Replace embedded libgc with Unity fork of recent Boehm (bdwgc) (#16832)

* Initial commit to migrate libgc to bdwgc.

* Fix submodule url

* Don't force Boehm as runtime wrapper. Was just for testing locally.

* Build bdwgc as single object file. Helps with performance.

* Bump bdwgc submodule.

* Attempt to fix windows MSVC based build.

* Remove any references to GC_INSIDE_DLL as we manually managed threads on Windows.

* Allow building boehm on Windows amd64.

* Allow building boehm with msvc.

* Bump bdwgc to fix line endings

* Use LF for sh, am, m4, and ac files in bdwgc

* Bump bdwgc & libatomic_ops with fix for cygwin

* Bump bdwgc to fix mono-boehm being generated as libtool wrapper script.

* Link the static boehm library.

* Revert "Link the static boehm library."

This reverts commit 1f90d81d08308a61c890743cd79d8f6bb791bc99.

* Use --export-all-symbols on cygwin/mingw to fix issues with boehm causing mono symbols not to be exported.

* Fix

1 files changed, 3 insertions, 120 deletions

diff --git a/msvc/libgc.targets.filters b/msvc/libgc.targets.filters
index 8f1ec7d4c51..085b58efe16 100644
--- a/msvc/libgc.targets.filters
+++ b/msvc/libgc.targets.filters
@@ -1,134 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="libmonogc_la_sources">
-    <ClCompile Include="$(MonoSourceLocation)\libgc\allchblk.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\alloc.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\blacklst.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\checksums.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\dbg_mlc.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\dyn_load.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\finalize.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\gc_dlopen.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\gcj_mlc.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\headers.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\malloc.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\mallocx.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\mark.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\mark_rts.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\misc.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\new_hblk.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\obj_map.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\os_dep.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\pcr_interface.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\ptr_chck.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\real_malloc.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\reclaim.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\solaris_pthreads.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\solaris_threads.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\specific.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\stubborn.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\typd_mlc.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\backgraph.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\win32_threads.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\pthread_support.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\pthread_stop_world.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\darwin_stop_world.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\openbsd_stop_world.c">
-      <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
-    </ClCompile>
-    <ClCompile Include="$(MonoSourceLocation)\libgc\mach_dep.c">
+    <ClCompile Include="$(MonoSourceLocation)\external\bdwgc\extra\gc.c">
       <Filter>Source Files$(GCboehmFilterSubFolder)</Filter>
     </ClCompile>
   </ItemGroup>
   <ItemGroup>
-    <ClInclude Include="$(MonoSourceLocation)\libgc\include\private\gcconfig.h">
-      <Filter>Header Files$(GCboehmFilterSubFolder)</Filter>
-    </ClInclude>
-    <ClInclude Include="$(MonoSourceLocation)\libgc\include\private\gc_priv.h">
-      <Filter>Header Files$(GCboehmFilterSubFolder)</Filter>
-    </ClInclude>
-    <ClInclude Include="$(MonoSourceLocation)\libgc\include\private\gc_hdrs.h">
-      <Filter>Header Files$(GCboehmFilterSubFolder)</Filter>
-    </ClInclude>
-    <ClInclude Include="$(MonoSourceLocation)\libgc\include\gc.h">
-      <Filter>Header Files$(GCboehmFilterSubFolder)</Filter>
-    </ClInclude>
-    <ClInclude Include="$(MonoSourceLocation)\libgc\include\gc_gcj.h">
-      <Filter>Header Files$(GCboehmFilterSubFolder)</Filter>
-    </ClInclude>
-    <ClInclude Include="$(MonoSourceLocation)\libgc\include\gc_mark.h">
-      <Filter>Header Files$(GCboehmFilterSubFolder)</Filter>
-    </ClInclude>
-    <ClInclude Include="$(MonoSourceLocation)\libgc\include\private\gc_locks.h">
+    <ClInclude Include="$(MonoSourceLocation)\external\bdwgc\include\gc.h">
       <Filter>Header Files$(GCboehmFilterSubFolder)</Filter>
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
-    <None Include="$(MonoSourceLocation)\libgc\Makefile.am">
+    <None Include="$(MonoSourceLocation)\external\bdwgc\Makefile.am">
       <Filter>Resource Files$(GCboehmFilterSubFolder)</Filter>
     </None>
   </ItemGroup>