Fix compiletest on FreeBSD

Recent FreeBSD gdb packages have a different format for the version string.

Author: asomers

src/tools/compiletest/src/main.rs

@@ -909,7 +909,8 @@ fn extract_gdb_version(full_version_line: &str) -> Option<u32> {
     // This particular form is documented in the GNU coding standards:
     // https://www.gnu.org/prep/standards/html_node/_002d_002dversion.html#g_t_002d_002dversion
 
-    let mut splits = full_version_line.rsplit(' ');
+    let unbracketed_part = full_version_line.split('[').next().unwrap();
+    let mut splits = unbracketed_part.trim_end().rsplit(' ');
     let version_string = splits.next().unwrap();
 
     let mut splits = version_string.split('.');

src/tools/compiletest/src/tests.rs

@@ -39,6 +39,9 @@ fn test_extract_gdb_version() {
         7012000: "GNU gdb (GDB) 7.12",
         7012000: "GNU gdb (GDB) 7.12.20161027-git",
         7012050: "GNU gdb (GDB) 7.12.50.20161027-git",
+
+        9002000: "GNU gdb (Ubuntu 9.2-0ubuntu1~20.04) 9.2",
+        10001000: "GNU gdb (GDB) 10.1 [GDB v10.1 for FreeBSD]",
     }
 }