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Re: C++98/C++11 ABI compatibility for gcc-4.7
- From: Jakub Jelinek <jakub at redhat dot com>
- To: PaweÅ Sikora <pluto at agmk dot net>
- Cc: gcc at gcc dot gnu dot org, Jonathan Wakely <jwakely dot gcc at gmail dot com>, James Y Knight <foom at fuhm dot net>, jyasskin at googlers dot com
- Date: Fri, 15 Jun 2012 10:19:23 +0200
- Subject: Re: C++98/C++11 ABI compatibility for gcc-4.7
- References: <684e2daa82dfe58f3c0ca7898a646503.squirrel@fuhm.net> <CAH6eHdTEx0jgZWZJ8+RRhOEnD9zUXfLUPX30nhH8Zh6aYsE1Tg@mail.gmail.com> <CAH6eHdTMhoLvmoWZSCg3+1Gj1Z9p+EE=wwcvW86ubp9z9Ko3KQ@mail.gmail.com> <2194249.RI90jtvlYx@localhost>
- Reply-to: Jakub Jelinek <jakub at redhat dot com>
On Thu, Jun 14, 2012 at 10:33:11PM +0200, PaweÅ Sikora wrote:
> from the others side, someone can use -frecord-gcc-switches to detect mixed '-std=...'
> after final linking and report error in such cases.
I don't think -frecord-gcc-switches is useful for that, unless you always
specify explicit -std= option, because with -frecord-gcc-switches without
the default -std=gnu98 you get nothing in the note section, and as strings
are merged with this option, all you can find out is whether there was at
least one -std=c++11 or -std=gnu++0x etc. compiled object.
If you use -grecord-gcc-switches, you can investigate the command line
per translation unit (and find out which was it), of course for
this kind of detection you need to limit yourself to
DW_AT_language 4 and then look at DW_AT_producer...
Jakub