Fwd: Re: Turn on compiler warnings by default for AC_PROG_CC, AC_PROG_CXX & AC_PROG_FC

[Dale Visser]

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Nick:


On 04/10/2014 04:19 PM, you wrote:
> Can you explain exactly which flags are (attempted to be) enabled by default? I see the following in
> a comment in the patch: "For the GNU compiler it will be -Wall (and
> -ansi -pedantic)" If that comment is correct... this means that the
> script will by default put GCC into strict C89 conformance mode. Not the
> best default choice, especially since AC_PROG_CC is supposed to select
> the most recent available mode AND to prefer extended modes over strict
> conformance ones. Cheers,

You found a mistake in the code comments that were brought over with
this code from Autoconf Archive.

Lines 466 through 473 specify the options to be enabled. The option
before the '%' character is used to detect which type of compiler we're
dealing with. The options(s) after define the options to use when
compiling. To answer your specific question about GCC, only '-Wall' gets
used to compile.

Best regards,
Dale
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