https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88999
Bug ID: 88999
Summary: [9 Regression] testcases using in_avail() fail on
nios2-elf
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: sandra at gcc dot gnu.org
Target Milestone: ---
I'm seeing some libstdc++ test regressions on nios2-elf testing on mainline.
The symptoms are assertion failures about the results of calls to in_avail().
# Assertion 'strmsz_1 > strmsz_2' failed.
FAIL: 27_io/basic_filebuf/sgetn/char/1-in.cc execution test
FAIL: 27_io/basic_filebuf/sgetn/char/1-io.cc execution test
FAIL: 27_io/basic_filebuf/sgetn/char/2-in.cc execution test
FAIL: 27_io/basic_filebuf/sgetn/char/2-io.cc execution test
# Assertion 'i != 0' failed.
FAIL: 27_io/basic_istream/readsome/char/6746-2.cc execution test
FAIL: 27_io/basic_istream/readsome/wchar_t/6746-2.cc execution test
I see that these tests are xfailed for bare-metal ARM targets with a note that
ARM semihosting doesn't support the underlying fstat call, but that is not true
of nios2. These tests all passed on nios2-elf with GCC 8.
I realize it is hard for other people to test this target, but I'd be happy to
test a patch or do some debugging to try to track it down given some clues
about where to look. (Maybe this failure rings a bell with someone already
familiar with the code?)
