[builtins] Prevent duplicate definitions for overridden functions

Summary:
Some architecture-specific function overrides (for example, i386/ashrdi3.S)
duplicate generic functions (in that case, ashrdi3.c). Prevent duplicate definitions
by filtering out the generic files before compiling.

Reviewers: compnerd, beanz

Subscribers: llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D37166

llvm-svn: 312140
GitOrigin-RevId: e3b018f6e5fc1f8558d3eb060184f42290d05cb0

cmake/Modules/CompilerRTDarwinUtils.cmake

diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
index f646975..7fdb111 100644
--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
+++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
@@ -243,35 +243,6 @@
   endif()
 endfunction()
 
-# Filter out generic versions of routines that are re-implemented in
-# architecture specific manner.  This prevents multiple definitions of the
-# same symbols, making the symbol selection non-deterministic.
-function(darwin_filter_builtin_sources output_var exclude_or_include excluded_list)
-  if(exclude_or_include STREQUAL "EXCLUDE")
-    set(filter_action GREATER)
-    set(filter_value -1)
-  elseif(exclude_or_include STREQUAL "INCLUDE")
-    set(filter_action LESS)
-    set(filter_value 0)
-  else()
-    message(FATAL_ERROR "darwin_filter_builtin_sources called without EXCLUDE|INCLUDE")
-  endif()
-
-  set(intermediate ${ARGN})
-  foreach (_file ${intermediate})
-    get_filename_component(_name_we ${_file} NAME_WE)
-    list(FIND ${excluded_list} ${_name_we} _found)
-    if(_found ${filter_action} ${filter_value})
-      list(REMOVE_ITEM intermediate ${_file})
-    elseif(${_file} MATCHES ".*/.*\\.S" OR ${_file} MATCHES ".*/.*\\.c")
-      get_filename_component(_name ${_file} NAME)
-      string(REPLACE ".S" ".c" _cname "${_name}")
-      list(REMOVE_ITEM intermediate ${_cname})
-    endif ()
-  endforeach ()
-  set(${output_var} ${intermediate} PARENT_SCOPE)
-endfunction()
-
 # Generates builtin libraries for all operating systems specified in ARGN. Each
 # OS library is constructed by lipo-ing together single-architecture libraries.
 macro(darwin_add_builtin_libraries)
@@ -294,7 +265,7 @@
                               ARCH ${arch}
                               MIN_VERSION ${DARWIN_${os}_BUILTIN_MIN_VER})
 
-      darwin_filter_builtin_sources(filtered_sources
+      filter_builtin_sources(filtered_sources
         EXCLUDE ${arch}_${os}_EXCLUDED_BUILTINS
         ${${arch}_SOURCES})
 
@@ -316,7 +287,7 @@
                               OS ${os}
                               ARCH ${arch})
 
-        darwin_filter_builtin_sources(filtered_sources
+        filter_builtin_sources(filtered_sources
           EXCLUDE ${arch}_${os}_EXCLUDED_BUILTINS
           ${${arch}_SOURCES})
 
@@ -411,7 +382,7 @@
     set(x86_64_FUNCTIONS ${common_FUNCTIONS})
 
     foreach(arch ${DARWIN_macho_embedded_ARCHS})
-      darwin_filter_builtin_sources(${arch}_filtered_sources
+      filter_builtin_sources(${arch}_filtered_sources
         INCLUDE ${arch}_FUNCTIONS
         ${${arch}_SOURCES})
       if(NOT ${arch}_filtered_sources)

cmake/Modules/CompilerRTUtils.cmake

diff --git a/cmake/Modules/CompilerRTUtils.cmake b/cmake/Modules/CompilerRTUtils.cmake
index 36df49f..63b2252 100644
--- a/cmake/Modules/CompilerRTUtils.cmake
+++ b/cmake/Modules/CompilerRTUtils.cmake
@@ -270,3 +270,32 @@
     set(COMPILER_RT_HAS_EXPLICIT_DEFAULT_TARGET_TRIPLE FALSE)
   endif()
 endmacro()
+
+# Filter out generic versions of routines that are re-implemented in
+# architecture specific manner.  This prevents multiple definitions of the
+# same symbols, making the symbol selection non-deterministic.
+function(filter_builtin_sources output_var exclude_or_include excluded_list)
+  if(exclude_or_include STREQUAL "EXCLUDE")
+    set(filter_action GREATER)
+    set(filter_value -1)
+  elseif(exclude_or_include STREQUAL "INCLUDE")
+    set(filter_action LESS)
+    set(filter_value 0)
+  else()
+    message(FATAL_ERROR "filter_builtin_sources called without EXCLUDE|INCLUDE")
+  endif()
+
+  set(intermediate ${ARGN})
+  foreach (_file ${intermediate})
+    get_filename_component(_name_we ${_file} NAME_WE)
+    list(FIND ${excluded_list} ${_name_we} _found)
+    if(_found ${filter_action} ${filter_value})
+      list(REMOVE_ITEM intermediate ${_file})
+    elseif(${_file} MATCHES ".*/.*\\.S" OR ${_file} MATCHES ".*/.*\\.c")
+      get_filename_component(_name ${_file} NAME)
+      string(REPLACE ".S" ".c" _cname "${_name}")
+      list(REMOVE_ITEM intermediate ${_cname})
+    endif ()
+  endforeach ()
+  set(${output_var} ${intermediate} PARENT_SCOPE)
+endfunction()

lib/builtins/CMakeLists.txt

diff --git a/lib/builtins/CMakeLists.txt b/lib/builtins/CMakeLists.txt
index 650e9f9..6128abc 100644
--- a/lib/builtins/CMakeLists.txt
+++ b/lib/builtins/CMakeLists.txt
@@ -235,8 +235,8 @@
       x86_64/floatdixf.c
       x86_64/floatundidf.S
       x86_64/floatundisf.S
-      x86_64/floatundixf.S
-      ${GENERIC_SOURCES})
+      x86_64/floatundixf.S)
+  filter_builtin_sources(x86_64_SOURCES EXCLUDE x86_64_SOURCES "${x86_64_SOURCES};${GENERIC_SOURCES}")
   set(x86_64h_SOURCES ${x86_64_SOURCES})
 
   if (WIN32)
@@ -262,8 +262,8 @@
       i386/moddi3.S
       i386/muldi3.S
       i386/udivdi3.S
-      i386/umoddi3.S
-      ${GENERIC_SOURCES})
+      i386/umoddi3.S)
+  filter_builtin_sources(i386_SOURCES EXCLUDE i386_SOURCES "${i386_SOURCES};${GENERIC_SOURCES}")
 
   if (WIN32)
     set(i386_SOURCES
@@ -315,8 +315,8 @@
   arm/sync_fetch_and_xor_8.S
   arm/udivmodsi4.S
   arm/udivsi3.S
-  arm/umodsi3.S
-  ${GENERIC_SOURCES})
+  arm/umodsi3.S)
+filter_builtin_sources(arm_SOURCES EXCLUDE arm_SOURCES "${arm_SOURCES};${GENERIC_SOURCES}")
 
 set(thumb1_SOURCES
   arm/divsi3.S