diff options
Diffstat (limited to 'gnulib-m4/ldexpl.m4')
| -rw-r--r-- | gnulib-m4/ldexpl.m4 | 107 |
1 files changed, 75 insertions, 32 deletions
diff --git a/gnulib-m4/ldexpl.m4 b/gnulib-m4/ldexpl.m4 index d84b50ff..30547db9 100644 --- a/gnulib-m4/ldexpl.m4 +++ b/gnulib-m4/ldexpl.m4 @@ -1,5 +1,5 @@ -# ldexpl.m4 serial 5 -dnl Copyright (C) 2007-2010 Free Software Foundation, Inc. +# ldexpl.m4 serial 16 +dnl Copyright (C) 2007-2015 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. @@ -7,29 +7,30 @@ 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 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>]) + 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>]]) + LDEXPL_LIBM= if test $HAVE_DECL_LDEXPL = 1; then - 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]) - ]) + gl_CHECK_LDEXPL_NO_LIBM 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="$LIBS -lm" - AC_TRY_LINK([#include <math.h> - long double x;], - [return ldexpl (x, -1) > 0;], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <math.h> + long double x;]], + [[return ldexpl (x, -1) > 0;]])], [gl_cv_func_ldexpl_in_libm=yes], [gl_cv_func_ldexpl_in_libm=no]) LIBS="$save_LIBS" @@ -46,7 +47,7 @@ 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; LDEXPL_LIBM= ;; + *) gl_func_ldexpl=no; REPLACE_LDEXPL=1 ;; esac else gl_func_ldexpl=no @@ -57,34 +58,76 @@ AC_DEFUN([gl_FUNC_LDEXPL], fi fi if test $HAVE_DECL_LDEXPL = 0 || test $gl_func_ldexpl = no; then - AC_LIBOBJ([ldexpl]) + 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="$ISNANL_LIBM" + fi fi AC_SUBST([LDEXPL_LIBM]) ]) +dnl Test whether ldexpl() can be used without linking with libm. +dnl Set gl_cv_func_ldexpl_no_libm to 'yes' or 'no' accordingly. +AC_DEFUN([gl_CHECK_LDEXPL_NO_LIBM], +[ + AC_CACHE_CHECK([whether ldexpl() can be used without linking with libm], + [gl_cv_func_ldexpl_no_libm], + [ + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <math.h> + long double x;]], + [[return ldexpl (x, -1) > 0;]])], + [gl_cv_func_ldexpl_no_libm=yes], + [gl_cv_func_ldexpl_no_libm=no]) + ]) +]) + dnl Test whether ldexpl() works on finite numbers (this fails on AIX 5.1 -dnl and MacOS X 10.4/PowerPC). +dnl and Mac OS X 10.4/PowerPC). AC_DEFUN([gl_FUNC_LDEXPL_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether ldexpl works], [gl_cv_func_ldexpl_works], [ - AC_TRY_RUN([ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ #include <math.h> -extern long double ldexpl (long double, int); +extern +#ifdef __cplusplus +"C" +#endif +long double ldexpl (long double, int); int main() { - volatile long double x1 = 1.0; - volatile long double y1 = ldexpl (x1, -1); - volatile long double x2 = 1.73205L; - volatile long double y2 = ldexpl (x2, 0); - return (y1 != 0.5L) || (y2 != x2); -}], [gl_cv_func_ldexpl_works=yes], [gl_cv_func_ldexpl_works=no], - [case "$host_os" in - aix*) gl_cv_func_ldexpl_works="guessing no";; - *) gl_cv_func_ldexpl_works="guessing yes";; - esac - ]) + 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 + ]) ]) ]) |