[Bug ld/31904] New: libdep.so plugin does not register search path in bfd linker

[me at harmenstoppels dot nl]

https://sourceware.org/bugzilla/show_bug.cgi?id=31904

            Bug ID: 31904
           Summary: libdep.so plugin does not register search path in bfd
                    linker
           Product: binutils
           Version: 2.42
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: me at harmenstoppels dot nl
  Target Milestone: ---

I've created two static libraries `f/libf.a` and `g/libg.a`. The first
registers a dependency on the second: `-L/path/to/g -lg` using the following
command:

    ar crl '-L/path/to/g -lg' f/libf.a f/f.o

Then I link my main program again libf using `-Lf -lf` and expect that the
linker locates and links libg.a too.

This fails for the default linker ld.bfd from binutils 2.36 to latest.

It succeeds with the gold linker.

Here is a self-contained minimal example as Makefile:

> LDFLAGS := -Wl,--plugin,/usr/lib/x86_64-linux-gnu/bfd-plugins/libdep.so
> 
> .PHONY: all clean
> 
> all: exe
> 
> f/f.o:
>       mkdir -p f
>       printf 'extern int g(); int f(){ return g(); }' | $(CC) -c -xc - -o $@
> 
> f/libf.a: f/f.o g/libg.a
>       $(AR) crl '-L$(CURDIR)/g -lg' $@ $<
> 
> g/g.o:
>       mkdir -p g
>       printf 'int g(){ return 4; }' | $(CC) -c -xc - -o $@
> 
> g/libg.a: g/g.o
>       $(AR) cr $@ $<
> 
> exe: f/libf.a
>       printf 'extern int f(); int main() { return f(); }' | $(CC) $(LDFLAGS) 
> -xc - -o $@ -Lf -lf
> 
> clean:
>       rm -f exe f/f.o f/libf.a g/g.o g/libg.a


Run make and it outputs


> mkdir -p f
> printf 'extern int g(); int f(){ return g(); }' | cc -c -xc - -o f/f.o
> mkdir -p g
> printf 'int g(){ return 4; }' | cc -c -xc - -o g/g.o
> ar cr g/libg.a g/g.o
> ar crl '-L/tmp/tmp.iR9g9xEukO/g -lg' f/libf.a f/f.o
> printf 'extern int f(); int main() { return f(); }' | cc 
> -Wl,--plugin,/usr/lib/x86_64-linux-gnu/bfd-plugins/libdep.so -xc - -o exe -Lf 
> -lf
> got deps for library f/libf.a: -L/tmp/tmp.iR9g9xEukO/g -lg
> /usr/bin/ld: f/libf.a(f.o): in function `f':
> <stdin>:(.text+0xe): undefined reference to `g'
> collect2: error: ld returned 1 exit status
> make: *** [Makefile:22: exe] Error 1

So, it fails to register `-L/tmp/tmp.iR9g9xEukO/g` as a link dir.

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