[Bug ld/24873] gcc -flto objects result in --start-group … --end-group failure to include --as-needed libraries

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24873

--- Comment #9 from Alan Modra <amodra at gmail dot com> ---
> At https://mail.aegee.org/dpa/ld24873/

Thanks, and nicely included your libcheck.a, which contains the LTO objects
triggering this bug.  After building myself a new gcc-8 (debugging LTO linker
problems requires using the same compiler) I was able to reproduce the problem
with current master binutils, and binutils-2.32.  For future reference, this
was the linker invocation I used:  (prev-gcc because gcc was still
bootstrapping!)

COLLECT_GCC=/home/alan/build/gcc-8/prev-gcc/xgcc
COLLECT_GCC_OPTIONS="'-B/home/alan/build/gcc-8/prev-gcc/' '-o' 'test-utils'
'-O2' '-g' '-pthread' '-v' '-save-temps' '-mtune=generic' '-march=x86-64'"
~/build/gas/all/ld/ld-new -plugin ~/build/gcc-8/prev-gcc/liblto_plugin.so
-plugin-opt=/home/alan/build/gcc-8/prev-gcc/lto-wrapper
-plugin-opt=-fresolution=test-utils.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lpthread
-plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s --sysroot=/ --build-id --eh-frame-hdr -m
elf_x86_64 --hash-style=gnu --as-needed -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -o test-utils /usr/lib/x86_64-linux-gnu/crt1.o
/usr/lib/x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/8/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/8 -L/usr/lib/x86_64-linux-gnu -L/usr/lib
-L/lib/x86_64-linux-gnu -L/lib --no-undefined --as-needed
test-utils@exe/src_libinput-util.c.o test-utils@exe/test_test-utils.c.o
--start-group libinput.so.10.13.0 liblibinput-util.a libquirks.a -lmtdev -ludev
-levdev -lm -lrt -lwacom LIBS/libcheck.a -lsubunit -ldl --end-group -rpath
$ORIGIN/ -rpath-link /home/alan/src/libinput-1.13.4/build-0.51/ -v -Map
test-utils.map -lgcc --push-state --as-needed -lgcc_s --pop-state -lpthread -lc
-lgcc --push-state --as-needed -lgcc_s --pop-state
/usr/lib/gcc/x86_64-linux-gnu/8/crtend.o /usr/lib/x86_64-linux-gnu/crtn.o

Investigating..

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