https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84847
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to David Malcolm from comment #0) > The downstream bug report: > https://bugzilla.redhat.com/show_bug.cgi?id=1543912 > describes a problem building systemd and systemd-bootchart with gcc 8, which > turned out to be due to those packages' configure scripts injecting both > -flto > and > -Wl,--gc-sections > > They build fine with just one of them, but with both, the binaries have > corrupt DWARF debuginfo. > > Adding "-Wl,--print-gc-sections" shows the issue more clearly. > > I created a minimal reproducer here: > https://github.com/davidmalcolm/rhbz-1543912 > with which I can reproduce the issue, using: > gcc-8.0.1-0.16.fc29.x86_64 > binutils-2.30-6.fc29.x86_64 > (this is on Fedora in a chroot via "mock -r fedora-rawhide-x86_64 shell"; > I'm still working on reproducing this outside a chroot) > > $ make > gcc -I ./src -flto -O2 -g -c src/bootchart.c -o build/bootchart.o > gcc -I ./src -flto -O2 -g -c src/log.c -o build/log.o > gcc -flto -g -Wl,--gc-sections -Wl,--print-gc-sections \ > build/bootchart.o build/log.o \ > -o build/systemd-bootchart > /usr/bin/ld: Removing unused section '.rodata.cst4' in file > '/usr/lib/gcc/x86_64-redhat-linux/8/../../../../lib64/crt1.o' > /usr/bin/ld: Removing unused section '.data' in file > '/usr/lib/gcc/x86_64-redhat-linux/8/../../../../lib64/crt1.o' > /usr/bin/ld: Removing unused section '.rodata' in file > '/usr/lib/gcc/x86_64-redhat-linux/8/crtbegin.o' > /usr/bin/ld: Removing unused section '.debug_abbrev' in file > '/tmp/cc1vnNPxdebugobj' > /usr/bin/ld: Removing unused section '.debug_str' in file > '/tmp/cc1vnNPxdebugobj' > /usr/lib/rpm/debugedit build/systemd-bootchart > /usr/lib/rpm/debugedit: build/systemd-bootchart: Invalid .line_table offset > 0x2b0803 > /usr/lib/rpm/debugedit: build/systemd-bootchart: Could not find DWARF > abbreviation 7 > With binutils master branch, I got mkdir build gcc -I ./src -flto -O2 -g -c src/bootchart.c -o build/bootchart.o gcc -I ./src -flto -O2 -g -c src/log.c -o build/log.o gcc -flto -g -Wl,--gc-sections -Wl,--print-gc-sections \ build/bootchart.o build/log.o \ -o build/systemd-bootchart /usr/local/bin/ld: removing unused section '.rodata.cst4' in file '/usr/lib/gcc/x86_64-redhat-linux/7/../../../../lib64/crt1.o' /usr/local/bin/ld: removing unused section '.data' in file '/usr/lib/gcc/x86_64-redhat-linux/7/../../../../lib64/crt1.o' /usr/local/bin/ld: removing unused section '.rodata' in file '/usr/lib/gcc/x86_64-redhat-linux/7/crtbegin.o' /usr/lib/rpm/debugedit build/systemd-bootchart Does it look OK?
