[Bug ld/24873] New: ld.bfd fails if -lm is included only once within --start-group … --end-group

[dilyan.palauzov at aegee dot org]

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

            Bug ID: 24873
           Summary: ld.bfd fails if -lm is included only once within
                    --start-group … --end-group
           Product: binutils
           Version: 2.33 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: dilyan.palauzov at aegee dot org
  Target Milestone: ---

With ld.bfd 2.32.51.20190802, as discussed at linking with

LINK_ARGS = -Wl,--no-undefined -Wl,--as-needed -Wl,--start-group
libinput.so.10.13.0 liblibinput-util.a libquirks.a /usr/local/lib/libmtdev.so
/usr/x86_64-linux-gnu/libudev.so /usr/local/lib/libevdev.so -lm -lrt
/usr/local/lib/libwacom.so /usr/local/lib/libcheck.a -ldl -lm
/lib64/libsystemd.so -Wl,--end-group
'-Wl,-rpath,$$ORIGIN/:/usr/x86_64-linux-gnu'
-Wl,-rpath-link,/src/wayland/libinput-1.13.4/build-0.49/:/usr/x86_64-linux-gnu

thus with two -lm within --start-group … --end-group does work, while linking
with

LINK_ARGS = -Wl,--no-undefined -Wl,--as-needed -Wl,--start-group
libinput.so.10.13.0 liblibinput-util.a libquirks.a /usr/local/lib/libmtdev.so
/usr/x86_64-linux-gnu/libudev.so /usr/local/lib/libevdev.so -lm -lrt
/usr/local/lib/libwacom.so /usr/local/lib/libcheck.a -ldl /lib64/libsystemd.so
-Wl,--end-group '-Wl,-rpath,$$ORIGIN/:/usr/x86_64-linux-gnu'
-Wl,-rpath-link,/src/wayland/libinput-1.13.4/build-0.51/
-Wl,-rpath-link,/usr/x86_64-linux-gnu

thus with one -lm within --start-group … --end-group, fails with ld.bfd, but
works when I append to the line -fuse-ld=gold or -lm.

My understanding for --start-group … --end-group is that this is a loop, which
works in such a way, that there is no need to repeat things listed in the loop
body.

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