2c171718ae
Prevent spurious #-style comments from appearing in the generated configure script. Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
84 строки
4.4 KiB
Bash
84 строки
4.4 KiB
Bash
dnl -*- shell-script -*-
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dnl
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dnl Copyright (c) 2018-2020 FUJITSU LIMITED. All rights reserved.
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dnl Copyright (c) 2020 Cisco Systems, Inc. All rights reserved.
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dnl $COPYRIGHT$
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dnl
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dnl Additional copyrights may follow
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dnl
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dnl $HEADER$
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dnl
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dnl Check whether the user wants to use an alternate type of C 'short float'.
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dnl OPAL_CHECK_ALT_SHORT_FLOAT
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dnl ------------------------------------------------------------
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AC_DEFUN([OPAL_CHECK_ALT_SHORT_FLOAT], [
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AC_CHECK_TYPES(_Float16)
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AC_MSG_CHECKING([if want alternate C type of short float])
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AC_ARG_ENABLE(alt-short-float,
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AC_HELP_STRING([--enable-alt-short-float=TYPE],
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[Use an alternate C type TYPE of 'short float' if 'short float' is not available on the C compiler. 'short float' is a new C type proposed for the next C language standard in ISO/IEC JTC 1/SC 22 WG 14 (C WG). (default: "_Float16" if available, disabled otherwise)]))
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if test "$enable_alt_short_float" = "yes"; then
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AC_MSG_ERROR([--enable-alt-short-float must have an argument.])
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elif test "$enable_alt_short_float" = "no"; then
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:
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elif test "$enable_alt_short_float" != ""; then
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opal_short_float_type="$enable_alt_short_float"
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opal_short_float_complex_type="$enable_alt_short_float [[2]]"
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elif test "$ac_cv_type_short_float" = "yes" && \
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test "$ac_cv_type_short_float__Complex" = "yes"; then
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opal_short_float_type="short float"
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opal_short_float_complex_type="short float _Complex"
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elif test "$ac_cv_type__Float16" = "yes"; then
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opal_short_float_type="_Float16"
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opal_short_float_complex_type="_Float16 [[2]]"
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fi
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if test "$opal_short_float_type" != ""; then
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AC_MSG_RESULT([yes ($opal_short_float_type)])
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AC_CHECK_TYPES($opal_short_float_type, [opal_alt_short_float_exists=1], [opal_alt_short_float_exists=0])
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# Even if the alternate short float type exists, make sure
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# that the compiler can actually compile/link when
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# mathematical operations are performed on variables of that
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# type. Case in point: clang 6.0.x and 7.0.x need an
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# additional CLI flag added (--rtlib=compiler-rt) to enable
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# software emulation of _Float16. Open MPI will *not*
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# automagically add that flag -- we'll just emit a warning and
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# point the user to a README where more information is
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# available.
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AC_MSG_CHECKING([if compiler supports arithmetic operations on $opal_short_float_type])
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AS_IF([test $opal_alt_short_float_exists -eq 1],
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[
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static $opal_short_float_type a = 2.5, b = 3.8;
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a += b;]])],
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[AC_MSG_RESULT([yes])
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opal_enable_short_float=1],
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[AC_MSG_RESULT([no])
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AS_IF([test `basename $CC` = "clang"],
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[AC_MSG_WARN([if you are using the Clang 6.0.x or 7.0.x compilers and want])
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AC_MSG_WARN([to enable software emulation of half-precision floating point])
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AC_MSG_WARN([in conjunction with the "shortfloat" Open MPI extension,])
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AC_MSG_WARN([see the ompi/mpiext/shortfloat/README.txt file for details.])
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])
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opal_enable_short_float=0])
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])
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if test "$opal_enable_short_float" = 1; then
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AC_DEFINE_UNQUOTED(opal_short_float_t, [[$opal_short_float_type]],
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[User-selected alternate C type of short float])
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AC_DEFINE_UNQUOTED(opal_short_float_complex_t, [[$opal_short_float_complex_type]],
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[User-selected alternate C type of short float _Complex])
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AC_CHECK_TYPES(opal_short_float_t)
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AC_CHECK_TYPES(opal_short_float_complex_t)
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AC_CHECK_SIZEOF(opal_short_float_t)
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AC_CHECK_SIZEOF(opal_short_float_complex_t)
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OPAL_C_GET_ALIGNMENT(opal_short_float_t, OPAL_ALIGNMENT_OPAL_SHORT_FLOAT_T)
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elif test "$enable_alt_short_float" != ""; then
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AC_MSG_ERROR([Alternate C type of short float $opal_short_float_type requested but not available. Aborting])
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fi
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else
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AC_MSG_RESULT([no])
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fi
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])
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