X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffrexpl.m4;h=e2722910c1219eefaa88de50f393c32e94d7046f;hb=cd56634a4a8179fd5a4419fbb3e27211b042ab1c;hp=a4f2bd8cc695c47f00309f2b66cfd8b694392fb6;hpb=6ead6fb5989d246b06d28ae343cc1e8a319c1676;p=gnulib.git diff --git a/m4/frexpl.m4 b/m4/frexpl.m4 index a4f2bd8cc..e2722910c 100644 --- a/m4/frexpl.m4 +++ b/m4/frexpl.m4 @@ -1,5 +1,5 @@ -# frexpl.m4 serial 7 -dnl Copyright (C) 2007-2008 Free Software Foundation, Inc. +# frexpl.m4 serial 20 +dnl Copyright (C) 2007-2014 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. @@ -7,55 +7,63 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_FREXPL], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) + AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) + + dnl Persuade glibc to declare frexpl(). + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + + dnl Check whether it's declared. + dnl Mac OS X 10.3 has frexpl() in libc but doesn't declare it in . + AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include ]]) + FREXPL_LIBM= - AC_CACHE_CHECK([whether frexpl() can be used without linking with libm], - [gl_cv_func_frexpl_no_libm], - [ - AC_TRY_LINK([#include - long double x;], - [int e; return frexpl (x, &e) > 0;], - [gl_cv_func_frexpl_no_libm=yes], - [gl_cv_func_frexpl_no_libm=no]) - ]) - if test $gl_cv_func_frexpl_no_libm = no; then - AC_CACHE_CHECK([whether frexpl() can be used with libm], - [gl_cv_func_frexpl_in_libm], - [ - save_LIBS="$LIBS" - LIBS="$LIBS -lm" - AC_TRY_LINK([#include - long double x;], - [int e; return frexpl (x, &e) > 0;], - [gl_cv_func_frexpl_in_libm=yes], - [gl_cv_func_frexpl_in_libm=no]) - LIBS="$save_LIBS" - ]) - if test $gl_cv_func_frexpl_in_libm = yes; then - FREXPL_LIBM=-lm + if test $HAVE_DECL_FREXPL = 1; then + gl_CHECK_FREXPL_NO_LIBM + if test $gl_cv_func_frexpl_no_libm = no; then + AC_CACHE_CHECK([whether frexpl() can be used with libm], + [gl_cv_func_frexpl_in_libm], + [ + save_LIBS="$LIBS" + LIBS="$LIBS -lm" + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include + long double x;]], + [[int e; return frexpl (x, &e) > 0;]])], + [gl_cv_func_frexpl_in_libm=yes], + [gl_cv_func_frexpl_in_libm=no]) + LIBS="$save_LIBS" + ]) + if test $gl_cv_func_frexpl_in_libm = yes; then + FREXPL_LIBM=-lm + fi + fi + if test $gl_cv_func_frexpl_no_libm = yes \ + || test $gl_cv_func_frexpl_in_libm = yes; then + save_LIBS="$LIBS" + LIBS="$LIBS $FREXPL_LIBM" + gl_FUNC_FREXPL_WORKS + LIBS="$save_LIBS" + case "$gl_cv_func_frexpl_works" in + *yes) gl_func_frexpl=yes ;; + *) gl_func_frexpl=no; REPLACE_FREXPL=1 ;; + esac + else + gl_func_frexpl=no + fi + if test $gl_func_frexpl = yes; then + AC_DEFINE([HAVE_FREXPL], [1], + [Define if the frexpl() function is available.]) fi fi - if test $gl_cv_func_frexpl_no_libm = yes \ - || test $gl_cv_func_frexpl_in_libm = yes; then - save_LIBS="$LIBS" - LIBS="$LIBS $FREXPL_LIBM" - gl_FUNC_FREXPL_WORKS - LIBS="$save_LIBS" - case "$gl_cv_func_frexpl_works" in - *yes) gl_func_frexpl=yes ;; - *) gl_func_frexpl=no; REPLACE_FREXPL=1; FREXPL_LIBM= ;; - esac - else - gl_func_frexpl=no - fi - if test $gl_func_frexpl = yes; then - AC_DEFINE([HAVE_FREXPL], 1, - [Define if the frexpl() function is available.]) - dnl Also check whether it's declared. - dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in . - AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include ]) - else - HAVE_DECL_FREXPL=0 - AC_LIBOBJ([frexpl]) + if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl = no; then + dnl Find libraries needed to link lib/frexpl.c. + if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then + AC_REQUIRE([gl_FUNC_FREXP]) + FREXPL_LIBM="$FREXP_LIBM" + else + FREXPL_LIBM= + fi fi AC_SUBST([FREXPL_LIBM]) ]) @@ -63,41 +71,50 @@ AC_DEFUN([gl_FUNC_FREXPL], AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) + AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) + dnl Check whether it's declared. + dnl Mac OS X 10.3 has frexpl() in libc but doesn't declare it in . + AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include ]]) + if test $HAVE_DECL_FREXPL = 1; then + gl_CHECK_FREXPL_NO_LIBM + if test $gl_cv_func_frexpl_no_libm = yes; then + gl_FUNC_FREXPL_WORKS + case "$gl_cv_func_frexpl_works" in + *yes) gl_func_frexpl_no_libm=yes ;; + *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;; + esac + else + gl_func_frexpl_no_libm=no + dnl Set REPLACE_FREXPL here because the system may have frexpl in libm. + REPLACE_FREXPL=1 + fi + if test $gl_func_frexpl_no_libm = yes; then + AC_DEFINE([HAVE_FREXPL_IN_LIBC], [1], + [Define if the frexpl() function is available in libc.]) + fi + fi +]) + +dnl Test whether frexpl() can be used without linking with libm. +dnl Set gl_cv_func_frexpl_no_libm to 'yes' or 'no' accordingly. +AC_DEFUN([gl_CHECK_FREXPL_NO_LIBM], +[ AC_CACHE_CHECK([whether frexpl() can be used without linking with libm], [gl_cv_func_frexpl_no_libm], [ - AC_TRY_LINK([#include - long double x;], - [int e; return frexpl (x, &e) > 0;], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include + long double x;]], + [[int e; return frexpl (x, &e) > 0;]])], [gl_cv_func_frexpl_no_libm=yes], [gl_cv_func_frexpl_no_libm=no]) ]) - if test $gl_cv_func_frexpl_no_libm = yes; then - gl_FUNC_FREXPL_WORKS - case "$gl_cv_func_frexpl_works" in - *yes) gl_func_frexpl_no_libm=yes ;; - *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;; - esac - else - gl_func_frexpl_no_libm=no - dnl Set REPLACE_FREXPL here because the system may have frexpl in libm. - REPLACE_FREXPL=1 - fi - if test $gl_func_frexpl_no_libm = yes; then - AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1, - [Define if the frexpl() function is available in libc.]) - dnl Also check whether it's declared. - dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in . - AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include ]) - else - HAVE_DECL_FREXPL=0 - AC_LIBOBJ([frexpl]) - fi ]) dnl Test whether frexpl() works on finite numbers (this fails on -dnl MacOS X 10.4/PowerPC, on AIX 5.1, and on BeOS), on denormalized numbers -dnl (this fails on MacOS X 10.5/i386), and also on infinite numbers (this +dnl Mac OS X 10.4/PowerPC, on AIX 5.1, and on BeOS), on denormalized numbers +dnl (this fails on Mac OS X 10.5/i386), and also on infinite numbers (this dnl fails e.g. on IRIX 6.5 and mingw). AC_DEFUN([gl_FUNC_FREXPL_WORKS], [ @@ -105,11 +122,37 @@ AC_DEFUN([gl_FUNC_FREXPL_WORKS], AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether frexpl works], [gl_cv_func_frexpl_works], [ - AC_TRY_RUN([ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include #include -extern long double frexpl (long double, int *); +/* Override the values of , like done in float.in.h. */ +#if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__) +# undef LDBL_MIN_EXP +# define LDBL_MIN_EXP (-16381) +#endif +#if defined __i386__ && defined __FreeBSD__ +# undef LDBL_MIN_EXP +# define LDBL_MIN_EXP (-16381) +#endif +#if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__ +# undef LDBL_MIN_EXP +# define LDBL_MIN_EXP DBL_MIN_EXP +#endif +#if defined __sgi && (LDBL_MANT_DIG >= 106) +# if defined __GNUC__ +# undef LDBL_MIN_EXP +# define LDBL_MIN_EXP DBL_MIN_EXP +# endif +#endif +extern +#ifdef __cplusplus +"C" +#endif +long double frexpl (long double, int *); int main() { + int result = 0; volatile long double x; /* Test on finite numbers that fails on AIX 5.1. */ x = 16.0L; @@ -117,9 +160,9 @@ int main() int exp = -9999; frexpl (x, &exp); if (exp != 5) - return 1; + result |= 1; } - /* Test on finite numbers that fails on MacOS X 10.4, because its frexpl + /* Test on finite numbers that fails on Mac OS X 10.4, because its frexpl function returns an invalid (incorrectly normalized) value: it returns y = { 0x3fe028f5, 0xc28f5c28, 0x3c9eb851, 0xeb851eb8 } but the correct result is @@ -129,7 +172,7 @@ int main() int exp = -9999; long double y = frexpl (x, &exp); if (!(exp == 1 && y == 0.505L)) - return 1; + result |= 2; } /* Test on large finite numbers. This fails on BeOS at i = 16322, while LDBL_MAX_EXP = 16384. @@ -142,7 +185,10 @@ int main() int exp = -9999; frexpl (x, &exp); if (exp != i) - return 1; + { + result |= 4; + break; + } } } /* Test on denormalized numbers. */ @@ -155,9 +201,9 @@ int main() int exp; long double y = frexpl (x, &exp); /* On machines with IEEE854 arithmetic: x = 1.68105e-4932, - exp = -16382, y = 0.5. On MacOS X 10.5: exp = -16384, y = 0.5. */ + exp = -16382, y = 0.5. On Mac OS X 10.5: exp = -16384, y = 0.5. */ if (exp != LDBL_MIN_EXP - 1) - return 1; + result |= 8; } } /* Test on infinite numbers. */ @@ -166,15 +212,20 @@ int main() int exp; long double y = frexpl (x, &exp); if (y != x) - return 1; + result |= 16; } - return 0; -}], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no], - [case "$host_os" in - aix* | beos* | darwin* | irix* | mingw* | pw*) - gl_cv_func_frexpl_works="guessing no";; - *) gl_cv_func_frexpl_works="guessing yes";; - esac - ]) + return result; +}]])], + [gl_cv_func_frexpl_works=yes], + [gl_cv_func_frexpl_works=no], + [ +changequote(,)dnl + case "$host_os" in + aix | aix[3-6]* | beos* | darwin* | irix* | mingw* | pw*) + gl_cv_func_frexpl_works="guessing no";; + *) gl_cv_func_frexpl_works="guessing yes";; + esac +changequote([,])dnl + ]) ]) ])