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ccroot: optional deduplication of command line flags.

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Introduce a global variable in ccroot called prune_flags.
If set to "True", only the last repetition of each flag
will be left in the command line.
This commit is contained in:
Krzysztof Kosiński 2014-01-27 04:46:14 +01:00
parent 8147d0a18b
commit 1e92b72aa6
1 changed files with 18 additions and 0 deletions
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18
waflib/Tools/ccroot.py
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@ -13,6 +13,12 @@ from waflib.TaskGen import after_method, before_method, feature, taskgen_method,
from waflib.Tools import c_aliases, c_preproc, c_config, c_osx, c_tests
from waflib.Configure import conf
prune_flags = False
"""
Boolean specifying whether only one instance of a given compiler flag
should be left in the command line.
"""
SYSTEM_LIB_PATHS = ['/usr/lib64', '/usr/lib', '/usr/local/lib64', '/usr/local/lib']
USELIB_VARS = Utils.defaultdict(set)
@ -420,6 +426,18 @@ def propagate_uselib_vars(self):
for v in _vars:
env.append_value(v, env[v + '_' + x])
# remove redundant values, leaving only the last instance of a flag
# leaving only the last flag is important for static libraries which depend on each other
if prune_flags:
for v in _vars:
uniqued = []
seen = set()
for a in reversed(env[v]):
if a not in seen:
seen.add(a)
uniqued.append(a)
env[v] = list(reversed(uniqued))
# ============ the code above must not know anything about import libs ==========
@feature('cshlib', 'cxxshlib', 'fcshlib')