[clang] 0d3eeac - [clang-repl] Fix BUILD_SHARED_LIBS symbols from libclangInterpreter on MinGW (#71393)

[via cfe-commits]

Author: Martin Storsjö
Date: 2023-11-07T11:48:12+02:00
New Revision: 0d3eeac8c0f45410398a87f72ae38ea6ae1c3073

URL: https://github.com/llvm/llvm-project/commit/0d3eeac8c0f45410398a87f72ae38ea6ae1c3073
DIFF: https://github.com/llvm/llvm-project/commit/0d3eeac8c0f45410398a87f72ae38ea6ae1c3073.diff

LOG: [clang-repl] Fix BUILD_SHARED_LIBS symbols from libclangInterpreter on MinGW (#71393)

A few symbols within libclangInterpreter have got explicit dllexport
attributes, in order to make them exported (and thus visible at runtime)
in any build, not only when they are part of e.g. a DLL libclang-cpp,
but also when they are part of a plain .exe.

Due to the explicit dllexports, these symbols would sidestep the regular
MinGW logic of exporting all symbols if there are no dllexports.
Therefore, for libclang-cpp, a separate fix was made in
592e935e115ffb451eb9b782376711dab6558fe0, to pass --export-all-symbols
to the build of libclang-cpp.

If building with BUILD_SHARED_LIBS enabled, then the same issue appears
in libclangInterpreter; pass the same flag --export-all-symbols there as
well, to make sure all symbols are visible, not only the ones that are
explicitly marked as dllexport.

Added: 
    

Modified: 
    clang/lib/Interpreter/CMakeLists.txt

Removed: 
    


################################################################################
diff  --git a/clang/lib/Interpreter/CMakeLists.txt b/clang/lib/Interpreter/CMakeLists.txt
index 84f6ca5271d2ab0..9065f998f73c473 100644
--- a/clang/lib/Interpreter/CMakeLists.txt
+++ b/clang/lib/Interpreter/CMakeLists.txt
@@ -38,3 +38,14 @@ add_clang_library(clangInterpreter
   clangSema
   clangSerialization
   )
+
+if ((MINGW OR CYGWIN) AND BUILD_SHARED_LIBS)
+  # The DLLs are supposed to export all symbols (except for ones that are
+  # explicitly hidden). Normally, this is what happens anyway, but if there
+  # are symbols that are marked explicitly as dllexport, we'd only export them
+  # and nothing else. The Interpreter contains a few cases of such dllexports
+  # (for symbols that need to be exported even from standalone exe files);
+  # therefore, add --export-all-symbols to make sure we export all symbols
+  # despite potential dllexports.
+  target_link_options(clangInterpreter PRIVATE LINKER:--export-all-symbols)
+endif()