[erlang-patches] Producing dependencies Makefile for Erlang using erlc(1)
Wed Oct 29 16:12:33 CET 2008
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When using erlc(1) and standard Makefiles to compile Erlang source
files, there's currently no way to track header dependencies. Thus, if a
header is modified, a module that depends on it will be recompiled only
if the dependency is explicitly indicated in the Makefile. This becomes
problematic when the header is external (for instance, a header from
another application, such as xmerl.hrl).
Attached is a patch that adds support for producing dependencies
Makefiles to erlc(1) and compiler(3). It was modeled after GCC.
For example, let's take the following module:
The command "erlc -M mod1.erl" will output:
mod1.beam: mod1.erl header1.hrl
The patch adds the following options to erlc(1) and compiler(3):
-M generate a rule describing dependencies; output on
-MF File rule(s) is(are) written to `File'.
-MT Target change the name of the rule emitted.
-MQ Target same as -MT but quote special characters for make(1).
-MG consider missing headers as generated files and add the
to the dependencies
-MP add a phony target for each dependency.
-MD same as -M -MT file.Pbeam
They're the same as GCC. The following options are not supported:
-MM ignore system headers
-MMD same as -MD but ignore system headers
I choose to keep the same names as GCC because I'm working on Erlang
support in Automake and it wants to use these options. Regarding
compiler(3), options could have a more Erlang-fashion name.
The patch, against R12B-4, includes the documentation updates. But I
don't know how to make it, so it's untested.
PS: I already sent an older patch to erlang-questions@ more than a year
ago. The attached patch obsoletes it.
PGP Key: http://www.dumbbell.fr/pgp/pubkey.asc
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