From 05927a66a778a8a58ac794e0239d076acb30a6a3 Mon Sep 17 00:00:00 2001
From: Michael Osthege <m.osthege@fz-juelich.de>
Date: Sat, 9 Jul 2022 18:40:02 +0200
Subject: BUG: Use `Popen` to silently invoke f77 -v

The output analyzed by this function unexpectedly ended up in stderr.

Closes #21942
---
 numpy/distutils/fcompiler/gnu.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'numpy/distutils')

diff --git a/numpy/distutils/fcompiler/gnu.py b/numpy/distutils/fcompiler/gnu.py
index d8143328e..cdb6aef94 100644
--- a/numpy/distutils/fcompiler/gnu.py
+++ b/numpy/distutils/fcompiler/gnu.py
@@ -382,7 +382,13 @@ class Gnu95FCompiler(GnuFCompiler):
 
     def get_target(self):
         try:
-            output = subprocess.check_output(self.compiler_f77 + ['-v'])
+            p = subprocess.Popen(
+                self.compiler_f77 + ['-v'],
+                stdin=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            )
+            stdout, stderr = p.communicate()
+            output = (stdout or b"") + (stderr or b"")
         except (OSError, subprocess.CalledProcessError):
             pass
         else:
-- 
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