Remove support for v1 of the PCRE library

Remove support for using version 1 of the PCRE library. Its use has
been discouraged by upstream for a long time, and it's in a
bugfix-only state.

Anyone who was relying on v1 in particular got a nudge to move to v2
in e6c531b808 (Makefile: make USE_LIBPCRE=YesPlease mean v2, not v1,
2018-03-11), which was first released as part of v2.18.0.

With this the LIBPCRE2 test prerequisites is redundant to PCRE. But
I'm keeping it for self-documentation purposes, and to avoid conflict
with other in-flight PCRE patches.

I'm also not changing all of our own "pcre2" names to "pcre", i.e. the
inverse of 6d4b5747f0 (grep: change internal *pcre* variable &
function names to be *pcre1*, 2017-05-25). I don't see the point, and
it makes the history/blame harder to read. Maybe if there's ever a
PCRE v3...

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 43 deletions

diff --git a/configure.ac b/configure.ac
index 66aedb9288..031e8d3fee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -252,16 +252,17 @@ GIT_PARSE_WITH([openssl]))
 # Define USE_LIBPCRE if you have and want to use libpcre. Various
 # commands such as log and grep offer runtime options to use
 # Perl-compatible regular expressions instead of standard or extended
-# POSIX regular expressions.
-#
-# USE_LIBPCRE is a synonym for USE_LIBPCRE2, define USE_LIBPCRE1
-# instead if you'd like to use the legacy version 1 of the PCRE
-# library. Support for version 1 will likely be removed in some future
-# release of Git, as upstream has all but abandoned it.
+# POSIX regular expressions. Only libpcre version 2 is supported.
 #
 # Define LIBPCREDIR=/foo/bar if your PCRE header and library files are in
 # /foo/bar/include and /foo/bar/lib directories.
 #
+
+AC_ARG_WITH(libpcre1,
+AS_HELP_STRING([--with-libpcre1],[DEPRECATED]),
+    AC_MSG_ERROR([support for --with-libpcre1 has been removed. Use --with-libpcre2!])
+    )
+
 AC_ARG_WITH(libpcre,
 AS_HELP_STRING([--with-libpcre],[synonym for --with-libpcre2]),
     if test "$withval" = "no"; then
@@ -277,22 +278,6 @@ AS_HELP_STRING([--with-libpcre],[synonym for --with-libpcre2]),
 	GIT_CONF_SUBST([LIBPCREDIR])
     fi)
 
-AC_ARG_WITH(libpcre1,
-AS_HELP_STRING([--with-libpcre1],[support Perl-compatible regexes via libpcre1 (default is NO)])
-AS_HELP_STRING([],           [ARG can be also prefix for libpcre library and headers]),
-    if test "$withval" = "no"; then
-	USE_LIBPCRE1=
-    elif test "$withval" = "yes"; then
-	USE_LIBPCRE1=YesPlease
-    else
-	USE_LIBPCRE1=YesPlease
-	LIBPCREDIR=$withval
-	AC_MSG_NOTICE([Setting LIBPCREDIR to $LIBPCREDIR])
-        dnl USE_LIBPCRE1 can still be modified below, so don't substitute
-        dnl it yet.
-	GIT_CONF_SUBST([LIBPCREDIR])
-    fi)
-
 AC_ARG_WITH(libpcre2,
 AS_HELP_STRING([--with-libpcre2],[support Perl-compatible regexes via libpcre2 (default is NO)])
 AS_HELP_STRING([],           [ARG can be also prefix for libpcre library and headers]),
@@ -300,10 +285,6 @@ AS_HELP_STRING([],           [ARG can be also prefix for libpcre library and hea
         AC_MSG_ERROR([Only supply one of --with-libpcre or its synonym --with-libpcre2!])
     fi
 
-    if test -n "$USE_LIBPCRE1"; then
-        AC_MSG_ERROR([Only supply one of --with-libpcre1 or --with-libpcre2!])
-    fi
-
     if test "$withval" = "no"; then
 	USE_LIBPCRE2=
     elif test "$withval" = "yes"; then
@@ -554,25 +535,9 @@ GIT_CONF_SUBST([NEEDS_SSL_WITH_CRYPTO])
 GIT_CONF_SUBST([NO_OPENSSL])
 
 #
-# Handle the USE_LIBPCRE1 and USE_LIBPCRE2 options potentially set
-# above.
+# Handle the USE_LIBPCRE options potentially set above.
 #
 
-if test -n "$USE_LIBPCRE1"; then
-
-GIT_STASH_FLAGS($LIBPCREDIR)
-
-AC_CHECK_LIB([pcre], [pcre_version],
-[USE_LIBPCRE1=YesPlease],
-[USE_LIBPCRE1=])
-
-GIT_UNSTASH_FLAGS($LIBPCREDIR)
-
-GIT_CONF_SUBST([USE_LIBPCRE1])
-
-fi
-
-
 if test -n "$USE_LIBPCRE2"; then
 
 GIT_STASH_FLAGS($LIBPCREDIR)