Mercurial > gnulib
view m4/logf.m4 @ 39194:a84ae461a2f6
Add cross-compilation results for GNU/Hurd.
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author | Samuel Thibault <samuel.thibault@gnu.org> |
---|---|
date | Fri, 29 Dec 2017 17:30:07 +0100 |
parents | 5c951c71f25c |
children | 10eb9086bea0 |
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# logf.m4 serial 9 dnl Copyright (C) 2011-2017 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_LOGF], [ m4_divert_text([DEFAULTS], [gl_logf_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_FUNC_LOG]) dnl Persuade glibc <math.h> to declare logf(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether logf() exists. Assume that logf(), if it exists, is dnl defined in the same library as log(). save_LIBS="$LIBS" LIBS="$LIBS $LOG_LIBM" AC_CHECK_FUNCS([logf]) LIBS="$save_LIBS" if test $ac_cv_func_logf = yes; then LOGF_LIBM="$LOG_LIBM" save_LIBS="$LIBS" LIBS="$LIBS $LOGF_LIBM" gl_FUNC_LOGF_WORKS LIBS="$save_LIBS" case "$gl_cv_func_logf_works" in *yes) ;; *) REPLACE_LOGF=1 ;; esac m4_ifdef([gl_FUNC_LOGF_IEEE], [ if test $gl_logf_required = ieee && test $REPLACE_LOGF = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether logf works according to ISO C 99 with IEC 60559], [gl_cv_func_logf_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $LOGF_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> /* Compare two numbers with ==. This is a separate function because IRIX 6.5 "cc -O" miscompiles an 'x == x' test. */ static int numeric_equal (float x, float y) { return x == y; } static float dummy (float x) { return 0; } int main (int argc, char *argv[]) { float (*my_logf) (float) = argc ? logf : dummy; /* Test logf(negative). This test fails on NetBSD 5.1. */ float y = my_logf (-1.0f); if (numeric_equal (y, y)) return 1; return 0; } ]])], [gl_cv_func_logf_ieee=yes], [gl_cv_func_logf_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_logf_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_logf_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_logf_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_logf_ieee" in *yes) ;; *) REPLACE_LOGF=1 ;; esac fi ]) else HAVE_LOGF=0 dnl If the function is declared but does not appear to exist, it may be dnl defined as an inline function. In order to avoid a conflict, we have dnl to define rpl_logf, not logf. AC_CHECK_DECLS([logf], [REPLACE_LOGF=1], , [[#include <math.h>]]) fi if test $HAVE_LOGF = 0 || test $REPLACE_LOGF = 1; then dnl Find libraries needed to link lib/logf.c. if test $HAVE_LOGF = 0; then LOGF_LIBM="$LOG_LIBM" fi fi AC_SUBST([LOGF_LIBM]) ]) dnl Test whether logf() works. dnl On OSF/1 5.1, logf(-0.0f) is NaN. AC_DEFUN([gl_FUNC_LOGF_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether logf works], [gl_cv_func_logf_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <math.h> volatile float x; float y; int main () { x = -0.0f; y = logf (x); if (!(y + y == y)) return 1; return 0; } ]])], [gl_cv_func_logf_works=yes], [gl_cv_func_logf_works=no], [case "$host_os" in osf*) gl_cv_func_logf_works="guessing no" ;; # Guess yes on native Windows. mingw*) gl_cv_func_logf_works="guessing yes" ;; *) gl_cv_func_logf_works="guessing yes" ;; esac ]) ]) ])