derek.holloway
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74 lines
2.6 KiB
Plaintext
74 lines
2.6 KiB
Plaintext
# strtok_r.m4 serial 16
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dnl Copyright (C) 2002-2004, 2006-2007, 2009-2022 Free Software Foundation,
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dnl Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_STRTOK_R],
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[
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dnl The strtok_r() declaration in lib/string.in.h uses 'restrict'.
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AC_REQUIRE([AC_C_RESTRICT])
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AC_REQUIRE([gl_STRING_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CHECK_FUNCS([strtok_r])
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if test $ac_cv_func_strtok_r = yes; then
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HAVE_STRTOK_R=1
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dnl glibc 2.7 has a bug in strtok_r that causes a segmentation fault
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dnl when the second argument to strtok_r is a constant string that has
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dnl exactly one byte and compiling with optimization. This bug is, for
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dnl example, present in the glibc 2.7-18 package in Debian "lenny".
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dnl See <https://sourceware.org/bugzilla/show_bug.cgi?id=5614>.
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AC_CACHE_CHECK([whether strtok_r works], [gl_cv_func_strtok_r_works],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM([[
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#ifndef __OPTIMIZE__
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# define __OPTIMIZE__ 1
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#endif
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#undef __OPTIMIZE_SIZE__
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#undef __NO_INLINE__
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#include <stdlib.h>
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#include <string.h>
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]],
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[[static const char dummy[] = "\177\01a";
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char delimiters[] = "xxxxxxxx";
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char *save_ptr = (char *) dummy;
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strtok_r (delimiters, "x", &save_ptr);
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strtok_r (NULL, "x", &save_ptr);
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return 0;
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]])
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],
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[gl_cv_func_strtok_r_works=yes],
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[gl_cv_func_strtok_r_works=no],
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[case "$host_os" in
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# Guess no on glibc systems.
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*-gnu* | gnu*) gl_cv_func_strtok_r_works="guessing no" ;;
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# Guess yes on native Windows.
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mingw*) gl_cv_func_strtok_r_works="guessing yes" ;;
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*) gl_cv_func_strtok_r_works="guessing yes" ;;
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esac
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])
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])
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case "$gl_cv_func_strtok_r_works" in
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*no)
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dnl We could set REPLACE_STRTOK_R=1 here, but it's only the macro
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dnl version in <bits/string2.h> which is wrong. The code compiled
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dnl into libc is fine.
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UNDEFINE_STRTOK_R=1
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;;
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esac
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else
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HAVE_STRTOK_R=0
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fi
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AC_CHECK_DECLS_ONCE([strtok_r])
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if test $ac_cv_have_decl_strtok_r = no; then
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HAVE_DECL_STRTOK_R=0
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fi
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])
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# Prerequisites of lib/strtok_r.c.
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AC_DEFUN([gl_PREREQ_STRTOK_R], [
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:
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])
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