Mercurial > gnulib
view m4/log10.m4 @ 38895:70deacf7fcf4
all: Write "Solaris 11.0" instead of "Solaris 11 2011-11".
author | Bruno Haible <bruno@clisp.org> |
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date | Thu, 12 Oct 2017 17:40:54 +0200 |
parents | 5c951c71f25c |
children | 4bc5b8cefed7 |
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# log10.m4 serial 6 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_LOG10], [ m4_divert_text([DEFAULTS], [gl_log10_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) dnl Determine LOG10_LIBM. gl_COMMON_DOUBLE_MATHFUNC([log10]) save_LIBS="$LIBS" LIBS="$LIBS $LOG10_LIBM" gl_FUNC_LOG10_WORKS LIBS="$save_LIBS" case "$gl_cv_func_log10_works" in *yes) ;; *) REPLACE_LOG10=1 ;; esac m4_ifdef([gl_FUNC_LOG10_IEEE], [ if test $gl_log10_required = ieee && test $REPLACE_LOG10 = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether log10 works according to ISO C 99 with IEC 60559], [gl_cv_func_log10_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $LOG10_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> /* Compare two numbers with ==. This is a separate function because IRIX 6.5 "cc -O" miscompiles an 'x == x' test. */ static int numeric_equal (double x, double y) { return x == y; } static double dummy (double x) { return 0; } int main (int argc, char *argv[]) { double (*my_log10) (double) = argc ? log10 : dummy; /* Test log10(negative). This test fails on NetBSD 5.1, Solaris 11.0. */ double y = my_log10 (-1.0); if (numeric_equal (y, y)) return 1; return 0; } ]])], [gl_cv_func_log10_ieee=yes], [gl_cv_func_log10_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu*) gl_cv_func_log10_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_log10_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_log10_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_log10_ieee" in *yes) ;; *) REPLACE_LOG10=1 ;; esac fi ]) ]) dnl Test whether log10() works. dnl On OSF/1 5.1, log10(-0.0) is NaN. AC_DEFUN([gl_FUNC_LOG10_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether log10 works], [gl_cv_func_log10_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <math.h> volatile double x; double y; int main () { x = -0.0; y = log10 (x); if (!(y + y == y)) return 1; return 0; } ]])], [gl_cv_func_log10_works=yes], [gl_cv_func_log10_works=no], [case "$host_os" in osf*) gl_cv_func_log10_works="guessing no" ;; # Guess yes on native Windows. mingw*) gl_cv_func_log10_works="guessing yes" ;; *) gl_cv_func_log10_works="guessing yes" ;; esac ]) ]) ])