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<div class="moz-text-flowed" style="font-family: -moz-fixed;
font-size: 14px;" lang="x-unicode">Using clang on Windows
targeting mingw(-64)/gcc since it does not appear possible to
export individual member functions of a class, as well as export
the RTTI of the class, without exporting the entire class, I have
changed my example in my post "Linker error and obfuscated name"
to export the entire class itself. But I am still seeing a linker
error, Here is the changed code and command lines:
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<br>
// ex_decl.hpp
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<br>
#ifndef EX_DECL_HPP
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#define EX_DECL_HPP
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#if defined(BLD_EX_EXAMPLE)
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#define EX_DECL __attribute__((__dllexport__))
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#else
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#define EX_DECL __attribute__((__dllimport__))
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#endif
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#endif // EX_DECL_HPP
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// ex_exception.hpp
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<br>
#ifndef EX_EXCEPTION_HPP
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#define EX_EXCEPTION_HPP
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#include <exception>
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#include "ex_decl.hpp"
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class EX_DECL ex_exception :
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public virtual std::exception
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{
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private:
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char m_buffer[128];
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protected:
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unsigned int append(unsigned int l, const char * a);
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ex_exception() ;
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public:
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typedef enum {
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no_exception,
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other_exception
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} ex_exception_code;
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ex_exception_code code;
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ex_exception(ex_exception_code c,const char * e1 = 0,const
char * e2 = 0) ;
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ex_exception(ex_exception const &) ;
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virtual ~ex_exception() throw() ;
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virtual const char * what() const throw() ;
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};
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#endif // EX_EXCEPTION_HPP
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// ex_exception.cpp
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#include <exception>
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#include <cstring>
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#define BLD_EX_EXAMPLE
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#include "ex_exception.hpp"
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unsigned int ex_exception::append(unsigned int l, const char * a){
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while(l < (sizeof(m_buffer) - 1)){
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char c = *a++;
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if('\0' == c)
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break;
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m_buffer[l++] = c;
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}
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m_buffer[l] = '\0';
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return l;
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}
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ex_exception::ex_exception(ex_exception_code c,const char *
e1,const char * e2) : code(c)
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{
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unsigned int length = 0;
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switch(code){
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case no_exception:
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length = append(length, "uninitialized exception");
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break;
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case other_exception:
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length = append(length, "unknown derived exception");
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break;
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default:
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length = append(length, "programming error");
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break;
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}
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}
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ex_exception::ex_exception(ex_exception const & oth) :
std::exception(oth),code(oth.code)
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{
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std::memcpy(m_buffer,oth.m_buffer,sizeof m_buffer);
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}
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ex_exception::~ex_exception() throw() {}
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const char * ex_exception::what() const throw() { return m_buffer;
}
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ex_exception::ex_exception() : code(no_exception) {}
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// Compile ex_exception.cpp
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<br>
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"
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// ex_xml_exception.hpp
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<br>
#ifndef EX_XML_EXCEPTION_HPP
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#define EX_XML_EXCEPTION_HPP
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#include <exception>
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#include "ex_decl.hpp"
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#include "ex_exception.hpp"
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class EX_DECL ex_xml_exception :
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public virtual ex_exception
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{
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public:
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typedef enum {
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xml_archive_parsing_error,
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xml_archive_tag_mismatch,
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xml_archive_tag_name_error
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} ex_exception_code;
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ex_xml_exception(ex_exception_code c,const char * e1 = 0,const
char * e2 = 0);
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ex_xml_exception(ex_xml_exception const &) ;
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virtual ~ex_xml_exception() throw() ;
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};
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#endif // EX_XML_EXCEPTION_HPP
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// ex_xml_exception.cpp
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<br>
#include <exception>
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#define BLD_EX_EXAMPLE
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#include "ex_xml_exception.hpp"
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ex_xml_exception::ex_xml_exception(ex_exception_code c,const char
* e1,const char * e2) :
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ex_exception(other_exception, e1, e2)
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{
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switch(c){
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case xml_archive_parsing_error:
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ex_exception::append(0, "unrecognized XML syntax");
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break;
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case xml_archive_tag_mismatch:
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ex_exception::append(0, "XML start/end tag mismatch");
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if(0 != e1){
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ex_exception::append(0, " - ");
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ex_exception::append(0, e1);
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}
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break;
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case xml_archive_tag_name_error:
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ex_exception::append(0, "Invalid XML tag name");
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break;
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default:
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ex_exception::append(0, "programming error");
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break;
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}
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}
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ex_xml_exception::ex_xml_exception(ex_xml_exception const &
oth) : std::exception(oth),ex_exception(oth){}
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ex_xml_exception::~ex_xml_exception() throw() {}
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// Compile ex_xml_exception.cpp
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<br>
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"
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// Link exmp-clang37-d-1_59.dll
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<br>
clang++.exe -o "exmp-clang37-d-1_59.dll" -Wl,-soname
-Wl,exmp-clang37-d-1_59.dll -shared -Wl,--start-group
"ex_exception.obj" "ex_xml_exception.obj" -Wl,-Bstatic
-Wl,-Bdynamic -Wl,--end-group -g -march=i686 -m32
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// throw_exception_ex.cpp
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#include "ex_xml_exception.hpp"
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template<class E> void throw_exception(E const & e) {
throw e; }
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int main(int argc,char * argv[])
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{
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if (argc > 1)
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{
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throw_exception(ex_xml_exception(ex_xml_exception::xml_archive_parsing_error));
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}
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return 0;
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}
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// Compile throw_exception_ex.cpp
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<br>
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"
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<br>
// Link thr_exmp.exe
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<br>
clang++.exe -Wl,-R -Wl,"." -Wl,-rpath-link -Wl,"." -o
"thr_exmp.exe" -Wl,--start-group "throw_exception_ex.obj"
"exmp-clang37-d-1_59.dll" -Wl,-Bstatic -Wl,-Bdynamic
-Wl,--end-group -g -march=i686 -m32
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// Error message from this link
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<br>
throw_exception_ex.obj: In function
`Z15throw_exceptionI16ex_xml_exceptionEvRKT_':
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throw_exception_ex.cpp:2: undefined reference to
`_imp___ZTI16ex_xml_exception'
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clang++.exe: error: linker command failed with exit code 1 (use -v
to see invocation)
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<br>
So even when I export/import the entire class rather than
individual member functions, I can not link my final module
successfully as it is still looking for something in the shared
library that it says is not there.
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<br>
This same code succeeds without problem with mingw(-64)/gcc on
Windows.
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