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Date: Wed, 18 Feb 2015 12:17:00 -0000
From: Jakub Jelinek
To: Marek Polacek
Cc: GCC Patches
Subject: Re: [wwwdocs] Porting to again
Message-ID: <20150218121655.GK1746@tucnak.redhat.com>
Reply-To: Jakub Jelinek
References: <20150218120430.GX23138@redhat.com>
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On Wed, Feb 18, 2015 at 01:04:30PM +0100, Marek Polacek wrote:
> --- porting_to.html 10 Feb 2015 11:12:20 -0000 1.3
> +++ porting_to.html 18 Feb 2015 12:01:50 -0000
> @@ -24,6 +24,17 @@
> manner. Additions and suggestions for improvement are welcome.
>
>
> +Preprocessor issues
> +
> +The preprocessor started to emit line markers to properly distinguish
> +whether a macro token comes from a system header, or from a normal header
> +(see PR60723).
> +These new markers can cause intriguing problems, if the packages aren't ready
> +to handle them. To stop the preprocessor from generating the #line
> +directives, use the -P
option, documented
> +here.
> +
I think it would be nice to give here some example, like:
#include
exitfailure EXIT_FAILURE
and showing that older gcc -E used to emit
# 2 "test.c" 2
exitfailure 1
whereas GCC 5 emits:
# 2 "test.c" 2
# 2 "test.c"
exitfailure
# 2 "test.c" 3 4
1
and thus it can break simple tools that expect the tokens on a single line.
Otherwise, LGTM.
Jakub