[compiler-rt] Pass sysroot and disable pedantic for crtbegin.o/crtend.o

[phosek]

Summary

These are needed to make bots happy.

[mcgrathr]

Lgtm

[MaskRay]

The -Wno-pedantic doesn't seem to apply on crtbegin.o so I committed rCTE359655 to suppress the pendantic warnings.

compiler-rt/trunk/cmake/Modules/AddCompilerRT.cmake

if(CMAKE_CONFIGURATION_TYPES AND LIB_PARENT_TARGET)
       set(COMPONENT_OPTION COMPONENT ${LIB_PARENT_TARGET})
     else()
       set(COMPONENT_OPTION COMPONENT ${libname})
     endif()
 
     if(type STREQUAL "OBJECT")
       get_property(cflags_${libname} SOURCE ${sources_${libname}} PROPERTY COMPILE_FLAGS)
       if(CMAKE_C_COMPILER_ID MATCHES Clang AND CMAKE_C_COMPILER_TARGET)
-        list(APPEND cflags_${libname} "-target ${CMAKE_C_COMPILER_TARGET}")
+        list(APPEND cflags_${libname} "--target=${CMAKE_C_COMPILER_TARGET}")
+      endif()
+      if(CMAKE_SYSROOT)
+        list(APPEND cflags_${libname} "--sysroot=${CMAKE_SYSROOT}")
       endif()
       string(REPLACE ";" " " extra_cflags_${libname} "${extra_cflags_${libname}}")
       string(REGEX MATCHALL "<[A-Za-z0-9_]*>" substitutions
              ${CMAKE_C_COMPILE_OBJECT})
       set(compile_command_${libname} "${CMAKE_C_COMPILE_OBJECT}")
       set(output_file_${libname} ${output_name_${libname}}${CMAKE_C_OUTPUT_EXTENSION})
       foreach(substitution ${substitutions})
         if(substitution STREQUAL "<CMAKE_C_COMPILER>")

compiler-rt/trunk/cmake/config-ix.cmake

 check_cxx_compiler_flag("-Werror -Wframe-larger-than=512" COMPILER_RT_HAS_WFRAME_LARGER_THAN_FLAG)
 check_cxx_compiler_flag("-Werror -Wglobal-constructors"   COMPILER_RT_HAS_WGLOBAL_CONSTRUCTORS_FLAG)
 check_cxx_compiler_flag("-Werror -Wc99-extensions"     COMPILER_RT_HAS_WC99_EXTENSIONS_FLAG)
 check_cxx_compiler_flag("-Werror -Wgnu"                COMPILER_RT_HAS_WGNU_FLAG)
 check_cxx_compiler_flag("-Werror -Wnon-virtual-dtor"   COMPILER_RT_HAS_WNON_VIRTUAL_DTOR_FLAG)
 check_cxx_compiler_flag("-Werror -Wvariadic-macros"    COMPILER_RT_HAS_WVARIADIC_MACROS_FLAG)
 check_cxx_compiler_flag("-Werror -Wunused-parameter"   COMPILER_RT_HAS_WUNUSED_PARAMETER_FLAG)
 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" COMPILER_RT_HAS_WCOVERED_SWITCH_DEFAULT_FLAG)
+check_cxx_compiler_flag(-Wno-pedantic COMPILER_RT_HAS_WNO_PEDANTIC)
 
 check_cxx_compiler_flag(/W4 COMPILER_RT_HAS_W4_FLAG)
 check_cxx_compiler_flag(/WX COMPILER_RT_HAS_WX_FLAG)
 check_cxx_compiler_flag(/wd4146 COMPILER_RT_HAS_WD4146_FLAG)
 check_cxx_compiler_flag(/wd4291 COMPILER_RT_HAS_WD4291_FLAG)
 check_cxx_compiler_flag(/wd4221 COMPILER_RT_HAS_WD4221_FLAG)
 check_cxx_compiler_flag(/wd4391 COMPILER_RT_HAS_WD4391_FLAG)
 check_cxx_compiler_flag(/wd4722 COMPILER_RT_HAS_WD4722_FLAG)

compiler-rt/trunk/lib/crt/CMakeLists.txt

function(check_cxx_section_exists section output)
   file(REMOVE_RECURSE ${TARGET_NAME})
 endfunction()
 
 check_cxx_section_exists(".init_array" COMPILER_RT_HAS_INITFINI_ARRAY
   SOURCE "__attribute__((constructor)) void f() {}\nint main() { return 0; }\n")
 
 append_list_if(COMPILER_RT_HAS_INITFINI_ARRAY -DCRT_HAS_INITFINI_ARRAY CRT_CFLAGS)
 append_list_if(COMPILER_RT_HAS_FPIC_FLAG -fPIC CRT_CFLAGS)
+append_list_if(COMPILER_RT_HAS_NO_PEDANTIC -Wno-pedantic CRT_CFLAGS)
 
 foreach(arch ${CRT_SUPPORTED_ARCH})
   add_compiler_rt_runtime(clang_rt.crtbegin
     OBJECT
     ARCHS ${arch}
     SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtbegin.c
     CFLAGS ${CRT_CFLAGS}
     PARENT_TARGET crt)
   add_compiler_rt_runtime(clang_rt.crtend
     OBJECT
     ARCHS ${arch}
     SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtend.c
     CFLAGS ${CRT_CFLAGS}
     PARENT_TARGET crt)
 endforeach()