Issue 26931: Merge 3.6

1 files changed, 26 insertions, 1 deletions

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 81136100f0..f10672383e 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -105,7 +105,7 @@ __all__ = [
     "check_warnings", "check_no_resource_warning", "EnvironmentVarGuard",
     "run_with_locale", "swap_item",
     "swap_attr", "Matcher", "set_memlimit", "SuppressCrashReport", "sortdict",
-    "run_with_tz", "PGO",
+    "run_with_tz", "PGO", "missing_compiler_executable",
     ]
 
 class Error(Exception):
@@ -2491,3 +2491,28 @@ def check_free_after_iterating(test, iter, cls, args=()):
     # The sequence should be deallocated just after the end of iterating
     gc_collect()
     test.assertTrue(done)
+
+
+def missing_compiler_executable(cmd_names=[]):
+    """Check if the compiler components used to build the interpreter exist.
+
+    Check for the existence of the compiler executables whose names are listed
+    in 'cmd_names' or all the compiler executables when 'cmd_names' is empty
+    and return the first missing executable or None when none is found
+    missing.
+
+    """
+    from distutils import ccompiler, sysconfig, spawn
+    compiler = ccompiler.new_compiler()
+    sysconfig.customize_compiler(compiler)
+    for name in compiler.executables:
+        if cmd_names and name not in cmd_names:
+            continue
+        cmd = getattr(compiler, name)
+        if cmd_names:
+            assert cmd is not None, \
+                    "the '%s' executable is not configured" % name
+        elif cmd is None:
+            continue
+        if spawn.find_executable(cmd[0]) is None:
+            return cmd[0]