Więc jest mnóstwo informacji o wywoływaniu C API z wnętrza D, ale co z odwrotnością? Co musisz zrobić, aby napisać bibliotekę w D, która działa jak normalna biblioteka współdzielona C? Oto prosty przypadek:Implementacja C API w D
main.c
extern int foo(int x);
void main() {
printf("foo(5)=%d\n",foo(5));
}
foo.d
extern(C)
{
int foo(int x)
{
return x*x;
}
}
naiwnie próbuje budować i łączyć je z gcc i DMD tylko powoduje błędy linkera.
Powiązanie z gcc main.o foo.o:
doFoo.o: In function `no symbol':
doFoo.d:(.text+0x7): undefined reference to `_Dmodule_ref'
collect2: ld returned 1 exit status
Powiązanie z DMD main.o foo.o:
/usr/lib64/libphobos2.a(deh2_2eb_525.o): In function `_D2rt4deh213__eh_finddataFPvZPS2rt4deh213DHandlerTable':
src/rt/deh2.d:(.text._D2rt4deh213__eh_finddataFPvZPS2rt4deh213DHandlerTable+0xa): undefined reference to `_deh_beg'
src/rt/deh2.d:(.text._D2rt4deh213__eh_finddataFPvZPS2rt4deh213DHandlerTable+0x14): undefined reference to `_deh_beg'
src/rt/deh2.d:(.text._D2rt4deh213__eh_finddataFPvZPS2rt4deh213DHandlerTable+0x1e): undefined reference to `_deh_end'
src/rt/deh2.d:(.text._D2rt4deh213__eh_finddataFPvZPS2rt4deh213DHandlerTable+0x46): undefined reference to `_deh_end'
/usr/lib64/libphobos2.a(lifetime.o): In function `_D2rt8lifetime18_sharedStaticCtor9FZv':
src/rt/lifetime.d:(.text._D2rt8lifetime18_sharedStaticCtor9FZv+0x15): undefined reference to `_tlsend'
src/rt/lifetime.d:(.text._D2rt8lifetime18_sharedStaticCtor9FZv+0x29): undefined reference to `_tlsstart'
/usr/lib64/libphobos2.a(thread_a3_258.o): In function `_D4core6thread6Thread6__ctorMFPFZvmZC4core6thread6Thread':
src/core/thread.d:(.text._D4core6thread6Thread6__ctorMFPFZvmZC4core6thread6Thread+0x2b): undefined reference to `_tlsend'
src/core/thread.d:(.text._D4core6thread6Thread6__ctorMFPFZvmZC4core6thread6Thread+0x36): undefined reference to `_tlsstart'
/usr/lib64/libphobos2.a(thread_a3_258.o): In function `_D4core6thread6Thread6__ctorMFDFZvmZC4core6thread6Thread':
src/core/thread.d:(.text._D4core6thread6Thread6__ctorMFDFZvmZC4core6thread6Thread+0x28): undefined reference to `_tlsend'
src/core/thread.d:(.text._D4core6thread6Thread6__ctorMFDFZvmZC4core6thread6Thread+0x33): undefined reference to `_tlsstart'
/usr/lib64/libphobos2.a(thread_a3_258.o): In function `_D4core6thread6Thread6__ctorMFZC4core6thread6Thread':
src/core/thread.d:(.text._D4core6thread6Thread6__ctorMFZC4core6thread6Thread+0x26): undefined reference to `_tlsend'
src/core/thread.d:(.text._D4core6thread6Thread6__ctorMFZC4core6thread6Thread+0x31): undefined reference to `_tlsstart'
/usr/lib64/libphobos2.a(thread_a0_713.o): In function `thread_entryPoint':
src/core/thread.d:(.text.thread_entryPoint+0x36): undefined reference to `_tlsend'
src/core/thread.d:(.text.thread_entryPoint+0x41): undefined reference to `_tlsstart'
collect2: ld returned 1 exit status
--- errorlevel 1
Um, nie zostawiaj nas nachylona ... jakie są błędy? – Mehrdad
Błędy łącznika to: 'foo.o: W funkcji 'brak symbolu': foo.d :(. Tekst + 0x7): niezdefiniowane odwołanie do '_Dmodule_ref'' –