Reapply "Handle non-Apple packaged GCC versions (#34)" (#36)

This reverts commit 0d5b979, with a fix
included for the regex.

We had the + quantifier for the space between cc_version_num and
cc_build_string in the wrong place which Python 3.10 complained about
(but later versions mysteriously silently accepted?)

Author: lukel97

lnt/testing/util/compilers.py

@@ -76,7 +76,8 @@ def get_cc_info(path, cc_flags=[]):
         logger.error("unable to find compiler version: %r: %r" %
                      (cc, cc_version))
     else:
-        m = re.match(r'(.*) version ([^ ]*) +(\([^(]*\))(.*)', version_ln)
+        m = re.match(r'(.*) version ([^ ]*) +(?:[0-9]+ +)?(\([^(]*\))(.*)',
+                     version_ln)
         if m is not None:
             cc_name, cc_version_num, cc_build_string, cc_extra = m.groups()
         else:
@@ -104,15 +105,17 @@ def get_cc_info(path, cc_flags=[]):
         cc_src_tag = cc_version_num
 
     elif cc_name == 'gcc' and (cc_extra == '' or
+                               cc_extra == '(GCC)' or
                                re.match(r' \(dot [0-9]+\)', cc_extra)):
         cc_norm_name = 'gcc'
         m = re.match(r'\(Apple Inc. build ([0-9]*)\)', cc_build_string)
         if m:
             cc_build = 'PROD'
             cc_src_tag, = m.groups()
+        elif 'experimental' in cc_build_string:
+            cc_build = 'DEV'
         else:
-            logger.error('unable to determine gcc build version: %r' %
-                         cc_build_string)
+            cc_build = 'PROD'
     elif (cc_name in ('clang', 'LLVM', 'Debian clang', 'Apple clang',
                       'Apple LLVM') and
           (cc_extra == '' or 'based on LLVM' in cc_extra or

tests/SharedInputs/FakeCompilers/fakecompiler.py

@@ -178,6 +178,28 @@ def print_verbose_info(self):
  "%s" "-cc1" "-E" ... more boring stuff here ...""" % (
             g_program,), file=sys.stderr)
 
+class GCCDebian(FakeCompiler):
+    compiler_name = "gcc-debian"
+
+    def print_verbose_info(self):
+        print("""\
+Target: x86_64-linux-gnu
+gcc version 12.2.0 (Debian 12.2.0-14+deb12u1)""", file=sys.stderr)
+
+    def print_dumpmachine(self):
+        print("x86_64-linux-gnu")
+
+class GCCTrunk(FakeCompiler):
+    compiler_name = "gcc-trunk"
+
+    def print_verbose_info(self):
+        print("""\
+Target: x86_64-linux-gnu
+gcc version 16.0.0 20250807 (experimental) (GCC)""", file=sys.stderr)
+
+    def print_dumpmachine(self):
+        print("x86_64-linux-gnu")
+
 
 fake_compilers = dict((value.compiler_name, value)
                       for key, value in locals().items()

tests/SharedInputs/FakeCompilers/gcc-debian

@@ -0,0 +1 @@
+fakecompiler.py

tests/SharedInputs/FakeCompilers/gcc-trunk

@@ -0,0 +1 @@
+fakecompiler.py

tests/testing/Compilers.py

@@ -66,3 +66,19 @@ def get_info(name):
 pprint.pprint(info)
 assert info['cc_name'] == 'clang'
 assert info['cc_version_number'] == '3.2'
+
+# Check a GCC packaged from Debian.
+info = get_info("gcc-debian")
+pprint.pprint(info)
+assert info['cc_name'] == 'gcc'
+assert info['cc_build'] == 'PROD'
+assert info['cc_version_number'] == '12.2.0'
+assert info['cc_target'] == 'x86_64-linux-gnu'
+
+# Check a GCC built from trunk.
+info = get_info("gcc-trunk")
+pprint.pprint(info)
+assert info['cc_name'] == 'gcc'
+assert info['cc_build'] == 'DEV'
+assert info['cc_version_number'] == '16.0.0'
+assert info['cc_target'] == 'x86_64-linux-gnu'