Add cmake configuration files

* configure.ac: Add libgpgmepp version. Configure cmake files.
* lang/cpp/src/Makefile.am: Add targets for cmake files.
 (EXTRA_DIST): Add cmake files.

--
This should smooth the transition for downstream users that
have worked with KF5::Gpgmepp previously.

configure.ac

@@ -61,6 +61,10 @@ LIBGPGME_LT_CURRENT=25
 LIBGPGME_LT_AGE=14
 LIBGPGME_LT_REVISION=0
 
+LIBGPGMEPP_LT_CURRENT=3
+LIBGPGMEPP_LT_AGE=0
+LIBGPGMEPP_LT_REVISION=0
+
 # If the API is changed in an incompatible way: increment the next counter.
 GPGME_CONFIG_API_VERSION=1
 ##############################################
@@ -104,6 +108,9 @@ AC_CHECK_PROGS(GITLOG_TO_CHANGELOG, gitlog-to-changelog, [gitlog-to-changelog])
 AC_SUBST(LIBGPGME_LT_CURRENT)
 AC_SUBST(LIBGPGME_LT_AGE)
 AC_SUBST(LIBGPGME_LT_REVISION)
+AC_SUBST(LIBGPGMEPP_LT_CURRENT)
+AC_SUBST(LIBGPGMEPP_LT_AGE)
+AC_SUBST(LIBGPGMEPP_LT_REVISION)
 
 AC_SUBST(PACKAGE)
 AC_SUBST(VERSION)
@@ -653,6 +660,8 @@ AC_CONFIG_FILES(Makefile src/Makefile
                 src/gpgme.h)
 AC_CONFIG_FILES(src/gpgme-config, chmod +x src/gpgme-config)
 AC_CONFIG_FILES(lang/cpp/Makefile lang/cpp/src/Makefile)
+AC_CONFIG_FILES(lang/cpp/src/GpgmeppConfig.cmake.in)
+AC_CONFIG_FILES(lang/cpp/src/GpgmeppConfigVersion.cmake)
 AC_CONFIG_FILES([lang/Makefile lang/cl/Makefile lang/cl/gpgme.asd])
 AC_OUTPUT
 

lang/cpp/src/GpgmeppConfig.cmake.in.in

@@ -0,0 +1,115 @@
+# CMake Config file for GPGMEPP.
+# Copyright (C) 2016 Intevation GmbH
+#
+# This file is part of GPGMEPP.
+#
+# GPGME-CL is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# GPGME-CL is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA
+
+# based on a generated file from cmake.
+# Generated by CMake 3.0.2
+
+if("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.5)
+   message(FATAL_ERROR "CMake >= 2.6.0 required")
+endif()
+cmake_policy(PUSH)
+cmake_policy(VERSION 2.6)
+#----------------------------------------------------------------
+# Generated CMake target import file.
+#----------------------------------------------------------------
+
+# Commands may need to know the format version.
+set(CMAKE_IMPORT_FILE_VERSION 1)
+
+# Protect against multiple inclusion, which would fail when already imported targets are added once more.
+set(_targetsDefined)
+set(_targetsNotDefined)
+set(_expectedTargets)
+foreach(_expectedTarget KF5::Gpgmepp KF5::QGpgme)
+  list(APPEND _expectedTargets ${_expectedTarget})
+  if(NOT TARGET ${_expectedTarget})
+    list(APPEND _targetsNotDefined ${_expectedTarget})
+  endif()
+  if(TARGET ${_expectedTarget})
+    list(APPEND _targetsDefined ${_expectedTarget})
+  endif()
+endforeach()
+if("${_targetsDefined}" STREQUAL "${_expectedTargets}")
+  set(CMAKE_IMPORT_FILE_VERSION)
+  cmake_policy(POP)
+  return()
+endif()
+if(NOT "${_targetsDefined}" STREQUAL "")
+  message(FATAL_ERROR "Some (but not all) targets in this export set were already defined.\nTargets Defined: ${_targetsDefined}\nTargets not yet defined: ${_targetsNotDefined}\n")
+endif()
+unset(_targetsDefined)
+unset(_targetsNotDefined)
+unset(_expectedTargets)
+
+# Compute the installation prefix relative to this file.
+get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+
+# Create imported target Gpgmepp
+add_library(Gpgmepp SHARED IMPORTED)
+
+set_target_properties(Gpgmepp PROPERTIES
+  INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include/gpgme++"
+  INTERFACE_LINK_LIBRARIES "@libdir@/libgpgme.dll.a;@LIBASSUAN_LIBS@;@GPG_ERROR_LIBS@"
+)
+
+# Create imported target QGpgme
+#add_library(QGpgme SHARED IMPORTED)
+
+#set_target_properties(KF5::QGpgme PROPERTIES
+#   INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include/qgpgme"
+   #  INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX} TODO"
+#  INTERFACE_LINK_LIBRARIES "Qt5::Core"
+#)
+
+if(CMAKE_VERSION VERSION_LESS 2.8.12)
+  message(FATAL_ERROR "This file relies on consumers using CMake 2.8.12 or greater.")
+endif()
+
+# Cleanup temporary variables.
+set(_IMPORT_PREFIX)
+
+# Loop over all imported files and verify that they actually exist
+foreach(target ${_IMPORT_CHECK_TARGETS} )
+  foreach(file ${_IMPORT_CHECK_FILES_FOR_${target}} )
+    if(NOT EXISTS "${file}" )
+      message(FATAL_ERROR "The imported target \"${target}\" references the file
+   \"${file}\"
+but this file does not exist.  Possible reasons include:
+* The file was deleted, renamed, or moved to another location.
+* An install or uninstall procedure did not complete successfully.
+* The installation package was faulty and contained
+   \"${CMAKE_CURRENT_LIST_FILE}\"
+but not all the files it references.
+")
+    endif()
+  endforeach()
+  unset(_IMPORT_CHECK_FILES_FOR_${target})
+endforeach()
+unset(_IMPORT_CHECK_TARGETS)
+
+# This file does not depend on other imported targets which have
+# been exported from the same project but in a separate export set.
+
+# Commands beyond this point should not need to know the version.
+set(CMAKE_IMPORT_FILE_VERSION)
+cmake_policy(POP)

lang/cpp/src/GpgmeppConfigVersion.cmake.in

@@ -0,0 +1,31 @@
+# CMake Version file for GPGMEPP.
+# Copyright (C) 2016 Intevation GmbH
+#
+# This file is part of GPGMEPP.
+#
+# GPGME-CL is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# GPGME-CL is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA
+
+# based on a generated file from cmake.
+set(PACKAGE_VERSION "@LIBGPGMEPP_LT_CURRENT@.@LIBGPGMEPP_LT_AGE@.@LIBGPGMEPP_LT_REVISION@.@BUILD_REVISION@")
+
+if("${PACKAGE_VERSION}" VERSION_LESS "${PACKAGE_FIND_VERSION}" )
+  set(PACKAGE_VERSION_COMPATIBLE FALSE)
+else()
+  set(PACKAGE_VERSION_COMPATIBLE TRUE)
+  if( "${PACKAGE_FIND_VERSION}" STREQUAL "${PACKAGE_VERSION}")
+    set(PACKAGE_VERSION_EXACT TRUE)
+  endif()
+endif()

lang/cpp/src/Makefile.am

@@ -18,6 +18,8 @@
 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 # 02111-1307, USA
 
+EXTRA_DIST = GpgmeppConfig.cmake.in.in GpgmeConfigVersion.cmake.in
+
 lib_LTLIBRARIES = libgpgmepp.la
 
 main_sources = \
@@ -57,3 +59,22 @@ libgpgmepp_la_SOURCES = $(main_sources) $(gpgmepp_headers) context_vanilla.cpp \
 AM_CPPFLAGS = @GPG_ERROR_CFLAGS@ @LIBASSUAN_CFLAGS@ -DBUILDING_GPGMEPP
 
 libgpgmepp_la_LIBADD = ../../../src/libgpgme.la @LIBASSUAN_LIBS@
+
+GpgmeppConfig.cmake: GpgmeppConfig.cmake.in
+	sed -e 's|[@]resolved_libdir@|$(libdir)|g' < "$<" > "$@"
+
+install-cmake-files: GpgmeppConfig.cmake GpgmeppConfigVersion.cmake
+	-$(INSTALL) -d $(DESTDIR)$(libdir)/cmake/Gpgmepp
+	$(INSTALL) GpgmeppConfig.cmake \
+        $(DESTDIR)$(libdir)/cmake/Gpgmepp/GpgmeppConfig.cmake
+	$(INSTALL) GpgmeppConfigVersion.cmake \
+        $(DESTDIR)$(libdir)/cmake/Gpgmepp/GpgmeppConfigVersion.cmake
+
+uninstall-cmake-files:
+	-rm $(DESTDIR)$(libdir)/cmake/Gpgmepp/GpgmeppConfigVersion.cmake
+	-rm $(DESTDIR)$(libdir)/cmake/Gpgmepp/GpgmeppConfig.cmake
+	-rmdir $(DESTDIR)$(libdir)/cmake/Gpgmepp/
+
+install-data-local: install-cmake-files
+
+uninstall-local: uninstall-cmake-files