[Scons-users] Having issue with scanner in Command()

[Jason Kenny]

Hi,

I am setting up a build with SCons that has to build openssl. I am using the Command() logic to call the native build system. I am having an issue with this code wanting to rebuild because of a file "crypto/buildinf.h" is rebuilt as part of the process with a new date value/ This causes SCons to say stuff needs to be rebuilt. The issue here is an odd circular reference that is forming up and I am unclear on what is adding it at this time. I am hoping before I dig to deep into this that some one might know, or have some idea on what is happening. Details

I have a two commands:

out = env.Command(
["Makefile"],
copyed,
"cd ${TARGET.dir} ; ./Configure -DSSL_ALLOW_ADH enable-ec_nistp_64_gcc_128\
--prefix=${ABSPATH('#_makeinstall')}/${PART_NAME}\
--openssldir=${ABSPATH('#_makeinstall')}/${PART_NAME} linux-x86_64 shared\
"
)

Then I have a command
env.Ignore(out, ["crypto/buildinf.h"])

env.Command(
[
env.File("crypto/buildinf.h"),
"#_makeinstall/${PART_NAME}/bin/c_rehash",
...
],
["Makefile"],
[
"cd ${{SOURCE.dir}} ; make all CC=${{CC}} CXX=${{CXX}} $(-j{jobs}$)".format(jobs=env.GetOption('num_jobs')),
"cd ${SOURCE.dir} ; make install"
] )

What is happening is that after the first run Scons will tell me it needs to rebuild because:

scons: rebuilding `_build/build_debug_posix-x86_64/openssl/Makefile' because `_build/build_debug_posix-x86_64/openssl/crypto/buildinf.h' changed

I have an Ignore line that should remove this... What is odd for me is that the next build command is run because:
scons: rebuilding `_build/build_debug_posix-x86_64/openssl/crypto/buildinf.h' because `_build/build_debug_posix-x86_64/openssl/Makefile' changed

I seem to have a cycle of some kind. I am unclear on how to break it.

I am unclear on what scanner is adding this depends in Command. Do we have a generic Makefile scanner??
Any thoughts??

Jason

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