Add macro in CommonCPackUtils to help package subprojects

Author: Raphael Dumusc

Common.cmake

@@ -146,6 +146,7 @@ include(CommonInstallProject)
 include(CommonLibrary)
 include(CommonCompiler)
 include(CommonCoverage)
+include(CommonCPackUtils)
 include(CommonSmokeTest)
 include(GitInfo)
 include(GitTargets)

CommonCPackUtils.cmake

@@ -0,0 +1,44 @@
+# Copyright (c) 2017 Raphael.Dumusc@epfl.ch
+#
+# Helper function for packaging subprojects using CommonCPack.
+#
+# Add subproject dependencies to the current project's package:
+#   add_deb_depends(<Subproject>
+#     [PACKAGE_NAME <subproject_package_name>]
+#     [MIN_VERSION <subproject_min_version>] [<subproject_deb_depends>])
+#
+# Arguments:
+# * Subproject: name of the subproject
+# * PACKAGE_NAME: if subproject package name differs from lower_case(Subproject)
+# * MIN_VERSION: minimum version of the subproject's package
+# * ARGN: list of dependencies of the subproject
+#
+# Output (list append):
+# * NAME_PACKAGE_REPLACES: Subproject package name if it is being built
+# * NAME_PACKAGE_DEB_DEPENDS: the list of Subproject's dependencies if it is
+#   being built; otherwise its package name.
+
+macro(add_deb_depends Subproject)
+  set(_opts)
+  set(_singleArgs PACKAGE_NAME MIN_VERSION)
+  set(_multiArgs)
+  cmake_parse_arguments(THIS "${_opts}" "${_singleArgs}" "${_multiArgs}"
+    ${ARGN})
+  set(_packages ${THIS_UNPARSED_ARGUMENTS})
+
+  if(THIS_PACKAGE_NAME)
+    set(_subproject_pkg ${THIS_PACKAGE_NAME})
+  else()
+    string(TOLOWER ${Subproject} _subproject_pkg)
+  endif()
+
+  if(${Subproject}_IS_SUBPROJECT)
+    list(APPEND ${UPPER_PROJECT_NAME}_PACKAGE_REPLACES ${_subproject_pkg})
+    list(APPEND ${UPPER_PROJECT_NAME}_PACKAGE_DEB_DEPENDS ${_packages})
+  else()
+    if(THIS_MIN_VERSION)
+      set(_subproject_pkg "${_subproject_pkg} (>= ${THIS_MIN_VERSION})")
+    endif()
+    list(APPEND ${UPPER_PROJECT_NAME}_PACKAGE_DEB_DEPENDS "${_subproject_pkg}")
+  endif()
+endmacro()