| Ying Wang | 0543663 | 2013-04-05 16:01:00 -0700 | [diff] [blame] | 1 | # float_h.m4 serial 9 |
| 2 | dnl Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc. |
| 3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, |
| 5 | dnl with or without modifications, as long as this notice is preserved. |
| 6 | |
| 7 | AC_DEFUN([gl_FLOAT_H], |
| 8 | [ |
| 9 | AC_REQUIRE([AC_PROG_CC]) |
| 10 | AC_REQUIRE([AC_CANONICAL_HOST]) |
| 11 | FLOAT_H= |
| 12 | REPLACE_FLOAT_LDBL=0 |
| 13 | case "$host_os" in |
| 14 | aix* | beos* | openbsd* | mirbsd* | irix*) |
| 15 | FLOAT_H=float.h |
| 16 | ;; |
| 17 | freebsd*) |
| 18 | case "$host_cpu" in |
| 19 | changequote(,)dnl |
| 20 | i[34567]86 ) |
| 21 | changequote([,])dnl |
| 22 | FLOAT_H=float.h |
| 23 | ;; |
| 24 | x86_64 ) |
| 25 | # On x86_64 systems, the C compiler may still be generating |
| 26 | # 32-bit code. |
| 27 | AC_EGREP_CPP([yes], |
| 28 | [#if defined __LP64__ || defined __x86_64__ || defined __amd64__ |
| 29 | yes |
| 30 | #endif], |
| 31 | [], |
| 32 | [FLOAT_H=float.h]) |
| 33 | ;; |
| 34 | esac |
| 35 | ;; |
| 36 | linux*) |
| 37 | case "$host_cpu" in |
| 38 | powerpc*) |
| 39 | FLOAT_H=float.h |
| 40 | ;; |
| 41 | esac |
| 42 | ;; |
| 43 | esac |
| 44 | case "$host_os" in |
| 45 | aix* | freebsd* | linux*) |
| 46 | if test -n "$FLOAT_H"; then |
| 47 | REPLACE_FLOAT_LDBL=1 |
| 48 | fi |
| 49 | ;; |
| 50 | esac |
| 51 | |
| 52 | dnl Test against glibc-2.7 Linux/SPARC64 bug. |
| 53 | REPLACE_ITOLD=0 |
| 54 | AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works], |
| 55 | [gl_cv_func_itold_works], |
| 56 | [ |
| 57 | AC_RUN_IFELSE( |
| 58 | [AC_LANG_SOURCE([[ |
| 59 | int i = -1; |
| 60 | volatile long double ld; |
| 61 | int main () |
| 62 | { |
| 63 | ld += i * 1.0L; |
| 64 | if (ld > 0) |
| 65 | return 1; |
| 66 | return 0; |
| 67 | }]])], |
| 68 | [gl_cv_func_itold_works=yes], |
| 69 | [gl_cv_func_itold_works=no], |
| 70 | [case "$host" in |
| 71 | sparc*-*-linux*) |
| 72 | AC_EGREP_CPP([yes], |
| 73 | [#if defined __LP64__ || defined __arch64__ |
| 74 | yes |
| 75 | #endif], |
| 76 | [gl_cv_func_itold_works="guessing no"], |
| 77 | [gl_cv_func_itold_works="guessing yes"]) |
| 78 | ;; |
| 79 | *) gl_cv_func_itold_works="guessing yes" ;; |
| 80 | esac |
| 81 | ]) |
| 82 | ]) |
| 83 | case "$gl_cv_func_itold_works" in |
| 84 | *no) |
| 85 | REPLACE_ITOLD=1 |
| 86 | dnl We add the workaround to <float.h> but also to <math.h>, |
| 87 | dnl to increase the chances that the fix function gets pulled in. |
| 88 | FLOAT_H=float.h |
| 89 | ;; |
| 90 | esac |
| 91 | |
| 92 | if test -n "$FLOAT_H"; then |
| 93 | gl_NEXT_HEADERS([float.h]) |
| 94 | fi |
| 95 | AC_SUBST([FLOAT_H]) |
| 96 | AM_CONDITIONAL([GL_GENERATE_FLOAT_H], [test -n "$FLOAT_H"]) |
| 97 | AC_SUBST([REPLACE_ITOLD]) |
| 98 | ]) |
