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8122e1437e
We will, for the foreseeable future, not expose 128 bit datatypes to SQL. But being able to use 128bit math will allow us, in a later patch, to use 128bit accumulators for some aggregates; leading to noticeable speedups over using numeric. So far we only detect a gcc/clang extension that supports 128bit math, but no 128bit literals, and no *printf support. We might want to expand this in the future to further compilers; if there are any that that provide similar support. Discussion: 544BB5F1.50709@proxel.se Author: Andreas Karlsson, with significant editorializing by me Reviewed-By: Peter Geoghegan, Oskari Saarenmaa
476 lines
17 KiB
Plaintext
476 lines
17 KiB
Plaintext
# Macros to detect C compiler features
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# config/c-compiler.m4
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# PGAC_C_SIGNED
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# -------------
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# Check if the C compiler understands signed types.
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AC_DEFUN([PGAC_C_SIGNED],
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[AC_CACHE_CHECK(for signed types, pgac_cv_c_signed,
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[AC_TRY_COMPILE([],
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[signed char c; signed short s; signed int i;],
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[pgac_cv_c_signed=yes],
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[pgac_cv_c_signed=no])])
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if test x"$pgac_cv_c_signed" = xno ; then
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AC_DEFINE(signed,, [Define to empty if the C compiler does not understand signed types.])
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fi])# PGAC_C_SIGNED
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# PGAC_C_INLINE
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# -------------
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# Check if the C compiler understands inline functions without being
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# noisy about unused static inline functions. Some older compilers
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# understand inline functions (as tested by AC_C_INLINE) but warn about
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# them if they aren't used in a translation unit.
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#
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# This test used to just define an inline function, but some compilers
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# (notably clang) got too smart and now warn about unused static
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# inline functions when defined inside a .c file, but not when defined
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# in an included header. Since the latter is what we want to use, test
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# to see if the warning appears when the function is in a header file.
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# Not pretty, but it works.
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#
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# Defines: inline, PG_USE_INLINE
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AC_DEFUN([PGAC_C_INLINE],
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[AC_C_INLINE
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AC_CACHE_CHECK([for quiet inline (no complaint if unreferenced)], pgac_cv_c_inline_quietly,
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[pgac_cv_c_inline_quietly=no
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if test "$ac_cv_c_inline" != no; then
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pgac_c_inline_save_werror=$ac_c_werror_flag
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ac_c_werror_flag=yes
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AC_LINK_IFELSE([AC_LANG_PROGRAM([#include "$srcdir/config/test_quiet_include.h"],[])],
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[pgac_cv_c_inline_quietly=yes])
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ac_c_werror_flag=$pgac_c_inline_save_werror
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fi])
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if test "$pgac_cv_c_inline_quietly" != no; then
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AC_DEFINE_UNQUOTED([PG_USE_INLINE], 1,
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[Define to 1 if "static inline" works without unwanted warnings from ]
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[compilations where static inline functions are defined but not called.])
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fi
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])# PGAC_C_INLINE
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# PGAC_C_PRINTF_ARCHETYPE
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# -----------------------
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# Set the format archetype used by gcc to check printf type functions. We
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# prefer "gnu_printf", which includes what glibc uses, such as %m for error
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# strings and %lld for 64 bit long longs. GCC 4.4 introduced it. It makes a
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# dramatic difference on Windows.
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AC_DEFUN([PGAC_PRINTF_ARCHETYPE],
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[AC_CACHE_CHECK([for printf format archetype], pgac_cv_printf_archetype,
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[ac_save_c_werror_flag=$ac_c_werror_flag
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ac_c_werror_flag=yes
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[extern int
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pgac_write(int ignore, const char *fmt,...)
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__attribute__((format(gnu_printf, 2, 3)));], [])],
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[pgac_cv_printf_archetype=gnu_printf],
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[pgac_cv_printf_archetype=printf])
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ac_c_werror_flag=$ac_save_c_werror_flag])
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AC_DEFINE_UNQUOTED([PG_PRINTF_ATTRIBUTE], [$pgac_cv_printf_archetype],
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[Define to gnu_printf if compiler supports it, else printf.])
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])# PGAC_PRINTF_ARCHETYPE
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# PGAC_TYPE_64BIT_INT(TYPE)
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# -------------------------
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# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
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# yes or no respectively, and define HAVE_TYPE_64 if yes.
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AC_DEFUN([PGAC_TYPE_64BIT_INT],
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[define([Ac_define], [translit([have_$1_64], [a-z *], [A-Z_P])])dnl
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define([Ac_cachevar], [translit([pgac_cv_type_$1_64], [ *], [_p])])dnl
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AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
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[AC_TRY_RUN(
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[typedef $1 ac_int64;
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/*
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* These are globals to discourage the compiler from folding all the
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* arithmetic tests down to compile-time constants.
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*/
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ac_int64 a = 20000001;
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ac_int64 b = 40000005;
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int does_int64_work()
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{
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ac_int64 c,d;
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if (sizeof(ac_int64) != 8)
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return 0; /* definitely not the right size */
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/* Do perfunctory checks to see if 64-bit arithmetic seems to work */
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c = a * b;
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d = (c + b) / b;
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if (d != a+1)
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return 0;
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return 1;
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}
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main() {
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exit(! does_int64_work());
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}],
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[Ac_cachevar=yes],
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[Ac_cachevar=no],
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[# If cross-compiling, check the size reported by the compiler and
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# trust that the arithmetic works.
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AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([], [sizeof($1) == 8])],
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Ac_cachevar=yes,
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Ac_cachevar=no)])])
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Ac_define=$Ac_cachevar
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if test x"$Ac_cachevar" = xyes ; then
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AC_DEFINE(Ac_define, 1, [Define to 1 if `]$1[' works and is 64 bits.])
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fi
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undefine([Ac_define])dnl
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undefine([Ac_cachevar])dnl
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])# PGAC_TYPE_64BIT_INT
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# PGAC_TYPE_128BIT_INT
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# ---------------------
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# Check if __int128 is a working 128 bit integer type, and if so
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# define PG_INT128_TYPE to that typename. This currently only detects
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# a GCC/clang extension, but support for different environments may be
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# added in the future.
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#
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# For the moment we only test for support for 128bit math; support for
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# 128bit literals and snprintf is not required.
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AC_DEFUN([PGAC_TYPE_128BIT_INT],
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[AC_CACHE_CHECK([for __int128], [pgac_cv__128bit_int],
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([
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/*
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* These are globals to discourage the compiler from folding all the
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* arithmetic tests down to compile-time constants. We do not have
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* convenient support for 64bit literals at this point...
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*/
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__int128 a = 48828125;
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__int128 b = 97656255;
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],[
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__int128 c,d;
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a = (a << 12) + 1; /* 200000000001 */
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b = (b << 12) + 5; /* 400000000005 */
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/* use the most relevant arithmetic ops */
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c = a * b;
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d = (c + b) / b;
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/* return different values, to prevent optimizations */
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if (d != a+1)
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return 0;
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return 1;
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])],
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[pgac_cv__128bit_int=yes],
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[pgac_cv__128bit_int=no])])
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if test x"$pgac_cv__128bit_int" = xyes ; then
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AC_DEFINE(PG_INT128_TYPE, __int128, [Define to the name of a signed 128-bit integer type.])
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fi])# PGAC_TYPE_128BIT_INT
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# PGAC_C_FUNCNAME_SUPPORT
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# -----------------------
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# Check if the C compiler understands __func__ (C99) or __FUNCTION__ (gcc).
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# Define HAVE_FUNCNAME__FUNC or HAVE_FUNCNAME__FUNCTION accordingly.
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AC_DEFUN([PGAC_C_FUNCNAME_SUPPORT],
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[AC_CACHE_CHECK(for __func__, pgac_cv_funcname_func_support,
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[AC_TRY_COMPILE([#include <stdio.h>],
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[printf("%s\n", __func__);],
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[pgac_cv_funcname_func_support=yes],
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[pgac_cv_funcname_func_support=no])])
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if test x"$pgac_cv_funcname_func_support" = xyes ; then
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AC_DEFINE(HAVE_FUNCNAME__FUNC, 1,
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[Define to 1 if your compiler understands __func__.])
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else
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AC_CACHE_CHECK(for __FUNCTION__, pgac_cv_funcname_function_support,
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[AC_TRY_COMPILE([#include <stdio.h>],
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[printf("%s\n", __FUNCTION__);],
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[pgac_cv_funcname_function_support=yes],
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[pgac_cv_funcname_function_support=no])])
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if test x"$pgac_cv_funcname_function_support" = xyes ; then
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AC_DEFINE(HAVE_FUNCNAME__FUNCTION, 1,
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[Define to 1 if your compiler understands __FUNCTION__.])
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fi
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fi])# PGAC_C_FUNCNAME_SUPPORT
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# PGAC_C_STATIC_ASSERT
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# --------------------
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# Check if the C compiler understands _Static_assert(),
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# and define HAVE__STATIC_ASSERT if so.
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#
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# We actually check the syntax ({ _Static_assert(...) }), because we need
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# gcc-style compound expressions to be able to wrap the thing into macros.
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AC_DEFUN([PGAC_C_STATIC_ASSERT],
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[AC_CACHE_CHECK(for _Static_assert, pgac_cv__static_assert,
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[AC_TRY_LINK([],
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[({ _Static_assert(1, "foo"); })],
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[pgac_cv__static_assert=yes],
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[pgac_cv__static_assert=no])])
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if test x"$pgac_cv__static_assert" = xyes ; then
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AC_DEFINE(HAVE__STATIC_ASSERT, 1,
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[Define to 1 if your compiler understands _Static_assert.])
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fi])# PGAC_C_STATIC_ASSERT
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# PGAC_C_TYPES_COMPATIBLE
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# -----------------------
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# Check if the C compiler understands __builtin_types_compatible_p,
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# and define HAVE__BUILTIN_TYPES_COMPATIBLE_P if so.
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#
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# We check usage with __typeof__, though it's unlikely any compiler would
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# have the former and not the latter.
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AC_DEFUN([PGAC_C_TYPES_COMPATIBLE],
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[AC_CACHE_CHECK(for __builtin_types_compatible_p, pgac_cv__types_compatible,
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[AC_TRY_COMPILE([],
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[ int x; static int y[__builtin_types_compatible_p(__typeof__(x), int)]; ],
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[pgac_cv__types_compatible=yes],
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[pgac_cv__types_compatible=no])])
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if test x"$pgac_cv__types_compatible" = xyes ; then
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AC_DEFINE(HAVE__BUILTIN_TYPES_COMPATIBLE_P, 1,
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[Define to 1 if your compiler understands __builtin_types_compatible_p.])
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fi])# PGAC_C_TYPES_COMPATIBLE
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# PGAC_C_BUILTIN_BSWAP32
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# -------------------------
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# Check if the C compiler understands __builtin_bswap32(),
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# and define HAVE__BUILTIN_BSWAP32 if so.
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AC_DEFUN([PGAC_C_BUILTIN_BSWAP32],
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[AC_CACHE_CHECK(for __builtin_bswap32, pgac_cv__builtin_bswap32,
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[AC_TRY_COMPILE([static unsigned long int x = __builtin_bswap32(0xaabbccdd);],
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[],
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[pgac_cv__builtin_bswap32=yes],
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[pgac_cv__builtin_bswap32=no])])
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if test x"$pgac_cv__builtin_bswap32" = xyes ; then
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AC_DEFINE(HAVE__BUILTIN_BSWAP32, 1,
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[Define to 1 if your compiler understands __builtin_bswap32.])
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fi])# PGAC_C_BUILTIN_BSWAP32
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# PGAC_C_BUILTIN_CONSTANT_P
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# -------------------------
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# Check if the C compiler understands __builtin_constant_p(),
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# and define HAVE__BUILTIN_CONSTANT_P if so.
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AC_DEFUN([PGAC_C_BUILTIN_CONSTANT_P],
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[AC_CACHE_CHECK(for __builtin_constant_p, pgac_cv__builtin_constant_p,
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[AC_TRY_COMPILE([static int x; static int y[__builtin_constant_p(x) ? x : 1];],
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[],
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[pgac_cv__builtin_constant_p=yes],
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[pgac_cv__builtin_constant_p=no])])
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if test x"$pgac_cv__builtin_constant_p" = xyes ; then
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AC_DEFINE(HAVE__BUILTIN_CONSTANT_P, 1,
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[Define to 1 if your compiler understands __builtin_constant_p.])
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fi])# PGAC_C_BUILTIN_CONSTANT_P
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# PGAC_C_BUILTIN_UNREACHABLE
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# --------------------------
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# Check if the C compiler understands __builtin_unreachable(),
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# and define HAVE__BUILTIN_UNREACHABLE if so.
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#
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# NB: Don't get the idea of putting a for(;;); or such before the
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# __builtin_unreachable() call. Some compilers would remove it before linking
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# and only a warning instead of an error would be produced.
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AC_DEFUN([PGAC_C_BUILTIN_UNREACHABLE],
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[AC_CACHE_CHECK(for __builtin_unreachable, pgac_cv__builtin_unreachable,
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[AC_TRY_LINK([],
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[__builtin_unreachable();],
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[pgac_cv__builtin_unreachable=yes],
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[pgac_cv__builtin_unreachable=no])])
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if test x"$pgac_cv__builtin_unreachable" = xyes ; then
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AC_DEFINE(HAVE__BUILTIN_UNREACHABLE, 1,
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[Define to 1 if your compiler understands __builtin_unreachable.])
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fi])# PGAC_C_BUILTIN_UNREACHABLE
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# PGAC_C_VA_ARGS
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# --------------
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# Check if the C compiler understands C99-style variadic macros,
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# and define HAVE__VA_ARGS if so.
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AC_DEFUN([PGAC_C_VA_ARGS],
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[AC_CACHE_CHECK(for __VA_ARGS__, pgac_cv__va_args,
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[AC_TRY_COMPILE([#include <stdio.h>],
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[#define debug(...) fprintf(stderr, __VA_ARGS__)
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debug("%s", "blarg");
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],
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[pgac_cv__va_args=yes],
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[pgac_cv__va_args=no])])
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if test x"$pgac_cv__va_args" = xyes ; then
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AC_DEFINE(HAVE__VA_ARGS, 1,
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[Define to 1 if your compiler understands __VA_ARGS__ in macros.])
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fi])# PGAC_C_VA_ARGS
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# PGAC_PROG_CC_CFLAGS_OPT
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# -----------------------
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# Given a string, check if the compiler supports the string as a
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# command-line option. If it does, add the string to CFLAGS.
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AC_DEFUN([PGAC_PROG_CC_CFLAGS_OPT],
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[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_cflags_$1])])dnl
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AC_CACHE_CHECK([whether $CC supports $1], [Ac_cachevar],
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[pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS $1"
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ac_save_c_werror_flag=$ac_c_werror_flag
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ac_c_werror_flag=yes
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_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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[Ac_cachevar=yes],
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[Ac_cachevar=no])
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ac_c_werror_flag=$ac_save_c_werror_flag
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CFLAGS="$pgac_save_CFLAGS"])
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if test x"$Ac_cachevar" = x"yes"; then
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CFLAGS="$CFLAGS $1"
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fi
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undefine([Ac_cachevar])dnl
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])# PGAC_PROG_CC_CFLAGS_OPT
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# PGAC_PROG_CC_VAR_OPT
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# -----------------------
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# Given a variable name and a string, check if the compiler supports
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# the string as a command-line option. If it does, add the string to
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# the given variable.
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AC_DEFUN([PGAC_PROG_CC_VAR_OPT],
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[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_cflags_$2])])dnl
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AC_CACHE_CHECK([whether $CC supports $2], [Ac_cachevar],
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[pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS $2"
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ac_save_c_werror_flag=$ac_c_werror_flag
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ac_c_werror_flag=yes
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_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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[Ac_cachevar=yes],
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[Ac_cachevar=no])
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ac_c_werror_flag=$ac_save_c_werror_flag
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CFLAGS="$pgac_save_CFLAGS"])
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if test x"$Ac_cachevar" = x"yes"; then
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$1="${$1} $2"
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fi
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undefine([Ac_cachevar])dnl
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])# PGAC_PROG_CC_CFLAGS_OPT
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# PGAC_PROG_CC_LDFLAGS_OPT
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# ------------------------
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# Given a string, check if the compiler supports the string as a
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# command-line option. If it does, add the string to LDFLAGS.
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# For reasons you'd really rather not know about, this checks whether
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# you can link to a particular function, not just whether you can link.
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# In fact, we must actually check that the resulting program runs :-(
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AC_DEFUN([PGAC_PROG_CC_LDFLAGS_OPT],
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[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_ldflags_$1])])dnl
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AC_CACHE_CHECK([whether $CC supports $1], [Ac_cachevar],
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[pgac_save_LDFLAGS=$LDFLAGS
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LDFLAGS="$pgac_save_LDFLAGS $1"
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AC_RUN_IFELSE([AC_LANG_PROGRAM([extern void $2 (); void (*fptr) () = $2;],[])],
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[Ac_cachevar=yes],
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[Ac_cachevar=no],
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[Ac_cachevar="assuming no"])
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LDFLAGS="$pgac_save_LDFLAGS"])
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if test x"$Ac_cachevar" = x"yes"; then
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LDFLAGS="$LDFLAGS $1"
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fi
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undefine([Ac_cachevar])dnl
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])# PGAC_PROG_CC_LDFLAGS_OPT
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# PGAC_HAVE_GCC__SYNC_CHAR_TAS
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# -------------------------
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# Check if the C compiler understands __sync_lock_test_and_set(char),
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# and define HAVE_GCC__SYNC_CHAR_TAS
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#
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# NB: There are platforms where test_and_set is available but compare_and_swap
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# is not, so test this separately.
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# NB: Some platforms only do 32bit tas, others only do 8bit tas. Test both.
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AC_DEFUN([PGAC_HAVE_GCC__SYNC_CHAR_TAS],
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[AC_CACHE_CHECK(for builtin __sync char locking functions, pgac_cv_gcc_sync_char_tas,
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[AC_TRY_LINK([],
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[char lock = 0;
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__sync_lock_test_and_set(&lock, 1);
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__sync_lock_release(&lock);],
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[pgac_cv_gcc_sync_char_tas="yes"],
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[pgac_cv_gcc_sync_char_tas="no"])])
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if test x"$pgac_cv_gcc_sync_char_tas" = x"yes"; then
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AC_DEFINE(HAVE_GCC__SYNC_CHAR_TAS, 1, [Define to 1 if you have __sync_lock_test_and_set(char *) and friends.])
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fi])# PGAC_HAVE_GCC__SYNC_CHAR_TAS
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# PGAC_HAVE_GCC__SYNC_INT32_TAS
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# -------------------------
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# Check if the C compiler understands __sync_lock_test_and_set(),
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# and define HAVE_GCC__SYNC_INT32_TAS
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AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT32_TAS],
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[AC_CACHE_CHECK(for builtin __sync int32 locking functions, pgac_cv_gcc_sync_int32_tas,
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[AC_TRY_LINK([],
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[int lock = 0;
|
|
__sync_lock_test_and_set(&lock, 1);
|
|
__sync_lock_release(&lock);],
|
|
[pgac_cv_gcc_sync_int32_tas="yes"],
|
|
[pgac_cv_gcc_sync_int32_tas="no"])])
|
|
if test x"$pgac_cv_gcc_sync_int32_tas" = x"yes"; then
|
|
AC_DEFINE(HAVE_GCC__SYNC_INT32_TAS, 1, [Define to 1 if you have __sync_lock_test_and_set(int *) and friends.])
|
|
fi])# PGAC_HAVE_GCC__SYNC_INT32_TAS
|
|
|
|
# PGAC_HAVE_GCC__SYNC_INT32_CAS
|
|
# -------------------------
|
|
# Check if the C compiler understands __sync_compare_and_swap() for 32bit
|
|
# types, and define HAVE_GCC__SYNC_INT32_CAS if so.
|
|
AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT32_CAS],
|
|
[AC_CACHE_CHECK(for builtin __sync int32 atomic operations, pgac_cv_gcc_sync_int32_cas,
|
|
[AC_TRY_LINK([],
|
|
[int val = 0;
|
|
__sync_val_compare_and_swap(&val, 0, 37);],
|
|
[pgac_cv_gcc_sync_int32_cas="yes"],
|
|
[pgac_cv_gcc_sync_int32_cas="no"])])
|
|
if test x"$pgac_cv_gcc_sync_int32_cas" = x"yes"; then
|
|
AC_DEFINE(HAVE_GCC__SYNC_INT32_CAS, 1, [Define to 1 if you have __sync_compare_and_swap(int *, int, int).])
|
|
fi])# PGAC_HAVE_GCC__SYNC_INT32_CAS
|
|
|
|
# PGAC_HAVE_GCC__SYNC_INT64_CAS
|
|
# -------------------------
|
|
# Check if the C compiler understands __sync_compare_and_swap() for 64bit
|
|
# types, and define HAVE_GCC__SYNC_INT64_CAS if so.
|
|
AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT64_CAS],
|
|
[AC_CACHE_CHECK(for builtin __sync int64 atomic operations, pgac_cv_gcc_sync_int64_cas,
|
|
[AC_TRY_LINK([],
|
|
[PG_INT64_TYPE lock = 0;
|
|
__sync_val_compare_and_swap(&lock, 0, (PG_INT64_TYPE) 37);],
|
|
[pgac_cv_gcc_sync_int64_cas="yes"],
|
|
[pgac_cv_gcc_sync_int64_cas="no"])])
|
|
if test x"$pgac_cv_gcc_sync_int64_cas" = x"yes"; then
|
|
AC_DEFINE(HAVE_GCC__SYNC_INT64_CAS, 1, [Define to 1 if you have __sync_compare_and_swap(int64 *, int64, int64).])
|
|
fi])# PGAC_HAVE_GCC__SYNC_INT64_CAS
|
|
|
|
# PGAC_HAVE_GCC__ATOMIC_INT32_CAS
|
|
# -------------------------
|
|
# Check if the C compiler understands __atomic_compare_exchange_n() for 32bit
|
|
# types, and define HAVE_GCC__ATOMIC_INT32_CAS if so.
|
|
AC_DEFUN([PGAC_HAVE_GCC__ATOMIC_INT32_CAS],
|
|
[AC_CACHE_CHECK(for builtin __atomic int32 atomic operations, pgac_cv_gcc_atomic_int32_cas,
|
|
[AC_TRY_LINK([],
|
|
[int val = 0;
|
|
int expect = 0;
|
|
__atomic_compare_exchange_n(&val, &expect, 37, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);],
|
|
[pgac_cv_gcc_atomic_int32_cas="yes"],
|
|
[pgac_cv_gcc_atomic_int32_cas="no"])])
|
|
if test x"$pgac_cv_gcc_atomic_int32_cas" = x"yes"; then
|
|
AC_DEFINE(HAVE_GCC__ATOMIC_INT32_CAS, 1, [Define to 1 if you have __atomic_compare_exchange_n(int *, int *, int).])
|
|
fi])# PGAC_HAVE_GCC__ATOMIC_INT32_CAS
|
|
|
|
# PGAC_HAVE_GCC__ATOMIC_INT64_CAS
|
|
# -------------------------
|
|
# Check if the C compiler understands __atomic_compare_exchange_n() for 64bit
|
|
# types, and define HAVE_GCC__ATOMIC_INT64_CAS if so.
|
|
AC_DEFUN([PGAC_HAVE_GCC__ATOMIC_INT64_CAS],
|
|
[AC_CACHE_CHECK(for builtin __atomic int64 atomic operations, pgac_cv_gcc_atomic_int64_cas,
|
|
[AC_TRY_LINK([],
|
|
[PG_INT64_TYPE val = 0;
|
|
PG_INT64_TYPE expect = 0;
|
|
__atomic_compare_exchange_n(&val, &expect, 37, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);],
|
|
[pgac_cv_gcc_atomic_int64_cas="yes"],
|
|
[pgac_cv_gcc_atomic_int64_cas="no"])])
|
|
if test x"$pgac_cv_gcc_atomic_int64_cas" = x"yes"; then
|
|
AC_DEFINE(HAVE_GCC__ATOMIC_INT64_CAS, 1, [Define to 1 if you have __atomic_compare_exchange_n(int64 *, int *, int64).])
|
|
fi])# PGAC_HAVE_GCC__ATOMIC_INT64_CAS
|