diff options
Diffstat (limited to 'build/configure.ac.openmp')
| -rwxr-xr-x | build/configure.ac.openmp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/build/configure.ac.openmp b/build/configure.ac.openmp new file mode 100755 index 000000000..e5bff7f23 --- /dev/null +++ b/build/configure.ac.openmp @@ -0,0 +1,74 @@ +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="" +]) |