Re: 3 aap suggestions

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On Tue, Nov 29, 2005 at 11:15:10AM +0100, Bram Moolenaar wrote:
> 
> Pavol Juhas wrote:
> 
> > > > ...
> > > > > > > > (1) aap is not using correct linker when linking c++ objects.
> > > > ...
> > > > > > > > Can this be fixed so that aap uses g++ as a linker when linking
> > > > > > > > c++ objects?
> > > 
> > > [...]
> > > 
> > > > A simpler way of telling aap to use g++ to link from hello.o is 
> > > > to add "LD=$CXXSHLINK" to main.app.
> > > 
> > > Yes, but then all programs will use that linker.  It would be nice if
> > > you can build both C and C++ programs automatically.
> > 
> > For sure it would.  Well, I found another mystery - for main.aap with
> >     LD=$CXX
> >     :program hello : hello.cpp
> > the object-build works (aap; rm hello; aap), but if I add :usetool gcc
> > to the begining, object-build stops working (clean build works).
> > That happens with both the original and patched usetool.  
> 
> What is the problem then?

Step by step reproduction - when main.aap contains

    :usetool gcc
    LD=$CXX
    :program hello : hello.cpp 

clean build works

    aap clean
    aap

but object build does not (which is the problem)

    rm hello
    aap

If you remove the :usetool line in main.aap, both builds 
would work.  It seems :usetool is somehow breaking the object build 
procedure.  Attached is the hello.cpp file if you'd like to test the 
problem.

> 
> If setting both $LD and ":usetool gcc", what would the writer of the
> recipe have intended?  I would guess he wants to use gcc but with a
> different linker.

LD=$CXX  means that user wants to link with whatever is the 
c++ compiler for the selected tool.  It would be useful for 
a project where all the files are c++, but which may be compiled 
with different tools, e.g., gcc, icc, msvc.  In that case the 
usetool line would be replaced with ":toolsearch gcc icc msvc".

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#include <iostream>
int main()
{
    std::cout << "hello world" << std::endl;
    return EXIT_SUCCESS;
}

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