I have a an arm-none-eabi-gcc 7.2.1 .elf that causes gdb to hang when doing tab
Problem appears with various gdb's I tried:
1. arm-none-eabi-gdb 8.0.50-22.214.171.12471128-git. This gdb came with the GNU
Tools for Arm Embedded Processors 7-2017-q4-major release.
2. arm-none-eabi-gdb 7.2.1 20170904 (previous 2017 q2 ARM tools release)
3. gdb 7.11.1 (non-ARM) Ubuntu 7.11.1-0ubuntu1~16.5
A good and a bad .elf are attached in a .zip.
To reproduce, do:
$ gdb gdb-hang-gcc721.elf
(gdb) break mp_cal<tab>
When you press <tab>, gdb will start consuming 100% CPU. I waited for several
minutes with no effect. The process must be `kill -9`d to get rid of it. ^C
does not work.
I tried `set max-completions 5`, which works, and `50`, which still hangs.
The good .elf looks like this:
$ gdb gdb-ok-gcc631.elf
(gdb) break mp_cal<tab>l_
which completes with `l_` immediately (the symbol is still incomplete).
You can test this ARM .elf with x64 gdb; you don't need to use an ARM-specific
Both .elf's are from the same large source tree. One was compiled with -flto
with arm-none-eabi-gcc 6.3.1, the other with -flto on7.2.1. If I turn off
-flto, the problem does not occur, so it's some issue with what -flto is
causing to be generated in the elf. Nevertheless, gdb shouldn't hang even if
the .elf is bad.
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