[PATCH] D17452: [CMake] Add partial support for MSVC in compiler-rt builtins

[Roman Shirokiy via cfe-commits]

roman.shirokiy created this revision.
roman.shirokiy added reviewers: rnk, majnemer, beanz, pcc.
roman.shirokiy added a subscriber: cfe-commits.

This enables MSVC build of complex number arithmetic compiler-rt builtins. 

Consider Clang which is built under native Windows environment.  Compiling the following code will result in "unresolved external symbol __divsc3 referenced in function main" 

int main(){
  float _Complex a, b, c;
  c = a / b;
  return 0;
}

Clang front-end generates calls to complex number arithmetic functions, which are nowhere to be found in Microsoft runtime libs. The idea of this patch is to enable MSVC build of compiler-rt builtins library with certain subset of ported-to-CL sources and link this lib in case if user has explicitly demanded so through "--rtlib" option. This will allow to compile code with usage of complex number arithmetic in general and spec2006/462.libquantum in particular.




http://reviews.llvm.org/D17452

Files:
  CMakeLists.txt
  lib/builtins/CMakeLists.txt

Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -241,6 +241,8 @@
   # FIXME: In fact, sanitizers should support both /MT and /MD, see PR20214.
   if(COMPILER_RT_HAS_MT_FLAG)
     foreach(flag_var
+      CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
+      CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
       CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
       CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
       string(REGEX REPLACE "/M[DT]d" "/MT" ${flag_var} "${${flag_var}}")
Index: lib/builtins/CMakeLists.txt
===================================================================
--- lib/builtins/CMakeLists.txt
+++ lib/builtins/CMakeLists.txt
@@ -143,6 +143,15 @@
   umodsi3.c
   umodti3.c)
 
+set(MSVC_SOURCES
+ divsc3.c
+ divdc3.c
+ divxc3.c
+ mulsc3.c
+ muldc3.c
+ mulxc3.c)
+
+
 if(APPLE)
   set(GENERIC_SOURCES
     ${GENERIC_SOURCES}
@@ -216,14 +225,15 @@
       ${i386_SOURCES})
 else () # MSVC
   # Use C versions of functions when building on MSVC
-  # MSVC's assembler takes Intel syntax, not AT&T syntax
+  # MSVC's assembler takes Intel syntax, not AT&T syntax.
+  # Also use only MSVC compilable builtin implementations.
   set(x86_64_SOURCES
       x86_64/floatdidf.c
       x86_64/floatdisf.c
       x86_64/floatdixf.c
-      ${GENERIC_SOURCES})
+      ${MSVC_SOURCES})
   set(x86_64h_SOURCES ${x86_64_SOURCES})
-  set(i386_SOURCES ${GENERIC_SOURCES})
+  set(i386_SOURCES ${MSVC_SOURCES})
   set(i686_SOURCES ${i386_SOURCES})
 endif () # if (NOT MSVC)
 
@@ -363,7 +373,7 @@
   add_subdirectory(Darwin-excludes)
   add_subdirectory(macho_embedded)
   darwin_add_builtin_libraries(${BUILTIN_SUPPORTED_OS})
-elseif (NOT WIN32 OR MINGW)
+else ()
   append_string_if(COMPILER_RT_HAS_STD_C99_FLAG -std=c99 maybe_stdc99)
 
   foreach (arch ${BUILTIN_SUPPORTED_ARCH})


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