On 8 April 2014 17:49, Greg Clayton <[email protected]> wrote:
>
> The whole premise of the GCC changes were that the definition would be
> available elsewhere, but in this case that isn't the case.
I've run into the same issue on FreeBSD, while trying to debug a clang
built with the system clang-3.4.
* thread #1: tid = 104525, 0x000000081191ff6e
libclangCodeGen.so`clang::CodeGen::CGDebugInfo::CreateType(this=0x0000000815c0a000,
BT=0x0000000815c3d400) + 30 at CGDebugInfo.cpp:391, stop reason =
breakpoint 1.1
frame #0: 0x000000081191ff6e
libclangCodeGen.so`clang::CodeGen::CGDebugInfo::CreateType(this=0x0000000815c0a000,
BT=0x0000000815c3d400) + 30 at CGDebugInfo.cpp:391
388 /// CreateType - Get the Basic type from the cache or create a new
389 /// one if necessary.
390 llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT) {
-> 391 unsigned Encoding = 0;
392 StringRef BTName;
393 switch (BT->getKind()) {
394 #define BUILTIN_TYPE(Id, SingletonId)
(lldb) p BT
Assertion failed: (D && "Cannot get layout of forward declarations!"),
function getASTRecordLayout, file
../tools/clang/lib/AST/RecordLayoutBuilder.cpp, line 2783.
In my case the there is a definition available elsewhere:
(lldb) image lookup --type BuiltinType
Best match found in /tank/emaste/ctsrd/llvm/Build/lib/libclangCodeGen.so:
id = {0x0088df97}, name = "BuiltinType", qualified =
"clang::BuiltinType", byte-size = 24, decl = Type.h:1842, clang_type =
"class BuiltinType : public clang::Type {
...
> Yes, by default on darwin clang doesn't use this debug info minimizing trick.
> On linux you will need to disable it if you have a clang that supports this
> optimization.
Do you know off-hand how it's disabled on Darwin? It seems like we
probably want FreeBSD's clang to behave the same way, by default.
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