https://sourceware.org/bugzilla/show_bug.cgi?id=24873
--- Comment #6 from Alan Modra <amodra at gmail dot com> --- OK, so I fixed the build dependency but when I build locally using CFLAGS="-O2 -g -flto" CXXFLAGS="-O2 -g -flto" and gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0 I don't reproduce the problem. Oh yes, lots more -lm on the link command line for test-utils in my case (and -ludev -levdev), so I took them all out except for the ones inside --start-group/--end-group and still it links OK. Linking with mapfile output shows libm is pulled in due to reference to floor in lib_check_pic.a: libm.so.6 /usr/lib/x86_64-linux-gnu/libcheck_pic.a(check.o) (floor@@GLIBC_2.2.5) Huh, given that lib_check_pic.a was outside --start-group/--end-group I should have left in -lm after that archive.. Only not a problem due to -flto objects causing ld to scan over libraries again. Also, the mapfile shows the recompiled LTO objects (ltrans.o) being inserted somewhere reasonably sensible. LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crti.o LOAD /usr/lib/gcc/x86_64-linux-gnu/7/crtbeginS.o LOAD test-utils.ltrans0.ltrans.o START GROUP LOAD libinput.so.10.13.0 LOAD liblibinput-util.a LOAD libquirks.a LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libmtdev.so LOAD /lib/x86_64-linux-gnu/libudev.so LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libevdev.so LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libm.so START GROUP LOAD /lib/x86_64-linux-gnu/libm.so.6 LOAD /usr/lib/x86_64-linux-gnu/libmvec_nonshared.a LOAD /lib/x86_64-linux-gnu/libmvec.so.1 END GROUP LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/librt.so LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libwacom.so END GROUP LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcheck_pic.a LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libsubunit.so LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libdl.so LOAD /usr/lib/gcc/x86_64-linux-gnu/7/libgcc.a LOAD /usr/lib/gcc/x86_64-linux-gnu/7/libgcc_s.so START GROUP LOAD /usr/lib/gcc/x86_64-linux-gnu/7/libgcc_s.so.1 LOAD /usr/lib/gcc/x86_64-linux-gnu/7/libgcc.a END GROUP LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libpthread.so START GROUP LOAD /lib/x86_64-linux-gnu/libpthread.so.0 LOAD /usr/lib/x86_64-linux-gnu/libpthread_nonshared.a END GROUP LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libc.so START GROUP LOAD /lib/x86_64-linux-gnu/libc.so.6 LOAD /usr/lib/x86_64-linux-gnu/libc_nonshared.a LOAD /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 END GROUP LOAD /usr/lib/gcc/x86_64-linux-gnu/7/libgcc.a LOAD /usr/lib/gcc/x86_64-linux-gnu/7/libgcc_s.so START GROUP LOAD /usr/lib/gcc/x86_64-linux-gnu/7/libgcc_s.so.1 LOAD /usr/lib/gcc/x86_64-linux-gnu/7/libgcc.a END GROUP LOAD /usr/lib/gcc/x86_64-linux-gnu/7/crtendS.o LOAD /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crtn.o -- You are receiving this mail because: You are on the CC list for the bug. _______________________________________________ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
