Auto merge of #28638 - wthrowe:gdb-version, r=alexcrichton

GDB 7.10 was recently released.

src/compiletest/compiletest.rs

@@ -348,7 +348,7 @@ fn extract_gdb_version(full_version_line: Option<String>) -> Option<String> {
           if !full_version_line.trim().is_empty() => {
             let full_version_line = full_version_line.trim();
 
-            // used to be a regex "(^|[^0-9])([0-9]\.[0-9])([^0-9]|$)"
+            // used to be a regex "(^|[^0-9])([0-9]\.[0-9]+)"
             for (pos, c) in full_version_line.char_indices() {
                 if !c.is_digit(10) { continue }
                 if pos + 2 >= full_version_line.len() { continue }
@@ -357,11 +357,12 @@ fn extract_gdb_version(full_version_line: Option<String>) -> Option<String> {
                 if pos > 0 && full_version_line.char_at_reverse(pos).is_digit(10) {
                     continue
                 }
-                if pos + 3 < full_version_line.len() &&
-                   full_version_line.char_at(pos + 3).is_digit(10) {
-                    continue
+                let mut end = pos + 3;
+                while end < full_version_line.len() &&
+                      full_version_line.char_at(end).is_digit(10) {
+                    end += 1;
                 }
-                return Some(full_version_line[pos..pos+3].to_owned());
+                return Some(full_version_line[pos..end].to_owned());
             }
             println!("Could not extract GDB version from line '{}'",
                      full_version_line);