Mercurial > gnulib
view m4/qsort_r.m4 @ 40212:8da9577294da
unistr/*, uniconv/*: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size.
* lib/unistr/u-cpy-alloc.h (FUNC): Likewise.
* lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise.
* lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author | Bruno Haible <bruno@clisp.org> |
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date | Sat, 09 Mar 2019 00:01:47 +0100 |
parents | b06060465f09 |
children |
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dnl Reentrant sort function. dnl Copyright 2014-2019 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 Written by Paul Eggert. AC_DEFUN([gl_FUNC_QSORT_R], [ dnl Persuade glibc to declare qsort_r. AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) AC_CHECK_FUNCS_ONCE([qsort_r]) if test $ac_cv_func_qsort_r = yes; then AC_CACHE_CHECK([for qsort_r signature], [gl_cv_qsort_r_signature], [AC_LINK_IFELSE( [AC_LANG_PROGRAM([[#include <stdlib.h> void qsort_r (void *, size_t, size_t, int (*) (void const *, void const *, void *), void *); void (*p) (void *, size_t, size_t, int (*) (void const *, void const *, void *), void *) = qsort_r; ]])], [gl_cv_qsort_r_signature=GNU], [AC_LINK_IFELSE( [AC_LANG_PROGRAM([[#include <stdlib.h> void qsort_r (void *, size_t, size_t, void *, int (*) (void *, void const *, void const *)); void (*p) (void *, size_t, size_t, void *, int (*) (void *, void const *, void const *)) = qsort_r; ]])], [gl_cv_qsort_r_signature=BSD], [gl_cv_qsort_r_signature=unknown])])]) case $gl_cv_qsort_r_signature in GNU) ;; BSD) REPLACE_QSORT_R=1 ;; unknown) HAVE_QSORT_R=0 REPLACE_QSORT_R=1 ;; esac else HAVE_QSORT_R=0 fi ])