https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91258
--- Comment #6 from seurer at gcc dot gnu.org ---
Digging in to the details of the compilation a bit the error occurs when
collect2 calls ld as part of lto. There is a lot of differences in the
assembler output in the lto stuff before/after r273783. Perhaps you can figure
out something from that (diff attached).
++ /usr/bin/ld -v -plugin
/home/seurer/gcc/build/gcc-test2/gcc/testsuite/g++/../../liblto_plugin.so
-plugin-opt=/home/seurer/gcc/build/gcc-test2/gcc/testsuite/g++/../../lto-wrapper
-plugin-opt=-fresolution=/tmp/cc96yrZX.res -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc
--eh-frame-hdr -V -m elf64ppc -dynamic-linker /lib64/ld64.so.1 -o ./vla-1.exe
/lib/../lib64/crt1.o /lib/../lib64/crti.o
/home/seurer/gcc/build/gcc-test2/gcc/testsuite/g++/../../crtbegin.o
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libsanitizer/ubsan/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libstdc++-v3/src/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libstdc++-v3/src/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libitm/.libs
-L/home/seurer/gcc/build/gcc-test2/gcc/testsuite/g++/../..
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libsanitizer
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libsanitizer/ubsan
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libstdc++-v3/src/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libitm
-L/lib/../lib64 -L/usr/lib/../lib64 /tmp/cc47HC2I.o -lstdc++ -lm -lubsan
-lgcc_s -lgcc -lc -lgcc_s -lgcc
/home/seurer/gcc/build/gcc-test2/gcc/testsuite/g++/../../crtend.o
/lib/../lib64/crtn.o
GNU ld version 2.27-34.base.el7
GNU ld version 2.27-34.base.el7
Supported emulations:
elf64ppc
elf32ppc
elf32ppclinux
elf32ppcsim
elf32_spu
In function 'f',
inlined from 'main' at
/home/seurer/gcc/gcc-test2/gcc/testsuite/g++.dg/ubsan/vla-1.C:11:4:
/home/seurer/gcc/gcc-test2/gcc/testsuite/g++.dg/ubsan/vla-1.C:6:24: warning:
writing 4 bytes into a region of size 0 [-Wstringop-overflow=]
I tried a couple different versions of binutils/ld and they all generate the
same error. Looking through the verbose output of ld I see nothing useful.
