configure.ac: Fix -Wimplicit-int in PTHREAD_SCOPE_SYSTEM check

thesamesam · thesamesam · commit d74374acb36c · 2022-11-04T02:32:49.000Z
Clang 16 makes -Wimplicit-int fatal by default.

Avoids errors like:
```
conftest.c:142:7: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
```

Signed-off-by: Sam James &lt;sam@gentoo.org&gt;
diff --git a/configure.ac b/configure.ac
@@ -3308,7 +3308,7 @@ if test "$posix_threads" = "yes"; then
       void *foo(void *parm) {
         return NULL;
       }
-      main() {
+      int main() {
         pthread_attr_t attr;
         pthread_t id;
         if (pthread_attr_init(&attr)) return (-1);

Original file line number	Diff line number	Diff line change
`@@ -3308,7 +3308,7 @@ if test "$posix_threads" = "yes"; then`
`3308`	`3308`	`void foo(void parm) {`
`3309`	`3309`	`return NULL;`
`3310`	`3310`	`}`
`3311`		`- main() {`
	`3311`	`+ int main() {`
`3312`	`3312`	`pthread_attr_t attr;`
`3313`	`3313`	`pthread_t id;`
`3314`	`3314`	`if (pthread_attr_init(&attr)) return (-1);`