[Bug ld/22962] [RISCV] add abi subdirectories support to ld

[belyshev at depni dot sinp.msu.ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=22962

--- Comment #9 from Serge Belyshev <belyshev at depni dot sinp.msu.ru> ---
(In reply to Jim Wilson from comment #8)
> If gcc is configured --enable-multilib, then it appears that you get the -L
> options you need for this to work.  If gcc is configured --disable-multilib,
> then you do not get the -L options needed for this to work.
> 
> Is your gcc configured --disable-multilib?

Indeed my gcc configured with --disable-multilib.

Hovewer, I see that relevant directories appear in the LIBRARY_PATH and thus on
the ld command line.  And moreover, adding -L/lib64/lp64d   manually on gcc
command line does not fix the problem.  See relevalnt parts of the output:

$ gcc f2.c -o f2   -L/lib64/lp64d -L/usr/lib64/lp64d f1.so  -v -Wl,--verbose
...
LIBRARY_PATH=/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1/:/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1/../../../../riscv64-unknown-linux-gnu/lib/:/lib64/lp64d/:/usr/lib64/lp64d/:/lib/:/usr/lib/
...
/usr/libexec/gcc/riscv64-unknown-linux-gnu/7.3.1/collect2 -plugin
/usr/libexec/gcc/riscv64-unknown-linux-gnu/7.3.1/liblto_plugin.so
-plugin-opt=/usr/libexec/gcc/riscv64-unknown-linux-gnu/7.3.1/lto-wrapper
-plugin-opt=-fresolution=/tmp/cc0RVYrX.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s
--eh-frame-hdr -melf64lriscv -dynamic-linker /lib/ld-linux-riscv64-lp64d.so.1
-o f2 /usr/lib64/lp64d/crt1.o
/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1/crti.o
/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1/crtbegin.o
-L/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1
-L/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1/../../../../riscv64-unknown-linux-gnu/lib
-L/lib64/lp64d -L/usr/lib64/lp64d /tmp/ccYKxfmX.o f1.so --verbose -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1/crtend.o
/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1/crtn.o
...
SEARCH_DIR("/usr/riscv64-unknown-linux-gnu/lib64");
SEARCH_DIR("/usr/local/lib64"); SEARCH_DIR("/lib64"); SEARCH_DIR("/usr/lib64");
SEARCH_DIR("/usr/riscv64-unknown-linux-gnu/lib"); SEARCH_DIR("/usr/local/lib");
SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib");
...
/usr/lib/gcc/riscv64-unknown-linux-gnu/7.3.1/../../../../riscv64-unknown-linux-gnu/bin/ld:
warning: libm.so.6, needed by f1.so, not found (try using -rpath or
-rpath-link)

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