https://sourceware.org/bugzilla/show_bug.cgi?id=22705
Bug ID: 22705
Summary: FR: implement why-live and why-load flags
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: ppluzhnikov at google dot com
CC: ian at airs dot com
Target Milestone: ---
It is often hard to tell why a function is being linked in.
It is even harder to tell why a function survives --gc-sections.
Apple has "-why_live" and "-why_load"
https://www.unix.com/man-page/osx/1/ld/
Options for introspecting the linker
-why_load Log why each object file in a static library is loaded. That
is, what symbol was
needed. Also called -whyload for compatibility.
-why_live symbol_name
Logs a chain of references to symbol_name. Only applicable
with -dead_strip .
It can help debug why something that you think should be dead
strip removed is
not removed.
Example output from https://people.freedesktop.org/~michael/why_live.filt.txt
chart::ChartTypeTabPage::ChartTypeTabPage(Window*,
com::sun::star::uno::Reference<com::sun::star::chart2::XChartDocument> const&,
com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext> const&,
bool, bool) from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(tp_ChartType.o)
chart::ChartTypeTabPage::ChartTypeTabPage(Window*,
com::sun::star::uno::Reference<com::sun::star::chart2::XChartDocument> const&,
com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext> const&,
bool, bool) from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(tp_ChartType.o)
chart::ChartTypeDialog::ChartTypeDialog(Window*,
com::sun::star::uno::Reference<com::sun::star::frame::XModel> const&,
com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext> const&)
from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(dlg_ChartType.o)
chart::ChartTypeDialog::ChartTypeDialog(Window*,
com::sun::star::uno::Reference<com::sun::star::frame::XModel> const&,
com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext> const&)
from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(dlg_ChartType.o)
chart::ChartTypeUnoDlg::createDialog(Window*) from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(dlg_ChartType_UNO.o)
vtable for chart::ChartTypeUnoDlg from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(dlg_ChartType_UNO.o)
chart::ChartTypeUnoDlg::ChartTypeUnoDlg(com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext>
const&) from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(dlg_ChartType_UNO.o)
chart::ChartTypeUnoDlg::Create(com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext>
const&) from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(dlg_ChartType_UNO.o)
g_entries_chart2_controller from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(_serviceregistration_controller.o)
_chartcontroller_component_getFactory from
/Users/tml/lo/armopt/instdir/program/libchartcontrollerlo.a(_serviceregistration_controller.o)
__MergedGlobals from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/lo.o
_lo_get_factory_map from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/lo.o
cppuhelper::detail::loadSharedLibComponentFactory(rtl::OUString const&,
rtl::OUString const&, rtl::OUString const&, rtl::OUString const&, rtl::OUString
const&,
com::sun::star::uno::Reference<com::sun::star::lang::XMultiServiceFactory>
const&, com::sun::star::uno::XInterface*
(**)(com::sun::star::uno::XComponentContext*,
com::sun::star::uno::Sequence<com::sun::star::uno::Any> const&),
com::sun::star::uno::Reference<com::sun::star::uno::XInterface>*) from
/Users/tml/lo/armopt/instdir/program/libuno_cppuhelpergcc3.a(shlib.o)
cppuhelper::ServiceManager::loadImplementation(com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext>
const&, boost::shared_ptr<cppuhelper::ServiceManager::Data::Implementation>&)
from
/Users/tml/lo/armopt/instdir/program/libuno_cppuhelpergcc3.a(servicemanager.o)
(anonymous
namespace)::SingletonFactory::createInstanceWithArgumentsAndContext(com::sun::star::uno::Sequence<com::sun::star::uno::Any>
const&, com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext>
const&) from
/Users/tml/lo/armopt/instdir/program/libuno_cppuhelpergcc3.a(servicemanager.o)
non-virtual thunk to (anonymous
namespace)::SingletonFactory::createInstanceWithArgumentsAndContext(com::sun::star::uno::Sequence<com::sun::star::uno::Any>
const&, com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext>
const&) from
/Users/tml/lo/armopt/instdir/program/libuno_cppuhelpergcc3.a(servicemanager.o)
vtable for (anonymous
namespace)::SingletonFactory from
/Users/tml/lo/armopt/instdir/program/libuno_cppuhelpergcc3.a(servicemanager.o)
cppuhelper::ServiceManager::addSingletonContextEntries(std::__1::vector<cppu::ContextEntry_Init,
std::__1::allocator<cppu::ContextEntry_Init> >*) from
/Users/tml/lo/armopt/instdir/program/libuno_cppuhelpergcc3.a(servicemanager.o)
cppu::defaultBootstrap_InitialComponentContext(rtl::OUString const&) from
/Users/tml/lo/armopt/instdir/program/libuno_cppuhelpergcc3.a(defaultbootstrap.o)
cppu::defaultBootstrap_InitialComponentContext() from
/Users/tml/lo/armopt/instdir/program/libuno_cppuhelpergcc3.a(defaultbootstrap.o)
desktop::Desktop::InitApplicationServiceManager() from
/Users/tml/lo/armopt/instdir/program/libsofficeapp.a(appinit.o)
desktop::Desktop::Init() from
/Users/tml/lo/armopt/instdir/program/libsofficeapp.a(app.o)
vtable for desktop::Desktop
from /Users/tml/lo/armopt/instdir/program/libsofficeapp.a(app.o)
desktop::Desktop::~Desktop() from
/Users/tml/lo/armopt/instdir/program/libsofficeapp.a(app.o)
desktop::Desktop::~Desktop() from
/Users/tml/lo/armopt/instdir/program/libsofficeapp.a(app.o)
_soffice_main from
/Users/tml/lo/armopt/instdir/program/libsofficeapp.a(sofficemain.o)
_touch_lo_runMain
from /Users/tml/lo/armopt/instdir/program/libsofficeapp.a(sofficemain.o)
-[AppDelegate
threadMainMethod:] from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/AppDelegate.o
l_OBJC_$_INSTANCE_METHODS_AppDelegate from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/AppDelegate.o
l_OBJC_CLASS_RO_$_AppDelegate from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/AppDelegate.o
_OBJC_CLASS_$_AppDelegate from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/AppDelegate.o
objc-class-ref from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/main.o
_main
from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/main.o
_main
from
/Users/tml/lo/armopt/ios/experimental/TiledLibreOffice/build/TiledLibreOffice.build/Release-iphoneos/TiledLibreOffice.build/Objects-normal/armv7/main.o
This has been mentioned here:
https://sourceware.org/ml/binutils/2014-04/msg00255.html
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