https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84847
--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> --- On Tue, 13 Mar 2018, hjl.tools at gmail dot com wrote: > 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? Can you try make check-target-libstdc++-v3 RUNTESTFLAGS="prettyprinters.exp" with binutils master and the prettyprinters.exp hack removed? Do you know what fixed it on master?
