add -soname support

GH rui314#120

main.c

@@ -42,6 +42,7 @@ static void usage(int status) {
 static bool take_arg(char *arg) {
   char *x[] = {
     "-o", "-I", "-idirafter", "-include", "-x", "-MF", "-MT", "-Xlinker",
+    "-soname"
   };
 
   for (int i = 0; i < sizeof(x) / sizeof(*x); i++)
@@ -146,6 +147,12 @@ static void parse_args(int argc, char **argv) {
       continue;
     }
 
+    if (!strcmp(argv[i], "-soname")) {
+      strarray_push(&ld_extra_args, argv[i]);
+      strarray_push(&ld_extra_args, argv[++i]);
+      continue;
+    }
+
     if (!strcmp(argv[i], "-S")) {
       opt_S = true;
       continue;

test/driver.sh

@@ -309,4 +309,9 @@ echo 'int main() {}' | $chibicc -c -o $tmp/baz.o -xc -
 cc -Xlinker -z -Xlinker muldefs -Xlinker --gc-sections -o $tmp/foo $tmp/foo.o $tmp/bar.o $tmp/baz.o
 check -Xlinker
 
+# -soname
+echo 'int main() { return 0; }' | $chibicc -c -o $tmp/foo.o -xc -
+$chibicc -shared -soname libfoo.so.0 -o $tmp/libfoo.so $tmp/foo.o
+check -soname
+
 echo OK