external packages: redirect stderr too (#18037)

var/spack/repos/builtin/packages/automake/package.py

@@ -28,7 +28,7 @@ class Automake(AutotoolsPackage, GNUMirrorPackage):
 
     @classmethod
     def determine_version(cls, exe):
-        output = Executable(exe)('--version', output=str)
+        output = Executable(exe)('--version', output=str, error=str)
         match = re.search(r'GNU automake\)\s+(\S+)', output)
         return match.group(1) if match else None
 

var/spack/repos/builtin/packages/cmake/package.py

@@ -162,7 +162,7 @@ class Cmake(Package):
 
     @classmethod
     def determine_version(cls, exe):
-        output = Executable(exe)('--version', output=str)
+        output = Executable(exe)('--version', output=str, error=str)
         match = re.search(r'cmake.*version\s+(\S+)', output)
         return match.group(1) if match else None
 

var/spack/repos/builtin/packages/libtool/package.py

@@ -3,7 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-import os
 import re
 
 
@@ -35,7 +34,7 @@ class Libtool(AutotoolsPackage, GNUMirrorPackage):
 
     @classmethod
     def determine_version(cls, exe):
-        output = Executable(exe)('--version', output=str, error=os.devnull)
+        output = Executable(exe)('--version', output=str, error=str)
         match = re.search(r'\(GNU libtool\)\s+(\S+)', output)
         return match.group(1) if match else None
 

var/spack/repos/builtin/packages/openssl/package.py

@@ -80,7 +80,7 @@ class Openssl(Package):   # Uses Fake Autotools, should subclass Package
 
     @classmethod
     def determine_version(cls, exe):
-        output = Executable(exe)('version', output=str)
+        output = Executable(exe)('version', output=str, error=str)
         match = re.search(r'OpenSSL.(\S+)*', output)
         return match.group(1) if match else None
 

var/spack/repos/builtin/packages/perl/package.py

@@ -99,7 +99,7 @@ class Perl(Package):  # Perl doesn't use Autotools, it should subclass Package
     @classmethod
     def determine_version(cls, exe):
         perl = spack.util.executable.Executable(exe)
-        output = perl('--version', output=str)
+        output = perl('--version', output=str, error=str)
         if output:
             match = re.search(r'perl.*\(v([0-9.]+)\)', output)
             if match:
@@ -110,7 +110,7 @@ def determine_version(cls, exe):
     def determine_variants(cls, exes, version):
         for exe in exes:
             perl = spack.util.executable.Executable(exe)
-            output = perl('-V', output=str)
+            output = perl('-V', output=str, error=str)
             variants = ''
             if output:
                 match = re.search(r'-Duseshrplib', output)