def check_config_h():
"""Check if the current Python installation (specifically, pyconfig.h)
appears amenable to building extensions with GCC. Returns a tuple
(status, details), where 'status' is one of the following constants:
CONFIG_H_OK
all is well, go ahead and compile
CONFIG_H_NOTOK
doesn't look good
CONFIG_H_UNCERTAIN
not sure -- unable to read pyconfig.h
'details' is a human-readable string explaining the situation.
Note there are two ways to conclude "OK": either 'sys.version' contains
the string "GCC" (implying that this Python was built with GCC), or the
installed "pyconfig.h" contains the string "__GNUC__".
"""
# XXX since this function also checks sys.version, it's not strictly a
# "pyconfig.h" check -- should probably be renamed...
from distutils import sysconfig
import string
# if sys.version contains GCC then python was compiled with
# GCC, and the pyconfig.h file should be OK
if string.find(sys.version,"GCC") >= 0:
return (CONFIG_H_OK, "sys.version mentions 'GCC'")
fn = sysconfig.get_config_h_filename()
try:
# It would probably better to read single lines to search.
# But we do this only once, and it is fast enough
f = open(fn)
try:
s = f.read()
finally:
f.close()
except IOError, exc:
# if we can't read this file, we cannot say it is wrong
# the compiler will complain later about this file as missing
return (CONFIG_H_UNCERTAIN,
"couldn't read '%s': %s" % (fn, exc.strerror))
else:
# "pyconfig.h" contains an "#ifdef __GNUC__" or something similar
if string.find(s,"__GNUC__") >= 0:
return (CONFIG_H_OK, "'%s' mentions '__GNUC__'" % fn)
else:
return (CONFIG_H_NOTOK, "'%s' does not mention '__GNUC__'" % fn)
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