[Bug build/25182] [9.1 Regression] gdb trunk fails to build on arm-linux-gnueabihf
wilson at gcc dot gnu.org
sourceware-bugzilla@sourceware.org
Wed Nov 13 02:47:00 GMT 2019
https://sourceware.org/bugzilla/show_bug.cgi?id=25182
Jim Wilson <wilson at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |wilson at gcc dot gnu.org
--- Comment #2 from Jim Wilson <wilson at gcc dot gnu.org> ---
I just got the same bug report via email for riscv32-linux.
The problem here is that general_symbol_info contains a LONGEST field, which
for most targets will be 8-bytes in size and require 8-byte alignment.
However, i386 has a 32-bit ABI that gives long long types only 4 byte
alignment. So the size of the structure will be 20 bytes for i386 and 24 bytes
for most all other 32-bit targets. You could probably work around this by
using something like 16 + __alignof__ (LONGEST) to compute the structure size,
but that uses a GCC extension which may not work for other compilers. If it is
possible for LONGEST to be a 32-bit type, then the structure would be 16 bytes.
That would require something like 8 + sizeof (LONGEST) + __alignof__
(LONGEST). Or just remove the static assert as suggested in the gerrit patch.
I haven't tried a build from scratch, so there may also be other related
problems.
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