Define Git and date constants in executables only

CHANGELOG.md

@@ -24,6 +24,7 @@
 - Dev: Fixed undefined behavior when loading non-existant credentials. (#4673)
 - Dev: Added support for compiling with `sccache`. (#4678)
 - Dev: Added `sccache` in Windows CI. (#4678)
+- Dev: Moved preprocessor Git and date definitions to executables only. (#4681)
 
 ## 2.4.4
 

CMakeLists.txt

@@ -185,6 +185,16 @@ if (BUILD_WITH_CRASHPAD)
     add_subdirectory("${CMAKE_SOURCE_DIR}/lib/crashpad" EXCLUDE_FROM_ALL)
 endif()
 
+# Used to provide a date of build in the About page (for nightly builds). Getting the actual time of
+# compilation in CMake is a more involved, as documented in https://stackoverflow.com/q/24292898.
+# For CI runs, however, the date of build file generation should be consistent with the date of
+# compilation so this approximation is "good enough" for our purpose.
+if (DEFINED ENV{CHATTERINO_SKIP_DATE_GEN})
+    set(cmake_gen_date "1970-01-01")
+else ()
+    string(TIMESTAMP cmake_gen_date "%Y-%m-%d")
+endif ()
+
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 

src/CMakeLists.txt

@@ -1,4 +1,5 @@
 set(LIBRARY_PROJECT "${PROJECT_NAME}-lib")
+set(VERSION_PROJECT "${LIBRARY_PROJECT}-version")
 set(EXECUTABLE_PROJECT "${PROJECT_NAME}")
 add_compile_definitions(QT_DISABLE_DEPRECATED_BEFORE=0x050F00)
 
@@ -46,8 +47,6 @@ set(SOURCE_FILES
         common/NetworkResult.hpp
         common/QLogging.cpp
         common/QLogging.hpp
-        common/Version.cpp
-        common/Version.hpp
         common/WindowDescriptors.cpp
         common/WindowDescriptors.hpp
 
@@ -799,34 +798,34 @@ set_target_properties(${LIBRARY_PROJECT}
     AUTOUIC ON
     )
 
-# Used to provide a date of build in the About page (for nightly builds). Getting the actual time of
-# compilation in CMake is a more involved, as documented in https://stackoverflow.com/q/24292898.
-# For CI runs, however, the date of build file generation should be consistent with the date of
-# compilation so this approximation is "good enough" for our purpose.
-if (DEFINED ENV{CHATTERINO_SKIP_DATE_GEN})
-    set(cmake_gen_date "1970-01-01")
-else ()
-    string(TIMESTAMP cmake_gen_date "%Y-%m-%d")
-endif ()
+# The version project has definitions about the build.
+# To avoid recompilations because of changing preprocessor definitions,
+# this is its own project.
+set(VERSION_SOURCE_FILES common/Version.cpp common/Version.hpp)
+add_library(${VERSION_PROJECT} STATIC ${VERSION_SOURCE_FILES})
+
+# source group for IDEs
+source_group(TREE ${CMAKE_SOURCE_DIR} FILES ${VERSION_SOURCE_FILES})
+target_include_directories(${VERSION_PROJECT} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+target_link_libraries(${VERSION_PROJECT} PRIVATE Qt${MAJOR_QT_VERSION}::Core)
+target_compile_definitions(${VERSION_PROJECT} PRIVATE
+    CHATTERINO_GIT_HASH=\"${GIT_HASH}\"
+    CHATTERINO_GIT_RELEASE=\"${GIT_RELEASE}\"
+    CHATTERINO_GIT_COMMIT=\"${GIT_COMMIT}\"
+    CHATTERINO_GIT_MODIFIED=${GIT_MODIFIED}
+
+    CHATTERINO_CMAKE_GEN_DATE=\"${cmake_gen_date}\"
+)
+
+target_link_libraries(${LIBRARY_PROJECT} PRIVATE ${VERSION_PROJECT})
 
 target_compile_definitions(${LIBRARY_PROJECT} PUBLIC
     CHATTERINO
     UNICODE
     AB_CUSTOM_SETTINGS
     IRC_STATIC
     IRC_NAMESPACE=Communi
-
-    CHATTERINO_GIT_HASH=\"${GIT_HASH}\"
-    CHATTERINO_GIT_RELEASE=\"${GIT_RELEASE}\"
-    CHATTERINO_GIT_COMMIT=\"${GIT_COMMIT}\"
-
-    CHATTERINO_CMAKE_GEN_DATE=\"${cmake_gen_date}\"
     )
-if (GIT_MODIFIED)
-    target_compile_definitions(${LIBRARY_PROJECT} PUBLIC
-        CHATTERINO_GIT_MODIFIED
-        )
-endif ()
 if (USE_SYSTEM_QTKEYCHAIN)
     target_compile_definitions(${LIBRARY_PROJECT} PUBLIC
         CMAKE_BUILD

src/common/NetworkRequest.cpp

@@ -184,8 +184,9 @@ void NetworkRequest::execute()
 
 void NetworkRequest::initializeDefaultValues()
 {
-    const auto userAgent = QString("chatterino/%1 (%2)")
-                               .arg(CHATTERINO_VERSION, CHATTERINO_GIT_HASH)
+    const auto userAgent = QStringLiteral("chatterino/%1 (%2)")
+                               .arg(Version::instance().version(),
+                                    Version::instance().commitHash())
                                .toUtf8();
 
     this->data->request_.setRawHeader("User-Agent", userAgent);

src/common/Version.cpp

@@ -4,27 +4,14 @@
 
 #include <QFileInfo>
 
-#define UGLYMACROHACK1(s) #s
-#define FROM_EXTERNAL_DEFINE(s) UGLYMACROHACK1(s)
-
 namespace chatterino {
 
 Version::Version()
+    : version_(CHATTERINO_VERSION)
+    , commitHash_(QStringLiteral(CHATTERINO_GIT_HASH))
+    , isModified_(CHATTERINO_GIT_MODIFIED == 1)
+    , dateOfBuild_(QStringLiteral(CHATTERINO_CMAKE_GEN_DATE))
 {
-    this->version_ = CHATTERINO_VERSION;
-
-    this->commitHash_ =
-        QString(FROM_EXTERNAL_DEFINE(CHATTERINO_GIT_HASH)).remove('"');
-
-#ifdef CHATTERINO_GIT_MODIFIED
-    this->isModified_ = true;
-#endif
-
-#ifdef CHATTERINO_CMAKE_GEN_DATE
-    this->dateOfBuild_ =
-        QString(FROM_EXTERNAL_DEFINE(CHATTERINO_CMAKE_GEN_DATE)).remove('"');
-#endif
-
     this->fullVersion_ = "Chatterino ";
     if (Modes::instance().isNightly)
     {

src/common/Version.hpp

@@ -38,8 +38,42 @@
 #    define CHATTERINO_OS "unknown"
 #endif
 
+#define CHATTERINO_DECLARE_BUILD_CONSTANTS()              \
+    namespace chatterino::detail::version {               \
+    QString gitHash()                                     \
+    {                                                     \
+        return QStringLiteral(CHATTERINO_GIT_HASH);       \
+    }                                                     \
+    QString gitRelease()                                  \
+    {                                                     \
+        return QStringLiteral(CHATTERINO_GIT_RELEASE);    \
+    }                                                     \
+    QString gitCommit()                                   \
+    {                                                     \
+        return QStringLiteral(CHATTERINO_GIT_COMMIT);     \
+    }                                                     \
+    bool gitModified()                                    \
+    {                                                     \
+        return CHATTERINO_GIT_MODIFIED == 1;              \
+    }                                                     \
+    QString cmakeGenDate()                                \
+    {                                                     \
+        return QStringLiteral(CHATTERINO_CMAKE_GEN_DATE); \
+    }                                                     \
+    }  // namespace chatterino::detail::version
+
 namespace chatterino {
 
+namespace detail::version {
+
+    extern QString gitHash();
+    extern QString gitRelease();
+    extern QString gitCommit();
+    extern bool gitModified();
+    extern QString cmakeGenDate();
+
+}  // namespace detail::version
+
 class Version
 {
 public:

src/providers/liveupdates/BasicPubSubManager.hpp

@@ -87,8 +87,11 @@ class BasicPubSubManager
         this->websocketClient_.set_fail_handler([this](auto hdl) {
             this->onConnectionFail(hdl);
         });
-        this->websocketClient_.set_user_agent("Chatterino/" CHATTERINO_VERSION
-                                              " (" CHATTERINO_GIT_HASH ")");
+        this->websocketClient_.set_user_agent(
+            QStringLiteral("Chatterino/%1 (%2)")
+                .arg(Version::instance().version(),
+                     Version::instance().commitHash())
+                .toStdString());
     }
 
     virtual ~BasicPubSubManager() = default;