Mercurial > gnulib
annotate m4/ilogbf.m4 @ 17363:5a51fb7777a9
sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin
Problem reported by Marco Atzeri in
<http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>.
* lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]:
Simply delegate to the system <sys/select.h> in this case too.
Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only
if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to
be needed on Solaris either.
* lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]:
Simply delgate to the system <sys/time.h> in this case.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 19 Mar 2013 09:08:47 -0700 |
| parents | e542fd46ad6f |
| children | 344018b6e5d7 |
| rev | line source |
|---|---|
| 16766 | 1 # ilogbf.m4 serial 1 |
|
17249
e542fd46ad6f
maint: update all copyright year number ranges
Eric Blake <eblake@redhat.com>
parents:
16766
diff
changeset
|
2 dnl Copyright (C) 2010-2013 Free Software Foundation, Inc. |
| 16766 | 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_FUNC_ILOGBF], | |
| 8 [ | |
| 9 AC_REQUIRE([gl_MATH_H_DEFAULTS]) | |
| 10 | |
| 11 dnl Persuade glibc <math.h> to declare ilogbf(). | |
| 12 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
| 13 | |
| 14 dnl Determine ILOGBF_LIBM. | |
| 15 gl_MATHFUNC([ilogbf], [int], [(float)]) | |
| 16 if test $gl_cv_func_ilogbf_no_libm = yes \ | |
| 17 || test $gl_cv_func_ilogbf_in_libm = yes; then | |
| 18 save_LIBS="$LIBS" | |
| 19 LIBS="$LIBS $ILOGBF_LIBM" | |
| 20 gl_FUNC_ILOGBF_WORKS | |
| 21 LIBS="$save_LIBS" | |
| 22 case "$gl_cv_func_ilogbf_works" in | |
| 23 *yes) ;; | |
| 24 *) REPLACE_ILOGBF=1 ;; | |
| 25 esac | |
| 26 else | |
| 27 HAVE_ILOGBF=0 | |
| 28 fi | |
| 29 if test $HAVE_ILOGBF = 0 || test $REPLACE_ILOGBF = 1; then | |
| 30 dnl Find libraries needed to link lib/ilogbf.c. | |
| 31 AC_REQUIRE([gl_FUNC_FREXPF]) | |
| 32 AC_REQUIRE([gl_FUNC_ISNANF]) | |
| 33 ILOGBF_LIBM= | |
| 34 dnl Append $FREXPF_LIBM to ILOGBF_LIBM, avoiding gratuitous duplicates. | |
| 35 case " $ILOGBF_LIBM " in | |
| 36 *" $FREXPF_LIBM "*) ;; | |
| 37 *) ILOGBF_LIBM="$ILOGBF_LIBM $FREXPF_LIBM" ;; | |
| 38 esac | |
| 39 dnl Append $ISNANF_LIBM to ILOGBF_LIBM, avoiding gratuitous duplicates. | |
| 40 case " $ILOGBF_LIBM " in | |
| 41 *" $ISNANF_LIBM "*) ;; | |
| 42 *) ILOGBF_LIBM="$ILOGBF_LIBM $ISNANF_LIBM" ;; | |
| 43 esac | |
| 44 fi | |
| 45 AC_SUBST([ILOGBF_LIBM]) | |
| 46 ]) | |
| 47 | |
| 48 dnl Test whether ilogbf() works. | |
| 49 dnl On OpenBSD 4.9, ilogbf(0.0) is wrong. | |
| 50 dnl On NetBSD 5.1, OpenBSD 4.9, ilogbf(Infinity) is wrong. | |
| 51 AC_DEFUN([gl_FUNC_ILOGBF_WORKS], | |
| 52 [ | |
| 53 AC_REQUIRE([AC_PROG_CC]) | |
| 54 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
| 55 AC_CACHE_CHECK([whether ilogbf works], [gl_cv_func_ilogbf_works], | |
| 56 [ | |
| 57 AC_RUN_IFELSE( | |
| 58 [AC_LANG_SOURCE([[ | |
| 59 #include <limits.h> | |
| 60 #include <math.h> | |
| 61 /* Provide FP_ILOGB0, FP_ILOGBNAN, like in math.in.h. */ | |
| 62 #if !(defined FP_ILOGB0 && defined FP_ILOGBNAN) | |
| 63 # if defined __NetBSD__ || defined __sgi | |
| 64 /* NetBSD, IRIX 6.5: match what ilogbf() does */ | |
| 65 # define FP_ILOGB0 INT_MIN | |
| 66 # define FP_ILOGBNAN INT_MIN | |
| 67 # elif defined _AIX | |
| 68 /* AIX 5.1: match what ilogbf() does in AIX >= 5.2 */ | |
| 69 # define FP_ILOGB0 INT_MIN | |
| 70 # define FP_ILOGBNAN INT_MAX | |
| 71 # elif defined __sun | |
| 72 /* Solaris 9: match what ilogbf() does */ | |
| 73 # define FP_ILOGB0 (- INT_MAX) | |
| 74 # define FP_ILOGBNAN INT_MAX | |
| 75 # endif | |
| 76 #endif | |
| 77 volatile float x; | |
| 78 static float zero; | |
| 79 static int dummy (float x) { return 0; } | |
| 80 int main (int argc, char *argv[]) | |
| 81 { | |
| 82 int (*my_ilogbf) (float) = argc ? ilogbf : dummy; | |
| 83 int result = 0; | |
| 84 /* This test fails on OpenBSD 4.9. */ | |
| 85 { | |
| 86 x = 0.0f; | |
| 87 if (my_ilogbf (x) != FP_ILOGB0) | |
| 88 result |= 1; | |
| 89 } | |
| 90 /* This test fails on NetBSD 5.1, OpenBSD 4.9. */ | |
| 91 { | |
| 92 x = 1.0f / zero; | |
| 93 if (my_ilogbf (x) != INT_MAX) | |
| 94 result |= 2; | |
| 95 } | |
| 96 return result; | |
| 97 } | |
| 98 ]])], | |
| 99 [gl_cv_func_ilogbf_works=yes], | |
| 100 [gl_cv_func_ilogbf_works=no], | |
| 101 [case "$host_os" in | |
| 102 openbsd* | netbsd*) gl_cv_func_ilogbf_works="guessing no";; | |
| 103 *) gl_cv_func_ilogbf_works="guessing yes";; | |
| 104 esac | |
| 105 ]) | |
| 106 ]) | |
| 107 ]) |