }
 ]])], [
   AC_DEFINE([ZEND_DVAL_TO_LVAL_CAST_OK], 1, [Define if double cast to long preserves least significant bits])
@@ -249,7 +249,7 @@ int main()
   fprintf(fp, "%d %d\n", ZEND_MM_ALIGNMENT, zeros);
   fclose(fp);
 
-  exit(0);
+  return 0;
 }
 ]])], [
   LIBZEND_MM_ALIGN=`cat conftest.zend | cut -d ' ' -f 1`
@@ -318,6 +318,7 @@ AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <sys/mman.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
 #ifndef MAP_ANON
 # ifdef MAP_ANONYMOUS
 #  define MAP_ANON MAP_ANONYMOUS

Zend/acinclude.m4

@@ -63,7 +63,10 @@ dnl Check for broken sprintf()
 dnl
 AC_DEFUN([AC_ZEND_BROKEN_SPRINTF],[
   AC_CACHE_CHECK(whether sprintf is broken, ac_cv_broken_sprintf,[
-    AC_RUN_IFELSE([AC_LANG_SOURCE([[main() {char buf[20];exit(sprintf(buf,"testing 123")!=11); }]])],[
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <stdio.h>
+int main() {char buf[20]; return sprintf(buf,"testing 123")!=11; }
+]])],[
       ac_cv_broken_sprintf=no
     ],[
       ac_cv_broken_sprintf=yes

acinclude.m4

@@ -1209,14 +1209,14 @@ AC_DEFUN([PHP_DOES_PWRITE_WORK],[
 #include <unistd.h>
 #include <errno.h>
 $1
-    main() {
+    int main() {
     int fd = open("conftest_in", O_WRONLY|O_CREAT, 0600);
 
-    if (fd < 0) exit(1);
-    if (pwrite(fd, "text", 4, 0) != 4) exit(1);
+    if (fd < 0) return 1;
+    if (pwrite(fd, "text", 4, 0) != 4) return 1;
     /* Linux glibc breakage until 2.2.5 */
-    if (pwrite(fd, "text", 4, -1) != -1 || errno != EINVAL) exit(1);
-    exit(0);
+    if (pwrite(fd, "text", 4, -1) != -1 || errno != EINVAL) return 1;
+    return 0;
     }
 
   ]])],[
@@ -1239,14 +1239,14 @@ AC_DEFUN([PHP_DOES_PREAD_WORK],[
 #include <unistd.h>
 #include <errno.h>
 $1
-    main() {
+    int main() {
     char buf[3];
     int fd = open("conftest_in", O_RDONLY);
-    if (fd < 0) exit(1);
-    if (pread(fd, buf, 2, 0) != 2) exit(1);
+    if (fd < 0) return 1;
+    if (pread(fd, buf, 2, 0) != 2) return 1;
     /* Linux glibc breakage until 2.2.5 */
-    if (pread(fd, buf, 2, -1) != -1 || errno != EINVAL) exit(1);
-    exit(0);
+    if (pread(fd, buf, 2, -1) != -1 || errno != EINVAL) return 1;
+    return 0;
     }
   ]])],[
     ac_cv_pread=yes
@@ -1347,25 +1347,26 @@ AC_DEFUN([PHP_READDIR_R_TYPE],[
 #define _REENTRANT
 #include <sys/types.h>
 #include <dirent.h>
+#include <unistd.h>
 
 #ifndef PATH_MAX
 #define PATH_MAX 1024
 #endif
 
-main() {
+int main() {
   DIR *dir;
   char entry[sizeof(struct dirent)+PATH_MAX];
   struct dirent *pentry = (struct dirent *) &entry;
 
   dir = opendir("/");
   if (!dir)
-    exit(1);
+    return 1;
   if (readdir_r(dir, (struct dirent *) entry, &pentry) == 0) {
     close(dir);
-    exit(0);
+    return 0;
   }
   close(dir);
-  exit(1);
+  return 1;
 }
     ]])],[
       ac_cv_what_readdir_r=POSIX
@@ -1693,6 +1694,7 @@ AC_DEFUN([PHP_BROKEN_GLIBC_FOPEN_APPEND], [
   AC_CACHE_VAL(_cv_have_broken_glibc_fopen_append,[
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <stdio.h>
+#include <unistd.h>
 int main(int argc, char *argv[])
 {
   FILE *fp;
@@ -1702,7 +1704,7 @@ int main(int argc, char *argv[])
   fp = fopen(filename, "w");
   if (fp == NULL) {
     perror("fopen");
-    exit(2);
+    return 2;
   }
   fputs("foobar", fp);
   fclose(fp);
@@ -1812,13 +1814,13 @@ int seeker(void *cookie, __off64_t *position, int whence)
 
 cookie_io_functions_t funcs = {reader, writer, seeker, closer};
 
-main() {
+int main() {
   struct cookiedata g = { 0 };
   FILE *fp = fopencookie(&g, "r", funcs);
 
   if (fp && fseek(fp, 8192, SEEK_SET) == 0 && g.pos == 8192)
-    exit(0);
-  exit(1);
+    return 0;
+  return 1;
 }
 
 ]])], [

configure.ac

@@ -716,6 +716,7 @@ dnl Also check for working getaddrinfo
 AC_CACHE_CHECK([for getaddrinfo], ac_cv_func_getaddrinfo,
 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <netdb.h>]],
   [[struct addrinfo *g,h;g=&h;getaddrinfo("","",g,&g);]])],[AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <string.h>
 #include <netdb.h>
 #include <sys/types.h>
 #ifndef AF_INET
@@ -728,28 +729,28 @@ int main(void) {
   hints.ai_flags = AI_NUMERICHOST;
 
   if (getaddrinfo("127.0.0.1", 0, &hints, &ai) < 0) {
-    exit(1);
+    return 1;
   }
 
   if (ai == 0) {
-    exit(1);
+    return 1;
   }
 
   pai = ai;
 
   while (pai) {
     if (pai->ai_family != AF_INET) {
       /* 127.0.0.1/NUMERICHOST should only resolve ONE way */
-      exit(1);
+      return 1;
     }
     if (pai->ai_addr->sa_family != AF_INET) {
       /* 127.0.0.1/NUMERICHOST should only resolve ONE way */
-      exit(1);
+      return 1;
     }
     pai = pai->ai_next;
   }
   freeaddrinfo(ai);
-  exit(0);
+  return 0;
 }
   ]])],[ac_cv_func_getaddrinfo=yes], [ac_cv_func_getaddrinfo=no], [ac_cv_func_getaddrinfo=no])],
 [ac_cv_func_getaddrinfo=no])])

ext/standard/config.m4

@@ -7,6 +7,8 @@ AC_CACHE_CHECK([whether flush should be called explicitly after a buffered io],
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
 int main(int argc, char **argv)
 {
@@ -61,6 +63,8 @@ fi
 
 AC_CACHE_CHECK(for standard DES crypt, ac_cv_crypt_des,[
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <string.h>
+
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -72,9 +76,9 @@ AC_CACHE_CHECK(for standard DES crypt, ac_cv_crypt_des,[
 int main() {
 #if HAVE_CRYPT
 	char *encrypted = crypt("rasmuslerdorf","rl");
-	exit(!encrypted || strcmp(encrypted,"rl.3StKT.4T8M"));
+	return !encrypted || strcmp(encrypted,"rl.3StKT.4T8M");
 #else
-	exit(1);
+	return 1;
 #endif
 }]])],[
   ac_cv_crypt_des=yes
@@ -86,6 +90,8 @@ int main() {
 
 AC_CACHE_CHECK(for extended DES crypt, ac_cv_crypt_ext_des,[
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <string.h>
+
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -97,9 +103,9 @@ AC_CACHE_CHECK(for extended DES crypt, ac_cv_crypt_ext_des,[
 int main() {
 #if HAVE_CRYPT
 	char *encrypted = crypt("rasmuslerdorf","_J9..rasm");
-	exit(!encrypted || strcmp(encrypted,"_J9..rasmBYk8r9AiWNc"));
+	return !encrypted || strcmp(encrypted,"_J9..rasmBYk8r9AiWNc");
 #else
-	exit(1);
+	return 1;
 #endif
 }]])],[
   ac_cv_crypt_ext_des=yes
@@ -111,6 +117,8 @@ int main() {
 
 AC_CACHE_CHECK(for MD5 crypt, ac_cv_crypt_md5,[
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <string.h>
+
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -132,9 +140,9 @@ int main() {
 	strcpy(answer,salt);
 	strcat(answer,"rISCgZzpwk3UhDidwXvin0");
 	encrypted = crypt("rasmuslerdorf",salt);
-	exit(!encrypted || strcmp(encrypted,answer));
+	return !encrypted || strcmp(encrypted,answer);
 #else
-	exit(1);
+	return 1;
 #endif
 }]])],[
   ac_cv_crypt_md5=yes
@@ -146,6 +154,8 @@ int main() {
 
 AC_CACHE_CHECK(for Blowfish crypt, ac_cv_crypt_blowfish,[
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <string.h>
+
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -164,9 +174,9 @@ int main() {
 	strcpy(answer,salt);
 	strcpy(&answer[29],"nIdrcHdxcUxWomQX9j6kvERCFjTg7Ra");
 	encrypted = crypt("rasmuslerdorf",salt);
-	exit(!encrypted || strcmp(encrypted,answer));
+	return !encrypted || strcmp(encrypted,answer);
 #else
-	exit(1);
+	return 1;
 #endif
 }]])],[
   ac_cv_crypt_blowfish=yes
@@ -178,6 +188,8 @@ int main() {
 
 AC_CACHE_CHECK(for SHA512 crypt, ac_cv_crypt_sha512,[
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <string.h>
+
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -195,9 +207,9 @@ int main() {
 	strcpy(answer, salt);
 	strcat(answer, "EeHCRjm0bljalWuALHSTs1NB9ipEiLEXLhYeXdOpx22gmlmVejnVXFhd84cEKbYxCo.XuUTrW.RLraeEnsvWs/");
 	encrypted = crypt("rasmuslerdorf",salt);
-	exit(!encrypted || strcmp(encrypted,answer));
+	return !encrypted || strcmp(encrypted,answer);
 #else
-	exit(1);
+	return 1;
 #endif
 }]])],[
   ac_cv_crypt_sha512=yes
@@ -209,6 +221,8 @@ int main() {
 
 AC_CACHE_CHECK(for SHA256 crypt, ac_cv_crypt_sha256,[
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <string.h>
+
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -226,9 +240,9 @@ int main() {
 	strcpy(answer, salt);
 	strcat(answer, "cFAm2puLCujQ9t.0CxiFIIvFi4JyQx5UncCt/xRIX23");
 	encrypted = crypt("rasmuslerdorf",salt);
-	exit(!encrypted || strcmp(encrypted,answer));
+	return !encrypted || strcmp(encrypted,answer);
 #else
-	exit(1);
+	return 1;
 #endif
 }]])],[
   ac_cv_crypt_sha256=yes