Add the `lto_codegen_set_export_dynamic' function.
This function sets the `_exportDynamic' ivar. When that's set, we export all
symbols (e.g. we don't run the internalize pass). This is equivalent to the
`--export-dynamic' linker flag in GNU land:
--export-dynamic
When creating a dynamically linked executable, add all symbols to the dynamic
symbol table. The dynamic symbol table is the set of symbols which are visible
from dynamic objects at run time. If you do not use this option, the dynamic
symbol table will normally contain only those symbols which are referenced by
some dynamic object mentioned in the link. If you use dlopen to load a dynamic
object which needs to refer back to the symbols defined by the program, rather
than some other dynamic object, then you will probably need to use this option
when linking the program itself.
The Darwin linker will support this via the `-export_dynamic' flag. We should
modify clang to support this via the `-rdynamic' flag.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169656 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/lto/LTOCodeGenerator.cpp b/tools/lto/LTOCodeGenerator.cpp
index 4098396..90c47eb 100644
--- a/tools/lto/LTOCodeGenerator.cpp
+++ b/tools/lto/LTOCodeGenerator.cpp
@@ -66,7 +66,7 @@
: _context(getGlobalContext()),
_linker("LinkTimeOptimizer", "ld-temp.o", _context), _target(NULL),
_emitDwarfDebugInfo(false), _scopeRestrictionsDone(false),
- _codeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC),
+ _exportDynamic(false), _codeModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC),
_nativeObjectFile(NULL) {
InitializeAllTargets();
InitializeAllTargetMCs();
@@ -339,7 +339,8 @@
LLVMCompilerUsed->setSection("llvm.metadata");
- passes.add(createInternalizePass(mustPreserveList));
+ if (!_exportDynamic)
+ passes.add(createInternalizePass(mustPreserveList));
// apply scope restrictions
passes.run(*mergedModule);
@@ -377,7 +378,8 @@
// Enabling internalize here would use its AllButMain variant. It
// keeps only main if it exists and does nothing for libraries. Instead
// we create the pass ourselves with the symbol list provided by the linker.
- PassManagerBuilder().populateLTOPassManager(passes, /*Internalize=*/false,
+ PassManagerBuilder().populateLTOPassManager(passes,
+ /*Internalize=*/!_exportDynamic,
!DisableInline,
DisableGVNLoadPRE);