| 1 | # float_h.m4 serial 12
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| 2 | dnl Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | AC_DEFUN([gl_FLOAT_H],
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| 8 | [
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| 9 | AC_REQUIRE([AC_PROG_CC])
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| 10 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 11 | FLOAT_H=
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| 12 | REPLACE_FLOAT_LDBL=0
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| 13 | case "$host_os" in
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| 14 | aix* | beos* | openbsd* | mirbsd* | irix*)
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| 15 | FLOAT_H=float.h
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| 16 | ;;
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| 17 | freebsd* | dragonfly*)
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| 18 | case "$host_cpu" in
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| 19 | changequote(,)dnl
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| 20 | i[34567]86 )
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| 21 | changequote([,])dnl
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| 22 | FLOAT_H=float.h
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| 23 | ;;
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| 24 | x86_64 )
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| 25 | # On x86_64 systems, the C compiler may still be generating
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| 26 | # 32-bit code.
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| 27 | AC_COMPILE_IFELSE(
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| 28 | [AC_LANG_SOURCE(
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| 29 | [[#if defined __LP64__ || defined __x86_64__ || defined __amd64__
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| 30 | int ok;
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| 31 | #else
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| 32 | error fail
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| 33 | #endif
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| 34 | ]])],
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| 35 | [],
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| 36 | [FLOAT_H=float.h])
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| 37 | ;;
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| 38 | esac
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| 39 | ;;
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| 40 | linux*)
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| 41 | case "$host_cpu" in
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| 42 | powerpc*)
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| 43 | FLOAT_H=float.h
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| 44 | ;;
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| 45 | esac
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| 46 | ;;
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| 47 | esac
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| 48 | case "$host_os" in
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| 49 | aix* | freebsd* | dragonfly* | linux*)
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| 50 | if test -n "$FLOAT_H"; then
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| 51 | REPLACE_FLOAT_LDBL=1
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| 52 | fi
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| 53 | ;;
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| 54 | esac
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| 55 |
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| 56 | dnl Test against glibc-2.7 Linux/SPARC64 bug.
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| 57 | REPLACE_ITOLD=0
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| 58 | AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works],
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| 59 | [gl_cv_func_itold_works],
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| 60 | [
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| 61 | AC_RUN_IFELSE(
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| 62 | [AC_LANG_SOURCE([[
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| 63 | int i = -1;
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| 64 | volatile long double ld;
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| 65 | int main ()
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| 66 | {
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| 67 | ld += i * 1.0L;
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| 68 | if (ld > 0)
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| 69 | return 1;
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| 70 | return 0;
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| 71 | }]])],
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| 72 | [gl_cv_func_itold_works=yes],
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| 73 | [gl_cv_func_itold_works=no],
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| 74 | [case "$host" in
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| 75 | sparc*-*-linux*)
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| 76 | AC_COMPILE_IFELSE(
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| 77 | [AC_LANG_SOURCE(
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| 78 | [[#if defined __LP64__ || defined __arch64__
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| 79 | int ok;
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| 80 | #else
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| 81 | error fail
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| 82 | #endif
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| 83 | ]])],
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| 84 | [gl_cv_func_itold_works="guessing no"],
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| 85 | [gl_cv_func_itold_works="guessing yes"])
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| 86 | ;;
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| 87 | # Guess yes on native Windows.
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| 88 | mingw*) gl_cv_func_itold_works="guessing yes" ;;
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| 89 | *) gl_cv_func_itold_works="guessing yes" ;;
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| 90 | esac
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| 91 | ])
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| 92 | ])
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| 93 | case "$gl_cv_func_itold_works" in
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| 94 | *no)
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| 95 | REPLACE_ITOLD=1
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| 96 | dnl We add the workaround to <float.h> but also to <math.h>,
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| 97 | dnl to increase the chances that the fix function gets pulled in.
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| 98 | FLOAT_H=float.h
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| 99 | ;;
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| 100 | esac
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| 101 |
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| 102 | if test -n "$FLOAT_H"; then
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| 103 | gl_NEXT_HEADERS([float.h])
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| 104 | fi
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| 105 | AC_SUBST([FLOAT_H])
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| 106 | AM_CONDITIONAL([GL_GENERATE_FLOAT_H], [test -n "$FLOAT_H"])
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| 107 | AC_SUBST([REPLACE_ITOLD])
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| 108 | ])
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