June 04, 2005 boxer linking difficulties | ||||
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I'm having trouble using std.boxer in code compiled into a lib. I've recompiled phobos with all the debugging info I could and it was still giving a link error not finding an unbox instantiation. The following two files give an example boxt.d: import boxt2; int main() { double x = foo!(double)(10); printf("%g\n",x); return 0; } boxt2.d: module boxt2; import std.boxer; template foo(T) { T foo(int x){ return unbox!(T)(box(x)); } } This works fine if you compile like dmd boxt.d boxt2.d but it fails to link if you do dmd -c boxt2.d dmd boxt.d boxt2.obj With MinTL I'm using boxes to do implicit numeric conversions but since MinTL is a library I compile everything down to objs and stuff them in a lib. Hence I found the simplest thing for me to do is insert some dead code into the code using MinTL to explicitly instatiate the right unbox function. eg boxt.d: import boxt2; import boxer; int main() { unbox!(double)(box(10)); // dead code to get the template instantiated double x = foo!(double)(10); printf("%g\n",x); return 0; } I vaguely remember some discussions about instantiating templates across obj files but I don't remember what the upshot was. |
June 04, 2005 Re: boxer linking difficulties | ||||
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Posted in reply to Ben Hinkle | Ben, I have same problems with boxer. Have not fixed them. "Solution" - I am not assembling lib from objs at all. AFAIR - problem is exactly the same as with any template in debug mode. Librarian just don't like them. Andrew. "Ben Hinkle" <ben.hinkle@gmail.com> wrote in message news:d7r7kb$1rnj$1@digitaldaemon.com... > I'm having trouble using std.boxer in code compiled into a lib. I've > recompiled phobos with all the debugging info I could and it was still > giving a link error not finding an unbox instantiation. The following two > files give an example > boxt.d: > import boxt2; > int main() { > double x = foo!(double)(10); > printf("%g\n",x); > return 0; > } > > boxt2.d: > module boxt2; > import std.boxer; > template foo(T) { > T foo(int x){ return unbox!(T)(box(x)); } > } > > This works fine if you compile like > dmd boxt.d boxt2.d > but it fails to link if you do > dmd -c boxt2.d > dmd boxt.d boxt2.obj > With MinTL I'm using boxes to do implicit numeric conversions but since > MinTL is a library I compile everything down to objs and stuff them in a > lib. Hence I found the simplest thing for me to do is insert some dead > code into the code using MinTL to explicitly instatiate the right unbox > function. eg > boxt.d: > import boxt2; > import boxer; > int main() { > unbox!(double)(box(10)); // dead code to get the template instantiated > double x = foo!(double)(10); > printf("%g\n",x); > return 0; > } > I vaguely remember some discussions about instantiating templates across > obj files but I don't remember what the upshot was. > |
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