Commit 7ee7b487 authored by Christoph Groth's avatar Christoph Groth
Browse files

setup.py: only create empty build.conf when actually building

parent 2b15f59e
......@@ -55,6 +55,14 @@ kwant_dir = os.path.dirname(os.path.abspath(__file__))
class kwant_build_ext(build_ext):
def run(self):
if not config_file_present:
# Create an empty config file if none is present so that the
# extensions will not be rebuilt each time. Only depending on the
# config file if it is present would make it impossible to detect a
# necessary rebuild due to a deleted config file.
with open(CONFIG_FILE, 'w') as f:
f.write('# Created by setup.py - feel free to modify.\n')
try:
build_ext.run(self)
except (DistutilsError, CCompilerError):
......@@ -283,7 +291,7 @@ def extensions():
Extension. possibly after replacing ".pyx" with ".c" if Cython is not to be
used."""
global build_summary
global build_summary, config_file_present
build_summary = []
#### Add components of Kwant without external compile-time dependencies.
......@@ -313,8 +321,9 @@ def extensions():
with open(CONFIG_FILE) as f:
config.readfp(f)
except IOError:
with open(CONFIG_FILE, 'w') as f:
f.write('# Created by setup.py - feel free to modify.\n')
config_file_present = False
else:
config_file_present = True
kwrds_by_section = {}
for section in config.sections():
......
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