https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88535
Bug ID: 88535
Summary: sparcv9 gcc 7 causes comparison failure in sparc gcc 8
dwarf2out.o
Product: gcc
Version: 7.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: ebotcazou at gcc dot gnu.org
Target Milestone: ---
Host: sparc-sun-solaris2.11
Target: sparc-sun-solaris2.11
Build: sparcv9-sun-solaris2.11
I've gotten a report that building gcc 8.2.0 on Solaris 11.4/SPARC with the
bundled gcc 7.3.0 failed with a comparison failure:
Comparing stages 2 and 3
Bootstrap comparison failure!
gcc/dwarf2out.o differs
make[2]: *** [Makefile:22905: compare] Error 1
Since I'd never seen the like of that before, it took me quite some time to
reproduce. In the end, it turned out that gcc 7.4.0 configured with
--with-as=/usr/gnu/bin/as --with-gnu-as --with-ld=/usr/bin/ld --without-gnu-ld
--enable-languages=c,c++ sparcv9-sun-solaris2.11
(i.e. 64-bit default) causes the failure, while the same gcc 7.4.0 configured
with
--with-as=/usr/gnu/bin/as --with-gnu-as --with-ld=/usr/bin/ld --without-gnu-ld
--enable-languages=c,c++
(i.e. 32-bit default) does not.
gcc 8.2.0 was configured with
--with-as=/usr/gnu/bin/as --with-gnu-as --with-ld=/usr/bin/ld --without-gnu-ld
--enable-languages=c,c++
in both cases. There are considerable codegen differences in
dwarf2out.c:output_file_names.
I haven't yet tried to reduce the testcase or try something similar on
mainline,
but certainly can if that's helpful.
