-#serial 24
+#serial 28
# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
# Software Foundation, Inc.
dnl Initially derived from code in GNU grep.
dnl Mostly written by Jim Meyering.
+AC_PREREQ([2.50])
+
AC_DEFUN([gl_REGEX],
[
- gl_INCLUDED_REGEX([lib/regex.c])
-])
-
-dnl Usage: gl_INCLUDED_REGEX([lib/regex.c])
-dnl
-AC_DEFUN([gl_INCLUDED_REGEX],
- [
- AC_LIBSOURCES(
- [regcomp.c, regex.c, regex.h,
- regex_internal.c, regex_internal.h, regexec.c])
-
- dnl Even packages that don't use regex.c can use this macro.
- dnl Of course, for them it doesn't do anything.
-
- # Assume we'll default to using the included regex.c.
- ac_use_included_regex=yes
-
- # However, if the system regex support is good enough that it passes the
- # the following run test, then default to *not* using the included regex.c.
+ AC_LIBSOURCES(
+ [regcomp.c, regex.c, regex.h,
+ regex_internal.c, regex_internal.h, regexec.c])
+
+ AC_ARG_WITH([included-regex],
+ [AC_HELP_STRING([--without-included-regex],
+ [don't compile regex; this is the default on
+ systems with recent-enough versions of the GNU C
+ Library (use with caution on other systems)])])
+
+ case $with_included_regex in
+ yes|no) ac_use_included_regex=$with_included_regex
+ ;;
+ '')
+ # If the system regex support is good enough that it passes the the
+ # following run test, then default to *not* using the included regex.c.
# If cross compiling, assume the test would fail and use the included
# regex.c. The first failing regular expression is from `Spencer ere
# test #75' in grep-2.3.
AC_CACHE_CHECK([for working re_compile_pattern],
- [gl_cv_func_working_re_compile_pattern],
+ [gl_cv_func_re_compile_pattern_broken],
[AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [AC_INCLUDES_DEFAULT
- #include <regex.h>],
- [[static struct re_pattern_buffer regex;
- const char *s;
- struct re_registers regs;
- re_set_syntax (RE_SYNTAX_POSIX_EGREP);
- memset (®ex, 0, sizeof (regex));
- s = re_compile_pattern ("a[:@:>@:]b\n", 9, ®ex);
- /* This should fail with _Invalid character class name_ error. */
- if (!s)
- exit (1);
-
- /* This should succeed, but does not for e.g. glibc-2.1.3. */
- memset (®ex, 0, sizeof (regex));
- s = re_compile_pattern ("{1", 2, ®ex);
-
- if (s)
- exit (1);
-
- /* The following example is derived from a problem report
- against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
- memset (®ex, 0, sizeof (regex));
- s = re_compile_pattern ("[an\371]*n", 7, ®ex);
- if (s)
- exit (1);
-
- /* This should match, but does not for e.g. glibc-2.2.1. */
- if (re_match (®ex, "an", 2, 0, ®s) != 2)
- exit (1);
-
- memset (®ex, 0, sizeof (regex));
- s = re_compile_pattern ("x", 1, ®ex);
- if (s)
- exit (1);
-
- /* The version of regex.c in e.g. GNU libc-2.2.93 did not
- work with a negative RANGE argument. */
- if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
- exit (1);
-
- /* The version of regex.c in older versions of gnulib
- * ignored RE_ICASE. Detect that problem too. */
- memset (®ex, 0, sizeof (regex));
- re_set_syntax(RE_SYNTAX_EMACS|RE_ICASE);
- s = re_compile_pattern ("x", 1, ®ex);
- if (s)
- exit (1);
-
- if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
- exit (1);
-
- /* REG_STARTEND was added to glibc on 2004-01-15.
- Reject older versions. */
- if (! REG_STARTEND)
- exit (1);
-
- exit (0);]])],
- [gl_cv_func_working_re_compile_pattern=yes],
- [gl_cv_func_working_re_compile_pattern=no],
- dnl When crosscompiling, assume it is broken.
- [gl_cv_func_working_re_compile_pattern=no])])
- if test $gl_cv_func_working_re_compile_pattern = yes; then
- ac_use_included_regex=no
- fi
-
- test -n "$1" || AC_MSG_ERROR([missing argument])
- m4_syscmd([test -f '$1'])
- ifelse(m4_sysval, 0,
- [
- AC_ARG_WITH([included-regex],
- [ --without-included-regex don't compile regex; this is the default on
- systems with recent-enough versions of the GNU C
- Library (use with caution on other systems)],
- [gl_with_regex=$withval],
- [gl_with_regex=$ac_use_included_regex])
- if test "X$gl_with_regex" = Xyes; then
- AC_LIBOBJ([regex])
- gl_PREREQ_REGEX
- fi
- ],
- )
- ]
-)
+ [AC_LANG_PROGRAM(
+ [AC_INCLUDES_DEFAULT
+ #include <regex.h>],
+ [[static struct re_pattern_buffer regex;
+ const char *s;
+ struct re_registers regs;
+ /* Use the POSIX-compliant spelling with leading REG_,
+ rather than the traditional GNU spelling with leading RE_,
+ so that we reject older libc implementations. */
+ re_set_syntax (REG_SYNTAX_POSIX_EGREP);
+ memset (®ex, 0, sizeof (regex));
+ s = re_compile_pattern ("a[:@:>@:]b\n", 9, ®ex);
+ /* This should fail with _Invalid character class name_ error. */
+ if (!s)
+ exit (1);
+
+ /* This should succeed, but does not for e.g. glibc-2.1.3. */
+ memset (®ex, 0, sizeof (regex));
+ s = re_compile_pattern ("{1", 2, ®ex);
+
+ if (s)
+ exit (1);
+
+ /* The following example is derived from a problem report
+ against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
+ memset (®ex, 0, sizeof (regex));
+ s = re_compile_pattern ("[an\371]*n", 7, ®ex);
+ if (s)
+ exit (1);
+
+ /* This should match, but does not for e.g. glibc-2.2.1. */
+ if (re_match (®ex, "an", 2, 0, ®s) != 2)
+ exit (1);
+
+ memset (®ex, 0, sizeof (regex));
+ s = re_compile_pattern ("x", 1, ®ex);
+ if (s)
+ exit (1);
+
+ /* The version of regex.c in e.g. GNU libc-2.2.93 did not
+ work with a negative RANGE argument. */
+ if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
+ exit (1);
+
+ /* The version of regex.c in older versions of gnulib
+ ignored REG_IGNORE_CASE (which was then called RE_ICASE).
+ Detect that problem too. */
+ memset (®ex, 0, sizeof (regex));
+ re_set_syntax (REG_SYNTAX_EMACS | REG_IGNORE_CASE);
+ s = re_compile_pattern ("x", 1, ®ex);
+ if (s)
+ exit (1);
+
+ if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
+ exit (1);
+
+ /* REG_STARTEND was added to glibc on 2004-01-15.
+ Reject older versions. */
+ if (! REG_STARTEND)
+ exit (1);
+
+ exit (0);]])],
+ [gl_cv_func_re_compile_pattern_broken=no],
+ [gl_cv_func_re_compile_pattern_broken=yes],
+ dnl When crosscompiling, assume it is broken.
+ [gl_cv_func_re_compile_pattern_broken=yes])])
+ ac_use_included_regex=$gl_cv_func_re_compile_pattern_broken
+ ;;
+ *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
+ ;;
+ esac
+
+ if test $ac_use_included_regex = yes; then
+ AC_LIBOBJ([regex])
+ gl_PREREQ_REGEX
+ fi
+])
# Prerequisites of lib/regex.c and lib/regex_internal.c.
AC_DEFUN([gl_PREREQ_REGEX],
[
+ AC_REQUIRE([AC_GNU_SOURCE])
AC_REQUIRE([gl_C_RESTRICT])
AC_REQUIRE([AM_LANGINFO_CODESET])
AC_CHECK_HEADERS_ONCE([locale.h wchar.h wctype.h])