[BOLT] Improve cmake configs for opensource

Summary:
Change cmake config in BOLT to only support Linux. In other
platforms, we print a warning that we won't build BOLT.  Change
configs to determine whether we will build BOLT runtime libs. This
only happens in x86 hosts. If true, we will build the runtime and
enable bolt-runtime tests. New tests that depend on the bolt_rt lib
needs to be marked REQUIRES:bolt-runtime. I updated the relevant
tests.  Fix cmake to do not crash when building llvm with a target
that BOLT does not support.

(cherry picked from FBD31935760)

bolt/CMakeLists.txt

@@ -4,7 +4,32 @@ set(BOLT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 set(BOLT_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
 set(CMAKE_CXX_STANDARD 14)
 
-ExternalProject_Add(bolt_rt
+if (NOT CMAKE_HOST_SYSTEM_NAME MATCHES Linux)
+  message(WARNING "Not building BOLT on unsupported platform")
+else()
+  set(BOLT_ENABLE_RUNTIME OFF)
+  if (CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "x86_64")
+    set(BOLT_ENABLE_RUNTIME ON)
+  endif()
+
+  set(BOLT_INCLUDE_TESTS OFF)
+  if (LLVM_INCLUDE_TESTS)
+    string(FIND "${LLVM_ENABLE_PROJECTS}" "clang" POSITION)
+    if (NOT ${POSITION} EQUAL -1)
+      string(FIND "${LLVM_ENABLE_PROJECTS}" "lld" POSITION)
+      if (NOT ${POSITION} EQUAL -1)
+        set(BOLT_INCLUDE_TESTS ON)
+      else()
+        message(WARNING "Not including BOLT tests since lld is disabled")
+      endif()
+    else()
+      message(WARNING "Not including BOLT tests since clang is disabled")
+    endif()
+  endif()
+
+  if (BOLT_ENABLE_RUNTIME)
+    message(STATUS "Building BOLT runtime libraries for X86")
+    ExternalProject_Add(bolt_rt
       SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/runtime"
       STAMP_DIR ${CMAKE_CURRENT_BINARY_DIR}/bolt_rt-stamps
       BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/bolt_rt-bins
@@ -13,20 +38,21 @@ ExternalProject_Add(bolt_rt
                  -DCMAKE_BUILD_TYPE=Release
                  -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
                  -DCMAKE_INSTALL_PREFIX=${LLVM_BINARY_DIR}
-  # You might want to set this to True if actively developing bolt_rt, otherwise
-  # cmake will not rebuild it after source code changes
       BUILD_ALWAYS True
       )
-
-include_directories( ${BOLT_SOURCE_DIR}/include )
-
-install(CODE "execute_process\(COMMAND \${CMAKE_COMMAND} -DCMAKE_INSTALL_PREFIX=\${CMAKE_INSTALL_PREFIX} -P ${CMAKE_CURRENT_BINARY_DIR}/bolt_rt-bins/cmake_install.cmake \)"
+    install(CODE "execute_process\(COMMAND \${CMAKE_COMMAND} -DCMAKE_INSTALL_PREFIX=\${CMAKE_INSTALL_PREFIX} -P ${CMAKE_CURRENT_BINARY_DIR}/bolt_rt-bins/cmake_install.cmake \)"
       COMPONENT bolt_rt)
-
-add_llvm_install_targets(install-bolt_rt
+    add_llvm_install_targets(install-bolt_rt
       DEPENDS bolt_rt
       COMPONENT bolt_rt)
+  endif()
 
-add_subdirectory(lib)
-add_subdirectory(test)
-add_subdirectory(tools)
+  include_directories( ${BOLT_SOURCE_DIR}/include )
+
+  add_subdirectory(lib)
+  add_subdirectory(tools)
+
+  if (BOLT_INCLUDE_TESTS)
+    add_subdirectory(test)
+  endif()
+endif()

bolt/lib/Target/CMakeLists.txt

@@ -1,4 +1,11 @@
-foreach(t ${LLVM_TARGETS_TO_BUILD})
-  message(STATUS "Targeting llvm-bolt ${t}")
-  add_subdirectory(${t})
-endforeach()
+string(FIND "${LLVM_TARGETS_TO_BUILD}" "X86" POSITION)
+if (NOT ${POSITION} EQUAL -1)
+  message(STATUS "Targeting X86 in llvm-bolt")
+  add_subdirectory(X86)
+endif()
+
+string(FIND "${LLVM_TARGETS_TO_BUILD}" "AArch64" POSITION)
+if (NOT ${POSITION} EQUAL -1)
+  message(STATUS "Targeting AArch64 in llvm-bolt")
+  add_subdirectory(AArch64)
+endif()

bolt/test/CMakeLists.txt

@@ -1,3 +1,7 @@
+llvm_canonicalize_cmake_booleans(
+  BOLT_ENABLE_RUNTIME
+  )
+
 configure_lit_site_cfg(
   ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.py.in
   ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg.py

bolt/test/X86/internal_call_instrument.s

@@ -1,6 +1,6 @@
 # This reproduces a bug with instrumentation crashes on internal call
 
-# REQUIRES: system-linux
+# REQUIRES: system-linux,bolt-runtime
 
 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
 # Delete our BB symbols so BOLT doesn't mark them as entry points

bolt/test/lit.cfg.py

@@ -50,6 +50,9 @@ else:
     lit_config.warning('Setting a timeout per test not supported. ' + errormsg
                        + ' Some tests will be skipped.')
 
+if config.bolt_enable_runtime:
+    config.available_features.add("bolt-runtime")
+
 llvm_config.use_default_substitutions()
 
 llvm_config.use_clang()

bolt/test/lit.site.cfg.py.in

@@ -5,6 +5,7 @@ import sys
 config.llvm_src_root = "@LLVM_SOURCE_DIR@"
 config.llvm_obj_root = "@LLVM_BINARY_DIR@"
 config.bolt_obj_root = "@BOLT_BINARY_DIR@"
+config.bolt_enable_runtime = @BOLT_ENABLE_RUNTIME@
 config.llvm_tools_dir = "@LLVM_TOOLS_DIR@"
 config.llvm_libs_dir = "@LLVM_LIBS_DIR@"
 config.llvm_shlib_dir = "@SHLIBDIR@"

bolt/test/runtime/X86/fdata-escape-chars.ll

@@ -50,7 +50,7 @@ define internal void @static_symb_backslash_b() #0 {
   ret void
 }
 
-; REQUIRES: system-linux
+; REQUIRES: system-linux,bolt-runtime
 
 ; RUN: llc %s -o %t.s
 ; RUN: %clang %cflags -O0 %t.s -o %t.exe -Wl,-q

bolt/test/runtime/X86/instrumentation-dup-jts.s

@@ -42,7 +42,7 @@
 #}
 
 
-# REQUIRES: system-linux
+# REQUIRES: system-linux,bolt-runtime
 
 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
 # RUN:   %s -o %t.o

bolt/test/runtime/X86/instrumentation-ind-calls.s

@@ -6,7 +6,7 @@
 # The solution is to temporarily fix RSP. Check that we correctly instrument
 # these cases.
 
-# REQUIRES: system-linux
+# REQUIRES: system-linux,bolt-runtime
 
 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
 # RUN:   %s -o %t.o

bolt/test/runtime/X86/instrumentation-pie.c

@@ -19,7 +19,7 @@ int main(int argc, char **argv) {
 }
 
 /*
-REQUIRES: system-linux
+REQUIRES: system-linux,bolt-runtime
 
 RUN: %clang %cflags %s -o %t.exe -Wl,-q -pie -fpie
 

bolt/test/runtime/X86/instrumentation-shlib.c

@@ -47,7 +47,7 @@ int main(int argc, char **argv) {
 #endif
 
 /*
-REQUIRES: system-linux
+REQUIRES: system-linux,bolt-runtime
 
 RUN: %clang %cflags %s -o %t.so -Wl,-q -fpie -fPIC -shared -DLIB
 RUN: %clang %cflags %s -o %t.exe -Wl,-q -ldl

bolt/test/runtime/X86/internal_call_instrument.test

@@ -1,6 +1,6 @@
 # Verify that instrumentation pass handles internal calls
 
-REQUIRES: x86_64-linux
+REQUIRES: x86_64-linux,bolt-runtime
 
 RUN: %clang -O3 %S/Inputs/internalcall-main.c %S/Inputs/internalcall.S -Wl,-q \
 RUN:   -o %t.exe

bolt/test/runtime/X86/user-func-reorder.c

@@ -25,7 +25,7 @@ int main(int argc, char **argv) {
 }
 
 /*
-REQUIRES: system-linux
+REQUIRES: system-linux,bolt-runtime
 
 RUN: %clang %cflags %s -o %t.exe -Wl,-q
 

bolt/tools/driver/CMakeLists.txt

@@ -8,11 +8,17 @@ set(LLVM_LINK_COMPONENTS
   Support
   )
 
+if (BOLT_ENABLE_RUNTIME)
+  set(BOLT_DRIVER_DEPS "bolt_rt")
+else()
+  set(BOLT_DRIVER_DEPS "")
+endif()
+
 add_llvm_tool(llvm-bolt
   llvm-bolt.cpp
 
   DEPENDS
-  bolt_rt
+  ${BOLT_DRIVER_DEPS}
   )
 
 add_llvm_tool_symlink(perf2bolt llvm-bolt)