Build: configure: add --enable-deprecated-libs option

Currently, this just controls whether to build and install libpe_rules.
As more libraries are deprecated, this will control them, too.

configure.ac

@@ -229,16 +229,24 @@ AC_ARG_ENABLE([hardening],
 yes_no_try "$enable_hardening" "try"
 enable_hardening=$?
 
-dnl --enable-* options: features
+dnl --enable-* options: features within Pacemaker
 
+dnl @COMPAT This should be --with-systemd
 AC_ARG_ENABLE([systemd],
     [AS_HELP_STRING([--enable-systemd],
         [enable support for managing resources via systemd @<:@try@:>@])]
 )
 yes_no_try "$enable_systemd" "try"
 enable_systemd=$?
 
-dnl --enable-* options: features inherent to Pacemaker
+AC_ARG_ENABLE([deprecated-libs],
+    [AS_HELP_STRING([--enable-deprecated-libs],
+        [Build and install deprecated C libraries @<:@yes@:>@])]
+)
+yes_no_try "$enable_deprecated_libs" "yes"
+enable_deprecated_libs=$?
+AM_CONDITIONAL([BUILD_DEPRECATED_LIBS],
+               [test $enable_deprecated_libs -ne $DISABLED])
 
 # AM_GNU_GETTEXT calls AM_NLS which defines the nls option, but it defaults
 # to enabled. We override the definition of AM_NLS to flip the default and mark
@@ -255,7 +263,7 @@ AC_DEFUN([AM_NLS],
 AM_GNU_GETTEXT([external])
 AM_GNU_GETTEXT_VERSION([0.18])
 
-dnl --with-* options: external software support, and custom locations
+dnl --with-* options: external software support, and custom values
 
 dnl This argument is defined via an M4 macro so default can be a variable
 AC_DEFUN([VERSION_ARG],
@@ -295,8 +303,7 @@ AC_ARG_WITH([bug-url],
 AS_IF([test x"${BUG_URL}" = x""],
       [BUG_URL="https://bugs.clusterlabs.org/enter_bug.cgi?product=Pacemaker"])
 
-dnl --with-* options: features
-
+dnl @COMPAT This should be --enable-cibsecrets option
 AC_ARG_WITH([cibsecrets],
     [AS_HELP_STRING([--with-cibsecrets],
         [support separate file for CIB secrets @<:@no@:>@])]

lib/Makefile.am

@@ -18,9 +18,12 @@ LIBS			= cib 		\
 pkgconfig_DATA		= $(LIBS:%=pacemaker-%.pc)	\
 			  libpacemaker.pc		\
 			  pacemaker.pc			\
-			  pacemaker-pe_rules.pc		\
 			  pacemaker-pe_status.pc
 
+if BUILD_DEPRECATED_LIBS
+pkgconfig_DATA		+= pacemaker-pe_rules.pc
+endif
+
 EXTRA_DIST		= $(pkgconfig_DATA:%=%.in)
 
 SUBDIRS	= common 	\

lib/pengine/Makefile.am

@@ -15,18 +15,19 @@ include $(top_srcdir)/mk/common.mk
 SUBDIRS = . tests
 
 ## libraries
-lib_LTLIBRARIES		= libpe_rules.la 	\
-			  libpe_status.la
+lib_LTLIBRARIES		= libpe_status.la
 check_LTLIBRARIES 	= libpe_status_test.la
 
 noinst_HEADERS		= pe_status_private.h
 
+if BUILD_DEPRECATED_LIBS
+lib_LTLIBRARIES		+= libpe_rules.la
 libpe_rules_la_LDFLAGS	= -version-info 51:0:0
-
 libpe_rules_la_CFLAGS	= $(CFLAGS_HARDENED_LIB)
 libpe_rules_la_LDFLAGS	+= $(LDFLAGS_HARDENED_LIB)
 libpe_rules_la_LIBADD	= $(top_builddir)/lib/common/libcrmcommon.la
 libpe_rules_la_SOURCES	= rules_compat.c
+endif
 
 libpe_status_la_LDFLAGS	= -version-info 56:0:0