Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 5 Feb 2009 10:55:31 -0600

On Wed, 4 Feb 2009, Rod Nussbaumer wrote:
> I have some C code written elsewhere that I want to compile with the
> EPICS build system. The code has quite a bit of C++-style commenting in
> it, and gcc bails with complaints about such commnts, as the standard gcc
> commandline in EPICS includes the '-ansi' option. Is there any way to
> remove the -ansi option for this project only?

We normally override the compiler language setting using the CMPLR variable in 
a Makefile, so this switches to using the -traditional flag to gcc (which 
actually generated an error for me just now, showing that we don't use it any 
more):

	CMPLR = TRAD

You can define your own settings as well, like this:

	CMPLR = GNU99
	CONFORM_CFLAGS_GNU99 = -std=gnu99

Note that the CMPLR setting applies to all files built from this Makefile, but 
you can use a target-specific variable to change it when compiling a 
particular specific file <name>.c, like this (tested):

	<name>.o : CMPLR = GNU99

This will apply that flag for all architecture builds, which is fine if you 
only build using gcc architectures, but not much use if you have to support 
other compilers as well (but then they have to support that particular 
dialect of C anyhow, so maybe this isn't really an issue).

- Andrew
-- 
The best FOSS code is written to be read by other humans -- Harold Welte

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System