Build static llvm tool binaries.

Previously, the binaries built when ENABLE_TOOL=LLVM are all
dynamically linked, there are many .so dependencies that prevent the
tool binaries from be deployed to other systems.

The change is also required when building release binaries.

CMakeLists.txt

@@ -3,6 +3,7 @@ set(CMAKE_CXX_STANDARD 17)
 set(ABSL_PROPAGATE_CXX_STD on)
 
 project(autofdo)
+set (Protobuf_USE_STATIC_LIBS TRUE)
 
 function (execute_perf_protobuf)
 
@@ -150,6 +151,11 @@ function (build_llvm)
      endif()
   endif()
 
+  # Build static binaries.
+  set (BUILD_SHARED_LIBS OFF)
+  set (WITH_GFLAGS OFF)
+  set (WITH_UNWIND OFF)
+
   ### LLVM Configuration
   set (LLVM_INCLUDE_UTILS OFF)
   set (LLVM_INCLUDE_TESTS OFF)
@@ -162,6 +168,10 @@ function (build_llvm)
   set (LLVM_TARGETS_TO_BUILD X86 AArch64 CACHE STRING
     "Semicolon-separated list of LLVM targets to build, or \"all\".")
   set (LLVM_ENABLE_ZSTD FORCE_ON)
+  set (LLVM_USE_STATIC_ZSTD TRUE CACHE BOOL "use static zstd" FORCE)
+  set (LLVM_ENABLE_ZLIB OFF CACHE BOOL "turn off zlib" FORCE)
+  # terminfo is not needed by create_llvm_prof
+  set (LLVM_ENABLE_TERMINFO OFF CACHE BOOL "disable terminfo" FORCE)
   ###
 
   add_subdirectory(third_party/abseil)
@@ -361,8 +371,9 @@ function (build_llvm)
     LLVMSupport)
   add_test(NAME symbol_map_test COMMAND symbol_map_test)
 
-  find_library (LIBELF_LIBRARIES NAMES elf REQUIRED)
-  find_library (LIBCRYPTO_LIBRARIES NAMES crypto REQUIRED)
+  find_library (LIBELF_LIBRARIES NAMES libelf.a REQUIRED)
+  find_library (LIBZ_LIBRARIES NAMES libz.a REQUIRED)
+  find_library (LIBCRYPTO_LIBRARIES NAMES libcrypto.a REQUIRED)
 
   add_executable(llvm_profile_reader_test llvm_profile_reader_test.cc)
   target_link_libraries(llvm_profile_reader_test
@@ -779,7 +790,7 @@ function (build_llvm)
     third_party/perf_data_converter/src/quipper
     ${PROJECT_BINARY_DIR}/third_party/perf_data_converter/src/quipper)
   target_link_libraries(quipper_perf
-    perf_proto ${LIBELF_LIBRARIES} ${LIBCRYPTO_LIBRARIES})
+    perf_proto ${LIBELF_LIBRARIES} ${LIBZ_LIBRARIES} ${LIBCRYPTO_LIBRARIES})
 
   add_custom_command(PRE_BUILD
     OUTPUT prepare_cmds