On 14.10.2015 13:46, ZombineDev wrote:
On Tuesday, 13 October 2015 at 20:10:22 UTC, Rainer Schuetze wrote:
Yes, but there is some magic involved when linking against the VS2015
CRT. To use symbols like snprintf and sscanf, you must also pass
legacy_stdio_definitions.lib to the linker, which is done
automatically if you use dmd as a frontend to the linker, but not cl.
Symbols _minfo_beg, _minfo_end, _deh_beg and _deh_end are only emitted
by the compiler if you compile main, WinMain or DllMain.
Unfortunately, compiling D's main also generates a C-style main, so
it's not so easy to get these symbols if you need main in C/C++.
I would currently recommend to write main in D, and call into C/C++
from there.
Thanks for the answer.
Just for the reference, under VS2015 x86 Native Tools Command Prompt I
tried to link a C++ main function that only calls rt_init() and
rt_term() like this:
cl main.cpp C:\D\dmd2\windows\lib32mscoff\phobos32mscoff.lib "C:\Program
Files (x86)\Microsoft Visual Studio
14.0\VC\lib\legacy_stdio_definitions.lib"
I got:
main.cpp
phobos32mscoff.lib(sections_win64_6de_5a5.obj) : error LNK2019:
unresolved external symbol __minfo_beg referenced in function
_D2rt14sections_win6414getModuleInfosFZAyPS6object10ModuleInfo
phobos32mscoff.lib(sections_win64_6de_5a5.obj) : error LNK2019:
unresolved external symbol __minfo_end referenced in function
_D2rt14sections_win6414getModuleInfosFZAyPS6object10ModuleInfo
main.exe : fatal error LNK1120: 2 unresolved externals
Which, based on your answer, is expected.
I'm looking into integrating D into an existing C++ build and I need to
statically link the D library. So my next questions are:
1) Where can I find legacy_stdio_definitions.lib?
P.S.: It's included in VS (C:\Program Files (x86)\Microsoft Visual
Studio 14.0\VC\lib\legacy_stdio_definitions.lib)
Your C++ project should have the library paths setup correctly to find
it if you just add it to the additional input libraries.
2) How can I workaround the problem that _minfo* and _deh* are not
generated because my main is in C++?
As Szymon noticed, you can compile an empty main into the static D
library. The additional C main that is generated by DMD won't cause
ambiguities as long as your C main is not also in a static library.
