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Add configure infrastructure to detect support for C99's restrict.

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Will be used in later commits improving performance for a few key
routines where information about aliasing allows for significantly
better code generation.

This allows to use the C99 'restrict' keyword without breaking C89, or
for that matter C++, compilers. If not supported it's defined to be
empty.

Author: Andres Freund
Discussion: https://postgr.es/m/20170914063418.sckdzgjfrsbekae4@alap3.anarazel.de
This commit is contained in:
Andres Freund
2017-10-11 16:01:52 -07:00
parent 5fa6b0d102
commit 0b974dba2d
4 changed files with 72 additions and 0 deletions
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configure.in
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@ -1299,6 +1299,7 @@ fi
m4_defun([AC_PROG_CC_STDC], []) dnl We don't want that.
AC_C_BIGENDIAN
AC_C_INLINE
AC_C_RESTRICT
PGAC_PRINTF_ARCHETYPE
AC_C_FLEXIBLE_ARRAY_MEMBER
PGAC_C_SIGNED