C++ 使用LTO构建debian包,但其静态库组件(.a文件)没有符号
谢谢你的时间 我很难用LTO构建debian包。当我在没有LTO的情况下构建它时,一切都很好。但是,当启用LTO时,静态库组件会丢失其所有符号,如下所示,这会在链接时导致未定义的引用错误C++ 使用LTO构建debian包,但其静态库组件(.a文件)没有符号,c++,c,gcc,dpkg,lto,C++,C,Gcc,Dpkg,Lto,谢谢你的时间 我很难用LTO构建debian包。当我在没有LTO的情况下构建它时,一切都很好。但是,当启用LTO时,静态库组件会丢失其所有符号,如下所示,这会在链接时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: qqmlj
$ 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
...
我尝试了使用和不使用-ffat lto对象,但都没有效果。我可以确认在建造过程中,在dh_strip阶段之前,符号仍然存在。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, unsigned long, 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()
...
...
除了原始软件包的默认设置之外,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"
下面的消息是没有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, unsigned long)
U QArrayData::shared_null
U QArrayData::allocate(unsigned long, unsigned long, unsigned long, QFlags<QArrayData::AllocationOption>)
U QAbstractConcatenable::appendLatin1To(char const*, int, 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()
...
...
$nm./libQt5QmlDevTools.a-C
qqmljsast.o:
退欧
U uuu cxa U guard U acquire
U\U\U cxa\U护罩\U释放
虚拟的
U(U)dso(U)手柄
U(全局)(偏移)(表)_
0000000000000000卢比LC0
00000000000000 40 r.LC1
00000000000000 80 r.LC2
00000000000000 C0 r.LC3
0000000000000 100 r.LC4
0000000000000000卢比LC6
000000000000000 5 r.LC7
马洛克大学
U memcpy
U qt_版本_标签
U realloc
U(U)堆栈(U)chk(U)失败
U运算符==(QString常量&,QString常量&)
QQmlJS::AST::NumericLiteralPropertyName::asString()const::locale的0000000000000000 b保护变量
U QArrayData::解除分配(QArrayData*,无符号长,无符号长)
U QArrayData::共享_null
U QArrayData::allocate(无符号长、无符号长、无符号长、QFlags)
U QAbstractConcatenable::appendLatin1To(char const*,int,QChar*)
0000000000000000 W QQmlJS::MemoryPool::allocate\u helper(无符号长)
0000000000005510T 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::表达式::accept0(QQmlJS::AST::Visitor*)
0000000000000000 W QQmlJS::AST::表达式::~表达式()
0000000000000000 W QQmlJS::AST::表达式::~表达式()
0000000000000000 W QQmlJS::AST::表达式::~表达式()
0000000000000000 n QQmlJS::AST::表达式::~表达式()
...
...
$ 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, unsigned long)
U QArrayData::shared_null
U QArrayData::allocate(unsigned long, unsigned long, unsigned long, QFlags<QArrayData::AllocationOption>)
U QAbstractConcatenable::appendLatin1To(char const*, int, 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()
...
...