LLVM patch: don't pass -static when building executables

This is problematic when targeting *-linux-gnu* and *-macos-none because Zig
doesn't provide a static libc for these, resulting in early configure errors.
Just rely on the Zig compiler to infer the executable link mode from the link
inputs instead.

Author: alexrp

README.md

@@ -31,6 +31,7 @@ For other versions, check the git tags of this repository.
  * all: Deleted unused files.
  * LLVM: Support .lib extension for static zstd.
  * LLVM: Portable handling of .def linker flag
+ * LLVM: Don't pass -static when building executables.
  * Clang: Ignore the examples directory
  * Clang: Disable building of libclang-cpp.so.
  * LLD: Added additional include directory to Zig's libunwind.

llvm/CMakeLists.txt

@@ -932,7 +932,6 @@ if(NOT LLVM_INDIVIDUAL_TEST_COVERAGE)
 endif()
 
 if (LLVM_BUILD_STATIC)
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")
   # Remove shared library suffixes from use in find_library
   foreach (shared_lib_suffix ${CMAKE_SHARED_LIBRARY_SUFFIX} ${CMAKE_IMPORT_LIBRARY_SUFFIX})
     list(FIND CMAKE_FIND_LIBRARY_SUFFIXES ${shared_lib_suffix} shared_lib_suffix_idx)