Merge pull request #15921 from mattip/use-sysconfig

ENH: Use sysconfig instead of probing Makefile

1 files changed, 8 insertions, 17 deletions

diff --git a/numpy/distutils/fcompiler/gnu.py b/numpy/distutils/fcompiler/gnu.py
index 8d69f6ba6..796dff351 100644
--- a/numpy/distutils/fcompiler/gnu.py
+++ b/numpy/distutils/fcompiler/gnu.py
@@ -122,26 +122,17 @@ class GnuFCompiler(FCompiler):
             # error checking.
             if not target:
                 # If MACOSX_DEPLOYMENT_TARGET is not set in the environment,
-                # we try to get it first from the Python Makefile and then we
-                # fall back to setting it to 10.3 to maximize the set of
-                # versions we can work with.  This is a reasonable default
+                # we try to get it first from sysconfig and then
+                # fall back to setting it to 10.9 This is a reasonable default
                 # even when using the official Python dist and those derived
                 # from it.
-                import distutils.sysconfig as sc
-                g = {}
-                try:
-                    get_makefile_filename = sc.get_makefile_filename
-                except AttributeError:
-                    pass  # i.e. PyPy
-                else:
-                    filename = get_makefile_filename()
-                    sc.parse_makefile(filename, g)
-                target = g.get('MACOSX_DEPLOYMENT_TARGET', '10.3')
-                os.environ['MACOSX_DEPLOYMENT_TARGET'] = target
-                if target == '10.3':
-                    s = 'Env. variable MACOSX_DEPLOYMENT_TARGET set to 10.3'
+                import sysconfig
+                target = sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET')
+                if not target:
+                    target = '10.9'
+                    s = f'Env. variable MACOSX_DEPLOYMENT_TARGET set to {target}'
                     warnings.warn(s, stacklevel=2)
-
+                os.environ['MACOSX_DEPLOYMENT_TARGET'] = target
             opt.extend(['-undefined', 'dynamic_lookup', '-bundle'])
         else:
             opt.append("-shared")