Use version agnostic homebrew prefix

- Use version agnostic homebrew prefix
- Recent versions of v8 requires C++ 20
- Accept V8 backend as option from make
- Export compile commands from cmake

Signed-off-by: Balakrishna Avulapati <ba@bavulapati.com>

Author: bavulapati

CMakeLists.txt

@@ -7,7 +7,7 @@ include(vendor/noa/cmake/noa.cmake)
 include(cmake/CompilerOptions.cmake)
 
 # C++ standard
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 
 # Options
 set(INCLUDEJS_BACKEND "JavaScriptCore" CACHE STRING "The IncludeJS Engine backend")

Makefile

@@ -5,7 +5,7 @@ CTEST = ctest
 # Options
 PRESET = Debug
 SHARED = OFF
-BACKEND = JavaScriptCore
+BACKEND ?= JavaScriptCore
 
 all: configure compile test
 
@@ -17,7 +17,8 @@ configure: .always
 		-DINCLUDEJS_ENGINE:BOOL=ON \
 		-DINCLUDEJS_TESTS:BOOL=ON \
 		-DINCLUDEJS_DOCS:BOOL=ON \
-		-DBUILD_SHARED_LIBS:BOOL=$(SHARED)
+		-DBUILD_SHARED_LIBS:BOOL=$(SHARED) \
+		-DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=ON
 
 compile: .always
 	$(CMAKE) --build ./build --config $(PRESET) --target clang_format

cmake/FindV8.cmake

@@ -5,16 +5,15 @@ if(NOT V8_FOUND)
     # Clang, it is unable to find the V8 library and headers which have been
     # downloaded from Homebrew.
     # Refs: https://github.com/Homebrew/homebrew-core/issues/45061#issuecomment-541420664
-    set(V8_VERSION "12.1.285.24")
     if(CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64")
-      set(HOMEBREW_CELLAR "/opt/homebrew/Cellar")
+      set(HOMEBREW_PREFIX "/opt/homebrew/opt/v8")
     elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
-      set(HOMEBREW_CELLAR "/usr/local/Cellar")
+      set(HOMEBREW_PREFIX "/usr/local/opt/v8")
     endif()
     target_include_directories(v8
-      INTERFACE "${HOMEBREW_CELLAR}/v8/${V8_VERSION}/include")
+      INTERFACE "${HOMEBREW_PREFIX}/include")
     target_link_directories(v8
-      INTERFACE "${HOMEBREW_CELLAR}/v8/${V8_VERSION}/lib")
+      INTERFACE "${HOMEBREW_PREFIX}/lib")
     target_link_libraries(v8 INTERFACE "-lv8")
     target_link_libraries(v8 INTERFACE "-lv8_libplatform")
     target_compile_definitions(v8