Where to add a CFLAG, such as -std=gnu99, into an (Eclipse CDT) autotools project

Question

I have a simple Autotools C project (not C++), whose skeleton was created for me by Eclipse CDT (Juno).

CFLAGs (by inspection) seem to be -g -O2.

I want all of the generated make files to also have -std=gnu99 appended to the CFLAGs, because I use for (int i = 0; i < MAX; i++) and similar.

I can obviously hack the Makefile, but this gets overwritten on ./configure.

Where is the correct place to add (or change) CFLAGs which are required by the code (as opposed to those CFLAGs which the user might want to change)?

P.S. I'd like to do this by editing a text file (such as Makefile.am or configure.ac), rather than clicking a box in Eclipse, if possible.

score 5 · Answer 1 · edited Apr 03 '18 at 16:02

5

Just run into the same problem.

Here is the solution, just add the CFLAGS at the end of the configure options:

enter image description here

If you want to do this by editing configure.ac, just add CFLAGS="$CFLAGS something" into configure.ac

edited Apr 03 '18 at 16:02

basin

answered Apr 11 '13 at 12:12

Šimon Tóth

If added **CFLAGS="-std=gnu99"** and enabled CFLAGS check boxes like Debg(-g), Gprof support(-pg) then only CFLAGS="-std=gnu99"** is took as effective, ignoring other GUI enabled CFLAGS – Chandrayya G K Nov 14 '17 at 08:31

score 1 · Answer 2 · answered Jul 25 '12 at 06:12

1

If you mean to parameters for the compiler than see attached. (c++ build/setting/Misc enter image description here )

answered Jul 25 '12 at 06:12

Avihai Marchiano

On my machine, I have only the Binary Parsers and Error Parsers tabs. I also have an additional, greyed-out Configuration: 'Build (GNU) [ Active ]' drop down list, above those tabs. I downloaded "Eclipse IDE for C/C++ Developers, 143 MB" from http://www.eclipse.org/downloads/ a week ago. – fadedbee Jul 25 '12 at 09:39
I also created a brand-new project, and it still only has two tabs. – fadedbee Jul 25 '12 at 09:55
2

I just created a non-autotools project and it has all five tabs. I think your answer only applies to **non-autotools** projects, which is not the question. – fadedbee Jul 25 '12 at 10:11
This was useful for my cross-compiler c project. – Larry Mar 14 '17 at 00:08

score 0 · Answer 3 · answered May 01 '17 at 12:52

0

In Eclipse Neon CDT, you also have a "Dialect" setting as shown below:

answered May 01 '17 at 12:52

nagylzs

3 Answers3