[PATCH V2 5/5] configure: Check for libpcre

["Michał Kiedrowicz" <michal.kiedrowicz@gmail.com>]

This adds checks for libpcre based on checking for curl.

Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@gmail.com>
---
 config.mak.in |    1 +
 configure.ac  |   26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/config.mak.in b/config.mak.in
index e378534..9bab021 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -30,6 +30,7 @@ export srcdir VPATH
 ASCIIDOC7=@ASCIIDOC7@
 NEEDS_SSL_WITH_CRYPTO=@NEEDS_SSL_WITH_CRYPTO@
 NO_OPENSSL=@NO_OPENSSL@
+NO_LIBPCRE=@NO_LIBPCRE@
 NO_CURL=@NO_CURL@
 NO_EXPAT=@NO_EXPAT@
 NO_LIBGEN_H=@NO_LIBGEN_H@
diff --git a/configure.ac b/configure.ac
index fafd815..4711369 100644
--- a/configure.ac
+++ b/configure.ac
@@ -220,6 +220,17 @@ AS_HELP_STRING([--with-openssl],[use OpenSSL library (default is YES)])
 AS_HELP_STRING([],              [ARG can be prefix for openssl library and headers]),\
 GIT_PARSE_WITH(openssl))
 #
+# Define NO_LIBPCRE if you do not have libpcre installed.  git-grep cannot use
+# Perl-compatible regexes.
+#
+# Define LIBPCREDIR=/foo/bar if your libpcre header and library files are in
+# /foo/bar/include and /foo/bar/lib directories.
+#
+AC_ARG_WITH(libpcre,
+AS_HELP_STRING([--with-libpcre],[support Perl-compatible regexes (default is YES)])
+AS_HELP_STRING([],           [ARG can be also prefix for libpcre library and headers]),
+GIT_PARSE_WITH(libpcre))
+#
 # Define NO_CURL if you do not have curl installed.  git-http-pull and
 # git-http-push are not built, and you cannot use http:// and https://
 # transports.
@@ -435,6 +446,21 @@ AC_SUBST(NEEDS_SSL_WITH_CRYPTO)
 AC_SUBST(NO_OPENSSL)
 
 #
+# Define NO_LIBPCRE if you do not have libpcre installed.  git-grep cannot use
+# Perl-compatible regexes.
+#
+
+GIT_STASH_FLAGS($LIBPCREDIR)
+
+AC_CHECK_LIB([pcre], [pcre_version],
+[NO_LIBPCRE=],
+[NO_LIBPCRE=YesPlease])
+
+GIT_UNSTASH_FLAGS($LIBPCREDIR)
+
+AC_SUBST(NO_LIBPCRE)
+
+#
 # Define NO_CURL if you do not have libcurl installed.  git-http-pull and
 # git-http-push are not built, and you cannot use http:// and https://
 # transports.
-- 
1.7.3.4