Re: string manipulation : removing a part of a string

[Vincent Torri]

On Fri, 15 Jun 2012, Eric Blake wrote:

> On 06/15/2012 04:55 PM, Vincent Torri wrote:

> > AC_DEFUN([EFL_CHECK_COMPILER_FLAG],
> > [
> > m4_pushdef([UPEFL], m4_translit([[$1]], [-a-z], [_A-Z]))
> > m4_pushdef([UP], m4_translit([[$2]], [-a-z], [_A-Z]))
> >
> > m4_if(m4_index([$2], [-Wno-]), [0], [m4_pushdef([flagm4],
> > [m4_bpatsubst([[$2]], [no-])])], [m4_pushdef([flagm4], [$2])])
>
> option=m4_bpatsubst([[$2]], [no-])

Actually, i want to store in option -Wfoo if $2 is -Wno-foo, and only that 
case. It's for testing if a compiler option is available (after discussion 
with gcc guys, -Wno-foo use produces a warning while -Wfoo use produces an 
error). So if I pass -fno-bar, option will store -fbar, which is not what 
I want. So I guess that I have to use the m4_if construction.

Vincent Torri