https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103629
--- Comment #18 from Andrew Pinski ---
Could Visibility not being applied correctly to lambdas but does that matter?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103629
--- Comment #17 from Jonathan Wakely ---
The difference is due to this change in std::call_once
- __once_callable = std::__addressof(__callable); // NOLINT: PR 82481
- __once_call = []{ (*(decltype(__callable)*)__once_callable)(); };
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103629
--- Comment #16 from Jonathan Wakely ---
With GCC 10 the same object gets used in the lambda and outside it:
0x7f52ed99f090
0x7f52ed99f090
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103629
--- Comment #15 from Jonathan Wakely ---
(In reply to Jonathan Wakely from comment #12)
> Simple makefile for comment 8:
A better one:
CXXFLAGS := -fvisibility=hidden -fvisibility-inlines-hidden -g
LDFLAGS := '-Wl,-rpath,$$ORIGIN' -pthread -L.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103629
--- Comment #14 from Jonathan Wakely ---
So one copy of that variable gets initialized, and a different copy gets
dereferenced, so it dereferences null.
If you change Tree.h to:
#pragma once
#include
#include
#include
class Tree
{
public:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103629
--- Comment #13 from Jonathan Wakely ---
Inside the lambda run by std::call_once, the address of sTreeTypeName is
0x404098, but after std::call_once finishes, the address of the object being
dereferenced is 0x77fc2090
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103629
--- Comment #12 from Jonathan Wakely ---
Simple makefile for comment 8:
CXXFLAGS := -fvisibility=hidden -fvisibility-inlines-hidden
vdb_view: main.o Module.o libopenvdb.so
$(CXX) -o $@ $^ -pthread '-Wl,-rpath,$$ORIGIN'
libopenvdb.so: o
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103629
--- Comment #11 from Andrew Pinski ---
Plus please don't use cmake and just make a simple makefile for testcases like
this cnake brings in a lot of crap for no reason.
