[Bug ld/21964] __start_SCN symbols aren't exported anymore

[matz at suse dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=21964

--- Comment #6 from Michael Matz <matz at suse dot de> ---
Created attachment 10354
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10354&action=edit
tarball with testcase

Here is one.  Unlike libqb it's not using dl_iterate_phdr and then dlopen with
the known name to get the shared lib, but instead dlopen directly, but that
doesn't matter here.

It's supposed to be extracted inside the binutils build directory, it calls
../ld/ld-new directly.  I.e.:

% cd build
% tar xvf orphan.tar.gz && cd orphan
% make
gcc -o app app.c -ldl
gcc -c -fPIC -o lib.o lib.c
/usr/bin/ld -shared -o liborphan.so lib.o
./app && echo okay
okay
../ld/ld-new -shared -o liborphan.so lib.o
./app
can't find __start___verbose
make: *** [failing] Error 2
% 

The above happens when the system /usr/bin/ld is still pre-2.29.  With the
patch
it's:

% make
/usr/bin/ld -shared -o liborphan.so lib.o
./app && echo okay
okay
../ld/ld-new -shared -o liborphan.so lib.o
./app
%

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