Add a patch for memcached to ccache along with a slave devel/ccache-memcached port.

This patch is not safe for WITH_CCACHE_BUILD support yet as that causes all
ports to depend on devel/ccache.  Enabling that patch would then cause the
new devel/libmemcached dependency to require devel/ccache which is a cyclic
dependency.  The autoconf dependency also causes issues.

Add a devel/ccache-memcached slave port that would allow a user to use
the ccache+memcached package manually with ports without WITH_CCACHE_BUILD.

This patch comes from https://github.com/ccache/ccache/pull/58 and has been
an ongoing effort over a few years to be merged into the mainline of ccache.
Documenation for it can be found in the MANUAL file at:

  /usr/local/share/doc/ccache/MANUAL.txt

Sponsored by:	Dell EMC Isilon

devel/Makefile

@@ -234,6 +234,7 @@
     SUBDIR += cbrowser
     SUBDIR += cc65
     SUBDIR += ccache
+    SUBDIR += ccache-memcached
     SUBDIR += cccc
     SUBDIR += ccdoc
     SUBDIR += ccons

devel/ccache-memcached/Makefile

@@ -0,0 +1,11 @@
+# $FreeBSD$
+
+PKGNAMESUFFIX=	-memcached
+
+MASTERDIR=	${.CURDIR}/../ccache
+
+OPTIONS_SLAVE=	MEMCACHED
+
+CONFLICTS_INSTALL=	ccache-[0-9]*
+
+.include "${MASTERDIR}/Makefile"

devel/ccache/Makefile

@@ -13,26 +13,43 @@ COMMENT=	Tool to minimize the compile time of C/C++ programs
 
 LICENSE=	GPLv3
 
+CONFLICTS_INSTALL=	ccache-memcached-[0-9]*
+
 GNU_CONFIGURE=	yes
 
 HOWTO=		ccache-howto-freebsd.txt
 CCLINKDIR=	libexec/ccache
 SUB_FILES=	${HOWTO} world-ccache pkg-message ccache-update-links.sh
 
-PORTDOCS=	ccache-howto-freebsd.txt MANUAL.html
+PORTDOCS=	ccache-howto-freebsd.txt MANUAL.html MANUAL.txt
 
-OPTIONS_DEFINE=	CLANGLINK LLVMLINK STATIC DOCS TINDERBOX
+OPTIONS_DEFINE=	CLANGLINK LLVMLINK STATIC DOCS TINDERBOX MEMCACHED
 OPTIONS_DEFAULT=CLANGLINK LLVMLINK
 
 CLANGLINK_DESC=	Create clang compiler links if clang is installed
 LLVMLINK_DESC=	Create llvm compiler links if llvm is installed
 TINDERBOX_DESC=	Create tarball for tinderbox usage
+MEMCACHED_DESC=	Build in experimental Memcached support
 
 USES=		compiler
+
+MEMCACHED_EXTRA_PATCHES=	${FILESDIR}/extra-patch-memcached:-p1
+MEMCACHED_CONFIGURE_ENABLE=	memcached
+MEMCACHED_USES=			autoreconf pkgconfig
+MEMCACHED_LIB_DEPENDS=		libmemcached.so:databases/libmemcached
+MEMCACHED_LDFLAGS=		-L${LOCALBASE}/lib
+MEMCACHED_CFLAGS=		-I${LOCALBASE}/include
+
+.if defined(WITH_CCACHE_BUILD) && empty(OPTIONS_SLAVE:MMEMCACHED)
 # Don't allow autoreconf. We want no dependencies on this to keep
 # WITH_CCACHE_BUILD working.
 USES:=		${USES:Nautoreconf}
 
+MEMCACHED_IGNORE=		MEMCACHED cannot be combined with WITH_CCACHE_BUILD.  Use devel/ccache-memcached
+# XXX: This needs more testing with Poudriere before enabling. Also bsd.options.mk support.
+#MEMCACHED_DEPENDS_ARGS+= NO_CCACHE=1
+.endif
+
 OPTIONS_SUB=	yes
 
 STATIC_LDFLAGS=	-static
@@ -93,6 +110,7 @@ do-install-TINDERBOX-on:
 do-install-DOCS-on:
 	${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/MANUAL.html ${STAGEDIR}${DOCSDIR}
+	${INSTALL_DATA} ${WRKSRC}/MANUAL.txt ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKDIR}/${HOWTO} ${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.post.mk>

devel/ccache/files/patch-configure.ac

@@ -0,0 +1,19 @@
+--- m4/feature_macros.m4.orig	2017-02-13 15:05:54.405968000 -0800
++++ m4/feature_macros.m4	2017-02-13 15:16:32.931104000 -0800
+@@ -120,7 +120,7 @@
+                 Define to the level of X/Open that your system supports)
+       ;;
+     *)
+-      AC_DEFINE(_XOPEN_SOURCE, 600,
++      AC_DEFINE(_XOPEN_SOURCE, 700,
+                 Define to the level of X/Open that your system supports)
+       ;;
+   esac
+@@ -142,6 +142,6 @@
+       ;;
+   esac
+ 
+-  AC_DEFINE(_POSIX_C_SOURCE, 200112L, Define to activate features from IEEE Stds 1003.1-2001)
++  AC_DEFINE(_POSIX_C_SOURCE, 200809L, Define to activate features from IEEE Stds 1003.1-2001)
+ 
+ fi