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71 lines
2.2 KiB
Plaintext
71 lines
2.2 KiB
Plaintext
#serial 8
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dnl Initially derived from code in GNU grep.
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dnl Mostly written by Jim Meyering.
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dnl Usage: jm_INCLUDED_REGEX([lib/regex.c])
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dnl
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AC_DEFUN(jm_INCLUDED_REGEX,
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[
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dnl Even packages that don't use regex.c can use this macro.
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dnl Of course, for them it doesn't do anything.
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# Assume we'll default to using the included regex.c.
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ac_use_included_regex=yes
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# However, if the system regex support is good enough that it passes the
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# the following run test, then default to *not* using the included regex.c.
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# If cross compiling, assume the test would fail and use the included
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# regex.c. The first failing regular expression is from `Spencer ere
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# test #75' in grep-2.3.
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AC_CACHE_CHECK([for working re_compile_pattern],
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jm_cv_func_working_re_compile_pattern,
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AC_TRY_RUN(
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[#include <stdio.h>
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#include <regex.h>
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int
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main ()
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{
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static struct re_pattern_buffer regex;
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const char *s;
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re_set_syntax (RE_SYNTAX_POSIX_EGREP);
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/* Add this third left square bracket, [, to balance the
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three right ones below. Otherwise autoconf-2.14 chokes. */
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s = re_compile_pattern ("a[[:]:]]b\n", 9, ®ex);
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/* This should fail with _Invalid character class name_ error. */
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if (!s)
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exit (1);
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/* This should succeed, but doesn't for e.g. glibc-2.1.3. */
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s = re_compile_pattern ("{1", 2, ®ex);
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exit (s ? 1 : 0);
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}
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],
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jm_cv_func_working_re_compile_pattern=yes,
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jm_cv_func_working_re_compile_pattern=no,
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dnl When crosscompiling, assume it's broken.
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jm_cv_func_working_re_compile_pattern=no))
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if test $jm_cv_func_working_re_compile_pattern = yes; then
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ac_use_included_regex=no
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fi
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test -n "$1" || AC_MSG_ERROR([missing argument])
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syscmd([test -f $1])
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ifelse(sysval, 0,
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[
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AC_ARG_WITH(included-regex,
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[ --without-included-regex don't compile regex; this is the default on
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systems with version 2 of the GNU C library
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(use with caution on other system)],
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jm_with_regex=$withval,
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jm_with_regex=$ac_use_included_regex)
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if test "$jm_with_regex" = yes; then
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AC_LIBOBJ(regex)
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fi
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],
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)
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]
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)
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