如何解决使用LTO构建一个Debian软件包,但其静态库组件.a文件没有符号
感谢您的时间!
我很难用LTO构建一个Debian软件包。当我不使用LTO进行构建时,一切正常。但是,启用LTO后,静态库组件将丢失所有符号,如下所示,当链接它们时,会导致未定义的引用错误。
$ nm ./libQt5QmlDevTools.a -C
qqmljsast.o:
nm: qqmljsast.o: no symbols
qqmljsastvisitor.o:
nm: qqmljsastvisitor.o: no symbols
qqmljsengine_p.o:
nm: qqmljsengine_p.o: no symbols
qqmljslexer.o:
nm: qqmljslexer.o: no symbols
qv4bytecodegenerator.o:
nm: qv4bytecodegenerator.o: no symbols
...
我尝试使用-ffat-lto-objects和不使用-ffat-lto-objects,但是都没有帮助。我可以确认符号在构建过程的 dh_strip 阶段之前仍然存在。似乎有些操作后来删除了.a文件中的所有符号
$ nm ./libQt5QmlDevTools.a -C
qqmljsast.o:
U __cxa_atexit
U __cxa_guard_acquire
U __cxa_guard_release
U __cxa_pure_virtual
U __dso_handle
U operator==(QString const&,QString const&)
U QArrayData::deallocate(QArrayData*,unsigned long,unsigned long)
U QArrayData::shared_null
U QArrayData::allocate(unsigned long,QFlags<QArrayData::AllocationOption>)
00000000 W QConcatenable<QString>::appendTo(QString const&,QChar*&)
U QAbstractConcatenable::appendLatin1To(char const*,int,QChar*)
00000000 W QQmlJS::MemoryPool::allocate_helper(unsigned long)
00000000 W QQmlJS::MemoryPool::allocate(unsigned long)
00000000 T QQmlJS::AST::CaseClause::accept0(QQmlJS::AST::Visitor*)
00000000 W QQmlJS::AST::CaseClause::~CaseClause()
00000000 W QQmlJS::AST::CaseClause::~CaseClause()
00000000 W QQmlJS::AST::CaseClause::~CaseClause()
00000000 T QQmlJS::AST::Expression::accept0(QQmlJS::AST::Visitor*)
00000000 W QQmlJS::AST::Expression::~Expression()
00000000 W QQmlJS::AST::Expression::~Expression()
00000000 W QQmlJS::AST::Expression::~Expression()
...
...
dh_strip_nondeterminism
dh_compress
dh_fixperms
debian/rules override_dh_missing
make[1]: Entering directory '/G/Packages/Qt/qtdeclarative'
dh_missing --fail-missing
make[1]: Leaving directory '/G/Packages/Qt/qtdeclarative'
dh_dwz
dh_strip
dh_makeshlibs
dh_shlibdeps
dh_installdeb
dh_gencontrol
dh_md5sums
dh_builddeb
除了原始包的默认设置外,我使用的其他标志是:
export DEB_CFLAGS_APPEND="-O3 -flto=jobserver -fdevirtualize-at-ltrans -fipa-pta -flto-odr-type-merging -ffat-lto-objects -flto-compression-level=9"
export DEB_CXXFLAGS_APPEND="-O3 -flto=jobserver -fdevirtualize-at-ltrans -fipa-pta -flto-odr-type-merging -ffat-lto-objects -flto-compression-level=9"
export DEB_LDFLAGS_APPEND="-O3 -flto=jobserver -fdevirtualize-at-ltrans -fipa-pta -flto-odr-type-merging -ffat-lto-objects -flto-compression-level=9"
下面的消息是不使用LTO构建的.a文件的nm输出
$ nm ./libQt5QmlDevTools.a -C
qqmljsast.o:
U __cxa_atexit
U __cxa_guard_acquire
U __cxa_guard_release
U __cxa_pure_virtual
U __dso_handle
U _GLOBAL_OFFSET_TABLE_
0000000000000000 r .LC0
0000000000000040 r .LC1
0000000000000080 r .LC2
00000000000000c0 r .LC3
0000000000000100 r .LC4
0000000000000000 r .LC6
0000000000000005 r .LC7
U malloc
U memcpy
U qt_version_tag
U realloc
U __stack_chk_fail
U operator==(QString const&,QString const&)
0000000000000000 b guard variable for QQmlJS::AST::NumericLiteralPropertyName::asString() const::locale
U QArrayData::deallocate(QArrayData*,unsigned long)
U QArrayData::shared_null
U QArrayData::allocate(unsigned long,QFlags<QArrayData::AllocationOption>)
U QAbstractConcatenable::appendLatin1To(char const*,QChar*)
0000000000000000 W QQmlJS::MemoryPool::allocate_helper(unsigned long)
0000000000005510 T QQmlJS::AST::CaseClause::accept0(QQmlJS::AST::Visitor*)
0000000000000000 W QQmlJS::AST::CaseClause::~CaseClause()
0000000000000000 W QQmlJS::AST::CaseClause::~CaseClause()
0000000000000000 W QQmlJS::AST::CaseClause::~CaseClause()
0000000000000000 n QQmlJS::AST::CaseClause::~CaseClause()
0000000000004ee0 T QQmlJS::AST::Expression::accept0(QQmlJS::AST::Visitor*)
0000000000000000 W QQmlJS::AST::Expression::~Expression()
0000000000000000 W QQmlJS::AST::Expression::~Expression()
0000000000000000 W QQmlJS::AST::Expression::~Expression()
0000000000000000 n QQmlJS::AST::Expression::~Expression()
...
...
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