Date: Thu, 14 Apr 2016 21:28:27 +0930 From: Shane Ambler <FreeBSD@ShaneWare.Biz> To: FreeBSD-ports <freebsd-ports@freebsd.org> Subject: Need some help with c++/qt5 code Message-ID: <570F85E3.6060000@ShaneWare.Biz>
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Hi there, while I am comfortable with c and python, I only know a little
c++ and could use some help.
I am in the process of getting a QT5 based app running on FreeBSD and
have an issue that I'm not sure how to resolve. The project is opentoonz
which is a commercial project that was recently open sourced. The code
base has been previously built only on OSX and windows
By using work others have done to build on linux I have got to the point
of compiling and linking on FreeBSD but get a segfault on startup. The
failing code is part of the variable initialising run before the first
line of main()
I am using clang 3.4.1 on 10-STABLE-amd64, (gcc build needs more work)
the binary is linked to gcc48/libgcc_s.so which is needed for the
superlu/blas libraries that are used.
The class definition is -
class TPanelFactory
{
QString m_panelType;
static QMap<QString, TPanelFactory *> m_table;
public:
TPanelFactory(QString panelType);
~TPanelFactory();
QString getPanelType() const { return m_panelType; }
virtual void initialize(TPanel *panel) = 0;
virtual TPanel *createPanel(QWidget *parent);
static TPanel *createPanel(QWidget *parent, QString panelType);
};
m_table is then in the source file as
QMap<QString, TPanelFactory *> TPanelFactory::m_table;
The segfault happens in the constructor -
TPanelFactory::TPanelFactory(QString panelType)
: m_panelType(panelType)
{
assert(m_table.count(panelType) == 0);
m_table[m_panelType] = this;
}
the last line causes the segfault, if I comment it out then main() is
entered, but I expect removing that line will bite back soon enough.
How can I get this working?
Why would this fail on FreeBSD but not OSX or windows?
The backtrace I get from lldb and gdb -
% lldb opentoonz
Current executable set to 'opentoonz' (x86_64).
(lldb) run
Process 80086 launching
Process 80086 stopped
(lldb) Process 80086 launched:
'/home/shane/Projects/opentoonz/test_install/bin/opentoonz' (x86_64)
Process 80086 stopped
* (lldb) thread #1: tid = 101033, 0x00000000004f2026
opentoonz`TPanelFactory::TPanelFactory(QString) + 70, stop reason =
invalid address (fault address: 0x0)
frame #0: 0x00000000004f2026
opentoonz`TPanelFactory::TPanelFactory(QString) + 70
opentoonz`TPanelFactory::TPanelFactory(QString) + 70:
-> 0x4f2026: cmpl $0x2, (%rax)
0x4f2029: jb 0x4f203d ;
TPanelFactory::TPanelFactory(QString) + 93
0x4f202b: movq 0x73eb5e(%rip), %r15 ; opentoonz..got + 6728
0x4f2032: movq %r15, %rdi
(lldb) bt
* thread #1: tid = 101033, 0x00000000004f2026
opentoonz`TPanelFactory::TPanelFactory(QString) + 70, stop reason =
invalid address (fault address: 0x0)
* frame #0: 0x00000000004f2026
opentoonz`TPanelFactory::TPanelFactory(QString) + 70
frame #1: 0x0000000000570cfd
opentoonz`XsheetViewerFactory::XsheetViewerFactory() + 45
frame #2: 0x000000000056fd47 opentoonz`_GLOBAL__I_a + 1687
frame #3: 0x0000000000809d22 opentoonz`__do_global_ctors_aux + 34
frame #4: 0x00000000004854ae opentoonz`_init + 14
frame #5: 0x0000000800c02c9f
frame #6: 0x0000000800c0228e
(lldb) quit
% gdb opentoonz
...
(gdb) run
Starting program: /home/shane/Projects/opentoonz/test_install/bin/opentoonz
Program received signal SIGSEGV, Segmentation fault.
0x00000000004f2026 in TPanelFactory::TPanelFactory(QString) ()
(gdb) bt
#0 0x00000000004f2026 in TPanelFactory::TPanelFactory(QString) ()
#1 0x0000000000570cfd in XsheetViewerFactory::XsheetViewerFactory() ()
#2 0x000000000056fd47 in global constructors keyed to a ()
#3 0x0000000000809d22 in __do_global_ctors_aux ()
#4 0x00000000004854ae in _init ()
#5 0x00007fffffffda20 in ?? ()
#6 0x0000000800c02c9f in objlist_call_init () from /libexec/ld-elf.so.1
#7 0x0000000800c0228e in _rtld () from /libexec/ld-elf.so.1
#8 0x0000000800c00449 in .rtld_start () from /libexec/ld-elf.so.1
#9 0x0000000000000000 in ?? ()
(gdb) quit
--
FreeBSD - the place to B...Software Developing
Shane Ambler
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