Re: gcc possibly generating invalid assembler
On Thu, Apr 13, 2017 at 01:08:59PM +0200, John Paul Adrian Glaubitz wrote:
> Hi!
>
> I have unsuccessfully been trying to build liburcu on Debian/m68k. After
> adding "m68k" as a detected architecture in configure.ac, the build
> fails with the assembler generating syntax error messages [1]:
>
> gcc -DHAVE_CONFIG_H -I. -I../.. -I../../urcu -Wdate-time -D_FORTIFY_SOURCE=2 -I../.. -I../.. -I../../tests/common -g -g -O2
> -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -pthread -c -o test_urcu_defer.o test_urcu_defer.c
> /tmp/ccXHVXOc.s: Assembler messages:
> /tmp/ccXHVXOc.s:312: Error: syntax error -- statement `add.l %d1,nr_writes@TLSLE+4(%a0)' ignored
> /tmp/ccXHVXOc.s:440: Error: syntax error -- statement `add.l %d1,nr_writes@TLSLE+4(%a0)' ignored
>
> Since the source code file in question doesn't contain any m68k inline
> assembly, I would suspect this to be a problem with the code generated
> by gcc.
>
> Any suggestions?
The comments in gcc/config/m68k/m68k.c:m68k_final_prescan_insn() mention
this as potential problem but I have no deep insight or clue why the solution
doesn't work.
Richard
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