Remove test dependency on /usr/bin/gcc (#11769)

The regression test for #11678 fails on at least some Mac OS systems
because they have a /usr/bin/gcc that is secretly clang.

This PR replaces the dependency on a system gcc executable with a
test-generated script that generates the expected output for the
compiler logic.

1 files changed, 10 insertions, 3 deletions

diff --git a/lib/spack/spack/test/cmd/compiler_command.py b/lib/spack/spack/test/cmd/compiler_command.py
index 042cb99484..e40e49544d 100644
--- a/lib/spack/spack/test/cmd/compiler_command.py
+++ b/lib/spack/spack/test/cmd/compiler_command.py
@@ -6,7 +6,6 @@
 import pytest
 
 import os
-import os.path
 
 import spack.main
 
@@ -26,8 +25,16 @@ def no_compilers_yaml(mutable_config, monkeypatch):
 
 
 @pytest.mark.regression('11678')
-@pytest.mark.requires_executables('/usr/bin/gcc')
-def test_compiler_find_without_paths(no_compilers_yaml):
+def test_compiler_find_without_paths(no_compilers_yaml, working_env, tmpdir):
+    with tmpdir.as_cwd():
+        with open('gcc', 'w') as f:
+            f.write("""\
+#!/bin/bash
+echo "0.0.0"
+""")
+        os.chmod('gcc', 0o700)
+
+    os.environ['PATH'] = str(tmpdir)
     output = compiler('find', '--scope=site')
 
     assert 'gcc' in output