[CMake] Fix MIPSr6 build for compiler-rt

[wzssyqa]

Summary

The current version pass -mips64r2 or -mips32r2 options,
which make it failed to build on r6 platform.

In this patch: we detect whether we are MIPSr6 by

_MIPS_ARCH_MIPS32R6/_MIPS_ARCH_MIPS64R6

The out and install path is set to the default triple instead of
hardcoded one, since the clang ask for it.

[MaskRay]

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

221

Just delete commented-out code?

[wzssyqa]

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

221

Done.

keep the comment about N32.

compiler-rt/CMakeLists.txt

 
 construct_compiler_rt_default_triple()
 if ("${COMPILER_RT_DEFAULT_TARGET_TRIPLE}" MATCHES ".*hf$")
   if (${COMPILER_RT_DEFAULT_TARGET_ARCH} MATCHES "^arm")
     set(COMPILER_RT_DEFAULT_TARGET_ARCH "armhf")
     CHECK_SYMBOL_EXISTS (__thumb__ "" COMPILER_RT_ARM_THUMB)
   endif()
 endif()
+if (${COMPILER_RT_DEFAULT_TARGET_ARCH} MATCHES "^mips")
+  CHECK_SYMBOL_EXISTS (_MIPS_ARCH_MIPS32R6 "" COMPILER_RT_MIPS32R6)
+  CHECK_SYMBOL_EXISTS (_MIPS_ARCH_MIPS64R6 "" COMPILER_RT_MIPS64R6)
+  CHECK_SYMBOL_EXISTS (__mips64 "" COMPILER_RT_MIPS_64)
+  CHECK_SYMBOL_EXISTS (__MIPSEL__ "" COMPILER_RT_MIPS_EL)
+  if ("${COMPILER_RT_MIPS_64}")
+    set(COMPILER_RT_DEFAULT_TARGET_ARCH "mips64")
+  else()
+    set(COMPILER_RT_DEFAULT_TARGET_ARCH "mips")
+  endif()
+  if ("${COMPILER_RT_MIPS_EL}")
+    set(COMPILER_RT_DEFAULT_TARGET_ARCH "${COMPILER_RT_DEFAULT_TARGET_ARCH}el")
+  endif()
+endif()
 if ("${COMPILER_RT_DEFAULT_TARGET_TRIPLE}" MATCHES ".*android.*")
   set(ANDROID 1)
   string(REGEX MATCH "-target(=| +)[^ ]+android[a-z]*([0-9]+)" ANDROID_API_LEVEL "${CMAKE_C_FLAGS}")
   set(ANDROID_API_LEVEL ${CMAKE_MATCH_2})
 endif()
 pythonize_bool(ANDROID)
 
 set(COMPILER_RT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})

compiler-rt/cmake/Modules/CompilerRTUtils.cmake

foreach(_file ${intermediate})
     endif()
   endforeach()
   set(${inout_var} ${intermediate} PARENT_SCOPE)
 endfunction()
 
 function(get_compiler_rt_target arch variable)
   string(FIND ${COMPILER_RT_DEFAULT_TARGET_TRIPLE} "-" dash_index)
   string(SUBSTRING ${COMPILER_RT_DEFAULT_TARGET_TRIPLE} ${dash_index} -1 triple_suffix)
+  string(SUBSTRING ${COMPILER_RT_DEFAULT_TARGET_TRIPLE} 0 ${dash_index} triple_cpu)
   if(COMPILER_RT_DEFAULT_TARGET_ONLY)
     # Use exact spelling when building only for the target specified to CMake.
     set(target "${COMPILER_RT_DEFAULT_TARGET_TRIPLE}")
   elseif(ANDROID AND ${arch} STREQUAL "i386")
     set(target "i686${triple_suffix}")
   elseif(${arch} STREQUAL "amd64")
     set(target "x86_64${triple_suffix}")
   elseif(${arch} STREQUAL "sparc64")
     set(target "sparcv9${triple_suffix}")
+  elseif("${arch}" MATCHES "mips64|mips64el")
+    string(REGEX REPLACE "-gnu.*" "-gnuabi64" triple_suffix_gnu "${triple_suffix}")
+    string(REGEX REPLACE "mipsisa32" "mipsisa64" triple_cpu_mips "${triple_cpu}")
+    string(REGEX REPLACE "^mips$" "mips64" triple_cpu_mips "${triple_cpu_mips}")
+    string(REGEX REPLACE "^mipsel$" "mips64el" triple_cpu_mips "${triple_cpu_mips}")
+    set(target "${triple_cpu_mips}${triple_suffix_gnu}")
+  elseif("${arch}" MATCHES "mips|mipsel")
+    string(REGEX REPLACE "-gnuabi.*" "-gnu" triple_suffix_gnu "${triple_suffix}")
+    string(REGEX REPLACE "mipsisa64" "mipsisa32" triple_cpu_mips "${triple_cpu}")
+    string(REGEX REPLACE "mips64" "mips" triple_cpu_mips "${triple_cpu_mips}")
+    set(target "${triple_cpu_mips}${triple_suffix_gnu}")
   else()
     set(target "${arch}${triple_suffix}")
   endif()
   set(${variable} ${target} PARENT_SCOPE)
 endfunction()
 
 function(get_compiler_rt_install_dir arch install_dir)
   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)

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

elseif(NOT APPLE) # Supported archs for Apple platforms are generated later
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "powerpc")
       test_target_arch(powerpc "" "-m32")
       test_target_arch(powerpc64 "" "-m64")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "s390x")
       test_target_arch(s390x "" "")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "sparc")
       test_target_arch(sparc "" "-m32")
       test_target_arch(sparcv9 "" "-m64")
-    elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "mipsel|mips64el")
-      # Gcc doesn't accept -m32/-m64 so we do the next best thing and use
-      # -mips32r2/-mips64r2. We don't use -mips1/-mips3 because we want to match
-      # clang's default CPU's. In the 64-bit case, we must also specify the ABI
-      # since the default ABI differs between gcc and clang.
+    elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "mips")
       # FIXME: Ideally, we would build the N32 library too.
+      if("${COMPILER_RT_MIPS_EL}" AND ("${COMPILER_RT_MIPS32R6}" OR "${COMPILER_RT_MIPS64R6}"))
+        test_target_arch(mipsel "" "-mips32r6" "-mabi=32" "-D_LARGEFILE_SOURCE" "-D_FILE_OFFSET_BITS=64")
+        test_target_arch(mips64el "" "-mips64r6" "-mabi=64")
+      elseif("${COMPILER_RT_MIPS_EL}")
         test_target_arch(mipsel "" "-mips32r2" "-mabi=32" "-D_LARGEFILE_SOURCE" "-D_FILE_OFFSET_BITS=64")
         test_target_arch(mips64el "" "-mips64r2" "-mabi=64")
-    elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "mips")
+      elseif("${COMPILER_RT_MIPS32R6}" OR "${COMPILER_RT_MIPS64R6}")
+        test_target_arch(mips "" "-mips32r6" "-mabi=32" "-D_LARGEFILE_SOURCE" "-D_FILE_OFFSET_BITS=64")
+        test_target_arch(mips64 "" "-mips64r6" "-mabi=64")
+      else()
         test_target_arch(mips "" "-mips32r2" "-mabi=32" "-D_LARGEFILE_SOURCE" "-D_FILE_OFFSET_BITS=64")
         test_target_arch(mips64 "" "-mips64r2" "-mabi=64")
+      endif()
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "arm")
       if(WIN32)
         test_target_arch(arm "" "" "")
       else()
         test_target_arch(arm "" "-march=armv7-a" "-mfloat-abi=soft")
         test_target_arch(armhf "" "-march=armv7-a" "-mfloat-abi=hard")
         test_target_arch(armv6m "" "-march=armv6m" "-mfloat-abi=soft")
       endif()