tests: add support for c++23/c++26 detection

Signed-off-by: Steven Noonan <steven@uplinklabs.net>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

unittests/linuxliketests.py

@@ -517,6 +517,15 @@ class LinuxlikeTests(BasePlatformTests):
         has_cpp20 = (compiler.get_id() not in {'clang', 'gcc'} or
                      compiler.get_id() == 'clang' and _clang_at_least(compiler, '>=10.0.0', None) or
                      compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=10.0.0'))
+        has_cpp2b = (compiler.get_id() not in {'clang', 'gcc'} or
+                     compiler.get_id() == 'clang' and _clang_at_least(compiler, '>=12.0.0', None) or
+                     compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=12.2.0'))
+        has_cpp23 = (compiler.get_id() not in {'clang', 'gcc'} or
+                     compiler.get_id() == 'clang' and _clang_at_least(compiler, '>=17.0.0', None) or
+                     compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=12.2.0'))
+        has_cpp26 = (compiler.get_id() not in {'clang', 'gcc'} or
+                     compiler.get_id() == 'clang' and _clang_at_least(compiler, '>=17.0.0', None) or
+                     compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=14.0.0'))
         has_c18 = (compiler.get_id() not in {'clang', 'gcc'} or
                    compiler.get_id() == 'clang' and _clang_at_least(compiler, '>=8.0.0', '>=11.0') or
                    compiler.get_id() == 'gcc' and version_compare(compiler.version, '>=8.0.0'))
@@ -533,6 +542,12 @@ class LinuxlikeTests(BasePlatformTests):
                 continue
             elif '++20' in v and not has_cpp20:
                 continue
+            elif '++2b' in v and not has_cpp2b:
+                continue
+            elif '++23' in v and not has_cpp23:
+                continue
+            elif ('++26' in v or '++2c' in v) and not has_cpp26:
+                continue
             # now C
             elif '17' in v and not has_cpp2a_c17:
                 continue