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postgresql/config/c-compiler.m4
Andres Freund 6869b4f258 Add C++ support to configure. 
This is an optional dependency. It'll be used for the upcoming LLVM
based just in time compilation support, which needs to wrap a few LLVM
C++ APIs so they're accessible from C..

For now test for C++ compilers unconditionally, without failing if not
present, to ensure wide buildfarm coverage. If we're bothered by the
additional test times (which are quite short) or verbosity, we can
later make the tests conditional on --with-llvm.

Author: Andres Freund
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
2018-03-20 15:48:48 -07:00

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# Macros to detect C compiler features
# config/c-compiler.m4
# PGAC_C_SIGNED
# -------------
# Check if the C compiler understands signed types.
AC_DEFUN([PGAC_C_SIGNED],
[AC_CACHE_CHECK(for signed types, pgac_cv_c_signed,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[signed char c; signed short s; signed int i;])],
[pgac_cv_c_signed=yes],
[pgac_cv_c_signed=no])])
if test x"$pgac_cv_c_signed" = xno ; then
AC_DEFINE(signed,, [Define to empty if the C compiler does not understand signed types.])
fi])# PGAC_C_SIGNED
# PGAC_C_PRINTF_ARCHETYPE
# -----------------------
# Set the format archetype used by gcc to check printf type functions. We
# prefer "gnu_printf", which includes what glibc uses, such as %m for error
# strings and %lld for 64 bit long longs. GCC 4.4 introduced it. It makes a
# dramatic difference on Windows.
AC_DEFUN([PGAC_PRINTF_ARCHETYPE],
[AC_CACHE_CHECK([for printf format archetype], pgac_cv_printf_archetype,
[ac_save_c_werror_flag=$ac_c_werror_flag
ac_c_werror_flag=yes
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[extern int
pgac_write(int ignore, const char *fmt,...)
__attribute__((format(gnu_printf, 2, 3)));], [])],
[pgac_cv_printf_archetype=gnu_printf],
[pgac_cv_printf_archetype=printf])
ac_c_werror_flag=$ac_save_c_werror_flag])
AC_DEFINE_UNQUOTED([PG_PRINTF_ATTRIBUTE], [$pgac_cv_printf_archetype],
[Define to gnu_printf if compiler supports it, else printf.])
])# PGAC_PRINTF_ARCHETYPE
# PGAC_TYPE_64BIT_INT(TYPE)
# -------------------------
# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
# yes or no respectively, and define HAVE_TYPE_64 if yes.
AC_DEFUN([PGAC_TYPE_64BIT_INT],
[define([Ac_define], [translit([have_$1_64], [a-z *], [A-Z_P])])dnl
define([Ac_cachevar], [translit([pgac_cv_type_$1_64], [ *], [_p])])dnl
AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[typedef $1 ac_int64;
/*
* These are globals to discourage the compiler from folding all the
* arithmetic tests down to compile-time constants.
*/
ac_int64 a = 20000001;
ac_int64 b = 40000005;
int does_int64_work()
{
ac_int64 c,d;
if (sizeof(ac_int64) != 8)
return 0; /* definitely not the right size */
/* Do perfunctory checks to see if 64-bit arithmetic seems to work */
c = a * b;
d = (c + b) / b;
if (d != a+1)
return 0;
return 1;
}
int
main() {
return (! does_int64_work());
}])],
[Ac_cachevar=yes],
[Ac_cachevar=no],
[# If cross-compiling, check the size reported by the compiler and
# trust that the arithmetic works.
AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([], [sizeof($1) == 8])],
Ac_cachevar=yes,
Ac_cachevar=no)])])
Ac_define=$Ac_cachevar
if test x"$Ac_cachevar" = xyes ; then
AC_DEFINE(Ac_define, 1, [Define to 1 if `]$1[' works and is 64 bits.])
fi
undefine([Ac_define])dnl
undefine([Ac_cachevar])dnl
])# PGAC_TYPE_64BIT_INT
# PGAC_TYPE_128BIT_INT
# ---------------------
# Check if __int128 is a working 128 bit integer type, and if so
# define PG_INT128_TYPE to that typename, and define ALIGNOF_PG_INT128_TYPE
# as its alignment requirement.
#
# This currently only detects a GCC/clang extension, but support for other
# environments may be added in the future.
#
# For the moment we only test for support for 128bit math; support for
# 128bit literals and snprintf is not required.
AC_DEFUN([PGAC_TYPE_128BIT_INT],
[AC_CACHE_CHECK([for __int128], [pgac_cv__128bit_int],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([
/*
* We don't actually run this test, just link it to verify that any support
* functions needed for __int128 are present.
*
* These are globals to discourage the compiler from folding all the
* arithmetic tests down to compile-time constants. We do not have
* convenient support for 128bit literals at this point...
*/
__int128 a = 48828125;
__int128 b = 97656250;
],[
__int128 c,d;
a = (a << 12) + 1; /* 200000000001 */
b = (b << 12) + 5; /* 400000000005 */
/* try the most relevant arithmetic ops */
c = a * b;
d = (c + b) / b;
/* must use the results, else compiler may optimize arithmetic away */
if (d != a+1)
return 1;
])],
[pgac_cv__128bit_int=yes],
[pgac_cv__128bit_int=no])])
if test x"$pgac_cv__128bit_int" = xyes ; then
# Use of non-default alignment with __int128 tickles bugs in some compilers.
# If not cross-compiling, we can test for bugs and disable use of __int128
# with buggy compilers. If cross-compiling, hope for the best.
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83925
AC_CACHE_CHECK([for __int128 alignment bug], [pgac_cv__128bit_int_bug],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([
/* This must match the corresponding code in c.h: */
#if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__)
#define pg_attribute_aligned(a) __attribute__((aligned(a)))
#endif
typedef __int128 int128a
#if defined(pg_attribute_aligned)
pg_attribute_aligned(8)
#endif
;
int128a holder;
void pass_by_val(void *buffer, int128a par) { holder = par; }
],[
long int i64 = 97656225L << 12;
int128a q;
pass_by_val(main, (int128a) i64);
q = (int128a) i64;
if (q != holder)
return 1;
])],
[pgac_cv__128bit_int_bug=ok],
[pgac_cv__128bit_int_bug=broken],
[pgac_cv__128bit_int_bug="assuming ok"])])
if test x"$pgac_cv__128bit_int_bug" != xbroken ; then
AC_DEFINE(PG_INT128_TYPE, __int128, [Define to the name of a signed 128-bit integer type.])
AC_CHECK_ALIGNOF(PG_INT128_TYPE)
fi
fi])# PGAC_TYPE_128BIT_INT
# PGAC_C_FUNCNAME_SUPPORT
# -----------------------
# Check if the C compiler understands __func__ (C99) or __FUNCTION__ (gcc).
# Define HAVE_FUNCNAME__FUNC or HAVE_FUNCNAME__FUNCTION accordingly.
AC_DEFUN([PGAC_C_FUNCNAME_SUPPORT],
[AC_CACHE_CHECK(for __func__, pgac_cv_funcname_func_support,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>],
[printf("%s\n", __func__);])],
[pgac_cv_funcname_func_support=yes],
[pgac_cv_funcname_func_support=no])])
if test x"$pgac_cv_funcname_func_support" = xyes ; then
AC_DEFINE(HAVE_FUNCNAME__FUNC, 1,
[Define to 1 if your compiler understands __func__.])
else
AC_CACHE_CHECK(for __FUNCTION__, pgac_cv_funcname_function_support,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>],
[printf("%s\n", __FUNCTION__);])],
[pgac_cv_funcname_function_support=yes],
[pgac_cv_funcname_function_support=no])])
if test x"$pgac_cv_funcname_function_support" = xyes ; then
AC_DEFINE(HAVE_FUNCNAME__FUNCTION, 1,
[Define to 1 if your compiler understands __FUNCTION__.])
fi
fi])# PGAC_C_FUNCNAME_SUPPORT
# PGAC_C_STATIC_ASSERT
# --------------------
# Check if the C compiler understands _Static_assert(),
# and define HAVE__STATIC_ASSERT if so.
#
# We actually check the syntax ({ _Static_assert(...) }), because we need
# gcc-style compound expressions to be able to wrap the thing into macros.
AC_DEFUN([PGAC_C_STATIC_ASSERT],
[AC_CACHE_CHECK(for _Static_assert, pgac_cv__static_assert,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[({ _Static_assert(1, "foo"); })])],
[pgac_cv__static_assert=yes],
[pgac_cv__static_assert=no])])
if test x"$pgac_cv__static_assert" = xyes ; then
AC_DEFINE(HAVE__STATIC_ASSERT, 1,
[Define to 1 if your compiler understands _Static_assert.])
fi])# PGAC_C_STATIC_ASSERT
# PGAC_C_TYPEOF
# -------------
# Check if the C compiler understands typeof or a variant. Define
# HAVE_TYPEOF if so, and define 'typeof' to the actual key word.
#
AC_DEFUN([PGAC_C_TYPEOF],
[AC_CACHE_CHECK(for typeof, pgac_cv_c_typeof,
[pgac_cv_c_typeof=no
for pgac_kw in typeof __typeof__ decltype; do
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[int x = 0;
$pgac_kw(x) y;
y = x;
return y;])],
[pgac_cv_c_typeof=$pgac_kw])
test "$pgac_cv_c_typeof" != no && break
done])
if test "$pgac_cv_c_typeof" != no; then
AC_DEFINE(HAVE_TYPEOF, 1,
[Define to 1 if your compiler understands `typeof' or something similar.])
if test "$pgac_cv_c_typeof" != typeof; then
AC_DEFINE_UNQUOTED(typeof, $pgac_cv_c_typeof, [Define to how the compiler spells `typeof'.])
fi
fi])# PGAC_C_TYPEOF
# PGAC_C_TYPES_COMPATIBLE
# -----------------------
# Check if the C compiler understands __builtin_types_compatible_p,
# and define HAVE__BUILTIN_TYPES_COMPATIBLE_P if so.
#
# We check usage with __typeof__, though it's unlikely any compiler would
# have the former and not the latter.
AC_DEFUN([PGAC_C_TYPES_COMPATIBLE],
[AC_CACHE_CHECK(for __builtin_types_compatible_p, pgac_cv__types_compatible,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[[ int x; static int y[__builtin_types_compatible_p(__typeof__(x), int)]; ]])],
[pgac_cv__types_compatible=yes],
[pgac_cv__types_compatible=no])])
if test x"$pgac_cv__types_compatible" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_TYPES_COMPATIBLE_P, 1,
[Define to 1 if your compiler understands __builtin_types_compatible_p.])
fi])# PGAC_C_TYPES_COMPATIBLE
# PGAC_C_BUILTIN_BSWAP16
# -------------------------
# Check if the C compiler understands __builtin_bswap16(),
# and define HAVE__BUILTIN_BSWAP16 if so.
AC_DEFUN([PGAC_C_BUILTIN_BSWAP16],
[AC_CACHE_CHECK(for __builtin_bswap16, pgac_cv__builtin_bswap16,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[static unsigned long int x = __builtin_bswap16(0xaabb);]
)],
[pgac_cv__builtin_bswap16=yes],
[pgac_cv__builtin_bswap16=no])])
if test x"$pgac_cv__builtin_bswap16" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_BSWAP16, 1,
[Define to 1 if your compiler understands __builtin_bswap16.])
fi])# PGAC_C_BUILTIN_BSWAP16
# PGAC_C_BUILTIN_BSWAP32
# -------------------------
# Check if the C compiler understands __builtin_bswap32(),
# and define HAVE__BUILTIN_BSWAP32 if so.
AC_DEFUN([PGAC_C_BUILTIN_BSWAP32],
[AC_CACHE_CHECK(for __builtin_bswap32, pgac_cv__builtin_bswap32,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[static unsigned long int x = __builtin_bswap32(0xaabbccdd);]
)],
[pgac_cv__builtin_bswap32=yes],
[pgac_cv__builtin_bswap32=no])])
if test x"$pgac_cv__builtin_bswap32" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_BSWAP32, 1,
[Define to 1 if your compiler understands __builtin_bswap32.])
fi])# PGAC_C_BUILTIN_BSWAP32
# PGAC_C_BUILTIN_BSWAP64
# -------------------------
# Check if the C compiler understands __builtin_bswap64(),
# and define HAVE__BUILTIN_BSWAP64 if so.
AC_DEFUN([PGAC_C_BUILTIN_BSWAP64],
[AC_CACHE_CHECK(for __builtin_bswap64, pgac_cv__builtin_bswap64,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[static unsigned long int x = __builtin_bswap64(0xaabbccddeeff0011);]
)],
[pgac_cv__builtin_bswap64=yes],
[pgac_cv__builtin_bswap64=no])])
if test x"$pgac_cv__builtin_bswap64" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_BSWAP64, 1,
[Define to 1 if your compiler understands __builtin_bswap64.])
fi])# PGAC_C_BUILTIN_BSWAP64
# PGAC_C_BUILTIN_CONSTANT_P
# -------------------------
# Check if the C compiler understands __builtin_constant_p(),
# and define HAVE__BUILTIN_CONSTANT_P if so.
# We need __builtin_constant_p("string literal") to be true, but some older
# compilers don't think that, so test for that case explicitly.
AC_DEFUN([PGAC_C_BUILTIN_CONSTANT_P],
[AC_CACHE_CHECK(for __builtin_constant_p, pgac_cv__builtin_constant_p,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[[static int x;
static int y[__builtin_constant_p(x) ? x : 1];
static int z[__builtin_constant_p("string literal") ? 1 : x];
]]
)],
[pgac_cv__builtin_constant_p=yes],
[pgac_cv__builtin_constant_p=no])])
if test x"$pgac_cv__builtin_constant_p" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_CONSTANT_P, 1,
[Define to 1 if your compiler understands __builtin_constant_p.])
fi])# PGAC_C_BUILTIN_CONSTANT_P
# PGAC_C_BUILTIN_OP_OVERFLOW
# -------------------------
# Check if the C compiler understands __builtin_$op_overflow(),
# and define HAVE__BUILTIN_OP_OVERFLOW if so.
#
# Check for the most complicated case, 64 bit multiplication, as a
# proxy for all of the operations. To detect the case where the compiler
# knows the function but library support is missing, we must link not just
# compile, and store the results in global variables so the compiler doesn't
# optimize away the call.
AC_DEFUN([PGAC_C_BUILTIN_OP_OVERFLOW],
[AC_CACHE_CHECK(for __builtin_mul_overflow, pgac_cv__builtin_op_overflow,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([
PG_INT64_TYPE a = 1;
PG_INT64_TYPE b = 1;
PG_INT64_TYPE result;
int oflo;
],
[oflo = __builtin_mul_overflow(a, b, &result);])],
[pgac_cv__builtin_op_overflow=yes],
[pgac_cv__builtin_op_overflow=no])])
if test x"$pgac_cv__builtin_op_overflow" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_OP_OVERFLOW, 1,
[Define to 1 if your compiler understands __builtin_$op_overflow.])
fi])# PGAC_C_BUILTIN_OP_OVERFLOW
# PGAC_C_BUILTIN_UNREACHABLE
# --------------------------
# Check if the C compiler understands __builtin_unreachable(),
# and define HAVE__BUILTIN_UNREACHABLE if so.
#
# NB: Don't get the idea of putting a for(;;); or such before the
# __builtin_unreachable() call. Some compilers would remove it before linking
# and only a warning instead of an error would be produced.
AC_DEFUN([PGAC_C_BUILTIN_UNREACHABLE],
[AC_CACHE_CHECK(for __builtin_unreachable, pgac_cv__builtin_unreachable,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[__builtin_unreachable();])],
[pgac_cv__builtin_unreachable=yes],
[pgac_cv__builtin_unreachable=no])])
if test x"$pgac_cv__builtin_unreachable" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_UNREACHABLE, 1,
[Define to 1 if your compiler understands __builtin_unreachable.])
fi])# PGAC_C_BUILTIN_UNREACHABLE
# PGAC_C_COMPUTED_GOTO
# -----------------------
# Check if the C compiler knows computed gotos (gcc extension, also
# available in at least clang). If so, define HAVE_COMPUTED_GOTO.
#
# Checking whether computed gotos are supported syntax-wise ought to
# be enough, as the syntax is otherwise illegal.
AC_DEFUN([PGAC_C_COMPUTED_GOTO],
[AC_CACHE_CHECK(for computed goto support, pgac_cv_computed_goto,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[[void *labeladdrs[] = {&&my_label};
goto *labeladdrs[0];
my_label:
return 1;
]])],
[pgac_cv_computed_goto=yes],
[pgac_cv_computed_goto=no])])
if test x"$pgac_cv_computed_goto" = xyes ; then
AC_DEFINE(HAVE_COMPUTED_GOTO, 1,
[Define to 1 if your compiler handles computed gotos.])
fi])# PGAC_C_COMPUTED_GOTO
# PGAC_C_VA_ARGS
# --------------
# Check if the C compiler understands C99-style variadic macros,
# and define HAVE__VA_ARGS if so.
AC_DEFUN([PGAC_C_VA_ARGS],
[AC_CACHE_CHECK(for __VA_ARGS__, pgac_cv__va_args,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>],
[#define debug(...) fprintf(stderr, __VA_ARGS__)
debug("%s", "blarg");
])],
[pgac_cv__va_args=yes],
[pgac_cv__va_args=no])])
if test x"$pgac_cv__va_args" = xyes ; then
AC_DEFINE(HAVE__VA_ARGS, 1,
[Define to 1 if your compiler understands __VA_ARGS__ in macros.])
fi])# PGAC_C_VA_ARGS
# PGAC_PROG_VARCC_VARFLAGS_OPT
# -----------------------
# Given a compiler, variable name and a string, check if the compiler
# supports the string as a command-line option. If it does, add the
# string to the given variable.
AC_DEFUN([PGAC_PROG_VARCC_VARFLAGS_OPT],
[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_$1_cflags_$3])])dnl
AC_CACHE_CHECK([whether ${$1} supports $3, for $2], [Ac_cachevar],
[pgac_save_CFLAGS=$CFLAGS
pgac_save_CC=$CC
CC=${$1}
CFLAGS="${$2} $3"
ac_save_c_werror_flag=$ac_c_werror_flag
ac_c_werror_flag=yes
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[Ac_cachevar=yes],
[Ac_cachevar=no])
ac_c_werror_flag=$ac_save_c_werror_flag
CFLAGS="$pgac_save_CFLAGS"
CC="$pgac_save_CC"])
if test x"$Ac_cachevar" = x"yes"; then
$2="${$2} $3"
fi
undefine([Ac_cachevar])dnl
])# PGAC_PROG_VARCC_VARFLAGS_OPT
# PGAC_PROG_CC_CFLAGS_OPT
# -----------------------
# Given a string, check if the compiler supports the string as a
# command-line option. If it does, add the string to CFLAGS.
AC_DEFUN([PGAC_PROG_CC_CFLAGS_OPT], [
PGAC_PROG_VARCC_VARFLAGS_OPT(CC, CFLAGS, $1)
])# PGAC_PROG_CC_CFLAGS_OPT
# PGAC_PROG_CC_VAR_OPT
# -----------------------
# Given a variable name and a string, check if the compiler supports
# the string as a command-line option. If it does, add the string to
# the given variable.
AC_DEFUN([PGAC_PROG_CC_VAR_OPT],
[PGAC_PROG_VARCC_VARFLAGS_OPT(CC, $1, $2)
])# PGAC_PROG_CC_VAR_OPT
# PGAC_PROG_VARCXX_VARFLAGS_OPT
# -----------------------
# Given a compiler, variable name and a string, check if the compiler
# supports the string as a command-line option. If it does, add the
# string to the given variable.
AC_DEFUN([PGAC_PROG_VARCXX_VARFLAGS_OPT],
[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_$1_cxxflags_$3])])dnl
AC_CACHE_CHECK([whether ${$1} supports $3, for $2], [Ac_cachevar],
[pgac_save_CXXFLAGS=$CXXFLAGS
pgac_save_CXX=$CXX
CXX=${$1}
CXXFLAGS="${$2} $3"
ac_save_cxx_werror_flag=$ac_cxx_werror_flag
ac_cxx_werror_flag=yes
AC_LANG_PUSH(C++)
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[Ac_cachevar=yes],
[Ac_cachevar=no])
AC_LANG_POP([])
ac_cxx_werror_flag=$ac_save_cxx_werror_flag
CXXFLAGS="$pgac_save_CXXFLAGS"
CXX="$pgac_save_CXX"])
if test x"$Ac_cachevar" = x"yes"; then
$2="${$2} $3"
fi
undefine([Ac_cachevar])dnl
])# PGAC_PROG_VARCXX_VARFLAGS_OPT
# PGAC_PROG_CXX_CFLAGS_OPT
# -----------------------
# Given a string, check if the compiler supports the string as a
# command-line option. If it does, add the string to CXXFLAGS.
AC_DEFUN([PGAC_PROG_CXX_CFLAGS_OPT],
[PGAC_PROG_VARCXX_VARFLAGS_OPT(CXX, CXXFLAGS, $1)
])# PGAC_PROG_CXX_VAR_OPT
# PGAC_PROG_CC_LDFLAGS_OPT
# ------------------------
# Given a string, check if the compiler supports the string as a
# command-line option. If it does, add the string to LDFLAGS.
# For reasons you'd really rather not know about, this checks whether
# you can link to a particular function, not just whether you can link.
# In fact, we must actually check that the resulting program runs :-(
AC_DEFUN([PGAC_PROG_CC_LDFLAGS_OPT],
[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_ldflags_$1])])dnl
AC_CACHE_CHECK([whether $CC supports $1], [Ac_cachevar],
[pgac_save_LDFLAGS=$LDFLAGS
LDFLAGS="$pgac_save_LDFLAGS $1"
AC_RUN_IFELSE([AC_LANG_PROGRAM([extern void $2 (); void (*fptr) () = $2;],[])],
[Ac_cachevar=yes],
[Ac_cachevar=no],
[Ac_cachevar="assuming no"])
LDFLAGS="$pgac_save_LDFLAGS"])
if test x"$Ac_cachevar" = x"yes"; then
LDFLAGS="$LDFLAGS $1"
fi
undefine([Ac_cachevar])dnl
])# PGAC_PROG_CC_LDFLAGS_OPT
# PGAC_HAVE_GCC__SYNC_CHAR_TAS
# -------------------------
# Check if the C compiler understands __sync_lock_test_and_set(char),
# and define HAVE_GCC__SYNC_CHAR_TAS
#
# NB: There are platforms where test_and_set is available but compare_and_swap
# is not, so test this separately.
# NB: Some platforms only do 32bit tas, others only do 8bit tas. Test both.
AC_DEFUN([PGAC_HAVE_GCC__SYNC_CHAR_TAS],
[AC_CACHE_CHECK(for builtin __sync char locking functions, pgac_cv_gcc_sync_char_tas,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[char lock = 0;
__sync_lock_test_and_set(&lock, 1);
__sync_lock_release(&lock);])],
[pgac_cv_gcc_sync_char_tas="yes"],
[pgac_cv_gcc_sync_char_tas="no"])])
if test x"$pgac_cv_gcc_sync_char_tas" = x"yes"; then
AC_DEFINE(HAVE_GCC__SYNC_CHAR_TAS, 1, [Define to 1 if you have __sync_lock_test_and_set(char *) and friends.])
fi])# PGAC_HAVE_GCC__SYNC_CHAR_TAS
# PGAC_HAVE_GCC__SYNC_INT32_TAS
# -------------------------
# Check if the C compiler understands __sync_lock_test_and_set(),
# and define HAVE_GCC__SYNC_INT32_TAS
AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT32_TAS],
[AC_CACHE_CHECK(for builtin __sync int32 locking functions, pgac_cv_gcc_sync_int32_tas,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[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"$pgac_cv_gcc_sync_int32_tas" = x"yes"; then
AC_DEFINE(HAVE_GCC__SYNC_INT32_TAS, 1, [Define to 1 if you have __sync_lock_test_and_set(int *) and friends.])
fi])# PGAC_HAVE_GCC__SYNC_INT32_TAS
# PGAC_HAVE_GCC__SYNC_INT32_CAS
# -------------------------
# Check if the C compiler understands __sync_compare_and_swap() for 32bit
# types, and define HAVE_GCC__SYNC_INT32_CAS if so.
AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT32_CAS],
[AC_CACHE_CHECK(for builtin __sync int32 atomic operations, pgac_cv_gcc_sync_int32_cas,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[int val = 0;
__sync_val_compare_and_swap(&val, 0, 37);])],
[pgac_cv_gcc_sync_int32_cas="yes"],
[pgac_cv_gcc_sync_int32_cas="no"])])
if test x"$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_LINK_IFELSE([AC_LANG_PROGRAM([],
[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"$pgac_cv_gcc_sync_int64_cas" = x"yes"; then
AC_DEFINE(HAVE_GCC__SYNC_INT64_CAS, 1, [Define to 1 if you have __sync_compare_and_swap(int64 *, int64, int64).])
fi])# PGAC_HAVE_GCC__SYNC_INT64_CAS
# PGAC_HAVE_GCC__ATOMIC_INT32_CAS
# -------------------------
# Check if the C compiler understands __atomic_compare_exchange_n() for 32bit
# types, and define HAVE_GCC__ATOMIC_INT32_CAS if so.
AC_DEFUN([PGAC_HAVE_GCC__ATOMIC_INT32_CAS],
[AC_CACHE_CHECK(for builtin __atomic int32 atomic operations, pgac_cv_gcc_atomic_int32_cas,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[int val = 0;
int expect = 0;
__atomic_compare_exchange_n(&val, &expect, 37, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);])],
[pgac_cv_gcc_atomic_int32_cas="yes"],
[pgac_cv_gcc_atomic_int32_cas="no"])])
if test x"$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_LINK_IFELSE([AC_LANG_PROGRAM([],
[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
# PGAC_SSE42_CRC32_INTRINSICS
# -----------------------
# Check if the compiler supports the x86 CRC instructions added in SSE 4.2,
# using the _mm_crc32_u8 and _mm_crc32_u32 intrinsic functions. (We don't
# test the 8-byte variant, _mm_crc32_u64, but it is assumed to be present if
# the other ones are, on x86-64 platforms)
#
# An optional compiler flag can be passed as argument (e.g. -msse4.2). If the
# intrinsics are supported, sets pgac_sse42_crc32_intrinsics, and CFLAGS_SSE42.
AC_DEFUN([PGAC_SSE42_CRC32_INTRINSICS],
[define([Ac_cachevar], [AS_TR_SH([pgac_cv_sse42_crc32_intrinsics_$1])])dnl
AC_CACHE_CHECK([for _mm_crc32_u8 and _mm_crc32_u32 with CFLAGS=$1], [Ac_cachevar],
[pgac_save_CFLAGS=$CFLAGS
CFLAGS="$pgac_save_CFLAGS $1"
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <nmmintrin.h>],
[unsigned int crc = 0;
crc = _mm_crc32_u8(crc, 0);
crc = _mm_crc32_u32(crc, 0);
/* return computed value, to prevent the above being optimized away */
return crc == 0;])],
[Ac_cachevar=yes],
[Ac_cachevar=no])
CFLAGS="$pgac_save_CFLAGS"])
if test x"$Ac_cachevar" = x"yes"; then
CFLAGS_SSE42="$1"
pgac_sse42_crc32_intrinsics=yes
fi
undefine([Ac_cachevar])dnl
])# PGAC_SSE42_CRC32_INTRINSICS
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