[Bug binutils/12549] --as-needed should ignore weak references

[rose.garcia-eggl2fk at yopmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=12549

Rose Garcia <rose.garcia-eggl2fk at yopmail dot com> changed:

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--- Comment #18 from Rose Garcia <rose.garcia-eggl2fk at yopmail dot com> ---
Created attachment 7198
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7198&action=edit
as-needed patch for binutils 2.23.2

as of binutils 2.23.2, this issue still exists

gcc 4.5.4, 4.7.3 (and probably all others as well) fail to build during target
library compilation because libgcc_s.so.1 is getting used unconditionally,
despite --as-needed being passed.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58427

if libgcc_s.so happens to be installed already, this bug will go unnoticed.
in my case, the first gcc is built with --disable-shared, so no libgcc_s.so is
installed.

applying an extract of the original patch makes the gcc compilation error (and
the inclusion of libgcc_s) go away.

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