| 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 | ])
|
|---|