So, is this a feature we want?


Julius Stroffek wrote:
> Tom Lane wrote:
> > This patch seems broken in a number of ways.  Why are you removing
> > -DLINUX_PROFILE, for example?  Are you sure you don't need -D_GNU_SOURCE?
> > And why add -DSUNOS4_CC, which is a Solaris-specific define (not that
> > we seem to be using it anywhere anymore)?  Do we really have to have a
> > configure-time probe to detect this particular compiler?
> >   
> You are right, removing -DLINUX_PROFILE seems to break profiling
> on linux when compiled with sun studio.
> I am not quite sure about the desired usage of _GNU_SOURCE and SUNOS4_CC 
> macros.
> I would not expect _GNU_SOURCE to be defined when compiling sources with 
> Sun Studio.
> I am not quite sure why SUNOS4_CC was supposed to be defined at all for 
> Solaris as well.
> There are already enough macros defined -- "__sun" is defined on Solaris 
> by both Sun
> Studio and gcc and "__SUNPRO_C" is defined by Sun Studio on both Linux 
> and Solaris.
> Should we then remove _GNU_SOURCE and SUNOS4_CC macro definitions from
> the build scripts since they are not used at all in the source code?
> Configure-time probe for sun studio is required to create tas.s link to 
> the proper
> file - sunstudio_x86.s (or sunstudio_sparc.s). This is done during a run 
> of a configure
> script based on settings for the platform. Since these settings may vary 
> on the same platform
> based on the compiler we need to have a configure-time probe.
> > But I guess the *real* question is why anyone would care ... what
> > benefit is there to using Sun's compiler on Linux?
> >   
> Some tools bundled with sun studio might be used. I personally run into this
> when I wanted to debug postgres with sun studio ide and wanted to compile
> it first. It is based on netbeans, written in java so it needs a big 
> enough memory,
> however it offers a great possibility to explore postgres internals during
> a query execution, etc. It is especially useful, if you do not know what 
> you are
> interested in during a compilation. I am using this to step over join 
> order search
> plugins. I mostly use Solaris for this but I switched to linux for a while.
> I wrote a blog with more details about this.
> There is also a screenshot showing how it looks in action
> Also, there was some message a while back on pgsql-bugs from Len Zaifman 
> requesting
> this as well.
> Cheers
> Julo
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