# Macros to detect C compiler features
-# $PostgreSQL: pgsql/config/c-compiler.m4,v 1.19 2008/06/27 00:36:16 tgl Exp $
+# 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_TRY_COMPILE([],
-[signed char c; signed short s; signed int i;],
+[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"$pgac_cv_c_signed" = xno ; then
+# PGAC_C_PRINTF_ARCHETYPE
+# -----------------------
+# Select the format archetype to be used by gcc to check printf-type functions.
+# We prefer "gnu_printf", as that most closely matches the features supported
+# by src/port/snprintf.c (particularly the %m conversion spec). However,
+# on some NetBSD versions, that doesn't work while "__syslog__" does.
+# If all else fails, use "printf".
+AC_DEFUN([PGAC_PRINTF_ARCHETYPE],
+[AC_CACHE_CHECK([for printf format archetype], pgac_cv_printf_archetype,
+[pgac_cv_printf_archetype=gnu_printf
+PGAC_TEST_PRINTF_ARCHETYPE
+if [[ "$ac_archetype_ok" = no ]]; then
+ pgac_cv_printf_archetype=__syslog__
+ PGAC_TEST_PRINTF_ARCHETYPE
+ if [[ "$ac_archetype_ok" = no ]]; then
+ pgac_cv_printf_archetype=printf
+ fi
+fi])
+AC_DEFINE_UNQUOTED([PG_PRINTF_ATTRIBUTE], [$pgac_cv_printf_archetype],
+[Define to best printf format archetype, usually gnu_printf if available.])
+])# PGAC_PRINTF_ARCHETYPE
+
+# Subroutine: test $pgac_cv_printf_archetype, set $ac_archetype_ok to yes or no
+AC_DEFUN([PGAC_TEST_PRINTF_ARCHETYPE],
+[ac_save_c_werror_flag=$ac_c_werror_flag
+ac_c_werror_flag=yes
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[extern void pgac_write(int ignore, const char *fmt,...)
+__attribute__((format($pgac_cv_printf_archetype, 2, 3)));],
+[pgac_write(0, "error %s: %m", "foo");])],
+ [ac_archetype_ok=yes],
+ [ac_archetype_ok=no])
+ac_c_werror_flag=$ac_save_c_werror_flag
+])# PGAC_TEST_PRINTF_ARCHETYPE
+
+
# PGAC_TYPE_64BIT_INT(TYPE)
# -------------------------
# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
[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_TRY_RUN(
+[AC_RUN_IFELSE([AC_LANG_SOURCE(
[typedef $1 ac_int64;
/*
return 0;
return 1;
}
+
+int
main() {
- exit(! does_int64_work());
-}],
+ return (! does_int64_work());
+}])],
[Ac_cachevar=yes],
[Ac_cachevar=no],
[# If cross-compiling, check the size reported by the compiler and
])# PGAC_TYPE_64BIT_INT
+# PGAC_TYPE_128BIT_INT
+# ---------------------
+# Check if __int128 is a working 128 bit integer type, and if so
+# define PG_INT128_TYPE to that typename, and define ALIGNOF_PG_INT128_TYPE
+# as its alignment requirement.
+#
+# This currently only detects a GCC/clang extension, but support for other
+# environments may be added in the future.
+#
+# For the moment we only test for support for 128bit math; support for
+# 128bit literals and snprintf is not required.
+AC_DEFUN([PGAC_TYPE_128BIT_INT],
+[AC_CACHE_CHECK([for __int128], [pgac_cv__128bit_int],
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([
+/*
+ * We don't actually run this test, just link it to verify that any support
+ * functions needed for __int128 are present.
+ *
+ * These are globals to discourage the compiler from folding all the
+ * arithmetic tests down to compile-time constants. We do not have
+ * convenient support for 128bit literals at this point...
+ */
+__int128 a = 48828125;
+__int128 b = 97656250;
+],[
+__int128 c,d;
+a = (a << 12) + 1; /* 200000000001 */
+b = (b << 12) + 5; /* 400000000005 */
+/* try the most relevant arithmetic ops */
+c = a * b;
+d = (c + b) / b;
+/* must use the results, else compiler may optimize arithmetic away */
+if (d != a+1)
+ return 1;
+])],
+[pgac_cv__128bit_int=yes],
+[pgac_cv__128bit_int=no])])
+if test x"$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"$pgac_cv__128bit_int_bug" != xbroken ; then
+ AC_DEFINE(PG_INT128_TYPE, __int128, [Define to the name of a signed 128-bit integer type.])
+ AC_CHECK_ALIGNOF(PG_INT128_TYPE)
+ fi
+fi])# PGAC_TYPE_128BIT_INT
+
# PGAC_C_FUNCNAME_SUPPORT
# -----------------------
# Define HAVE_FUNCNAME__FUNC or HAVE_FUNCNAME__FUNCTION accordingly.
AC_DEFUN([PGAC_C_FUNCNAME_SUPPORT],
[AC_CACHE_CHECK(for __func__, pgac_cv_funcname_func_support,
-[AC_TRY_COMPILE([#include <stdio.h>],
-[printf("%s\n", __func__);],
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>],
+[printf("%s\n", __func__);])],
[pgac_cv_funcname_func_support=yes],
[pgac_cv_funcname_func_support=no])])
if test x"$pgac_cv_funcname_func_support" = xyes ; then
[Define to 1 if your compiler understands __func__.])
else
AC_CACHE_CHECK(for __FUNCTION__, pgac_cv_funcname_function_support,
-[AC_TRY_COMPILE([#include <stdio.h>],
-[printf("%s\n", __FUNCTION__);],
+[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"$pgac_cv_funcname_function_support" = xyes ; then
+# PGAC_C_STATIC_ASSERT
+# --------------------
+# Check if the C compiler understands _Static_assert(),
+# and define HAVE__STATIC_ASSERT if so.
+#
+# We actually check the syntax ({ _Static_assert(...) }), because we need
+# gcc-style compound expressions to be able to wrap the thing into macros.
+AC_DEFUN([PGAC_C_STATIC_ASSERT],
+[AC_CACHE_CHECK(for _Static_assert, pgac_cv__static_assert,
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
+[({ _Static_assert(1, "foo"); })])],
+[pgac_cv__static_assert=yes],
+[pgac_cv__static_assert=no])])
+if test x"$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_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_CHECK_BUILTIN_FUNC
+# -----------------------
+# This is similar to AC_CHECK_FUNCS(), except that it will work for compiler
+# builtin functions, as that usually fails to.
+# The first argument is the function name, eg [__builtin_clzl], and the
+# second is its argument list, eg [unsigned long x]. The current coding
+# works only for a single argument named x; we might generalize that later.
+# It's assumed that the function's result type is coercible to int.
+# On success, we define "HAVEfuncname" (there's usually more than enough
+# underscores already, so we don't add another one).
+AC_DEFUN([PGAC_CHECK_BUILTIN_FUNC],
+[AC_CACHE_CHECK(for $1, pgac_cv$1,
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([
+int
+call$1($2)
+{
+ return $1(x);
+}], [])],
+[pgac_cv$1=yes],
+[pgac_cv$1=no])])
+if test x"${pgac_cv$1}" = xyes ; then
+AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE$1]), 1,
+ [Define to 1 if your compiler understands $1.])
+fi])# PGAC_CHECK_BUILTIN_FUNC
+
+
+
+# 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],
-[AC_MSG_CHECKING([if $CC supports $1])
-pgac_save_CFLAGS=$CFLAGS
-CFLAGS="$pgac_save_CFLAGS $1"
-_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
- AC_MSG_RESULT(yes),
- [CFLAGS="$pgac_save_CFLAGS"
- AC_MSG_RESULT(no)])
+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
# 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],
-[AC_MSG_CHECKING([if $CC supports $1])
-pgac_save_LDFLAGS=$LDFLAGS
+[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) () = $2;],[])],
- AC_MSG_RESULT(yes),
- [LDFLAGS="$pgac_save_LDFLAGS"
- AC_MSG_RESULT(no)],
- [LDFLAGS="$pgac_save_LDFLAGS"
- AC_MSG_RESULT(assuming no)])
+ [Ac_cachevar=yes],
+ [Ac_cachevar=no],
+ [Ac_cachevar="assuming no"])
+LDFLAGS="$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_val_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"$pgac_cv_gcc_sync_int64_cas" = x"yes"; then
+ AC_DEFINE(HAVE_GCC__SYNC_INT64_CAS, 1, [Define to 1 if you have __sync_val_compare_and_swap(int64 *, int64, int64).])
+fi])# PGAC_HAVE_GCC__SYNC_INT64_CAS
+
+# PGAC_HAVE_GCC__ATOMIC_INT32_CAS
+# -------------------------
+# Check if the C compiler understands __atomic_compare_exchange_n() for 32bit
+# types, and define HAVE_GCC__ATOMIC_INT32_CAS if so.
+AC_DEFUN([PGAC_HAVE_GCC__ATOMIC_INT32_CAS],
+[AC_CACHE_CHECK(for builtin __atomic int32 atomic operations, pgac_cv_gcc_atomic_int32_cas,
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
+ [int val = 0;
+ int expect = 0;
+ __atomic_compare_exchange_n(&val, &expect, 37, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);])],
+ [pgac_cv_gcc_atomic_int32_cas="yes"],
+ [pgac_cv_gcc_atomic_int32_cas="no"])])
+if test x"$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 *, int64 *, 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
+
+
+# PGAC_ARMV8_CRC32C_INTRINSICS
+# -----------------------
+# Check if the compiler supports the CRC32C instructions using the __crc32cb,
+# __crc32ch, __crc32cw, and __crc32cd intrinsic functions. These instructions
+# were first introduced in ARMv8 in the optional CRC Extension, and became
+# mandatory in ARMv8.1.
+#
+# An optional compiler flag can be passed as argument (e.g.
+# -march=armv8-a+crc). If the intrinsics are supported, sets
+# pgac_armv8_crc32c_intrinsics, and CFLAGS_ARMV8_CRC32C.
+AC_DEFUN([PGAC_ARMV8_CRC32C_INTRINSICS],
+[define([Ac_cachevar], [AS_TR_SH([pgac_cv_armv8_crc32c_intrinsics_$1])])dnl
+AC_CACHE_CHECK([for __crc32cb, __crc32ch, __crc32cw, and __crc32cd with CFLAGS=$1], [Ac_cachevar],
+[pgac_save_CFLAGS=$CFLAGS
+CFLAGS="$pgac_save_CFLAGS $1"
+AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <arm_acle.h>],
+ [unsigned int crc = 0;
+ crc = __crc32cb(crc, 0);
+ crc = __crc32ch(crc, 0);
+ crc = __crc32cw(crc, 0);
+ crc = __crc32cd(crc, 0);
+ /* return computed value, to prevent the above being optimized away */
+ return crc == 0;])],
+ [Ac_cachevar=yes],
+ [Ac_cachevar=no])
+CFLAGS="$pgac_save_CFLAGS"])
+if test x"$Ac_cachevar" = x"yes"; then
+ CFLAGS_ARMV8_CRC32C="$1"
+ pgac_armv8_crc32c_intrinsics=yes
+fi
+undefine([Ac_cachevar])dnl
+])# PGAC_ARMV8_CRC32C_INTRINSICS
projects / pgpool2.git / commitdiff