[lldb][windows] Allow exporting plugin symbols in LLDB_EXPORT_ALL_SYMBOLS

[River707]

Plugins aren't exported by default in the msvc path because we explicitly
limit the symbols exported to prevent hitting the symbol export limit.
Some plugins, however, can still be useful for downstream projects to
build on, e.g. the Mojo language uses parts of the dwarf plugin to implement
dwarf handling within its debugger plugin.

This PR adds a cmake variable in the MSVC path,
LLDB_EXPORT_ALL_SYMBOLS_PLUGINS, that allows for providing the set
of plugins to export symbols from.

[llvmbot]

@llvm/pr-subscribers-lldb

Author: River Riddle (River707)

Changes

These are already exported in non-windows builds, they aren't in the msvc path because we explicitly limit the symbols exported to prevent hitting the symbol export limit.

These symbols are useful for downstream projects that want to utilize code within the dwarf plugin. The Mojo language uses these to implement dwarf handling within its debugger plugin.

---

Full diff: https://github.com/llvm/llvm-project/pull/71087.diff

1 Files Affected:

• (modified) lldb/source/API/CMakeLists.txt (+5-3)

diff --git a/lldb/source/API/CMakeLists.txt b/lldb/source/API/CMakeLists.txt
index 895c6221a8073cf..76e6caceb392303 100644
--- a/lldb/source/API/CMakeLists.txt
+++ b/lldb/source/API/CMakeLists.txt
@@ -196,13 +196,15 @@ elseif (LLDB_EXPORT_ALL_SYMBOLS)
   MESSAGE("-- Symbols (liblldb): exporting all symbols from the lldb and lldb_private namespaces")
 
   # Pull out the various lldb libraries linked into liblldb, these will be used
-  # when looking for symbols to extract. We ignore plugin libraries here,
-  # because these symbols aren't publicly exposed.
+  # when looking for symbols to extract. We ignore most plugin libraries here,
+  # because we may expose more symbols than the DLL limit and these symbols
+  # aren't useful to expose.
   get_target_property(all_liblldb_libs liblldb LINK_LIBRARIES)
   set(lldb_libs "")
   foreach(lib ${all_liblldb_libs})
     if(TARGET ${lib} AND ${lib} MATCHES "^lldb" AND
-       NOT ${lib} MATCHES "^lldbPlugin")
+       (${lib} MATCHES "^lldbPluginSymbolFileDWARF" OR
+        NOT ${lib} MATCHES "^lldbPlugin"))
       get_target_property(lib_type ${lib} TYPE)
       if("${lib_type}" STREQUAL "STATIC_LIBRARY")
         list(APPEND lldb_libs ${lib})

[bulbazord]

Thanks!

[River707]

Thanks for the reviews!!