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| author | Andres Freund <andres@anarazel.de> | 2017-10-11 16:01:52 -0700 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2017-10-11 16:01:52 -0700 |
| commit | 0b974dba2d6b5581ce422ed883209de46f313fb6 (patch) | |
| tree | 06b01bcde101a73e3211b5930ea3e259b4c3c134 /src | |
| parent | 5fa6b0d102eb8ccd15c4963ee9841baec50df45e (diff) | |
| download | postgresql-0b974dba2d6b5581ce422ed883209de46f313fb6.tar.gz postgresql-0b974dba2d6b5581ce422ed883209de46f313fb6.zip | |
Add configure infrastructure to detect support for C99's restrict.
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
Diffstat (limited to 'src')
| -rw-r--r-- | src/include/pg_config.h.in | 14 | ||||
| -rw-r--r-- | src/include/pg_config.h.win32 | 11 |
2 files changed, 25 insertions, 0 deletions
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in index b0298cca19c..80ee37dd622 100644 --- a/src/include/pg_config.h.in +++ b/src/include/pg_config.h.in @@ -923,6 +923,20 @@ if such a type exists, and if the system does not define it. */ #undef intptr_t +/* Define to the equivalent of the C99 'restrict' keyword, or to + nothing if this is not supported. Do not define if restrict is + supported directly. */ +#undef restrict +/* Work around a bug in Sun C++: it does not support _Restrict or + __restrict__, even though the corresponding Sun C compiler ends up with + "#define restrict _Restrict" or "#define restrict __restrict__" in the + previous line. Perhaps some future version of Sun C++ will work with + restrict; if so, hopefully it defines __RESTRICT like Sun C does. */ +#if defined __SUNPRO_CC && !defined __RESTRICT +# define _Restrict +# define __restrict__ +#endif + /* Define to empty if the C compiler does not understand signed types. */ #undef signed diff --git a/src/include/pg_config.h.win32 b/src/include/pg_config.h.win32 index b76aad02676..3be1c235aaa 100644 --- a/src/include/pg_config.h.win32 +++ b/src/include/pg_config.h.win32 @@ -681,6 +681,17 @@ #define inline __inline #endif +/* Define to the equivalent of the C99 'restrict' keyword, or to + nothing if this is not supported. Do not define if restrict is + supported directly. */ +/* Visual Studio 2008 and upwards */ +#if (_MSC_VER >= 1500) +/* works for C and C++ in msvc */ +#define restrict __restrict +#else +#define restrict +#endif + /* Define to empty if the C compiler does not understand signed types. */ /* #undef signed */ |