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3d458a81c6
Added pipe2 and open modules, to get O_CLOEXEC. * libguile/Makefile.am (guile_filter_doc_snarfage$(EXEEXT)): Add gnulib here, in the native build case, for rpl_fflush if needed. foo
86 lines
2.5 KiB
Text
86 lines
2.5 KiB
Text
# trunc.m4 serial 6
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dnl Copyright (C) 2007, 2010-2011 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_TRUNC],
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[
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m4_divert_text([DEFAULTS], [gl_trunc_required=plain])
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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dnl Persuade glibc <math.h> to declare trunc().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether trunc() is declared.
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AC_CHECK_DECLS([trunc], , , [#include <math.h>])
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if test "$ac_cv_have_decl_trunc" = yes; then
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dnl Test whether trunc() can be used without libm.
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TRUNC_LIBM=?
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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double x;]],
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[[x = trunc(x);]])],
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[TRUNC_LIBM=])
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if test "$TRUNC_LIBM" = "?"; then
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save_LIBS="$LIBS"
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LIBS="$LIBS -lm"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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double x;]],
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[[x = trunc(x);]])],
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[TRUNC_LIBM="-lm"])
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LIBS="$save_LIBS"
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fi
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if test "$TRUNC_LIBM" = "?"; then
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TRUNC_LIBM=
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fi
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m4_ifdef([gl_FUNC_TRUNC_IEEE], [
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if test $gl_trunc_required = ieee && test $REPLACE_TRUNC = 0; then
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AC_CACHE_CHECK([whether trunc works according to ISO C 99 with IEC 60559],
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[gl_cv_func_trunc_ieee],
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[
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save_LIBS="$LIBS"
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LIBS="$LIBS $TRUNC_LIBM"
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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]gl_DOUBLE_MINUS_ZERO_CODE[
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]gl_DOUBLE_SIGNBIT_CODE[
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int main()
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{
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/* Test whether trunc (-0.0) is -0.0. */
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if (signbitd (minus_zerod) && !signbitd (trunc (minus_zerod)))
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return 1;
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return 0;
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}
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]])],
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[gl_cv_func_trunc_ieee=yes],
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[gl_cv_func_trunc_ieee=no],
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[gl_cv_func_trunc_ieee="guessing no"])
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LIBS="$save_LIBS"
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])
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case "$gl_cv_func_trunc_ieee" in
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*yes) ;;
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*) REPLACE_TRUNC=1 ;;
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esac
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fi
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])
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else
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HAVE_DECL_TRUNC=0
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fi
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if test $HAVE_DECL_TRUNC = 0 || test $REPLACE_TRUNC = 1; then
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dnl No libraries are needed to link lib/trunc.c.
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TRUNC_LIBM=
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fi
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AC_SUBST([TRUNC_LIBM])
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])
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