diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -429,6 +429,15 @@
   XCore
   )
 
+set(LLVM_ALL_EXPERIMENTAL_TARGETS
+  ARC
+  CSKY
+  DirectX
+  LoongArch
+  M68k
+  SPIRV
+)
+
 # List of targets with JIT support:
 set(LLVM_TARGETS_WITH_JIT X86 PowerPC AArch64 ARM Mips SystemZ)
 
@@ -525,6 +534,11 @@
   set( LLVM_TARGETS_TO_BUILD ${LLVM_ALL_TARGETS} )
 endif()
 
+
+if(LLVM_EXPERIMENTAL_TARGETS_TO_BUILD STREQUAL "all" )
+  set(LLVM_EXPERIMENTAL_TARGETS_TO_BUILD ${LLVM_ALL_EXPERIMENTAL_TARGETS})
+endif()
+
 set(LLVM_TARGETS_TO_BUILD
    ${LLVM_TARGETS_TO_BUILD}
    ${LLVM_EXPERIMENTAL_TARGETS_TO_BUILD})