-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2/15/2011 06:22, Dock, Dion wrote: > I've produced a library built with MinGW64 that can be compiled and linked by > MinGW64. However, when someone tries to link it in a Cygwin environment, > they get errors about a missing function: > > foo.o:foo.cpp:(.text+0xfa8): undefined reference to > `__imp__MapFileAndCheckSumA@12' > > This function is supplied via the Windows Platform SDK in > ImageHlp.lib/ImageHlp.dll. > > I've tried to statically bind in ImageHlp.lib but the symbol isn't there: > > x86_64-w64-mingw32-gcc.exe -c foo.cpp > x86_64-w64-mingw32-nm.exe foo.o | find "Map" > U __imp_MapFileAndCheckSumA > x86_64-w64-mingw32-gcc.exe -c foo.cpp -L \temp\mingw_64 -lImageHlp > x86_64-w64-mingw32-nm.exe foo.o | find "Map" > U __imp_MapFileAndCheckSumA > > Any thoughts on how I can build my library to resolve this dependency? Would > creating an export library do the trick? > > thanks, > -Dion >
Hi, there are several problems that may have occurred. 1. The user forgot to use -limagehlp to link, or link command is incorrect. 2. The user is using an ancient mingw/cygwin installation, recent Cygwin w32api and mingw-w64 libimagehlp.a comes with __imp__MapFileAndCheckSumA@12. 3. You tried to use static MSVC ImageHlp.lib. You can't use that if you are using dllimport, as evident from the __imp_ prefix. Furthermore, you should use the provided libimagehlp.a that comes with mingw-w64. I hope that helps, but its just educated guesses until more information is available. Some information about the exact user link command and details of the development environment would be nice. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.16 (MingW32) iEYEARECAAYFAk1Zyl8ACgkQp56AKe10wHfQqgCeIl8dh5xTgRKWiYrZtmMcQoeL 3dsAn2MOG6uFrbjGn8pWweTVRygAfm07 =w+MP -----END PGP SIGNATURE-----
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