Mingw-w64 Unable to link version library
For an open windows source-project to be built with Mingw-w64 I figured, it was nice, if the application was conscious of its version.
To get this, I copied/pastes/edited a small wrapper, which would read the version-information from the application’s own resources. This code builds well, when being done with Visual Studio environment (using vcvars32.bat).
However, when I try to build it with MinGw, the compiler runs through nicely, but the linker does not. There’s an error, that a functions from the version.dll is not found:
VersSample.cpp:(.text+0x14f): undefined reference to VerQueryValueW
I did add the –lversion compiler-switch in the build-command-line, but it appears, not to work. Anybody a hint, what I am missing?
The build-command looks as follows:
set PATH=C:\Tools\MinGw\mingw64\bin\;%PATH%
windres VersSample.rc -O coff -o VersSample.res
g++ -o VersSample.exe -mwindows -static-libgcc -static-libstdc++ -lversion VersSample.cpp VersSample.res
BTW: I did not want to make this bigger as needed, but if there's some nterest, I could post the whole function.
1 answer
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answered 2018-10-12 18:26
Jay.Dee.S
Gosh, I got it.
I can't tell why, but the postition of the -lversion seemed to be of importance. I placed it at the end of the g++ call, and it worked:g++ -o VersSample.exe -mwindows -static-libgcc -static-libstdc++ VersSample.cpp VersSample.res -lversion
For anyone interested, the whole function looks as follows:
void AddVersionInfo(WCHAR* pszwOutput, const WCHAR* pszwEntry) { /** Variables: */ DWORD vLen, langD; BOOL retVal; LPVOID retbuf = NULL; WCHAR fileEntry[256]; /** Fetch-Code: */ HRSRC hVersion = FindResource(NULL, MAKEINTRESOURCE(VS_VERSION_INFO), RT_VERSION); if (hVersion != NULL) { HGLOBAL hGlobal = LoadResource(NULL, hVersion); if (hGlobal != NULL) { LPVOID versionInfo = LockResource(hGlobal); if (versionInfo != NULL) { swprintf(fileEntry, L"\\VarFileInfo\\Translation"); retVal = VerQueryValue(versionInfo, fileEntry, &retbuf, (UINT *)&vLen); if (retVal && vLen == 4) { memcpy(&langD, retbuf, 4); #ifdef _MSC_VER swprintf(fileEntry, L"\\StringFileInfo\\%02X%02X%02X%02X\\%s", (langD & 0xff00) >> 8, langD & 0xff, (langD & 0xff000000) >> 24, (langD & 0xff0000) >> 16, pszwEntry); #else swprintf(fileEntry, L"\\StringFileInfo\\%02X%02X%02X%02X\\%S", (langD & 0xff00) >> 8, langD & 0xff, (langD & 0xff000000) >> 24, (langD & 0xff0000) >> 16, pszwEntry); #endif }else{ swprintf(fileEntry, L"\\StringFileInfo\\%04X04B0\\%s", GetUserDefaultLangID(), pszwEntry); } if (VerQueryValue(versionInfo, fileEntry, &retbuf, (UINT *)&vLen)) { wcscat(pszwOutput, (WCHAR*)retbuf); } } } UnlockResource(hGlobal); FreeResource(hGlobal); }
}
Note, that I had to add a compiler-switch to distinguish between the MS VS and the MinGw environment, since they appear to handle markers in sprintf (resp. swprintf) differently.
With this, given that a complete VersionInfo block is in the ressources, the data can be accessed and used as:
AddVersionInfo(buffer, L"FileVersion");