问题
I'm using autotools as build system for a library of mine. Recently library is ported to Windows. Library compiles and links successfully though I encountered a strange error. There is only static libraries after configure and make. Evertything looks OK except a warning from libtool:
libtool: undefined symbols not allowed in i686-pc-mingw32 shared
I have exported all symbols for Windows machines by this code:
#ifdef _WIN32
# ifdef DLL_EXPORT
# define LIBRARY_API __declspec(dllexport)
# else
# define LIBRARY_API __declspec(dllimport)
# endif
#endif
#ifndef _WIN32
# define LIBRARY_API
#endif
And in every single definition I have:
class LIBRARY_API myClass {
// ...
Notes:
Operating System: Windows 8 x86_64
Compiler suite: MinGW x86_64, MSYS x86
回答1:
In your configure.ac, make sure your libtool initialization looks like:
LT_INIT([win32-dll])
Also, you need to pass -no-undefined flag to libtool in your Makefile.am. This flag disables the warning you are getting:
libexample_la_LDFLAGS = -no-undefined
More details about this in the LT_INIT documentation.
来源：https://stackoverflow.com/questions/17487891/libtool-undefined-symbols-not-allowedin-i686-pc-mingw32-shared