Re: [fpc-pascal] USB Human Interface Devices

[Jean SUZINEAU]

Static linking : Le 05/08/2019 à 21:38, Johann Glaser a écrit : Referring to your EMail to James, it seems that Vitaly even got it working with static linking. Especially "$LINKLIB msvcrt" and "$LINKLIB usb-1.0.dll.a" look promising. Hmm, OTOH he writes of dynamically linked, I don't know. Could you please also have a look at his comments in that Github issue? For now I couldn't achieve static linking. I couldn't find a reliable way to find the dependencies of libusb-1.0 on other libraries, may be I would have to dig into the makefile and autoconf files of libusb sources, but it seems difficult. I used MSYS2 (https://www.msys2.org/) in which I installed the following packages: pacman -S mingw64/mingw-w64-x86_64-libusb pacman -S mingw-w64-x86_64-headers-git pacman -S mingw-w64-x86_64-crt-git pacman -S mingw-w64-x86_64-gcc In LibUsb.pas I changed the $LINKLIBs to (the errors removed by a particular $LINKLIB are after //Error: ) : {$LINKLIB usb-1.0} {$ifdef windows} {$LINKLIB mingwex} //Error: Undefined symbol: __mingw_vsnprintf, __mingw_vsprintf, __mingw_vsscanf //{$LINKLIB mingw32} //doesn't improve anything {$LINKLIB kernel32} // Error: Undefined symbol: __imp_TlsGetValue, __imp_EnterCriticalSection, __imp_LeaveCriticalSection, ... +41 others {$LINKLIB advapi32} // Error: Undefined symbol: __imp_OpenSCManagerA, __imp_OpenServiceA, __imp_CloseServiceHandle //{$LINKLIB winpthread} //doesn't improve anything //{$LINKLIB stdc++} //doesn't improve anything {$LINKLIB gcc} //Error: Undefined symbol: ___chkstk_ms {$LINKLIB crtdll} //Error: malloc, memcpy, ... + 37 others //{$LINKLIB msvcrt} //same as crtdll, Error: malloc, memcpy, ... + 37 others{$else} {$LINKLIB c} {$endif} Here are the errors of the compilation, it's the minimu I could obtain: Hint: (11030) Start of reading config file C:\lazarus\fpc\3.0.4\bin\x86_64-win64\fpc.cfg Hint: (11031) End of reading config file C:\lazarus\fpc\3.0.4\bin\x86_64-win64\fpc.cfg Free Pascal Compiler version 3.0.4 [2019/02/03] for x86_64 Copyright (c) 1993-2017 by Florian Klaempfl and others (1002) Target OS: Win64 for x64 (3104) Compiling test1library.pas (9015) Linking E:\03_travail\libusb\pas-libusb\src\examples\test1library.exe Error: Multiple defined symbol .refptr.usbi_backend Error: Multiple defined symbol .refptr.usbi_backend Error: Multiple defined symbol .refptr.usbi_default_context Error: Multiple defined symbol .refptr.INVALID_WINFD Error: Multiple defined symbol .refptr.pCancelIoEx Error: Multiple defined symbol .refptr.__tens_D2A Error: Multiple defined symbol .refptr.__hexdig_D2A Error: Undefined symbol: atexit Fatal: (10026) There were 8 errors compiling module, stopping Fatal: (1018) Compilation aborted Error: C:\lazarus\fpc\3.0.4\bin\x86_64-win64\ppcx64.exe returned an error exitcode

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