Bug#617751: ocaml-soundtouch: Shouldn't link against stdc++

2011-03-11 Thread Cyril Brulebois 
Hi,

Stéphane Glondu glo...@debian.org (11/03/2011):
 So you mean that by using some specific library, one should change
 linker?

no, I mean that by using the C++ programming language, you're supposed
to link using g++.

 Doesn't sound right to me... Do you have any reference that
 explains why linking to -lstdc++ without g++ is bad practice? I've
 already heard of that, but couldn't find any decent explanation.

Because it's not guaranteed to work. Example:
| $ cat foo.cpp
| #include iostream
| 
| using namespace std;
| 
| int main(void) {
|   cout  Hello world!  endl;
|   return 0;
| }

| $ g++ -c foo.cpp -o foo.o

| $ ld -lstdc++ foo.o -o foo
| ld: cannot find -lstdc++

Both work, with the intermediate target:
| g++ foo.o -o foo

or directly:
| $ g++ foo.cpp -o foo

http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html also suggests you
should be using g++ to link (see -static-*).

KiBi.


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Bug#617751: ocaml-soundtouch: Shouldn't link against stdc++

2011-03-11 Thread Romain Beauxis 
2011/3/11 Cyril Brulebois k...@debian.org:
 Hi,

 Stéphane Glondu glo...@debian.org (11/03/2011):
 So you mean that by using some specific library, one should change
 linker?

 no, I mean that by using the C++ programming language, you're supposed
 to link using g++.

 Doesn't sound right to me... Do you have any reference that
 explains why linking to -lstdc++ without g++ is bad practice? I've
 already heard of that, but couldn't find any decent explanation.

 Because it's not guaranteed to work. Example:
 | $ cat foo.cpp
 | #include iostream
 |
 | using namespace std;
 |
 | int main(void) {
 |   cout  Hello world!  endl;
 |   return 0;
 | }

 | $ g++ -c foo.cpp -o foo.o

 | $ ld -lstdc++ foo.o -o foo
 | ld: cannot find -lstdc++

 Both work, with the intermediate target:
 | g++ foo.o -o foo

 or directly:
 | $ g++ foo.cpp -o foo

 http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html also suggests you
 should be using g++ to link (see -static-*).

That sounds like a big headache for OCaml: native code generated by
OCaml are bundled together at link-time. For instance, in Liquidsoap,
where ocaml-soundtouch is used, we use C and C++ code for the
bindings.

Therefore, there is no reason to use g++ to link the final binary...
Do you have any idea concerning this situation?

Romain

 KiBi.

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Bug#617751: ocaml-soundtouch: Shouldn't link against stdc++

2011-03-10 Thread Cyril Brulebois 
Source: ocaml-soundtouch
Version: 0.1.6-1
Severity: normal

Hi,

noticed “thanks” to a buildd glitch (g++ missing):
| /usr/bin/ocamlc -c soundtouch.mli
| /usr/bin/ocamlc -c soundtouch.ml
| ocamlmklib  -L/usr/lib   \
| -o soundtouch_stubs  soundtouch_stubs.o 
-lSoundTouch -lstdc++  \
| 
| /usr/bin/ld: cannot find -lstdc++

Last I checked, one links C++ code through g++, not through ld …
-lstdc++. You may want to investigate that.

KiBi.



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Bug#617751: ocaml-soundtouch: Shouldn't link against stdc++

2011-03-10 Thread Stéphane Glondu 
Le 11/03/2011 05:43, Cyril Brulebois a écrit :
 noticed “thanks” to a buildd glitch (g++ missing):
 | /usr/bin/ocamlc -c soundtouch.mli
 | /usr/bin/ocamlc -c soundtouch.ml
 | ocamlmklib  -L/usr/lib   \
 | -o soundtouch_stubs  soundtouch_stubs.o 
 -lSoundTouch -lstdc++  \
 | 
 | /usr/bin/ld: cannot find -lstdc++
 
 Last I checked, one links C++ code through g++, not through ld …
 -lstdc++. You may want to investigate that.

So you mean that by using some specific library, one should change
linker? Doesn't sound right to me... Do you have any reference that
explains why linking to -lstdc++ without g++ is bad practice? I've
already heard of that, but couldn't find any decent explanation.


Cheers,

-- 
Stéphane




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