• lili (45/45) Aug 22 2019 Hi
• David Nadlinger (10/15) Aug 22 2019 These are software implementations of integer arithmetic where the
• lili (3/18) Aug 22 2019 Thanks a lot.

lili <akozhao tencent.com> writes:

Hi
   I writing a OS in D, compile with -betterC -c, but when call a 
variable template function
   where has __udivdi3  __umoddi3 undefined symbol, can not link 
with ld,  how to resolve it.
   see code below
println('it is ok');
println('it is occur -_udivdi3 symbol', 33);

  void println(A...)(A a)
     {
         char[20] numStr = void;

         import std.traits;
         foreach(v ; a) {
             alias UV = Unqual!(typeof(v));
             static if (is(UV == char)) putc(v);
             else static if (is(UV == char*)) puts(v);
             else static if (is(typeof(v) == string)) puts(v.ptr);
             else static if (is(UV == bool)) puts(v ? 
"true":"false");
             else static if (is(UV == byte)  || is(UV == ubyte) ||
                      is(UV == short) || is(UV == ushort) ||
                      is(UV == int)   || is(UV == uint) ||
                      is(UV == long)  || is(UV == ulong))
             {

                 ulong n = cast(ulong)v;
                 bool isNeg = false;
                 if (v < 0) {
                     isNeg = true;
                     if (n != 1UL<<63)
                         n = -v;
                 }

                 int i=0;
                 while(n !=0 ) {
                     numStr[i++] = (n%10) + '0';
                     n/=10;
                 }

                 if (isNeg)
                     putc('-');

                 while (--i >= 0)
                     putc(numStr[i]);
             }
             else
                 static assert(false);
         }
     }

"David Nadlinger" <code klickverbot.at> writes:

Hi there,

On 22 Aug 2019, at 21:20, lili via digitalmars-d-ldc wrote:
   I writing a OS in D, compile with -betterC -c, but when call a 
 variable template function
   where has __udivdi3  __umoddi3 undefined symbol, can not link with 
 ld,  how to resolve it.
   see code below

These are software implementations of integer arithmetic where the 
desired operation is not natively available on the target CPU (e.g. 64 
bit integer division on a 32 bit target).

You can find an implementation in the compiler-rt project (or libgcc), 
which you can link into your kernel as needed. You might be able to get 
around this by not using 64 bit integers in your code if 32 bits 
suffice.

  — David

lili <akozhao tencent.com> writes:

On Thursday, 22 August 2019 at 20:39:32 UTC, David Nadlinger 
wrote:
 Hi there,

 On 22 Aug 2019, at 21:20, lili via digitalmars-d-ldc wrote:
   I writing a OS in D, compile with -betterC -c, but when call 
 a variable template function
   where has __udivdi3  __umoddi3 undefined symbol, can not 
 link with ld,  how to resolve it.
   see code below

 These are software implementations of integer arithmetic where 
 the desired operation is not natively available on the target 
 CPU (e.g. 64 bit integer division on a 32 bit target).

 You can find an implementation in the compiler-rt project (or 
 libgcc), which you can link into your kernel as needed. You 
 might be able to get around this by not using 64 bit integers 
 in your code if 32 bits suffice.

  — David

Thanks a lot.