2012/2/18 Torbjörn Svensson
<address@hidden>
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Hello list,
The short version
Is there any way to make make dump it's database to a makefile and
then reuse that dumped makefile to build the source?
The long version
In one of our projects at work, we use a rather complex set of
macros[1] to make it easier for the developers to define how a
component is to be built. The developer creates a file called
'makerules.mk' and enters data into a few predefined variable names,
like $(component1_SRCS), $(component1_INCL), $(component1_LIBS) where
"component1" is the name of the resulting executable of library. When
invoking make, the macros are expanded based on the data in those
variables to a set of rules and then make just does it's magic on
those. As the source code usually is put in a tree, the number of
makerules.mk files that the developers are entering data into can be
rather large and as a result, the part of the build process that
expands the macros takes a lot of time. For example, for one of our
components, the expansion takes roughly 40 seconds even as there is
nothing to left to do.
To save some time, I'm now thinking that our build process could be
divided into a few stages.
Stage 1
Verify the timestamps on each and every makerules.mk file and if any
of the timestamps is newer than the complete makefile, it needs to be
regenerated.
Possible way to implement: Could be resolved with another temporary
makefile that just sets the complete makefile as target and have all
the makerules.mk files as dependencies.
Stage 2
Generate the complete makefile and expand all the macros.
Possible way to implement: The option -p sounds interesting. The
problem with -p is that the dumped database also includes -p in MFLAGS
and MAKEFLAGS so it's not possible to just invoke make on the complete
makefile without first stripping of this option. At first glans, I
would like an option like -p but it should not be added to the dumped
database, but I'm a bit worried that not adding it there would screw
up recursive make. I also would like the option to print to a file
rather than stdout as stdout could be used in the makefile that you
build and thus make will be confused if invoked on the dumped file.
Stage 3
Execute make on the complete makefile.
To sum up this question, is it possible to do this without patching
make? If not, is it something that you would be interested in
including in an official version of make?
Thank you in advance.
// Torbjörn
[1] http://gitorious.org/bobuild/bob/trees/master
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