Print HERMES_RELEASE_VERSION in version string.

Summary:
Add a preprocessor define for the `HERMES_RELEASE_VERSION` string,
which the `printHermesVersion` function uses to print the
Hermes release version.

Reviewed By: willholen

Differential Revision: D16224555

fbshipit-source-id: c583cedb88eee1f22957d78c3a8c6793e902c158

CMakeLists.txt

@@ -15,6 +15,10 @@ endif()
 include(CheckCXXCompilerFlag)
 include(CheckCXXSourceCompiles)
 
+# This must be consistent with the release_version in
+# android/build.gradle and npm/package.json
+set(HERMES_RELEASE_VERSION 0.1.0)
+
 # Project options.
 set(HERMESVM_GCKIND NONCONTIG_GENERATIONAL
   CACHE STRING
@@ -160,6 +164,9 @@ endif()
 
 set(DEFAULT_GCCELL_ID $<$<CONFIG:Debug>:ON>$<$<NOT:$<CONFIG:Debug>>:OFF>)
 
+# Make the HERMES_RELEASE_VERSION accessible for version printing in C++.
+add_definitions(-DHERMES_RELEASE_VERSION="${HERMES_RELEASE_VERSION}")
+
 add_definitions(-DHERMESVM_GC_${HERMESVM_GCKIND})
 if(HERMESVM_GC_GENERATIONAL_MARKSWEEPCOMPACT)
     add_definitions(-DHERMESVM_GC_GENERATIONAL_MARKSWEEPCOMPACT)
@@ -500,10 +507,6 @@ set_target_properties(check-hermes PROPERTIES FOLDER "Hermes regression tests")
 
 # This is how github release files are built.
 
-# This must be consistent with the release_version in
-# android/build.gradle and npm/package.json
-set(HERMES_RELEASE_VERSION 0.1.0)
-
 set(HERMES_GITHUB_DIR ${HERMES_BINARY_DIR}/github)
 string(TOLOWER ${CMAKE_SYSTEM_NAME} HERMES_GITHUB_SYSTEM_NAME)
 set(HERMES_CLI_GITHUB_FILE hermes-cli-${HERMES_GITHUB_SYSTEM_NAME}-v${HERMES_RELEASE_VERSION}.tar.gz)

lib/CompilerDriver/CompilerDriver.cpp

@@ -1664,6 +1664,9 @@ void printHermesVersion(
     const char *vmStr = "",
     bool features = true) {
   s << "Hermes JavaScript compiler" << vmStr << ".\n"
+#ifdef HERMES_RELEASE_VERSION
+    << "  Hermes release version: " << HERMES_RELEASE_VERSION << "\n"
+#endif
     << "  HBC bytecode version: " << hermes::hbc::BYTECODE_VERSION << "\n"
     << "\n";
   if (features) {