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Andres Freund 4d6ad31257 Provide overflow safe integer math inline functions.

It's not easy to get signed integer overflow checks correct and
fast. Therefore abstract the necessary infrastructure into a common
header providing addition, subtraction and multiplication for 16, 32,
64 bit signed integers.

The new macros aren't yet used, but a followup commit will convert
several open coded overflow checks.

Author: Andres Freund, with some code stolen from Greg Stark
Reviewed-By: Robert Haas
Discussion: https://postgr.es/m/20171024103954.ztmatprlglz3rwke@alap3.anarazel.de

2017-12-12 16:55:37 -08:00

ac_func_accept_argtypes.m4

Remove some configure header-file checks that we weren't really using.

2017-02-25 18:10:09 -05:00

ax_prog_perl_modules.m4

Make configure check for IPC::Run when --enable-tap-tests is specified.

2017-06-15 15:56:12 -04:00

ax_pthread.m4

Update ax_pthread.m4 to an experimental draft version from upstream.

2015-07-30 14:14:50 +03:00

c-compiler.m4

Provide overflow safe integer math inline functions.