[flang][driver] restore flang-new as symlink

Restore flang-new as a symlink to flang for backwards compatibility

Co-authored-by: H. Vetinari <h.vetinari@gmx.com>
Co-authored-by: Andrzej Warzynski <andrzej.warzynski@arm.com>

clang/lib/Driver/ToolChain.cpp

@@ -381,6 +381,9 @@ static const DriverSuffix *FindDriverSuffix(StringRef ProgName, size_t &Pos) {
       {"cl", "--driver-mode=cl"},
       {"++", "--driver-mode=g++"},
       {"flang", "--driver-mode=flang"},
+      // For backwards compatibility, we create a symlink for `flang` called
+      // `flang-new`. This will be removed in the future.
+      {"flang-new", "--driver-mode=flang"},
       {"clang-dxc", "--driver-mode=dxc"},
   };
 

flang/tools/flang-driver/CMakeLists.txt

@@ -36,3 +36,7 @@ if(FLANG_PLUGIN_SUPPORT)
 endif()
 
 install(TARGETS flang DESTINATION "${CMAKE_INSTALL_BINDIR}")
+
+# Keep "flang-new" as a symlink for backwards compatiblity. Remove once "flang"
+# is a widely adopted name.
+add_flang_symlink(flang-new flang)

flang/tools/flang-driver/driver.cpp

@@ -88,7 +88,8 @@ int main(int argc, const char **argv) {
   llvm::InitLLVM x(argc, argv);
   llvm::SmallVector<const char *, 256> args(argv, argv + argc);
 
-  clang::driver::ParsedClangName targetandMode("flang", "--driver-mode=flang");
+  clang::driver::ParsedClangName targetandMode =
+      clang::driver::ToolChain::getTargetAndModeFromProgramName(argv[0]);
   std::string driverPath = getExecutablePath(args[0]);
 
   llvm::BumpPtrAllocator a;