Print Chimera version instead of LLVM version (#234)

This is to resolve #157. This PR prints Chimera version instead of LLVM version that is used for building Chimera.

Now `chimera --version` prints `Chimera 0.1.0` where the version numbers are defined in `CMakeLists.txt`.

Depends on #233

Author: jslee02

CMakeLists.txt

@@ -9,6 +9,14 @@ set(SHARE_INSTALL_DIR "share/${PROJECT_NAME}")
 ## SETUP ##
 ###########
 
+# Chimera version
+set(CHIMERA_MAJOR_VERSION "0")
+set(CHIMERA_MINOR_VERSION "1")
+set(CHIMERA_PATCH_VERSION "0")
+set(CHIMERA_VERSION
+  ${CHIMERA_MAJOR_VERSION}.${CHIMERA_MINOR_VERSION}.${CHIMERA_PATCH_VERSION}
+)
+
 # Preset for code formatting
 include(ClangFormat)
 clang_format_setup()
@@ -118,6 +126,13 @@ target_link_libraries(libchimera
 )
 target_link_libraries(libchimera PRIVATE mstch cling_utils)
 target_link_libraries(libchimera PRIVATE chimera_bindings)
+target_compile_definitions(libchimera
+  PUBLIC
+    CHIMERA_MAJOR_VERSION=${CHIMERA_MAJOR_VERSION}
+    CHIMERA_MINOR_VERSION=${CHIMERA_MINOR_VERSION}
+    CHIMERA_PATCH_VERSION=${CHIMERA_PATCH_VERSION}
+    CHIMERA_VERSION=${CHIMERA_VERSION}
+)
 clang_format_add_sources(${${PROJECT_NAME}_HEADERS} ${${PROJECT_NAME}_SOURCES})
 
 # Build the main chimera executable.

src/chimera.cpp

@@ -5,6 +5,7 @@
 #include "chimera/configuration.h"
 #include "chimera/frontend_action.h"
 
+#include <iostream>
 #include <memory>
 #include <string>
 #include <clang/Tooling/ArgumentsAdjusters.h>
@@ -78,6 +79,18 @@ static cl::extrahelp MoreHelp(
 
 int run(int argc, const char **argv)
 {
+    // Print custom output for `--version` option
+    for (int i = 1; i < argc; ++i)
+    {
+        if (std::strcmp(argv[i], "--version") == 0)
+        {
+            std::cout << "Chimera " << CHIMERA_MAJOR_VERSION << "."
+                      << CHIMERA_MINOR_VERSION << "." << CHIMERA_PATCH_VERSION
+                      << "\n\n";
+            exit(0);
+        }
+    }
+
     // Create parser that handles clang options.
     CommonOptionsParser OptionsParser(argc, argv, ChimeraCategory);