[llvm-bugs] [Bug 24409] New: Linker error on Clang on Windows targeting gcc when exporting individual member functions
via llvm-bugs
llvm-bugs at lists.llvm.org
Sun Aug 9 16:58:44 PDT 2015
https://llvm.org/bugs/show_bug.cgi?id=24409
Bug ID: 24409
Summary: Linker error on Clang on Windows targeting gcc when
exporting individual member functions
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: release blocker
Priority: P
Component: C++
Assignee: unassignedclangbugs at nondot.org
Reporter: eldlistmailingz at tropicsoft.com
CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
Classification: Unclassified
When exporting individual member functions of a class clang does not export the
RTTI of that class, leading to a linker error when the class itself is the type
of an exception thrown from outside the DLL in which the class is defined.
// ex_decl.hpp
#ifndef EX_DECL_HPP
#define EX_DECL_HPP
#if defined(BLD_EX_EXAMPLE)
#define EX_DECL __attribute__((__dllexport__))
#else
#define EX_DECL __attribute__((__dllimport__))
#endif
#define EX_VISIBLE __attribute__((__visibility__("default")))
#endif // EX_DECL_HPP
// ex_exception.hpp
#ifndef EX_EXCEPTION_HPP
#define EX_EXCEPTION_HPP
#include <exception>
#include "ex_decl.hpp"
class EX_VISIBLE ex_exception :
public virtual std::exception
{
private:
char m_buffer[128];
protected:
EX_DECL unsigned int append(unsigned int l, const char * a);
EX_DECL ex_exception() ;
public:
typedef enum {
no_exception,
other_exception
} ex_exception_code;
ex_exception_code code;
EX_DECL ex_exception(ex_exception_code c,const char * e1 = 0,const char *
e2 = 0) ;
EX_DECL ex_exception(ex_exception const &) ;
virtual EX_DECL ~ex_exception() throw() ;
virtual EX_DECL const char * what() const throw() ;
};
#endif // EX_EXCEPTION_HPP
// ex_exception.cpp
#include <exception>
#include <cstring>
#define BLD_EX_EXAMPLE
#include "ex_exception.hpp"
EX_DECL unsigned int ex_exception::append(unsigned int l, const char * a){
while(l < (sizeof(m_buffer) - 1)){
char c = *a++;
if('\0' == c)
break;
m_buffer[l++] = c;
}
m_buffer[l] = '\0';
return l;
}
EX_DECL ex_exception::ex_exception(ex_exception_code c,const char * e1,const
char * e2) : code(c)
{
unsigned int length = 0;
switch(code){
case no_exception:
length = append(length, "uninitialized exception");
break;
case other_exception:
length = append(length, "unknown derived exception");
break;
default:
length = append(length, "programming error");
break;
}
}
EX_DECL ex_exception::ex_exception(ex_exception const & oth) :
std::exception(oth),code(oth.code)
{
std::memcpy(m_buffer,oth.m_buffer,sizeof m_buffer);
}
EX_DECL ex_exception::~ex_exception() throw() {}
EX_DECL const char * ex_exception::what() const throw() { return m_buffer; }
EX_DECL ex_exception::ex_exception() : code(no_exception) {}
// Compile ex_exception.cpp
clang++.exe -c -x c++ -D__MINGW_FORCE_SYS_INTRINS -Wno-unused-local-typedef
-Wno-dll-attribute-on-redeclaration -O0 -g -fno-inline -Wall -g -march=i686
-m32 -o "ex_exception.obj" "ex_exception.cpp"
// ex_xml_exception.hpp
#ifndef EX_XML_EXCEPTION_HPP
#define EX_XML_EXCEPTION_HPP
#include <exception>
#include "ex_decl.hpp"
#include "ex_exception.hpp"
class EX_VISIBLE ex_xml_exception :
public virtual ex_exception
{
public:
typedef enum {
xml_archive_parsing_error,
xml_archive_tag_mismatch,
xml_archive_tag_name_error
} ex_exception_code;
EX_DECL ex_xml_exception(ex_exception_code c,const char * e1 = 0,const char
* e2 = 0);
EX_DECL ex_xml_exception(ex_xml_exception const &) ;
virtual EX_DECL ~ex_xml_exception() throw() ;
};
#endif // EX_XML_EXCEPTION_HPP
// ex_xml_exception.cpp
#include <exception>
#define BLD_EX_EXAMPLE
#include "ex_xml_exception.hpp"
EX_DECL ex_xml_exception::ex_xml_exception(ex_exception_code c,const char *
e1,const char * e2) :
ex_exception(other_exception, e1, e2)
{
switch(c){
case xml_archive_parsing_error:
ex_exception::append(0, "unrecognized XML syntax");
break;
case xml_archive_tag_mismatch:
ex_exception::append(0, "XML start/end tag mismatch");
if(0 != e1){
ex_exception::append(0, " - ");
ex_exception::append(0, e1);
}
break;
case xml_archive_tag_name_error:
ex_exception::append(0, "Invalid XML tag name");
break;
default:
ex_exception::append(0, "programming error");
break;
}
}
EX_DECL ex_xml_exception::ex_xml_exception(ex_xml_exception const & oth) :
std::exception(oth),ex_exception(oth){}
EX_DECL ex_xml_exception::~ex_xml_exception() throw() {}
// Compile ex_xml_exception.cpp
clang++.exe -c -x c++ -D__MINGW_FORCE_SYS_INTRINS -Wno-unused-local-typedef
-Wno-dll-attribute-on-redeclaration -O0 -g -fno-inline -Wall -g -march=i686
-m32 -o "ex_xml_exception.obj" "ex_xml_exception.cpp"
// Link exmp.dll
clang++.exe -o "exmp.dll" -Wl,-soname -Wl,exmp.dll -shared -Wl,--start-group
"ex_exception.obj" "ex_xml_exception.obj" -Wl,-Bstatic -Wl,-Bdynamic
-Wl,--end-group -g -march=i686 -m32
// throw_exception_ex.cpp
#include "ex_xml_exception.hpp"
template<class E> void throw_exception(E const & e) { throw e; }
int main(int argc,char * argv[])
{
if (argc > 1)
{
throw_exception(ex_xml_exception(ex_xml_exception::xml_archive_parsing_error));
}
return 0;
}
// Compile throw_exception_ex.cpp
clang++.exe -c -x c++ -D__MINGW_FORCE_SYS_INTRINS -Wno-unused-local-typedef
-Wno-dll-attribute-on-redeclaration -O0 -g -fno-inline -Wall -g -march=i686
-m32 -o "throw_exception_ex.obj" "throw_exception_ex.cpp"
// Link thr_exmp.exe
clang++.exe -Wl,-R -Wl,"." -Wl,-rpath-link -Wl,"." -o "thr_exmp.exe"
-Wl,--start-group "throw_exception_ex.obj" "exmp.dll" -Wl,-Bstatic
-Wl,-Bdynamic -Wl,--end-group -g -march=i686 -m32
// Error message from this link
throw_exception_ex.obj: In function
'Z15throw_exceptionI16ex_xml_exceptionEvRKT_':
throw_exception_ex.cpp:2: undefined reference to `typeinfo for
ex_xml_exception'
clang++.exe: error: linker command failed with exit code 1 (use -v to see
invocation)
This is with the latest clang from trunk (r244427) using mingw-64/gcc-5.1 32
bit RTL (i686-5.1.0-posix-dwarf-rt_v4-rev0).
Compiling/linking the same code above with mingw-64/gcc-5.1:
// Compile ex_exception.cpp
g++ -ftemplate-depth-128 -Wno-unused-local-typedefs -ftrack-macro-expansion=0
-O0 -fno-inline -Wall -g -march=i686 -m32 -fvisibility-inlines-hidden
-fvisibility=hidden -c -o "ex_exception.o" "ex_exception.cpp"
// Compile ex_xml_exception.cpp
g++ -ftemplate-depth-128 -Wno-unused-local-typedefs -ftrack-macro-expansion=0
-O0 -fno-inline -Wall -g -march=i686 -m32 -fvisibility-inlines-hidden
-fvisibility=hidden -c -o "ex_xml_exception.o" "ex_xml_exception.cpp"
// Link exmp.dll
g++ "-Wl,--out-implib,exmp.dll.a" -o "exmp.dll" -shared -Wl,--start-group
"ex_exception.o" "ex_xml_exception.o" -Wl,-Bstatic -Wl,-Bdynamic
-Wl,--end-group -g -march=i686 -m32
// Compiling throw_exception_ex.cpp
g++ -ftemplate-depth-128 -Wno-unused-local-typedefs -ftrack-macro-expansion=0
-O0 -fno-inline -Wall -g -march=i686 -m32 -fvisibility-inlines-hidden
-fvisibility=hidden -c -o "throw_exception_ex.o" "throw_exception_ex.cpp"
// Link thr_exmp.exe
g++ -Wl,-R -Wl,"." -Wl,-rpath-link -Wl,"." -o "thr_exmp.exe" -Wl,--start-group
"throw_exception_ex.o" "exmp.dll.a" -Wl,-Bstatic -Wl,-Bdynamic
-Wl,--end-group -g -march=i686 -m32
produces no errors on the final link.
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