Re: CC and CFLAGS are ignored by part of the build

[Patrice Dumas]

On Tue, Nov 14, 2023 at 04:23:58AM +0100, Bruno Haible wrote:
> Hi,
> 
> Apparently some optimization options were still in effect. And indeed,
> the file tp/Texinfo/XS/config.status contains these lines:
> 
> S["PERL_CONF_optimize"]="-O2 -g"
> 
> Per the GNU Coding Standards [1], when I specify CC and CFLAGS, it should
> override the package's defaults.
> 
> I understand that perl comes with its own installation and that building
> code that can be dynamically loaded by perl can be challenging. But the
> CC and CFLAGS values that I have specified are ABI-compatible with
> the ones that perl wants. Therefore I expect them to be obeyed.

There may be two issues here.  One is that in Texinfo/XS the following
variables replace the usual ones, to be able to specify something
different for the info program and the perl XS modules:
PERL_EXT_CFLAGS
PERL_EXT_CPPFLAGS
PERL_EXT_LDFLAGS
PERL_EXT_CC

The other is that PERL_CONF_optimize is used for AM_CFLAGS
(XSLIBS_CFLAGS in the development version), the objective being that the
same flags as those used to build perl are used for perl XS modules.  I
guess that these flags could be overriden by setting another flag, but
will still be on the command line.  In the development version
XSLIBS_CFLAGS is only used to compile C perl (mostly), most of the 'pure
C' code does not use this variable, but still use PERL_EXT_*.

-- 
Pat