Re: [HACKERS] New s_lock.h fails on HPUX with gcc

> ... because the conditional structure assumes that pgsql will only be
> built with non-gcc compilers on HPUX.
>
> This is an entirely bogus assumption not only for HPUX, but for any
> other architecture that has gcc available.
>
> To be able to compile, I just duplicated the "#if defined(__hpux)"
> block into the "#if defined(__GNUC__)" part of the file, but that's
> a pretty grotty hack.  I think that the right way to structure the
> file is just this:
>
>
> #if defined(HAS_TEST_AND_SET)
>
> #if defined(somearchitecture)
>
> #if defined(__GNUC__)
> // inline definition of tas here
> #else
> // non-inline definition of tas here, if default isn't adequate
> #endif
>
> // machine-dependent-but-compiler-independent definitions here
>
> #endif /* somearchitecture */
>
> // ... repeat above structure for each architecture supported ...
>
>
> #if !defined(S_LOCK)
> // default definition of S_LOCK
> #endif
>
> // default definitions of other macros done in the same way
>
> #endif /* HAS_TEST_AND_SET */
>
>
> On architectures where we don't have any special inline code for GCC,
> the inner "#if defined(__GNUC__)" can just be omitted in that
> architecture's block.
>
> The existing arrangement with an outer "#if defined(__GNUC__)" doesn't
> have any obvious benefit, and it encourages missed cases like this one.
>
>
> BTW, I'd suggest making the definition of clear_lock for HPUX be
>
> static const slock_t clear_lock =
> {{-1, -1, -1, -1}};
>
> The extra braces are needed to suppress warnings from gcc, and declaring
> it const just seems like good practice.
>
>             regards, tom lane
>
>

Patch applied.  I just moved hpux out of the gcc/nogcc ifdef, so it
always gets hit.  Also changed the clear_lock stuff.

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