| # float_h.m4 serial 13 |
| dnl Copyright (C) 2007, 2009-2022 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_FLOAT_H], |
| [ |
| AC_REQUIRE([AC_PROG_CC]) |
| AC_REQUIRE([AC_CANONICAL_HOST]) |
| GL_GENERATE_FLOAT_H=false |
| REPLACE_FLOAT_LDBL=0 |
| case "$host_os" in |
| aix* | beos* | openbsd* | mirbsd* | irix*) |
| GL_GENERATE_FLOAT_H=true |
| ;; |
| freebsd* | dragonfly*) |
| case "$host_cpu" in |
| changequote(,)dnl |
| i[34567]86 ) |
| changequote([,])dnl |
| GL_GENERATE_FLOAT_H=true |
| ;; |
| x86_64 ) |
| # On x86_64 systems, the C compiler may still be generating |
| # 32-bit code. |
| AC_COMPILE_IFELSE( |
| [AC_LANG_SOURCE( |
| [[#if defined __LP64__ || defined __x86_64__ || defined __amd64__ |
| int ok; |
| #else |
| error fail |
| #endif |
| ]])], |
| [], |
| [GL_GENERATE_FLOAT_H=true]) |
| ;; |
| esac |
| ;; |
| linux*) |
| case "$host_cpu" in |
| powerpc*) |
| GL_GENERATE_FLOAT_H=true |
| ;; |
| esac |
| ;; |
| esac |
| case "$host_os" in |
| aix* | freebsd* | dragonfly* | linux*) |
| if $GL_GENERATE_FLOAT_H; then |
| REPLACE_FLOAT_LDBL=1 |
| fi |
| ;; |
| esac |
| |
| dnl Test against glibc-2.7 Linux/SPARC64 bug. |
| REPLACE_ITOLD=0 |
| AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works], |
| [gl_cv_func_itold_works], |
| [ |
| AC_RUN_IFELSE( |
| [AC_LANG_SOURCE([[ |
| int i = -1; |
| volatile long double ld; |
| int main () |
| { |
| ld += i * 1.0L; |
| if (ld > 0) |
| return 1; |
| return 0; |
| }]])], |
| [gl_cv_func_itold_works=yes], |
| [gl_cv_func_itold_works=no], |
| [case "$host" in |
| sparc*-*-linux*) |
| AC_COMPILE_IFELSE( |
| [AC_LANG_SOURCE( |
| [[#if defined __LP64__ || defined __arch64__ |
| int ok; |
| #else |
| error fail |
| #endif |
| ]])], |
| [gl_cv_func_itold_works="guessing no"], |
| [gl_cv_func_itold_works="guessing yes"]) |
| ;; |
| # Guess yes on native Windows. |
| mingw*) gl_cv_func_itold_works="guessing yes" ;; |
| *) gl_cv_func_itold_works="guessing yes" ;; |
| esac |
| ]) |
| ]) |
| case "$gl_cv_func_itold_works" in |
| *no) |
| REPLACE_ITOLD=1 |
| dnl We add the workaround to <float.h> but also to <math.h>, |
| dnl to increase the chances that the fix function gets pulled in. |
| GL_GENERATE_FLOAT_H=true |
| ;; |
| esac |
| |
| if $GL_GENERATE_FLOAT_H; then |
| gl_NEXT_HEADERS([float.h]) |
| fi |
| AC_SUBST([REPLACE_ITOLD]) |
| ]) |
