106 lines
2.8 KiB
Text
106 lines
2.8 KiB
Text
# float_h.m4 serial 13
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dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FLOAT_H],
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[
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_CANONICAL_HOST])
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GL_GENERATE_FLOAT_H=false
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REPLACE_FLOAT_LDBL=0
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case "$host_os" in
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aix* | beos* | openbsd* | mirbsd* | irix*)
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GL_GENERATE_FLOAT_H=true
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;;
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freebsd* | dragonfly*)
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case "$host_cpu" in
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changequote(,)dnl
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i[34567]86 )
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changequote([,])dnl
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GL_GENERATE_FLOAT_H=true
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;;
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x86_64 )
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# On x86_64 systems, the C compiler may still be generating
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# 32-bit code.
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AC_COMPILE_IFELSE(
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[AC_LANG_SOURCE(
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[[#if defined __LP64__ || defined __x86_64__ || defined __amd64__
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int ok;
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#else
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error fail
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#endif
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]])],
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[],
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[GL_GENERATE_FLOAT_H=true])
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;;
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esac
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;;
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linux*)
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case "$host_cpu" in
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powerpc*)
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GL_GENERATE_FLOAT_H=true
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;;
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esac
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;;
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esac
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case "$host_os" in
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aix* | freebsd* | dragonfly* | linux*)
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if $GL_GENERATE_FLOAT_H; then
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REPLACE_FLOAT_LDBL=1
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fi
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;;
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esac
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dnl Test against glibc-2.7 Linux/SPARC64 bug.
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REPLACE_ITOLD=0
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AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works],
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[gl_cv_func_itold_works],
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[
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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int i = -1;
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volatile long double ld;
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int main ()
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{
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ld += i * 1.0L;
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if (ld > 0)
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return 1;
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return 0;
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}]])],
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[gl_cv_func_itold_works=yes],
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[gl_cv_func_itold_works=no],
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[case "$host" in
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sparc*-*-linux*)
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AC_COMPILE_IFELSE(
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[AC_LANG_SOURCE(
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[[#if defined __LP64__ || defined __arch64__
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int ok;
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#else
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error fail
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#endif
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]])],
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[gl_cv_func_itold_works="guessing no"],
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[gl_cv_func_itold_works="guessing yes"])
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;;
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# Guess yes on native Windows.
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mingw*) gl_cv_func_itold_works="guessing yes" ;;
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*) gl_cv_func_itold_works="guessing yes" ;;
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esac
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])
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])
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case "$gl_cv_func_itold_works" in
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*no)
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REPLACE_ITOLD=1
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dnl We add the workaround to <float.h> but also to <math.h>,
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dnl to increase the chances that the fix function gets pulled in.
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GL_GENERATE_FLOAT_H=true
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;;
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esac
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if $GL_GENERATE_FLOAT_H; then
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gl_NEXT_HEADERS([float.h])
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fi
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AC_SUBST([REPLACE_ITOLD])
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])
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