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bug#44010: Per-compilation C files

From: Reuben Thomas
Subject: bug#44010: Per-compilation C files
Date: Thu, 15 Oct 2020 21:34:02 +0100

On Thu, 15 Oct 2020 at 13:06, Reuben Thomas <rrt@sc3d.org> wrote:
I've recently started using automake with Vala; it works very well! I'm particularly impressed that the "make dist" rules include the C files, so that the builder doesn't need a Vala compiler.

There's one nit: I want to make multiple .c files from the same .vala file, analogous to the way that you can make multiple .o files from the same .c file, and it doesn't seem to work: automake generates two sets of rules for the same .c file instead.

I just noticed that in fact there seems to be a bug (or at least something I don't understand how to use!) in the Vala rules. In my case that I mentioned before:

TESTS = estr
estr_SOURCES = estr.vala # so that automake doesn't try to just compile estr.c
estr_VALAFLAGS = …
estr_CPPFLAGS = …
estr_LDFLAGS = …

as well as

zile_SOURCE = … estr.vala …

estr.vala is used twice. This causes two Makefile rules for estr.c to be generated, which conflict. Importantly, they satisfy different stamp files, so they could cause the file not to be rebuilt for one target.

I guess I could work around this by building estr.vala into a library that is used by both its targets, but that seems a little convoluted; is there something I'm missing?


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