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Asked: 2026-05-10T18:21:32+00:00

Is there a way set flags on a per-file basis with automake? In particular,

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Is there a way set flags on a per-file basis with automake?
In particular, if I have a c++ project and want to compile with -WAll all the files except one for which I want to disable a particular warning, what could I do?

I tried something like:

CXXFLAGS = -WAll ... bin_PROGRAMS = test test_SOURCES = main.cpp utility.cpp utility_o_CXXFLAGS = $(CXXFLAGS) -Wno-unused-value

but it didn’t work.

EDITED: removed reference to automake manual, which was actually misleading (thanks to Douglas Leeder).

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1 Answer

  1. Automake only supports per-target flags, while you want per-object flags. One way around is to create a small library that contains your object: 

    CXXFLAGS = -Wall ... bin_PROGRAMS = test test_SOURCES = main.cpp test_LDADD = libutility.a noinst_LIBRARIES = libutility.a libutility_a_SOURCES = utility.cpp libutility_a_CXXFLAGS = $(CXXFLAGS) -Wno-unused-value
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