Check for invalid projects passed in LLVM_ENABLE_PROJECTS

This is catching misconfiguration. For example one of my automation
had a typo running `-DLLVM_ENABLE_PROJECTS=nlir` and it was just
silently ignored. Instead, an error will now be displayed.

Differential Revision: https://reviews.llvm.org/D110016

diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index c48f506..0200cca 100644 (file)
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -68,9 +68,15 @@ set(LLVM_ALL_PROJECTS "clang;clang-tools-extra;compiler-rt;cross-project-tests;l
 # The flang project is not yet part of "all" projects (see C++ requirements)
 set(LLVM_EXTRA_PROJECTS "flang")
 # List of all known projects in the mono repo
-set(LLVM_KNOWN_PROJECTS "${LLVM_ALL_PROJECTS};${LLVM_EXTRA_PROJECTS}")
+set(LLVM_KNOWN_PROJECTS "${LLVM_ALL_PROJECTS};${LLVM_EXTRA_PROJECTS};llvm")
 set(LLVM_ENABLE_PROJECTS "" CACHE STRING
        "Semicolon-separated list of projects to build (${LLVM_KNOWN_PROJECTS}), or \"all\".")
+foreach(proj ${LLVM_ENABLE_PROJECTS})
+  if (NOT "${proj}" IN_LIST LLVM_KNOWN_PROJECTS)
+     MESSAGE(FATAL_ERROR "${proj} isn't a know project: ${LLVM_KNOWN_PROJECTS}")
+  endif()
+endforeach()
+
 if( LLVM_ENABLE_PROJECTS STREQUAL "all" )
   set( LLVM_ENABLE_PROJECTS ${LLVM_ALL_PROJECTS})
 endif()