Fix #79532: sizeof off_t can be wrong

[cmb69]

We have to actually determine the proper SIZEOF_OFF_T.

[nikic]

Added test fails on travis.

[cmb69]

Thanks! Should be fixed now.

[cmb69]

Any idea what to do about https://dev.azure.com/phpazuredevops/PHP/_build/results?buildId=7132&view=logs&j=d08b4992-9a38-5fb7-07af-0ddc5109f80d&t=6e062e06-e501-5814-49ff-f393cbd7d294&l=32 ?

[nikic]

@cmb69 Including pg_config.h seems super fishy. It looks like libpq supports PQlibVersion() since 9.1, we should switch to using that instead of PG_VERSION.

[cmb69]

ACK. However, while we could construct PGSQL_LIBPQ_VERSION (a string) from PQlibVersion(), we cannot construct PGSQL_LIBPQ_VERSION_STR, which is documented as "Long libpq version that includes compiler information." (e.g. "PostgreSQL 11.4, compiled by Visual C++" ", 64-bit"). IOW, that is a (minor) BC break.

[nikic]

@cmb69 For now, please add an #undef SIZEOF_OFF_T before the pg_config.h includes, we can deal with removing them in master.

[cmb69]

Okay, makes sense. I'll have a closer look at the PostgreSQL issue later.

[cmb69]

Thanks! Applied as 67f9b0b.