[Bug lto/42690] Undefined reference errors with -flto -fuse-linker-plugin

[espindola at gcc dot gnu dot org]

------- Comment #5 from espindola at gcc dot gnu dot org  2010-01-15 03:54 -------
Note that
-plugin-opt=-pass-through=/foo/bar/libgcc.a
is missing in the linker invocation.

That is the problem. When BUG is not defined, the undefined reference is
visible early on. You can check that with

GNUTARGET=plugin nm --prugin ..../libltoplugin.so foo.o

If BUG is defined the plugin will not see a call since it will only created by
codegen. That is why the driver asks the linker to take a second look at some
libraries by passing the pass-through option.

We have to figure out a better way to detected in gcc.c that libgcc (and/or
libc) will be linked statically.

H.J.Lu: You are probably linking with a shared libgcc, no?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42690