Update to pcre2 10.21

Point build tools at 10.21

1 files changed, 921 insertions, 0 deletions

diff --git a/pcre2-10.21/configure.ac b/pcre2-10.21/configure.ac
new file mode 100644
index 00000000..99ad8a9f
--- /dev/null
+++ b/pcre2-10.21/configure.ac
@@ -0,0 +1,921 @@
+dnl Process this file with autoconf to produce a configure script.
+
+dnl NOTE FOR MAINTAINERS: Do not use minor version numbers 08 or 09 because
+dnl the leading zeros may cause them to be treated as invalid octal constants
+dnl if a PCRE2 user writes code that uses PCRE2_MINOR as a number. There is now
+dnl a check further down that throws an error if 08 or 09 are used.
+
+dnl The PCRE2_PRERELEASE feature is for identifying release candidates. It might
+dnl be defined as -RC2, for example. For real releases, it should be empty.
+
+m4_define(pcre2_major, [10])
+m4_define(pcre2_minor, [21])
+m4_define(pcre2_prerelease, [])
+m4_define(pcre2_date, [2016-01-12])
+
+# NOTE: The CMakeLists.txt file searches for the above variables in the first
+# 50 lines of this file. Please update that if the variables above are moved.
+
+# Libtool shared library interface versions (current:revision:age)
+m4_define(libpcre2_8_version,     [3:0:3])
+m4_define(libpcre2_16_version,    [3:0:3])
+m4_define(libpcre2_32_version,    [3:0:3])
+m4_define(libpcre2_posix_version, [0:1:0])
+
+AC_PREREQ(2.57)
+AC_INIT(PCRE2, pcre2_major.pcre2_minor[]pcre2_prerelease, , pcre2)
+AC_CONFIG_SRCDIR([src/pcre2.h.in])
+AM_INIT_AUTOMAKE([dist-bzip2 dist-zip])
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+AC_CONFIG_HEADERS(src/config.h)
+
+# This is a new thing required to stop a warning from automake 1.12
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
+
+# This was added at the suggestion of libtoolize (03-Jan-10)
+AC_CONFIG_MACRO_DIR([m4])
+
+# The default CFLAGS in Autoconf are "-g -O2" for gcc and just "-g" for any
+# other compiler. There doesn't seem to be a standard way of getting rid of the
+# -g (which I don't think is needed for a production library). This fudge seems
+# to achieve the necessary. First, we remember the externally set values of
+# CFLAGS. Then call the AC_PROG_CC macro to find the compiler - if CFLAGS is
+# not set, it will be set to Autoconf's defaults. Afterwards, if the original
+# values were not set, remove the -g from the Autoconf defaults.
+
+remember_set_CFLAGS="$CFLAGS"
+
+AC_PROG_CC
+AM_PROG_CC_C_O
+
+if test "x$remember_set_CFLAGS" = "x"
+then
+  if test "$CFLAGS" = "-g -O2"
+  then
+    CFLAGS="-O2"
+  elif test "$CFLAGS" = "-g"
+  then
+    CFLAGS=""
+  fi
+fi
+
+# Check for a 64-bit integer type
+AC_TYPE_INT64_T
+
+AC_PROG_INSTALL
+AC_LIBTOOL_WIN32_DLL
+LT_INIT
+AC_PROG_LN_S
+
+# Check for GCC visibility feature
+
+PCRE2_VISIBILITY
+
+# Versioning
+
+PCRE2_MAJOR="pcre2_major"
+PCRE2_MINOR="pcre2_minor"
+PCRE2_PRERELEASE="pcre2_prerelease"
+PCRE2_DATE="pcre2_date"
+
+if test "$PCRE2_MINOR" = "08" -o "$PCRE2_MINOR" = "09"
+then
+  echo "***"
+  echo "*** Minor version number $PCRE2_MINOR must not be used. ***"
+  echo "*** Use only 00 to 07 or 10 onwards, to avoid octal issues. ***"
+  echo "***"
+  exit 1
+fi
+
+AC_SUBST(PCRE2_MAJOR)
+AC_SUBST(PCRE2_MINOR)
+AC_SUBST(PCRE2_PRERELEASE)
+AC_SUBST(PCRE2_DATE)
+
+# Set a more sensible default value for $(htmldir).
+if test "x$htmldir" = 'x${docdir}'
+then
+  htmldir='${docdir}/html'
+fi
+
+# Force an error for PCRE1 size options
+AC_ARG_ENABLE(pcre8,,,enable_pcre8=no)
+AC_ARG_ENABLE(pcre16,,,enable_pcre16=no)
+AC_ARG_ENABLE(pcre32,,,enable_pcre32=no)
+
+if test "$enable_pcre8$enable_pcre16$enable_pcre32" != "nonono"
+then
+  echo "** ERROR: Use --[[en|dis]]able-pcre2-[[8|16|32]], not --[[en|dis]]able-pcre[[8|16|32]]"
+  exit 1
+fi
+
+# Handle --disable-pcre2-8 (enabled by default)
+AC_ARG_ENABLE(pcre2-8,
+              AS_HELP_STRING([--disable-pcre2-8],
+                             [disable 8 bit character support]),
+              , enable_pcre2_8=unset)
+AC_SUBST(enable_pcre2_8)
+
+# Handle --enable-pcre2-16 (disabled by default)
+AC_ARG_ENABLE(pcre2-16,
+              AS_HELP_STRING([--enable-pcre2-16],
+                             [enable 16 bit character support]),
+              , enable_pcre2_16=unset)
+AC_SUBST(enable_pcre2_16)
+
+# Handle --enable-pcre2-32 (disabled by default)
+AC_ARG_ENABLE(pcre2-32,
+              AS_HELP_STRING([--enable-pcre2-32],
+                             [enable 32 bit character support]),
+              , enable_pcre2_32=unset)
+AC_SUBST(enable_pcre2_32)
+
+# Handle --dnable-debug (disabled by default)
+AC_ARG_ENABLE(debug,
+              AS_HELP_STRING([--enable-debug],
+                             [enable debugging code]),
+              , enable_debug=no)
+
+# Handle --enable-jit (disabled by default)
+AC_ARG_ENABLE(jit,
+              AS_HELP_STRING([--enable-jit],
+                             [enable Just-In-Time compiling support]),
+              , enable_jit=no)
+
+# Handle --disable-pcre2grep-jit (enabled by default)
+AC_ARG_ENABLE(pcre2grep-jit,
+              AS_HELP_STRING([--disable-pcre2grep-jit],
+                             [disable JIT support in pcre2grep]),
+              , enable_pcre2grep_jit=yes)
+
+# Handle --enable-rebuild-chartables
+AC_ARG_ENABLE(rebuild-chartables,
+              AS_HELP_STRING([--enable-rebuild-chartables],
+                             [rebuild character tables in current locale]),
+              , enable_rebuild_chartables=no)
+
+# Handle --disable-unicode (enabled by default)
+AC_ARG_ENABLE(unicode,
+              AS_HELP_STRING([--disable-unicode],
+                             [disable Unicode support]),
+              , enable_unicode=unset)
+
+# Handle newline options
+ac_pcre2_newline=lf
+AC_ARG_ENABLE(newline-is-cr,
+              AS_HELP_STRING([--enable-newline-is-cr],
+                             [use CR as newline character]),
+              ac_pcre2_newline=cr)
+AC_ARG_ENABLE(newline-is-lf,
+              AS_HELP_STRING([--enable-newline-is-lf],
+                             [use LF as newline character (default)]),
+              ac_pcre2_newline=lf)
+AC_ARG_ENABLE(newline-is-crlf,
+              AS_HELP_STRING([--enable-newline-is-crlf],
+                             [use CRLF as newline sequence]),
+              ac_pcre2_newline=crlf)
+AC_ARG_ENABLE(newline-is-anycrlf,
+              AS_HELP_STRING([--enable-newline-is-anycrlf],
+                             [use CR, LF, or CRLF as newline sequence]),
+              ac_pcre2_newline=anycrlf)
+AC_ARG_ENABLE(newline-is-any,
+              AS_HELP_STRING([--enable-newline-is-any],
+                             [use any valid Unicode newline sequence]),
+              ac_pcre2_newline=any)
+enable_newline="$ac_pcre2_newline"
+
+# Handle --enable-bsr-anycrlf
+AC_ARG_ENABLE(bsr-anycrlf,
+              AS_HELP_STRING([--enable-bsr-anycrlf],
+                             [\R matches only CR, LF, CRLF by default]),
+              , enable_bsr_anycrlf=no)
+
+# Handle --enable-never-backslash-C
+AC_ARG_ENABLE(never-backslash-C,
+              AS_HELP_STRING([--enable-never-backslash-C],
+                             [use of \C causes an error]),
+              , enable_never_backslash_C=no)
+
+# Handle --enable-ebcdic
+AC_ARG_ENABLE(ebcdic,
+              AS_HELP_STRING([--enable-ebcdic],
+                             [assume EBCDIC coding rather than ASCII; incompatible with --enable-utf; use only in (uncommon) EBCDIC environments; it implies --enable-rebuild-chartables]),
+              , enable_ebcdic=no)
+
+# Handle --enable-ebcdic-nl25
+AC_ARG_ENABLE(ebcdic-nl25,
+              AS_HELP_STRING([--enable-ebcdic-nl25],
+                             [set EBCDIC code for NL to 0x25 instead of 0x15; it implies --enable-ebcdic]),
+              , enable_ebcdic_nl25=no)
+
+# Handle --disable-stack-for-recursion
+AC_ARG_ENABLE(stack-for-recursion,
+              AS_HELP_STRING([--disable-stack-for-recursion],
+                             [don't use stack recursion when matching]),
+              , enable_stack_for_recursion=yes)
+
+# Handle --enable-pcre2grep-libz
+AC_ARG_ENABLE(pcre2grep-libz,
+              AS_HELP_STRING([--enable-pcre2grep-libz],
+                             [link pcre2grep with libz to handle .gz files]),
+              , enable_pcre2grep_libz=no)
+
+# Handle --enable-pcre2grep-libbz2
+AC_ARG_ENABLE(pcre2grep-libbz2,
+              AS_HELP_STRING([--enable-pcre2grep-libbz2],
+                             [link pcre2grep with libbz2 to handle .bz2 files]),
+              , enable_pcre2grep_libbz2=no)
+
+# Handle --with-pcre2grep-bufsize=N
+AC_ARG_WITH(pcre2grep-bufsize,
+              AS_HELP_STRING([--with-pcre2grep-bufsize=N],
+                             [pcre2grep buffer size (default=20480, minimum=8192)]),
+              , with_pcre2grep_bufsize=20480)
+
+# Handle --enable-pcre2test-libedit
+AC_ARG_ENABLE(pcre2test-libedit,
+              AS_HELP_STRING([--enable-pcre2test-libedit],
+                             [link pcre2test with libedit]),
+              , enable_pcre2test_libedit=no)
+
+# Handle --enable-pcre2test-libreadline
+AC_ARG_ENABLE(pcre2test-libreadline,
+              AS_HELP_STRING([--enable-pcre2test-libreadline],
+                             [link pcre2test with libreadline]),
+              , enable_pcre2test_libreadline=no)
+
+# Handle --with-link-size=N
+AC_ARG_WITH(link-size,
+            AS_HELP_STRING([--with-link-size=N],
+                           [internal link size (2, 3, or 4 allowed; default=2)]),
+            , with_link_size=2)
+
+# Handle --with-parens-nest-limit=N
+AC_ARG_WITH(parens-nest-limit,
+            AS_HELP_STRING([--with-parens-nest-limit=N],
+                           [nested parentheses limit (default=250)]),
+            , with_parens_nest_limit=250)
+
+# Handle --with-match-limit=N
+AC_ARG_WITH(match-limit,
+            AS_HELP_STRING([--with-match-limit=N],
+                           [default limit on internal looping (default=10000000)]),
+            , with_match_limit=10000000)
+
+# Handle --with-match-limit_recursion=N
+#
+# Note: In config.h, the default is to define MATCH_LIMIT_RECURSION
+# symbolically as MATCH_LIMIT, which in turn is defined to be some numeric
+# value (e.g. 10000000). MATCH_LIMIT_RECURSION can otherwise be set to some
+# different numeric value (or even the same numeric value as MATCH_LIMIT,
+# though no longer defined in terms of the latter).
+#
+AC_ARG_WITH(match-limit-recursion,
+            AS_HELP_STRING([--with-match-limit-recursion=N],
+                           [default limit on internal recursion (default=MATCH_LIMIT)]),
+            , with_match_limit_recursion=MATCH_LIMIT)
+
+# Handle --enable-valgrind
+AC_ARG_ENABLE(valgrind,
+              AS_HELP_STRING([--enable-valgrind],
+                             [valgrind support]),
+              , enable_valgrind=no)
+
+# Enable code coverage reports using gcov
+AC_ARG_ENABLE(coverage,
+              AS_HELP_STRING([--enable-coverage],
+                             [enable code coverage reports using gcov]),
+              , enable_coverage=no)
+
+# Set the default value for pcre2-8
+if test "x$enable_pcre2_8" = "xunset"
+then
+  enable_pcre2_8=yes
+fi
+
+# Set the default value for pcre2-16
+if test "x$enable_pcre2_16" = "xunset"
+then
+  enable_pcre2_16=no
+fi
+
+# Set the default value for pcre2-32
+if test "x$enable_pcre2_32" = "xunset"
+then
+  enable_pcre2_32=no
+fi
+
+# Make sure at least one library is selected
+if test "x$enable_pcre2_8$enable_pcre2_16$enable_pcre2_32" = "xnonono"
+then
+  AC_MSG_ERROR([At least one of the 8, 16 or 32 bit libraries must be enabled])
+fi
+
+# Unicode is enabled by default.
+if test "x$enable_unicode" = "xunset"
+then
+  enable_unicode=yes
+fi
+
+# Convert the newline identifier into the appropriate integer value. These must
+# agree with the PCRE2_NEWLINE_xxx values in pcre2.h.
+
+case "$enable_newline" in
+  cr)      ac_pcre2_newline_value=1 ;;
+  lf)      ac_pcre2_newline_value=2 ;;
+  crlf)    ac_pcre2_newline_value=3 ;;
+  any)     ac_pcre2_newline_value=4 ;;
+  anycrlf) ac_pcre2_newline_value=5 ;;
+  *)
+  AC_MSG_ERROR([invalid argument \"$enable_newline\" to --enable-newline option])
+  ;;
+esac
+
+# --enable-ebcdic-nl25 implies --enable-ebcdic
+if test "x$enable_ebcdic_nl25" = "xyes"; then
+  enable_ebcdic=yes
+fi
+
+# Make sure that if enable_ebcdic is set, rebuild_chartables is also enabled.
+# Also check that UTF support is not requested, because PCRE2 cannot handle
+# EBCDIC and UTF in the same build. To do so it would need to use different
+# character constants depending on the mode. Also, EBCDIC cannot be used with
+# 16-bit and 32-bit libraries.
+#
+if test "x$enable_ebcdic" = "xyes"; then
+  enable_rebuild_chartables=yes
+  if test "x$enable_unicode" = "xyes"; then
+    AC_MSG_ERROR([support for EBCDIC and Unicode cannot be enabled at the same time])
+  fi
+  if test "x$enable_pcre2_16" = "xyes" -o "x$enable_pcre2_32" = "xyes"; then
+    AC_MSG_ERROR([EBCDIC support is available only for the 8-bit library])
+  fi
+fi
+
+# Check argument to --with-link-size
+case "$with_link_size" in
+  2|3|4) ;;
+  *)
+  AC_MSG_ERROR([invalid argument \"$with_link_size\" to --with-link-size option])
+  ;;
+esac
+
+AH_TOP([
+/* PCRE2 is written in Standard C, but there are a few non-standard things it
+can cope with, allowing it to run on SunOS4 and other "close to standard"
+systems.
+
+In environments that support the GNU autotools, config.h.in is converted into
+config.h by the "configure" script. In environments that use CMake,
+config-cmake.in is converted into config.h. If you are going to build PCRE2 "by
+hand" without using "configure" or CMake, you should copy the distributed
+config.h.generic to config.h, and edit the macro definitions to be the way you
+need them. You must then add -DHAVE_CONFIG_H to all of your compile commands,
+so that config.h is included at the start of every source.
+
+Alternatively, you can avoid editing by using -D on the compiler command line
+to set the macro values. In this case, you do not have to set -DHAVE_CONFIG_H,
+but if you do, default values will be taken from config.h for non-boolean
+macros that are not defined on the command line.
+
+Boolean macros such as HAVE_STDLIB_H and SUPPORT_PCRE2_8 should either be defined
+(conventionally to 1) for TRUE, and not defined at all for FALSE. All such
+macros are listed as a commented #undef in config.h.generic. Macros such as
+MATCH_LIMIT, whose actual value is relevant, have defaults defined, but are
+surrounded by #ifndef/#endif lines so that the value can be overridden by -D.
+
+PCRE2 uses memmove() if HAVE_MEMMOVE is defined; otherwise it uses bcopy() if
+HAVE_BCOPY is defined. If your system has neither bcopy() nor memmove(), make
+sure both macros are undefined; an emulation function will then be used. */])
+
+# Checks for header files.
+AC_HEADER_STDC
+AC_CHECK_HEADERS(limits.h sys/types.h sys/stat.h dirent.h)
+AC_CHECK_HEADERS([windows.h], [HAVE_WINDOWS_H=1])
+
+# Conditional compilation
+AM_CONDITIONAL(WITH_PCRE2_8, test "x$enable_pcre2_8" = "xyes")
+AM_CONDITIONAL(WITH_PCRE2_16, test "x$enable_pcre2_16" = "xyes")
+AM_CONDITIONAL(WITH_PCRE2_32, test "x$enable_pcre2_32" = "xyes")
+AM_CONDITIONAL(WITH_DEBUG, test "x$enable_debug" = "xyes")
+AM_CONDITIONAL(WITH_REBUILD_CHARTABLES, test "x$enable_rebuild_chartables" = "xyes")
+AM_CONDITIONAL(WITH_JIT, test "x$enable_jit" = "xyes")
+AM_CONDITIONAL(WITH_UNICODE, test "x$enable_unicode" = "xyes")
+AM_CONDITIONAL(WITH_VALGRIND, test "x$enable_valgrind" = "xyes")
+
+# Checks for typedefs, structures, and compiler characteristics.
+
+AC_C_CONST
+AC_TYPE_SIZE_T
+
+# Checks for library functions.
+
+AC_CHECK_FUNCS(bcopy memmove strerror)
+
+# Check for the availability of libz (aka zlib)
+
+AC_CHECK_HEADERS([zlib.h], [HAVE_ZLIB_H=1])
+AC_CHECK_LIB([z], [gzopen], [HAVE_LIBZ=1])
+
+# Check for the availability of libbz2. Originally we just used AC_CHECK_LIB,
+# as for libz. However, this had the following problem, diagnosed and fixed by
+# a user:
+#
+#   - libbz2 uses the Pascal calling convention (WINAPI) for the functions
+#     under Win32.
+#   - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
+#     therefore missing the function definition.
+#   - The compiler thus generates a "C" signature for the test function.
+#   - The linker fails to find the "C" function.
+#   - PCRE2 fails to configure if asked to do so against libbz2.
+#
+# Solution:
+#
+#   - Replace the AC_CHECK_LIB test with a custom test.
+
+AC_CHECK_HEADERS([bzlib.h], [HAVE_BZLIB_H=1])
+# Original test
+# AC_CHECK_LIB([bz2], [BZ2_bzopen], [HAVE_LIBBZ2=1])
+#
+# Custom test follows
+
+AC_MSG_CHECKING([for libbz2])
+OLD_LIBS="$LIBS"
+LIBS="$LIBS -lbz2"
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#ifdef HAVE_BZLIB_H
+#include <bzlib.h>
+#endif]],
+[[return (int)BZ2_bzopen("conftest", "rb");]])],
+[AC_MSG_RESULT([yes]);HAVE_LIBBZ2=1; break;],
+AC_MSG_RESULT([no]))
+LIBS="$OLD_LIBS"
+
+# Check for the availabiity of libreadline
+
+if test "$enable_pcre2test_libreadline" = "yes"; then
+ AC_CHECK_HEADERS([readline/readline.h], [HAVE_READLINE_H=1])
+ AC_CHECK_HEADERS([readline/history.h], [HAVE_HISTORY_H=1])
+ AC_CHECK_LIB([readline], [readline], [LIBREADLINE="-lreadline"],
+   [unset ac_cv_lib_readline_readline;
+    AC_CHECK_LIB([readline], [readline], [LIBREADLINE="-ltinfo"],
+     [unset ac_cv_lib_readline_readline;
+      AC_CHECK_LIB([readline], [readline], [LIBREADLINE="-lcurses"],
+       [unset ac_cv_lib_readline_readline;
+        AC_CHECK_LIB([readline], [readline], [LIBREADLINE="-lncurses"],
+         [unset ac_cv_lib_readline_readline;
+	  AC_CHECK_LIB([readline], [readline], [LIBREADLINE="-lncursesw"],
+           [unset ac_cv_lib_readline_readline;
+	    AC_CHECK_LIB([readline], [readline], [LIBREADLINE="-ltermcap"],
+             [LIBREADLINE=""],
+             [-ltermcap])],
+           [-lncursesw])],
+         [-lncurses])],
+       [-lcurses])],
+     [-ltinfo])])
+ AC_SUBST(LIBREADLINE)
+ if test -n "$LIBREADLINE"; then
+   if test "$LIBREADLINE" != "-lreadline"; then
+     echo "-lreadline needs $LIBREADLINE"
+     LIBREADLINE="-lreadline $LIBREADLINE"
+   fi
+ fi
+fi
+
+
+# Check for the availability of libedit. Different distributions put its
+# headers in different places. Try to cover the most common ones.
+
+if test "$enable_pcre2test_libedit" = "yes"; then
+  AC_CHECK_HEADERS([editline/readline.h], [HAVE_EDITLINE_READLINE_H=1],
+    [AC_CHECK_HEADERS([edit/readline/readline.h], [HAVE_READLINE_READLINE_H=1],
+      [AC_CHECK_HEADERS([readline/readline.h], [HAVE_READLINE_READLINE_H=1])])])
+  AC_CHECK_LIB([edit], [readline], [LIBEDIT="-ledit"])
+fi
+
+# This facilitates -ansi builds under Linux
+dnl AC_DEFINE([_GNU_SOURCE], [], [Enable GNU extensions in glibc])
+
+PCRE2_STATIC_CFLAG=""
+if test "x$enable_shared" = "xno" ; then
+  AC_DEFINE([PCRE2_STATIC], [1], [
+    Define to any value if linking statically (TODO: make nice with Libtool)])
+  PCRE2_STATIC_CFLAG="-DPCRE2_STATIC"
+fi
+AC_SUBST(PCRE2_STATIC_CFLAG)
+
+# Here is where PCRE2-specific defines are handled
+
+if test "$enable_pcre2_8" = "yes"; then
+  AC_DEFINE([SUPPORT_PCRE2_8], [], [
+    Define to any value to enable the 8 bit PCRE2 library.])
+fi
+
+if test "$enable_pcre2_16" = "yes"; then
+  AC_DEFINE([SUPPORT_PCRE2_16], [], [
+    Define to any value to enable the 16 bit PCRE2 library.])
+fi
+
+if test "$enable_pcre2_32" = "yes"; then
+  AC_DEFINE([SUPPORT_PCRE2_32], [], [
+    Define to any value to enable the 32 bit PCRE2 library.])
+fi
+
+if test "$enable_debug" = "yes"; then
+  AC_DEFINE([PCRE2_DEBUG], [], [
+    Define to any value to include debugging code.])
+fi
+
+# Unless running under Windows, JIT support requires pthreads.
+
+if test "$enable_jit" = "yes"; then
+  if test "$HAVE_WINDOWS_H" != "1"; then
+    AX_PTHREAD([], [AC_MSG_ERROR([JIT support requires pthreads])])
+    CC="$PTHREAD_CC"
+    CFLAGS="$PTHREAD_CFLAGS $CFLAGS"
+    LIBS="$PTHREAD_LIBS $LIBS"
+  fi
+  AC_DEFINE([SUPPORT_JIT], [], [
+    Define to any value to enable support for Just-In-Time compiling.])
+else
+  enable_pcre2grep_jit="no"
+fi
+
+if test "$enable_pcre2grep_jit" = "yes"; then
+  AC_DEFINE([SUPPORT_PCRE2GREP_JIT], [], [
+    Define to any value to enable JIT support in pcre2grep.])
+fi
+
+if test "$enable_unicode" = "yes"; then
+  AC_DEFINE([SUPPORT_UNICODE], [], [
+    Define to any value to enable support for Unicode and UTF encoding.
+    This will work even in an EBCDIC environment, but it is incompatible
+    with the EBCDIC macro. That is, PCRE2 can support *either* EBCDIC
+    code *or* ASCII/Unicode, but not both at once.])
+fi
+
+if test "$enable_stack_for_recursion" = "no"; then
+  AC_DEFINE([HEAP_MATCH_RECURSE], [], [
+    PCRE2 uses recursive function calls to handle backtracking while
+    matching. This can sometimes be a problem on systems that have
+    stacks of limited size. Define HEAP_MATCH_RECURSE to any value to get a
+    version that doesn't use recursion in the match() function; instead
+    it creates its own stack by steam using memory from the heap. For more
+    detail, see the comments and other stuff just above the match() function.])
+fi
+
+if test "$enable_pcre2grep_libz" = "yes"; then
+  AC_DEFINE([SUPPORT_LIBZ], [], [
+    Define to any value to allow pcre2grep to be linked with libz, so that it is
+    able to handle .gz files.])
+fi
+
+if test "$enable_pcre2grep_libbz2" = "yes"; then
+  AC_DEFINE([SUPPORT_LIBBZ2], [], [
+    Define to any value to allow pcre2grep to be linked with libbz2, so that it
+    is able to handle .bz2 files.])
+fi
+
+if test $with_pcre2grep_bufsize -lt 8192 ; then
+  AC_MSG_WARN([$with_pcre2grep_bufsize is too small for --with-pcre2grep-bufsize; using 8192])
+  with_pcre2grep_bufsize="8192"
+else
+  if test $? -gt 1 ; then
+  AC_MSG_ERROR([Bad value for  --with-pcre2grep-bufsize])
+  fi
+fi
+
+AC_DEFINE_UNQUOTED([PCRE2GREP_BUFSIZE], [$with_pcre2grep_bufsize], [
+  The value of PCRE2GREP_BUFSIZE determines the size of buffer used by pcre2grep
+  to hold parts of the file it is searching. This is also the minimum value.
+  The actual amount of memory used by pcre2grep is three times this number,
+  because it allows for the buffering of "before" and "after" lines.])
+
+if test "$enable_pcre2test_libedit" = "yes"; then
+  AC_DEFINE([SUPPORT_LIBEDIT], [], [
+    Define to any value to allow pcre2test to be linked with libedit.])
+  LIBREADLINE="$LIBEDIT"
+elif test "$enable_pcre2test_libreadline" = "yes"; then
+  AC_DEFINE([SUPPORT_LIBREADLINE], [], [
+    Define to any value to allow pcre2test to be linked with libreadline.])
+fi
+
+AC_DEFINE_UNQUOTED([NEWLINE_DEFAULT], [$ac_pcre2_newline_value], [
+  The value of NEWLINE_DEFAULT determines the default newline character
+  sequence. PCRE2 client programs can override this by selecting other values
+  at run time. The valid values are 1 (CR), 2 (LF), 3 (CRLF), 4 (ANY),
+  and 5 (ANYCRLF).])
+
+if test "$enable_bsr_anycrlf" = "yes"; then
+  AC_DEFINE([BSR_ANYCRLF], [], [
+    By default, the \R escape sequence matches any Unicode line ending
+    character or sequence of characters. If BSR_ANYCRLF is defined (to any
+    value), this is changed so that backslash-R matches only CR, LF, or CRLF.
+    The build-time default can be overridden by the user of PCRE2 at runtime.])
+fi
+
+if test "$enable_never_backslash_C" = "yes"; then
+  AC_DEFINE([NEVER_BACKSLASH_C], [], [
+    Defining NEVER_BACKSLASH_C locks out the use of \C in all patterns.])
+fi
+
+AC_DEFINE_UNQUOTED([LINK_SIZE], [$with_link_size], [
+  The value of LINK_SIZE determines the number of bytes used to store
+  links as offsets within the compiled regex. The default is 2, which
+  allows for compiled patterns up to 64K long. This covers the vast
+  majority of cases. However, PCRE2 can also be compiled to use 3 or 4
+  bytes instead. This allows for longer patterns in extreme cases.])
+
+AC_DEFINE_UNQUOTED([PARENS_NEST_LIMIT], [$with_parens_nest_limit], [
+  The value of PARENS_NEST_LIMIT specifies the maximum depth of nested
+  parentheses (of any kind) in a pattern. This limits the amount of system
+  stack that is used while compiling a pattern.])
+
+AC_DEFINE_UNQUOTED([MATCH_LIMIT], [$with_match_limit], [
+  The value of MATCH_LIMIT determines the default number of times the
+  internal match() function can be called during a single execution of
+  pcre2_match(). There is a runtime interface for setting a different
+  limit. The limit exists in order to catch runaway regular
+  expressions that take for ever to determine that they do not match.
+  The default is set very large so that it does not accidentally catch
+  legitimate cases.])
+
+AC_DEFINE_UNQUOTED([MATCH_LIMIT_RECURSION], [$with_match_limit_recursion], [
+  The above limit applies to all calls of match(), whether or not they
+  increase the recursion depth. In some environments it is desirable
+  to limit the depth of recursive calls of match() more strictly, in
+  order to restrict the maximum amount of stack (or heap, if
+  HEAP_MATCH_RECURSE is defined) that is used. The value of
+  MATCH_LIMIT_RECURSION applies only to recursive calls of match(). To
+  have any useful effect, it must be less than the value of
+  MATCH_LIMIT. The default is to use the same value as MATCH_LIMIT.
+  There is a runtime method for setting a different limit.])
+
+AC_DEFINE([MAX_NAME_SIZE], [32], [
+  This limit is parameterized just in case anybody ever wants to
+  change it. Care must be taken if it is increased, because it guards
+  against integer overflow caused by enormously large patterns.])
+
+AC_DEFINE([MAX_NAME_COUNT], [10000], [
+  This limit is parameterized just in case anybody ever wants to
+  change it. Care must be taken if it is increased, because it guards
+  against integer overflow caused by enormously large patterns.])
+
+AH_VERBATIM([PCRE2_EXP_DEFN], [
+/* If you are compiling for a system other than a Unix-like system or
+   Win32, and it needs some magic to be inserted before the definition
+   of a function that is exported by the library, define this macro to
+   contain the relevant magic. If you do not define this macro, a suitable
+    __declspec value is used for Windows systems; in other environments
+   "extern" is used for a C compiler and "extern C" for a C++ compiler.
+   This macro apears at the start of every exported function that is part
+   of the external API. It does not appear on functions that are "external"
+   in the C sense, but which are internal to the library. */
+#undef PCRE2_EXP_DEFN])
+
+if test "$enable_ebcdic" = "yes"; then
+  AC_DEFINE_UNQUOTED([EBCDIC], [], [
+    If you are compiling for a system that uses EBCDIC instead of ASCII
+    character codes, define this macro to any value. When EBCDIC is set, PCRE2
+    assumes that all input strings are in EBCDIC. If you do not define this
+    macro, PCRE2 will assume input strings are ASCII or UTF-8/16/32 Unicode. It
+    is not possible to build a version of PCRE2 that supports both EBCDIC and
+    UTF-8/16/32.])
+fi
+
+if test "$enable_ebcdic_nl25" = "yes"; then
+  AC_DEFINE_UNQUOTED([EBCDIC_NL25], [], [
+    In an EBCDIC environment, define this macro to any value to arrange for
+    the NL character to be 0x25 instead of the default 0x15. NL plays the role
+    that LF does in an ASCII/Unicode environment.])
+fi
+
+if test "$enable_valgrind" = "yes"; then
+  AC_DEFINE_UNQUOTED([SUPPORT_VALGRIND], [], [
+     Define to any value for valgrind support to find invalid memory reads.])
+fi
+
+# Platform specific issues
+NO_UNDEFINED=
+EXPORT_ALL_SYMBOLS=
+case $host_os in
+  cygwin* | mingw* )
+    if test X"$enable_shared" = Xyes; then
+      NO_UNDEFINED="-no-undefined"
+      EXPORT_ALL_SYMBOLS="-Wl,--export-all-symbols"
+    fi
+    ;;
+esac
+
+# The extra LDFLAGS for each particular library. The libpcre2*_version values
+# are m4 variables, assigned above.
+
+EXTRA_LIBPCRE2_8_LDFLAGS="$EXTRA_LIBPCRE2_8_LDFLAGS \
+  $NO_UNDEFINED -version-info libpcre2_8_version"
+
+EXTRA_LIBPCRE2_16_LDFLAGS="$EXTRA_LIBPCRE2_16_LDFLAGS \
+  $NO_UNDEFINED -version-info libpcre2_16_version"
+
+EXTRA_LIBPCRE2_32_LDFLAGS="$EXTRA_LIBPCRE2_32_LDFLAGS \
+  $NO_UNDEFINED -version-info libpcre2_32_version"
+
+EXTRA_LIBPCRE2_POSIX_LDFLAGS="$EXTRA_LIBPCRE2_POSIX_LDFLAGS \
+  $NO_UNDEFINED -version-info libpcre2_posix_version"
+
+AC_SUBST(EXTRA_LIBPCRE2_8_LDFLAGS)
+AC_SUBST(EXTRA_LIBPCRE2_16_LDFLAGS)
+AC_SUBST(EXTRA_LIBPCRE2_32_LDFLAGS)
+AC_SUBST(EXTRA_LIBPCRE2_POSIX_LDFLAGS)
+
+# When we run 'make distcheck', use these arguments. Turning off compiler
+# optimization makes it run faster.
+DISTCHECK_CONFIGURE_FLAGS="CFLAGS='' CXXFLAGS='' --enable-pcre2-16 --enable-pcre2-32 --enable-jit --enable-utf"
+AC_SUBST(DISTCHECK_CONFIGURE_FLAGS)
+
+# Check that, if --enable-pcre2grep-libz or --enable-pcre2grep-libbz2 is
+# specified, the relevant library is available.
+
+if test "$enable_pcre2grep_libz" = "yes"; then
+  if test "$HAVE_ZLIB_H" != "1"; then
+    echo "** Cannot --enable-pcre2grep-libz because zlib.h was not found"
+    exit 1
+  fi
+  if test "$HAVE_LIBZ" != "1"; then
+    echo "** Cannot --enable-pcre2grep-libz because libz was not found"
+    exit 1
+  fi
+  LIBZ="-lz"
+fi
+AC_SUBST(LIBZ)
+
+if test "$enable_pcre2grep_libbz2" = "yes"; then
+  if test "$HAVE_BZLIB_H" != "1"; then
+    echo "** Cannot --enable-pcre2grep-libbz2 because bzlib.h was not found"
+    exit 1
+  fi
+  if test "$HAVE_LIBBZ2" != "1"; then
+    echo "** Cannot --enable-pcre2grep-libbz2 because libbz2 was not found"
+    exit 1
+  fi
+  LIBBZ2="-lbz2"
+fi
+AC_SUBST(LIBBZ2)
+
+# Similarly for --enable-pcre2test-readline
+
+if test "$enable_pcre2test_libedit" = "yes"; then
+  if test "$enable_pcre2test_libreadline" = "yes"; then
+    echo "** Cannot use both --enable-pcre2test-libedit and --enable-pcre2test-readline"
+    exit 1
+  fi
+  if test "$HAVE_EDITLINE_READLINE_H" != "1" -a \
+          "$HAVE_READLINE_READLINE_H" != "1"; then
+    echo "** Cannot --enable-pcre2test-libedit because neither editline/readline.h"
+    echo "** nor readline/readline.h was found."
+    exit 1
+  fi
+  if test -z "$LIBEDIT"; then
+    echo "** Cannot --enable-pcre2test-libedit because libedit library was not found."
+    exit 1
+  fi
+fi
+
+if test "$enable_pcre2test_libreadline" = "yes"; then
+  if test "$HAVE_READLINE_H" != "1"; then
+    echo "** Cannot --enable-pcre2test-readline because readline/readline.h was not found."
+    exit 1
+  fi
+  if test "$HAVE_HISTORY_H" != "1"; then
+    echo "** Cannot --enable-pcre2test-readline because readline/history.h was not found."
+    exit 1
+  fi
+  if test -z "$LIBREADLINE"; then
+    echo "** Cannot --enable-pcre2test-readline because readline library was not found."
+    exit 1
+  fi
+fi
+
+# Handle valgrind support
+
+if test "$enable_valgrind" = "yes"; then
+  m4_ifdef([PKG_CHECK_MODULES],
+           [PKG_CHECK_MODULES([VALGRIND],[valgrind])],
+           [AC_MSG_ERROR([pkg-config not supported])])
+fi
+
+# Handle code coverage reporting support
+if test "$enable_coverage" = "yes"; then
+  if test "x$GCC" != "xyes"; then
+    AC_MSG_ERROR([Code coverage reports can only be generated when using GCC])
+  fi
+
+  # ccache is incompatible with gcov
+  AC_PATH_PROG([SHTOOL],[shtool],[false])
+  case `$SHTOOL path $CC` in
+    *ccache*) cc_ccache=yes;;
+    *) cc_ccache=no;;
+  esac
+
+  if test "$cc_ccache" = "yes"; then
+    if test -z "$CCACHE_DISABLE" -o "$CCACHE_DISABLE" != "1"; then
+      AC_MSG_ERROR([must export CCACHE_DISABLE=1 to disable ccache for code coverage])
+    fi
+  fi
+
+  AC_ARG_VAR([LCOV],[the ltp lcov program])
+  AC_PATH_PROG([LCOV],[lcov],[false])
+  if test "x$LCOV" = "xfalse"; then
+    AC_MSG_ERROR([lcov not found])
+  fi
+
+  AC_ARG_VAR([GENHTML],[the ltp genhtml program])
+  AC_PATH_PROG([GENHTML],[genhtml],[false])
+  if test "x$GENHTML" = "xfalse"; then
+    AC_MSG_ERROR([genhtml not found])
+  fi
+
+  # Set flags needed for gcov
+  GCOV_CFLAGS="-O0 -ggdb3 -fprofile-arcs -ftest-coverage"
+  GCOV_CXXFLAGS="-O0 -ggdb3 -fprofile-arcs -ftest-coverage"
+  GCOV_LIBS="-lgcov"
+  AC_SUBST([GCOV_CFLAGS])
+  AC_SUBST([GCOV_CXXFLAGS])
+  AC_SUBST([GCOV_LIBS])
+fi # enable_coverage
+
+AM_CONDITIONAL([WITH_GCOV],[test "x$enable_coverage" = "xyes"])
+
+# Produce these files, in addition to config.h.
+AC_CONFIG_FILES(
+	Makefile
+	libpcre2-8.pc
+	libpcre2-16.pc
+	libpcre2-32.pc
+	libpcre2-posix.pc
+	pcre2-config
+	src/pcre2.h
+)
+
+# Make the generated script files executable.
+AC_CONFIG_COMMANDS([script-chmod], [chmod a+x pcre2-config])
+
+# Make sure that pcre2_chartables.c is removed in case the method for
+# creating it was changed by reconfiguration.
+AC_CONFIG_COMMANDS([delete-old-chartables], [rm -f pcre2_chartables.c])
+
+AC_OUTPUT
+
+# Print out a nice little message after configure is run displaying the
+# chosen options.
+
+ebcdic_nl_code=n/a
+if test "$enable_ebcdic_nl25" = "yes"; then
+  ebcdic_nl_code=0x25
+elif test "$enable_ebcdic" = "yes"; then
+  ebcdic_nl_code=0x15
+fi
+
+cat <<EOF
+
+$PACKAGE-$VERSION configuration summary:
+
+    Install prefix .................. : ${prefix}
+    C preprocessor .................. : ${CPP}
+    C compiler ...................... : ${CC}
+    Linker .......................... : ${LD}
+    C preprocessor flags ............ : ${CPPFLAGS}
+    C compiler flags ................ : ${CFLAGS} ${VISIBILITY_CFLAGS}
+    Linker flags .................... : ${LDFLAGS}
+    Extra libraries ................. : ${LIBS}
+
+    Build 8-bit pcre2 library ....... : ${enable_pcre2_8}
+    Build 16-bit pcre2 library ...... : ${enable_pcre2_16}
+    Build 32-bit pcre2 library ...... : ${enable_pcre2_32}
+    Include debugging code .......... : ${enable_debug}
+    Enable JIT compiling support .... : ${enable_jit}
+    Enable Unicode support .......... : ${enable_unicode}
+    Newline char/sequence ........... : ${enable_newline}
+    \R matches only ANYCRLF ......... : ${enable_bsr_anycrlf}
+    \C is disabled .................. : ${enable_never_backslash_C}
+    EBCDIC coding ................... : ${enable_ebcdic}
+    EBCDIC code for NL .............. : ${ebcdic_nl_code}
+    Rebuild char tables ............. : ${enable_rebuild_chartables}
+    Use stack recursion ............. : ${enable_stack_for_recursion}
+    Internal link size .............. : ${with_link_size}
+    Nested parentheses limit ........ : ${with_parens_nest_limit}
+    Match limit ..................... : ${with_match_limit}
+    Match limit recursion ........... : ${with_match_limit_recursion}
+    Build shared libs ............... : ${enable_shared}
+    Build static libs ............... : ${enable_static}
+    Use JIT in pcre2grep ............ : ${enable_pcre2grep_jit}
+    Buffer size for pcre2grep ....... : ${with_pcre2grep_bufsize}
+    Link pcre2grep with libz ........ : ${enable_pcre2grep_libz}
+    Link pcre2grep with libbz2 ...... : ${enable_pcre2grep_libbz2}
+    Link pcre2test with libedit ..... : ${enable_pcre2test_libedit}
+    Link pcre2test with libreadline . : ${enable_pcre2test_libreadline}
+    Valgrind support ................ : ${enable_valgrind}
+    Code coverage ................... : ${enable_coverage}
+
+EOF
+
+dnl end configure.ac