Update noxfile.py

Co-authored-by: Lukas Atkinson <opensource@LukasAtkinson.de>

noxfile.py

@@ -70,13 +70,17 @@ def get_gcc_version_to_use():
             # This is free software; see the source for copying conditions.  There is NO
             # warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
             output = subprocess.check_output([CC, "--version"]).decode().split("\n")
-            if output[0].startswith("gcc"):
-                version = output[0].split(" ")[-1]
-                major_version = version.split(".")[0]
+            # look for a line "gcc WHATEVER VERSION.WHATEVER"
+            search_gcc_version = re.search(r"^gcc\b.* ([0-9]+)\.\S+$", output, re.M)
+
+            # look for a line "WHATEVER clang version VERSION.WHATEVER"
+            search_clang_version = re.search(r"\bclang version ([0-9]+)\.")
+
+            if search_gcc_version:
+                major_version = search_gcc_version.group(1)
                 CC = f"gcc-{major_version}"
-            elif " clang version " in output[0]:
-                version = output[0].split(" clang version ")[1]
-                major_version = version.split(".")[0]
+            elif search_clang_version:
+                major_version = search_clang_version.group(1)
                 CC = f"clang-{major_version}"
 
             if CC not in GCC_VERSIONS: