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m4_define([libcairo_openmp_program],[dnl
#include <stdio.h>
extern unsigned int lcg_seed;
#pragma omp threadprivate(lcg_seed)
unsigned int lcg_seed;
unsigned function(unsigned a, unsigned b)
{
lcg_seed ^= b;
return ((a + b) ^ a ) + lcg_seed;
}
int main(int argc, char **argv)
{
int i;
int n1 = 0, n2 = argc;
unsigned checksum = 0;
int verbose = argv != NULL;
unsigned (*test_function)(unsigned, unsigned);
test_function = function;
#pragma omp parallel for reduction(+:checksum) default(none) \
shared(n1, n2, test_function, verbose)
for (i = n1; i < n2; i++)
{
unsigned crc = test_function (i, 0);
if (verbose)
printf ("%d: %08X\n", i, crc);
checksum += crc;
}
printf("%u\n", checksum);
return 0;
}
}])
AC_DEFUN([CAIRO_CHECK_OPENMP],[dnl
CAIRO_CC_TRY_LINK_WITH_ENV_SILENT(
[CFLAGS="$CFLAGS $2";
LIBS="$LIBS $3"],
[$4],
[$1_CFLAGS="$2";
$1_LIBS="$3";
$5],
[$1_CFLAGS="";
$1_LIBS="";
$6])
])
AC_DEFUN([CAIRO_CONFIGURE_OPENMP],[dnl
if test "x$OPENMP_CFLAGS" = "x"; then
OPENMP_CFLAGS="-fopenmp"
fi
if test "x$OPENMP_LIBS" = "x"; then
OPENMP_LIBS="-lgomp"
fi
CAIRO_CHECK_OPENMP(
[openmp], [$OPENMP_CFLAGS], [$OPENMP_LIBS],
[libcairo_openmp_program],
[have_openmp=yes],
[have_openmp=no])
OPENMP_CFLAGS=
OPENMP_LIBS=
dnl Tell autoconf about the results.
if test "x$have_openmp" = "xyes"; then
AC_DEFINE([CAIRO_HAS_OPENMP], 1,
[Define to 1 if we have openmp support])
fi
dnl Set the output variables for CAIRO_ENABLE.
use_openmp="$have_openmp"
openmp_REQUIRES=""
])
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