CODEWITHSUNDEEP
autotools
Ferenc Deak
Ferenc Deak

Reputation: 35408

Autotools: flags for specific sub directory

In our C project which is managed by autotools we have the following (high level) directory structure:

<project>
 +--- configure.ac    1024 bytes
 +--- Makefile.am     1024 bytes
 +--- include         <DIR>
   +--- Makefile.am   1023 bytes
 +---source           <DIR>
   +--- Makefile.am   1022 bytes
 +--- 3rdparty        <DIR>
   +--- Makefile.am   1021 bytes

The 3rdparty directory contains source code which is not written by us, but regardless is compiled and linked into the main application. Unfortunately this directory contains a lot of compile time warnings, we don't want to fix.

How can I disable the warnings (with the -w flag) for all source files in the 3rdparty and its sub-directories?

Upvotes: 1

Views: 185

Answers (1)

therealneil
therealneil

Reputation: 5300

@fritzone, to disable warnings in a third-party project is difficult. To ignore those warnings while using much stricter compiler flags in your own project can be done like this:

https://github.com/rubicks/autotool-subdirs

tldr; 3rdparty/Makefile.am uses default warnings; src/Makefile.am uses really strict warnings (treated as errors) and uses -isystem (rather than -I) to add the 3rdparty inclusion path.

The project should look familiar:

.
├── 3rdparty
│   ├── Makefile.am
│   ├── third.c
│   └── third.h
├── Makefile.am
├── autosub-top.h
├── configure.ac
├── include
│   ├── Makefile.am
│   └── autosub.h
└── src
    ├── Makefile.am
    ├── autosub.c
    └── prog.c

3rdparty/third.h contains warn-able stuff like

static const size_t answer = -42;

which is included by src/autosub.c. src/Makefile.am compiles src/autosub.c with

AM_CFLAGS =        \
  -Wall            \
  -Wconversion     \
  -Werror          \
  -Wextra          \
  -pedantic-errors \
  -std=c99

and links in libthird.la

Upvotes: 1

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