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-rw-r--r--gl/m4/float_h.m487
1 files changed, 83 insertions, 4 deletions
diff --git a/gl/m4/float_h.m4 b/gl/m4/float_h.m4
index a74a0d95..397f2d1f 100644
--- a/gl/m4/float_h.m4
+++ b/gl/m4/float_h.m4
@@ -1,5 +1,5 @@
1# float_h.m4 serial 3 1# float_h.m4 serial 9
2dnl Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc. 2dnl Copyright (C) 2007, 2009-2013 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation 3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it, 4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved. 5dnl with or without modifications, as long as this notice is preserved.
@@ -9,11 +9,90 @@ AC_DEFUN([gl_FLOAT_H],
9 AC_REQUIRE([AC_PROG_CC]) 9 AC_REQUIRE([AC_PROG_CC])
10 AC_REQUIRE([AC_CANONICAL_HOST]) 10 AC_REQUIRE([AC_CANONICAL_HOST])
11 FLOAT_H= 11 FLOAT_H=
12 REPLACE_FLOAT_LDBL=0
12 case "$host_os" in 13 case "$host_os" in
13 beos* | openbsd*) 14 aix* | beos* | openbsd* | mirbsd* | irix*)
14 FLOAT_H=float.h 15 FLOAT_H=float.h
15 gl_CHECK_NEXT_HEADERS([float.h]) 16 ;;
17 freebsd*)
18 case "$host_cpu" in
19changequote(,)dnl
20 i[34567]86 )
21changequote([,])dnl
22 FLOAT_H=float.h
23 ;;
24 x86_64 )
25 # On x86_64 systems, the C compiler may still be generating
26 # 32-bit code.
27 AC_EGREP_CPP([yes],
28 [#if defined __LP64__ || defined __x86_64__ || defined __amd64__
29 yes
30 #endif],
31 [],
32 [FLOAT_H=float.h])
33 ;;
34 esac
35 ;;
36 linux*)
37 case "$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
16 ;; 49 ;;
17 esac 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([[
59int i = -1;
60volatile long double ld;
61int 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 "$FLOAT_H"; then
93 gl_NEXT_HEADERS([float.h])
94 fi
18 AC_SUBST([FLOAT_H]) 95 AC_SUBST([FLOAT_H])
96 AM_CONDITIONAL([GL_GENERATE_FLOAT_H], [test -n "$FLOAT_H"])
97 AC_SUBST([REPLACE_ITOLD])
19]) 98])