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105 lines
4.4 KiB
Plaintext
105 lines
4.4 KiB
Plaintext
# AC_OPENACC
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# ---------
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# Check which options need to be passed to the C compiler to support Openacc.
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# Set the OPENACC_CFLAGS / OPENACC_CXXFLAGS / OPENACC_FFLAGS variable to these
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# options.
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# The options are necessary at compile time (so the #pragmas are understood)
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# and at link time (so the appropriate library is linked with).
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# This macro takes care to not produce redundant options if $CC $CFLAGS already
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# supports Openacc.
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#
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# For each candidate option, we do a compile test first, then a link test;
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# if the compile test succeeds but the link test fails, that means we have
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# found the correct option but it doesn't work because the libraries are
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# broken. (This can happen, for instance, with SunPRO C and a bad combination
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# of operating system patches.)
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#
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# Several of the options in our candidate list can be misinterpreted by
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# compilers that don't use them to activate Openacc support; for example,
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# many compilers understand "-openacc" to mean "write output to a file
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# named 'penmp'" rather than "enable Openacc". We can't completely avoid
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# the possibility of clobbering files named 'penmp' or 'mp' in configure's
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# working directory; therefore, this macro will bomb out if any such file
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# already exists when it's invoked.
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AC_DEFUN([AX_CXX_OPENACC],
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[AC_REQUIRE([_AX_OPENACC_SAFE_WD])]dnl
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[AC_ARG_ENABLE([openacc],
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[AS_HELP_STRING([--disable-openacc], [do not use Openacc])])]dnl
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[
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OPENACC_[]_AC_LANG_PREFIX[]FLAGS=
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if test "$enable_openacc" != no; then
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AC_LANG_PUSH([C++])
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AC_CACHE_CHECK([for $[]_AC_CC[] option to support Openacc],
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[ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc],
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[ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc='not found'
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dnl Try these flags:
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dnl (on by default) ''
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dnl GCC >= 4.2 -fopenacc
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dnl SunPRO C -xopenacc
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dnl Intel C -openacc
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dnl SGI C, PGI C -mp
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dnl Tru64 Compaq C -omp
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dnl IBM XL C (AIX, Linux) -qsmp=omp
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dnl Cray CCE -homp
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dnl NEC SX -Popenacc
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dnl Lahey Fortran (Linux) --openacc
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for ac_option in '' -fopenacc -openacc -acc; do
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ac_save_[]_AC_LANG_PREFIX[]FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
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_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $ac_option"
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AC_COMPILE_IFELSE([
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#ifndef _OPENACC
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#error "OpenACC not supported"
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#endif
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#include <openacc.h>
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int main (void) { acc_init (acc_get_device_type()); return 0;}
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],
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[AC_LINK_IFELSE([
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#ifndef _OPENACC
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#error "OpenACC not supported"
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#endif
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#include <openacc.h>
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int main (void) { acc_init (acc_get_device_type()); return 0;}
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],
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[ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc=$ac_option],
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[ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc='unsupported'])])
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_AC_LANG_PREFIX[]FLAGS=$ac_save_[]_AC_LANG_PREFIX[]FLAGS
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if test "$ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc" != 'not found'; then
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break
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fi
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done
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if test "$ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc" = 'not found'; then
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ac_cv_prog_[]_AC_LANG_ABBREV[]_openacc='unsupported'
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elif test "$ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc" = ''; then
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ac_cv_prog_[]_AC_LANG_ABBREV[]_openacc='none needed'
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fi
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dnl _AX_OPENACC_SAFE_WD checked that these files did not exist before we
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dnl started probing for Openacc support, so if they exist now, they were
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dnl created by the probe loop and it's safe to delete them.
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rm -f penmp mp])
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if test "$ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc" != 'unsupported' && \
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test "$ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc" != 'none needed'; then
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OPENACC_[]_AC_LANG_PREFIX[]FLAGS="$ax_cv_prog_[]_AC_LANG_ABBREV[]_openacc"
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fi
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AC_LANG_POP([C++])
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fi
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])
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dnl _AC_OPENACC_SAFE_WD
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dnl ------------------
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dnl AC_REQUIREd by AC_OPENACC. Checks both at autoconf time and at
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dnl configure time for files that AC_OPENACC clobbers.
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dnl AC_DEFUN([_AX_OPENACC_SAFE_WD],
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dnl [m4_syscmd([test ! -e penmp && test ! -e mp])]dnl
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dnl [m4_if(sysval, [0], [], [m4_fatal(m4_normalize(
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dnl [AX_OPENACC clobbers files named 'mp' and 'penmp'.
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dnl To use AX_OPENACC you must not have either of these files
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dnl at the top level of your source tree.]))])]dnl
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dnl [if test -e penmp || test -e mp; then
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dnl AC_MSG_ERROR(m4_normalize(
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dnl [AX@&t@_OPENACC clobbers files named 'mp' and 'penmp'.
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dnl Aborting configure because one of these files already exists.]))
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dnl fi])
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