Merge branch 'warning' into 'master'

Fix few warnings

See merge request redox-os/relibc!236

src/ld_so/src/lib.rs

@@ -48,7 +48,7 @@ pub unsafe extern "C" fn _start() {
 
 #[naked]
 #[no_mangle]
-pub unsafe extern "C" fn main(argc: isize, argv: *const *const i8) -> usize {
+pub unsafe extern "C" fn main(_argc: isize, _argv: *const *const i8) -> usize {
     // LD
     0x1D
 }

tests/stdio/all.c

@@ -21,7 +21,7 @@ int main(void) {
     ERROR_IF(fgets, s, == NULL);
     printf("%s\n", in);
 
-    int vb = setvbuf(stdout, 0, _IONBF, 0);
+    __attribute__((unused)) int vb = setvbuf(stdout, 0, _IONBF, 0);
     //ERROR_IF(setvbuf, vb, > 0); // TODO: Cannot use this, doesn't set errno
     //UNEXP_IF(setvbuf, vb, != 0);
 

tests/string/strsignal.c

@@ -7,8 +7,7 @@
 
 int main(void) {
     puts("# strsignal #");
-    char *x = strsignal(SIGHUP);
-    int res;
+    const char *x = strsignal(SIGHUP);
     if (strcmp(x, "Hangup")) {
         printf("Incorrect strsignal (1), found: .%s.\n", x);
         exit(EXIT_FAILURE);

tests/unistd/swab.c

@@ -1,3 +1,4 @@
+#include <stdio.h>
 #include <unistd.h>
 
 int main(int argc, char ** argv) {