diff options
Diffstat (limited to 'gnulib-m4/ldexpl.m4')
| -rw-r--r-- | gnulib-m4/ldexpl.m4 | 107 |
1 files changed, 32 insertions, 75 deletions
diff --git a/gnulib-m4/ldexpl.m4 b/gnulib-m4/ldexpl.m4 index 30547db9..d84b50ff 100644 --- a/gnulib-m4/ldexpl.m4 +++ b/gnulib-m4/ldexpl.m4 @@ -1,5 +1,5 @@ -# ldexpl.m4 serial 16 -dnl Copyright (C) 2007-2015 Free Software Foundation, Inc. +# ldexpl.m4 serial 5 +dnl Copyright (C) 2007-2010 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. @@ -7,30 +7,29 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_LDEXPL], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) - AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) - AC_REQUIRE([gl_FUNC_ISNANL]) dnl for ISNANL_LIBM - - dnl Persuade glibc <math.h> to declare ldexpl(). - AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) - dnl Check whether it's declared. - dnl Mac OS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>. - AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [[#include <math.h>]]) - + dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>. + AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [#include <math.h>]) LDEXPL_LIBM= if test $HAVE_DECL_LDEXPL = 1; then - gl_CHECK_LDEXPL_NO_LIBM + AC_CACHE_CHECK([whether ldexpl() can be used without linking with libm], + [gl_cv_func_ldexpl_no_libm], + [ + AC_TRY_LINK([#include <math.h> + long double x;], + [return ldexpl (x, -1) > 0;], + [gl_cv_func_ldexpl_no_libm=yes], + [gl_cv_func_ldexpl_no_libm=no]) + ]) if test $gl_cv_func_ldexpl_no_libm = no; then AC_CACHE_CHECK([whether ldexpl() can be used with libm], [gl_cv_func_ldexpl_in_libm], [ save_LIBS="$LIBS" LIBS="$LIBS -lm" - AC_LINK_IFELSE( - [AC_LANG_PROGRAM( - [[#include <math.h> - long double x;]], - [[return ldexpl (x, -1) > 0;]])], + AC_TRY_LINK([#include <math.h> + long double x;], + [return ldexpl (x, -1) > 0;], [gl_cv_func_ldexpl_in_libm=yes], [gl_cv_func_ldexpl_in_libm=no]) LIBS="$save_LIBS" @@ -47,7 +46,7 @@ AC_DEFUN([gl_FUNC_LDEXPL], LIBS="$save_LIBS" case "$gl_cv_func_ldexpl_works" in *yes) gl_func_ldexpl=yes ;; - *) gl_func_ldexpl=no; REPLACE_LDEXPL=1 ;; + *) gl_func_ldexpl=no; REPLACE_LDEXPL=1; LDEXPL_LIBM= ;; esac else gl_func_ldexpl=no @@ -58,76 +57,34 @@ AC_DEFUN([gl_FUNC_LDEXPL], fi fi if test $HAVE_DECL_LDEXPL = 0 || test $gl_func_ldexpl = no; then - dnl Find libraries needed to link lib/ldexpl.c. - if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then - AC_REQUIRE([gl_FUNC_LDEXP]) - LDEXPL_LIBM="$LDEXP_LIBM" - else - LDEXPL_LIBM="$ISNANL_LIBM" - fi + AC_LIBOBJ([ldexpl]) fi AC_SUBST([LDEXPL_LIBM]) ]) -dnl Test whether ldexpl() can be used without linking with libm. -dnl Set gl_cv_func_ldexpl_no_libm to 'yes' or 'no' accordingly. -AC_DEFUN([gl_CHECK_LDEXPL_NO_LIBM], -[ - AC_CACHE_CHECK([whether ldexpl() can be used without linking with libm], - [gl_cv_func_ldexpl_no_libm], - [ - AC_LINK_IFELSE( - [AC_LANG_PROGRAM( - [[#include <math.h> - long double x;]], - [[return ldexpl (x, -1) > 0;]])], - [gl_cv_func_ldexpl_no_libm=yes], - [gl_cv_func_ldexpl_no_libm=no]) - ]) -]) - dnl Test whether ldexpl() works on finite numbers (this fails on AIX 5.1 -dnl and Mac OS X 10.4/PowerPC). +dnl and MacOS X 10.4/PowerPC). AC_DEFUN([gl_FUNC_LDEXPL_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether ldexpl works], [gl_cv_func_ldexpl_works], [ - AC_RUN_IFELSE( - [AC_LANG_SOURCE([[ + AC_TRY_RUN([ #include <math.h> -extern -#ifdef __cplusplus -"C" -#endif -long double ldexpl (long double, int); +extern long double ldexpl (long double, int); int main() { - int result = 0; - { - volatile long double x = 1.0; - volatile long double y = ldexpl (x, -1); - if (y != 0.5L) - result |= 1; - } - { - volatile long double x = 1.73205L; - volatile long double y = ldexpl (x, 0); - if (y != x) - result |= 2; - } - return result; -}]])], - [gl_cv_func_ldexpl_works=yes], - [gl_cv_func_ldexpl_works=no], - [ -changequote(,)dnl - case "$host_os" in - aix | aix[3-6]*) gl_cv_func_ldexpl_works="guessing no";; - *) gl_cv_func_ldexpl_works="guessing yes";; - esac -changequote([,])dnl - ]) + volatile long double x1 = 1.0; + volatile long double y1 = ldexpl (x1, -1); + volatile long double x2 = 1.73205L; + volatile long double y2 = ldexpl (x2, 0); + return (y1 != 0.5L) || (y2 != x2); +}], [gl_cv_func_ldexpl_works=yes], [gl_cv_func_ldexpl_works=no], + [case "$host_os" in + aix*) gl_cv_func_ldexpl_works="guessing no";; + *) gl_cv_func_ldexpl_works="guessing yes";; + esac + ]) ]) ]) |