Mercurial > gnulib
view m4/isnand.m4 @ 40214:452ab00796c7
Fix undefined behaviour.
* lib/bitrotate.h (rotl16, rotr16, rotl8, rotr8): Case x to
'unsigned int', to avoid shift operations on 'int'.
* lib/xmemdup0.c (xmemdup0): Don't invoke memcpy with a zero size.
* tests/test-count-leading-zeros.c (main): Use a random number that has
as many bits as TYPE, not only 2*15 or 2*31 bits.
* tests/test-count-trailing-zeros.c (main): Likewise.
* tests/test-count-one-bits.c (main): Likewise.
* tests/test-memmem.c: Don't include "null-ptr.h".
(main): Use zerosize_ptr() instead of null_ptr().
* modules/memmem-tests (Files): Remove tests/null-ptr.h.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 20:32:25 +0100 |
parents | b06060465f09 |
children |
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# isnand.m4 serial 11 dnl Copyright (C) 2007-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl Check how to get or define isnand(). AC_DEFUN([gl_FUNC_ISNAND], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) ISNAND_LIBM= gl_HAVE_ISNAND_NO_LIBM if test $gl_cv_func_isnand_no_libm = no; then gl_HAVE_ISNAND_IN_LIBM if test $gl_cv_func_isnand_in_libm = yes; then ISNAND_LIBM=-lm fi fi dnl The variable gl_func_isnand set here is used by isnan.m4. if test $gl_cv_func_isnand_no_libm = yes \ || test $gl_cv_func_isnand_in_libm = yes; then gl_func_isnand=yes else gl_func_isnand=no HAVE_ISNAND=0 fi AC_SUBST([ISNAND_LIBM]) ]) dnl Check how to get or define isnand() without linking with libm. AC_DEFUN([gl_FUNC_ISNAND_NO_LIBM], [ gl_HAVE_ISNAND_NO_LIBM gl_func_isnand_no_libm=$gl_cv_func_isnand_no_libm if test $gl_cv_func_isnand_no_libm = yes; then AC_DEFINE([HAVE_ISNAND_IN_LIBC], [1], [Define if the isnan(double) function is available in libc.]) fi ]) dnl Prerequisites of replacement isnand definition. It does not need -lm. AC_DEFUN([gl_PREREQ_ISNAND], [ AC_REQUIRE([gl_DOUBLE_EXPONENT_LOCATION]) ]) dnl Test whether isnand() can be used with libm. AC_DEFUN([gl_HAVE_ISNAND_IN_LIBM], [ AC_CACHE_CHECK([whether isnan(double) can be used with libm], [gl_cv_func_isnand_in_libm], [ save_LIBS="$LIBS" LIBS="$LIBS -lm" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#include <math.h> #if __GNUC__ >= 4 # undef isnand # define isnand(x) __builtin_isnan ((double)(x)) #elif defined isnan # undef isnand # define isnand(x) isnan ((double)(x)) #endif double x;]], [[return isnand (x);]])], [gl_cv_func_isnand_in_libm=yes], [gl_cv_func_isnand_in_libm=no]) LIBS="$save_LIBS" ]) ]) AC_DEFUN([gl_HAVE_ISNAND_NO_LIBM], [ AC_CACHE_CHECK([whether isnan(double) can be used without linking with libm], [gl_cv_func_isnand_no_libm], [ AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#include <math.h> #if __GNUC__ >= 4 # undef isnand # define isnand(x) __builtin_isnan ((double)(x)) #else # undef isnand # define isnand(x) isnan ((double)(x)) #endif double x;]], [[return isnand (x);]])], [gl_cv_func_isnand_no_libm=yes], [gl_cv_func_isnand_no_libm=no]) ]) ])