Re: Using a shared library to partly replace an archive library -ld changed behaviour

[Graham Hudspith <gwh at allinea dot com>]

H. J. Lu wrote:

> Can you try one thing for me?
>
> 1. Build and run your original test on RH9.
> 2. Send me your output on RH9.
> 3. Copy the binaries to FC3.
> 4. Run the same binaries, which are built on RH9, on FC3.
> 5. Send me your output on FC3.
>
>  
H. J. ,

   Thanks for your persistence. Here are the results of building and
   running my example under RH9:

[opt-testing@fender modified]$ make
gcc -B./ -O -g   -c -o main.o main.c
gcc -B./ -O -g -fPIC -c foo.c -o shared.o
gcc -B./ -shared -o libshared1.so shared.o
gcc -B./ -O -g -fPIC -c bar.c -o bar.o
ar rv libfoo.a bar.o
a - bar.o
gcc -B./ -o main1 main.o libshared1.so libfoo.a -Wl,-rpath,.
gcc -B./ -o main2 main.o libfoo.a
gcc -B./ -shared -o libshared3.so shared.o libfoo.a
gcc -B./ -o main3 main.o libshared3.so libfoo.a -Wl,-rpath,.
./main1
Shared library
Real bar
./main2
Real bar
./main3
Shared library
Real bar

   As you can, all three examples work correctly. Now, copying the
   binaries across to an FC3 system:

[gwh@snowball modified]$ make
./main1
Shared library
Real bar
./main2
Real bar
./main3
Shared library
Real bar

   So, the RH9 binaries execute correctly under FC3. Now to BUILD and
   run under FC3:

[gwh@snowball modified]$ make
gcc -B./ -O -g   -c -o main.o main.c
gcc -B./ -O -g -fPIC -c foo.c -o shared.o
gcc -B./ -shared -o libshared1.so shared.o
gcc -B./ -O -g -fPIC -c bar.c -o bar.o
ar rv libfoo.a bar.o
ar: creating libfoo.a
a - bar.o
gcc -B./ -o main1 main.o libshared1.so libfoo.a -Wl,-rpath,.
gcc -B./ -o main2 main.o libfoo.a
gcc -B./ -shared -o libshared3.so shared.o libfoo.a
gcc -B./ -o main3 main.o libshared3.so libfoo.a -Wl,-rpath,.
./main1
Real bar
./main2
Real bar
./main3
Shared library
Real bar

   You can see that the run of "main1" has failed.

   I've attached the source-code again, just so we know which set we
   are talking about.

   Regards,

       Graham.

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