How to clear scons cache? CheckLibWithHeader returns "no" first time called, "yes" second time -



How to clear scons cache? CheckLibWithHeader returns "no" first time called, "yes" second time -

i have sconstruct file checking google protobuf library, so:

main['have_protobuf'] = main['protoc'] , \ conf.checklibwithheader('protobuf', 'google/protobuf/message.h', 'c++', 'google_protobuf_verify_version;')

i noticed phone call checklibwithheader returning "no". doing debugging of script, , became apparent me subsequent identical calls checklibwithheader returned "yes". when set identical line in sconstruct file next 1 above, output follows:

. . . checking accept(0,0,0) in c++ library none... (cached) yes checking zlibversion() in c++ library z... (cached) yes checking google_protobuf_verify_version in c++ library protobuf... (cached) no checking google_protobuf_verify_version in c++ library protobuf... (cached) yes checking clock_nanosleep(0,0,null,null) in c library none... no checking clock_nanosleep(0,0,null,null) in c library rt... yes . . .

i have protobuf libraries. know why first phone call checklibwithheader returning "no"?

this problem me occurs in centos, not in ubuntu.

update: no longer able reproduce above problem. however, have found when run problem scons using value marked "(cached)" appears incorrect, can 2 things help solution. i'll set these in reply below.

the --config=force command line alternative should re-run configuration tests without looking @ cached results. according man page scons:

--config=force if alternative specified, configuration tests re-run regardless of whether cached results out of date. can used explicitly forcefulness configuration tests updated in response otherwise unconfigured alter in scheme header file or compiler.

scons

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