this compiles

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.13)
 set(MSG_PREFIX "fsfw |")
 
 # Add the cmake folder so the FindSphinx module is found
-list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake" )
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake-modules/bilke")
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake-modules/rpavlik")
 
@@ -16,17 +16,18 @@ set(FSFW_SUBVERSION_IF_GIT_FAILS 0)
 set(FSFW_REVISION_IF_GIT_FAILS 0)
 
 set(FSFW_GIT_VER_HANDLING_OK FALSE)
-# Version handling
-if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git)
-    message(STATUS "${MSG_PREFIX} Determining version information with git")
-    include(FsfwHelpers)
-    determine_version_with_git("--exclude" "docker_*")
-    if(GIT_INFO)
+# Check whether we got any revision (which isn't
+# always the case, e.g. when someone downloaded a zip
+# file from Github instead of a checkout)
+message(STATUS "${MSG_PREFIX} Determining version information with git")
+include(FsfwHelpers)
+determine_version_with_git("--exclude" "docker_*")
+if(GIT_INFO)
     set(FSFW_GIT_INFO ${GIT_INFO} CACHE STRING "Version information retrieved with git describe" FORCE)
-        list(GET FSFW_GIT_INFO 1 FSFW_VERSION)
-        list(GET FSFW_GIT_INFO 2 FSFW_SUBVERSION)
-        list(GET FSFW_GIT_INFO 3 FSFW_REVISION)
-        list(GET FSFW_GIT_INFO 4 FSFW_VCS_INFO)
+    list(GET FSFW_GIT_INFO 1 FSFW_VERSION_MAJOR)
+    list(GET FSFW_GIT_INFO 2 FSFW_VERSION_MINOR)
+    list(GET FSFW_GIT_INFO 3 FSFW_VERSION_REVISION)
+    list(GET FSFW_GIT_INFO 4 FSFW_VERSION_VCS_INFO)
     if(NOT FSFW_VERSION)
         set(FSFW_VERSION ${FSFW_VERSION_IF_GIT_FAILS})
     endif()
@@ -37,16 +38,20 @@ if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git)
         set(FSFW_REVISION ${FSFW_REVISION_IF_GIT_FAILS})
     endif()
     set(FSFW_GIT_VER_HANDLING_OK TRUE)
-   else()
+else()
     set(FSFW_GIT_VER_HANDLING_OK FALSE)
-   endif()
 endif()
+
 if(NOT FSFW_GIT_VER_HANDLING_OK)
     set(FSFW_VERSION ${FSFW_VERSION_IF_GIT_FAILS})
     set(FSFW_SUBVERSION ${FSFW_SUBVERSION_IF_GIT_FAILS})
     set(FSFW_REVISION ${FSFW_REVISION_IF_GIT_FAILS})
+    set(GIT_REV "N/A")
+    set(GIT_DIFF "")
+    set(GIT_BRANCH "N/A")
 endif()
 
+
 set(LIB_FSFW_NAME fsfw)
 project(${LIB_FSFW_NAME} VERSION ${FSFW_VERSION}.${FSFW_SUBVERSION}.${FSFW_REVISION})
 
@@ -245,7 +250,7 @@ else()
 endif()
 
 configure_file(src/fsfw/FSFW.h.in fsfw/FSFW.h)
-configure_file(src/fsfw/FSFWVersion.h.in fsfw/FSFWVersion.h)
+# configure_file(src/fsfw/FSFWVersion.h.in fsfw/FSFWVersion.h)
 
 message(STATUS "${MSG_PREFIX} Compiling FSFW for the ${FSFW_OS_NAME} operating system")
 
@@ -455,3 +460,18 @@ add_custom_command(
    POST_BUILD
    COMMENT ${POST_BUILD_COMMENT}
 )
+
+# Add a custom command that produces version.cpp, plus
+# a dummy output that's not actually produced, in order
+# to force version.cmake to always be re-run before the build
+add_custom_command(
+    TARGET ${LIB_FSFW_NAME}
+    COMMAND ${CMAKE_COMMAND} -DVERSION_DIR=${FSFW_SOURCES_DIR}
+            -DVERSION_MAJOR=${FSFW_VERSION_MAJOR}
+            -DVERSION_MINOR=${FSFW_VERSION_MINOR}
+            -DVERSION_REVISION=${FSFW_VERSION_REVISION}
+            -DVERSION_VCS_INFO=${FSFW_VERSION_VCS_INFO}
+            -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/version.cmake
+    BYPRODUCTS ${FSFW_SOURCES_DIR}/versionAutogen.cpp
+    COMMENT ""
+)

cmake/FsfwHelpers.cmake

@@ -8,6 +8,7 @@
 function(determine_version_with_git)
     include(GetGitRevisionDescription)
     git_describe(VERSION ${ARGN})
+    get_git_head_revision(GIT_BRANCH HASH_VAR)
     string(FIND ${VERSION} "." VALID_VERSION)
     if(VALID_VERSION EQUAL -1)
         message(WARNING "Version string ${VERSION} retrieved with git describe is invalid")
@@ -18,11 +19,14 @@ function(determine_version_with_git)
     string(REGEX REPLACE "^v[0-9]+\\.([0-9]+).*" "\\1" _VERSION_MINOR "${VERSION}")
     string(REGEX REPLACE "^v[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" _VERSION_PATCH "${VERSION}")
     string(REGEX REPLACE "^v[0-9]+\\.[0-9]+\\.[0-9]+-(.*)" "\\1" VERSION_SHA1 "${VERSION}")
+    string(STRIP "${GIT_BRANCH}" GIT_BRANCH)
     set(GIT_INFO ${VERSION})
     list(APPEND GIT_INFO ${_VERSION_MAJOR})
     list(APPEND GIT_INFO ${_VERSION_MINOR})
     list(APPEND GIT_INFO ${_VERSION_PATCH})
     list(APPEND GIT_INFO ${VERSION_SHA1})
     set(GIT_INFO ${GIT_INFO} PARENT_SCOPE)
+    set(GIT_BRANCH ${GIT_BRANCH} PARENT_SCOPE)
+    message(STATUS "${MSG_PREFIX} git branch ${GIT_BRANCH}")
     message(STATUS "${MSG_PREFIX} Set git version info into GIT_INFO from the git tag ${VERSION}")
 endfunction()

cmake/version.cmake

@@ -0,0 +1,38 @@
+if(NOT DEFINED VERSION_MAJOR)
+    message(WARNING "version.cmake | No VERSION_MAJOR variable passed. Setting to 0")
+    set(VERSION_MAJOR 0)
+endif()
+if(NOT DEFINED VERSION_MINOR)
+    message(WARNING "version.cmake | No VERSION_MINOR variable passed. Setting to 0")
+    set(VERSION_MINOR 0)
+endif()
+if(NOT DEFINED VERSION_REVISION)
+    message(WARNING "version.cmake | No VERSION_REVISION variable passed. Setting to 0")
+    set(VERSION_REVISION 0)
+endif()
+if(NOT DEFINED VERSION_VCS_INFO)
+    set(VERSION_VCS_INFO "")
+endif()
+
+set(VERSION_TO_SET "#include \"version.h\"
+
+namespace fsfw {
+
+const int FSFW_VERSION_MAJOR = ${VERSION_MAJOR};
+const int FSFW_VERSION_MINOR = ${VERSION_MINOR};
+const int FSFW_VERSION_REVISION = ${VERSION_MINOR};
+const char FSFW_VCS_INFO[] = \"${VERSION_VCS_INFO}\";
+
+};
+")
+
+if(EXISTS ${VERSION_DIR}/versionAutogen.cpp)
+    file(READ ${VERSION_DIR}/versionAutogen.cpp OLD_VERSION)
+else()
+    set(OLD_VERSION "")
+endif()
+
+if (NOT "${VERSION_TO_SET}" STREQUAL "${OLD_VERSION}")
+    message(STATUS "Updating versionAutogen.cpp file")
+    file(WRITE ${VERSION_DIR}/versionAutogen.cpp "${VERSION_TO_SET}")
+endif()

src/fsfw/CMakeLists.txt

@@ -1,5 +1,6 @@
 target_sources(${LIB_FSFW_NAME} PRIVATE
     version.cpp
+    versionAutogen.cpp
 )
 
 # Core

src/fsfw/FSFWVersion.h.in

@@ -1,11 +0,0 @@
-#ifndef FSFW_VERSION_H_
-#define FSFW_VERSION_H_
-
-// Versioning is managed in project CMakeLists.txt file
-static constexpr int FSFW_VERSION_MAJOR = @FSFW_VERSION@;
-static constexpr int FSFW_VERSION_MINOR = @FSFW_SUBVERSION@;
-static constexpr int FSFW_VERSION_REVISION = @FSFW_REVISION@;
-// Also contains CST (Commits since tag) information
-static const char FSFW_VCS_INFO[] = "@FSFW_VCS_INFO@";
-
-#endif /* FSFW_VERSION_H_ */

src/fsfw/version.h

@@ -57,7 +57,12 @@ class Version {
   void getVersion(char* str, size_t maxLen) const;
 };
 
-extern const Version FSFW_VERSION;
+extern const int FSFW_VERSION_MAJOR;
+extern const int FSFW_VERSION_MINOR;
+extern const int FSFW_VERSION_REVISION;
+extern const char FSFW_VCS_INFO[];
+
+extern const fsfw::Version FSFW_VERSION;
 
 }  // namespace fsfw
 

src/fsfw/versionAutogen.cpp

@@ -0,0 +1,10 @@
+#include "version.h"
+
+namespace fsfw {
+
+const int FSFW_VERSION_MAJOR = 4;
+const int FSFW_VERSION_MINOR = 0;
+const int FSFW_VERSION_REVISION = 0;
+const char FSFW_VCS_INFO[] = "285-gaa4e2d72";
+
+};