New submission from Michael Felt <aixto...@felt.demon.nl>:
while researching issue11191 I cam across 6 additional errors.
There is a test in Lib/test/support/__init__.py
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]
The "elif cmd is None:" is not successful because cmd maybe '' (null string)
Initially I thought to change to
"elif cmd is None or (not cmd):" but I hope I found a better resolution!
In: Lib/distutils/sysconfig.py the final bits of customize_compiler is:
compiler.set_executables(
preprocessor=cpp,
compiler=cc_cmd,
compiler_so=cc_cmd + ' ' + ccshared,
compiler_cxx=cxx,
linker_so=ldshared,
linker_exe=cc,
archiver=archiver)
the value for cxx come from os.environ, if set, otherwise it comes from
get_sys_vars()
(cc, cxx, opt, cflags, ccshared, ldshared, shlib_suffix, ar, ar_flags)
= \
get_config_vars('CC', 'CXX', 'OPT', 'CFLAGS',
'CCSHARED', 'LDSHARED', 'SHLIB_SUFFIX', 'AR',
'ARFLAGS')
If, during the build, CXX was not set - this sets cxx to the null string ('').
So the fix is to assign cxx = None when len(cxx) == 0
if 'CXX' in os.environ:
cxx = os.environ['CXX']
if not len(cxx):
cxx = None
While this only seems to happen for cxx - maybe this should be extended to all
the variables in (cc, cxx, opt, cflags, ccshared, ldshared, shlib_suffix, ar,
ar_flags)?
So, ultimately - I choose to go with changing : compiler.set_executables()
diff --git a/Lib/distutils/ccompiler.py b/Lib/distutils/ccompiler.py
index b71d1d39bc..2e08c4abd2 100644
--- a/Lib/distutils/ccompiler.py
+++ b/Lib/distutils/ccompiler.py
@@ -148,7 +148,7 @@ class CCompiler:
if key not in self.executables:
raise ValueError("unknown executable '%s' for class %s" %
(key, self.__class__.__name__))
- self.set_executable(key, kwargs[key])
+ self.set_executable(key, kwargs[key] if len(kwargs[key]) else None)
def set_executable(self, key, value):
if isinstance(value, str):
Was:
======================================================================
ERROR: test_run (distutils.tests.test_build_clib.BuildCLibTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/data/prj/python/git/python3-3.8/Lib/distutils/tests/test_build_clib.py", line
121, in test_run
ccmd = missing_compiler_executable()
File "/data/prj/python/git/python3-3.8/Lib/test/support/__init__.py", line
2730, in missing_compiler_executable
if spawn.find_executable(cmd[0]) is None:
IndexError: list index out of range
======================================================================
ERROR: test_build_ext (distutils.tests.test_build_ext.BuildExtTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/data/prj/python/git/python3-3.8/Lib/distutils/tests/test_build_ext.py", line
62, in test_build_ext
cmd = support.missing_compiler_executable()
File "/data/prj/python/git/python3-3.8/Lib/test/support/__init__.py", line
2730, in missing_compiler_executable
if spawn.find_executable(cmd[0]) is None:
IndexError: list index out of range
======================================================================
ERROR: test_get_outputs (distutils.tests.test_build_ext.BuildExtTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/data/prj/python/git/python3-3.8/Lib/distutils/tests/test_build_ext.py", line
308, in test_get_outputs
cmd = support.missing_compiler_executable()
File "/data/prj/python/git/python3-3.8/Lib/test/support/__init__.py", line
2730, in missing_compiler_executable
if spawn.find_executable(cmd[0]) is None:
IndexError: list index out of range
======================================================================
ERROR: test_build_ext (distutils.tests.test_build_ext.ParallelBuildExtTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/data/prj/python/git/python3-3.8/Lib/distutils/tests/test_build_ext.py", line
62, in test_build_ext
cmd = support.missing_compiler_executable()
File "/data/prj/python/git/python3-3.8/Lib/test/support/__init__.py", line
2730, in missing_compiler_executable
if spawn.find_executable(cmd[0]) is None:
IndexError: list index out of range
======================================================================
ERROR: test_get_outputs
(distutils.tests.test_build_ext.ParallelBuildExtTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/data/prj/python/git/python3-3.8/Lib/distutils/tests/test_build_ext.py", line
308, in test_get_outputs
cmd = support.missing_compiler_executable()
File "/data/prj/python/git/python3-3.8/Lib/test/support/__init__.py", line
2730, in missing_compiler_executable
if spawn.find_executable(cmd[0]) is None:
IndexError: list index out of range
======================================================================
ERROR: test_record_extensions (distutils.tests.test_install.InstallTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/data/prj/python/git/python3-3.8/Lib/distutils/tests/test_install.py",
line 200, in test_record_extensions
cmd = test_support.missing_compiler_executable()
File "/data/prj/python/git/python3-3.8/Lib/test/support/__init__.py", line
2730, in missing_compiler_executable
if spawn.find_executable(cmd[0]) is None:
IndexError: list index out of range
----------
components: Distutils
messages: 327083
nosy: Michael.Felt, dstufft, eric.araujo
priority: normal
severity: normal
status: open
title: distutils test errors when CXX is not set
type: behavior
versions: Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34897>
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