+2012-03-07 Bruno Haible <bruno@clisp.org>
+
+ roundf: Don't override undeclared system function on IRIX 6.5.
+ * m4/roundf.m4 (gl_FUNC_ROUNDF): Search for roundf() in the libraries
+ also when it is not declared. Set HAVE_ROUNDF. For replacement code,
+ test HAVE_ROUNDF, not HAVE_DECL_ROUNDF.
+ * modules/roundf (configure.ac): For replacement code, test
+ HAVE_ROUNDF, not HAVE_DECL_ROUNDF.
+ (Depends-on): Update conditions.
+ * modules/roundf-ieee (Depends-on): Update conditions.
+ * doc/posix-functions/roundf.texi: Mention the IRIX problem.
+
2012-03-07 Bruno Haible <bruno@clisp.org>
round: Don't override undeclared system function on IRIX 6.5.
@itemize
@item
This function is missing on some platforms:
-FreeBSD 5.2.1, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 4.0, Solaris 9, MSVC 9, Interix 3.5.
+FreeBSD 5.2.1, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, older IRIX 6.5, OSF/1 4.0, Solaris 9, MSVC 9, Interix 3.5.
@item
This function is not declared on some platforms:
-glibc 2.8, OSF/1 5.1.
+glibc 2.8, IRIX 6.5, OSF/1 5.1.
@item
This functions returns a wrong result for x = 1/2 - 2^-25 on some platforms:
mingw.
-# roundf.m4 serial 15
+# roundf.m4 serial 16
dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
[
m4_divert_text([DEFAULTS], [gl_roundf_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+
dnl Persuade glibc <math.h> to declare roundf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_DECLS([roundf], , , [[#include <math.h>]])
- if test "$ac_cv_have_decl_roundf" = yes; then
- gl_CHECK_MATH_LIB([ROUNDF_LIBM], [x = roundf (x);])
- if test "$ROUNDF_LIBM" != missing; then
- dnl Test whether roundf() produces correct results. On mingw, for
- dnl x = 1/2 - 2^-25, the system's roundf() returns a wrong result.
- AC_REQUIRE([AC_PROG_CC])
- AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
- AC_CACHE_CHECK([whether roundf works], [gl_cv_func_roundf_works],
- [
- save_LIBS="$LIBS"
- LIBS="$LIBS $ROUNDF_LIBM"
- AC_RUN_IFELSE([AC_LANG_SOURCE([[
+
+ gl_CHECK_MATH_LIB([ROUNDF_LIBM], [x = roundf (x);],
+ [extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ float roundf (float);
+ ])
+ if test "$ROUNDF_LIBM" != missing; then
+ HAVE_ROUNDF=1
+ dnl Also check whether it's declared.
+ dnl IRIX 6.5 has roundf() in libm but doesn't declare it in <math.h>.
+ AC_CHECK_DECLS([roundf], , [HAVE_DECL_ROUNDF=0], [[#include <math.h>]])
+
+ dnl Test whether roundf() produces correct results. On mingw, for
+ dnl x = 1/2 - 2^-25, the system's roundf() returns a wrong result.
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether roundf works], [gl_cv_func_roundf_works],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $ROUNDF_LIBM"
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <float.h>
#include <math.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+float roundf (float);
#ifdef _MSC_VER
# pragma fenv_access (off)
#endif
volatile float x = 0.5f - 0.5f / TWO_MANT_DIG;
exit (x < 0.5f && roundf (x) != 0.0f);
}]])], [gl_cv_func_roundf_works=yes], [gl_cv_func_roundf_works=no],
- [case "$host_os" in
- mingw*) gl_cv_func_roundf_works="guessing no";;
- *) gl_cv_func_roundf_works="guessing yes";;
- esac
- ])
- LIBS="$save_LIBS"
+ [case "$host_os" in
+ mingw*) gl_cv_func_roundf_works="guessing no";;
+ *) gl_cv_func_roundf_works="guessing yes";;
+ esac
])
- case "$gl_cv_func_roundf_works" in
- *no) ROUNDF_LIBM=missing ;;
- esac
- fi
- if test "$ROUNDF_LIBM" = missing; then
- REPLACE_ROUNDF=1
- fi
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_roundf_works" in
+ *no) REPLACE_ROUNDF=1 ;;
+ esac
+
m4_ifdef([gl_FUNC_ROUNDF_IEEE], [
if test $gl_roundf_required = ieee && test $REPLACE_ROUNDF = 0; then
AC_CACHE_CHECK([whether roundf works according to ISO C 99 with IEC 60559],
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+float roundf (float);
]gl_FLOAT_MINUS_ZERO_CODE[
]gl_FLOAT_SIGNBIT_CODE[
static float dummy (float f) { return 0; }
fi
])
else
+ HAVE_ROUNDF=0
HAVE_DECL_ROUNDF=0
fi
- if test $HAVE_DECL_ROUNDF = 0 || test $REPLACE_ROUNDF = 1; then
+ if test $HAVE_ROUNDF = 0 || test $REPLACE_ROUNDF = 1; then
dnl Find libraries needed to link lib/roundf.c.
AC_CHECK_DECLS([ceilf, floorf], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_floorf" = yes \