shared c++ lib on powerpc-ibm-aix4.1.5.0. Done by hand!

[Paul Maragakis]

> 
> 
>   In message < 9712051744.AA39970@mpqibmr1.mpq.mpg.de >you write:
>   > Hello,
>   > 
>   > I reinstalled egcs with shared enabled.  Plenty of unexpected things
>   > this time!  In the end you find a summary of all regression test
>   > failures.  By inspection of the log files, it seems that standard c++
>   > streams cannot be linked!
> It could be the problem mentioned in ths faq entry:
> 
> http://www.cygnus.com/egcs/faq.html#rpath
> jeff
> 

Hello,

What follows refers to AIX 4.1.5, and egcs-1.0.  It will interest you.

I could install the shared c++ library on AIX by hand.  Since it is my
first attempt with creating shared libraries on AIX, it is a hack.
Result is beautiful!  A test executable size dropped to 10 KB
unstripped, and 2.3 KB stripped, which makes it smaller than the
corresponding xlC compiler size (6 KB stripped).  By briefly going
through the egcs build output, I decided that the library was not
build correctly.  I checked AIX instructions on how to do a shared
library, and this is what I did:

Get a list of the exported symbols:

cd objdir/libraries/libstdc++/
for i in `cat piclist`; do \
nm -BChg $i | grep " D " | cut -c14- >> libnewstdc++.exp; \
done 

Link the shared object:

ld -o libnewstdc++.so `cat piclist` -bE:libnewstdc++.exp -bM:SRE \
-lm -L [path to egcs gcc library ...gcc-lib/powerpc-ibm... ]
-lgcc -lc

Put into an archive so that linking goes with normal procedures:

ar qv libnewstdc++.a libnewstdc++.so

then put the libnewstdc++.a into your egcs library directory, and
compile and link the usual way:

//##### Example file hello.C
#include <iostream.h>
int main()
{
        cout << "Hello world!" << endl;
        return 0;
}

egcs-path/c++ -c hello.C -o hello.o
gives:
-rw-r--r--   1 plm      mpq00       1290 Dec  8 13:50 hello.o

egcs-path/c++ -o hello hello.o -lnewstdc++
gives:
-rwxr-xr-x   1 plm      mpq00       9087 Dec  8 13:52 hello

strip hello
gives:
-rwxr-xr-x   1 plm      mpq00       2240 Dec  8 13:52 hello

./hello
gives:
Hello world!

compare these to the egcs static sizes:
-rwxr-xr-x   1 plm      mpq00     693141 Dec  8 14:05 hello.o
-rwxr-xr-x   1 plm      mpq00     693257 Dec  8 14:06 hello
-rwxr-xr-x   1 plm      mpq00     146462 Dec  8 14:07 hello  (stripped)

and xlC sizes:
-rw-r--r--   1 plm      mpq00       1518 Dec  8 14:07 hello.o
-rwxr-xr-x   1 plm      mpq00      10470 Dec  8 14:08 hello
-rwxr-xr-x   1 plm      mpq00       6042 Dec  8 14:08 hello  (stripped)

Hope somebody can formalize and optimize the above procedure to put it
into the real distribution (I really have no time till New Year!).  I
will try the testsuite with the new library late at night (European
time), and report the results soon.  Any quick idea on the minimum
changes needed are appreciated (I guess just substituting the build
directory library with the new library should do).

Since I am still not on the egcs list, please cc me on any
answers/comments.

Keep up your incredible work!

-- 
Paul