include/istream causes test failures on x86 due to -Werror,-Wtautological-constant-compare #35046
Description
| Bugzilla Link | 35698 |
| Resolution | FIXED |
| Resolved on | Jan 19, 2018 02:12 |
| Version | unspecified |
| OS | Linux |
| Blocks | #35152 |
| Reporter | LLVM Bugzilla Contributor |
| CC | @rovka,@zmodem,@mclow |
Extended Description
A large number of libc++ and libc++abi tests have started failing on 32-bit x86 recently due to the following warning-errors:
FAIL: libc++abi :: cxa_bad_typeid.pass.cpp (44 of 57)
******************** TEST 'libc++abi :: cxa_bad_typeid.pass.cpp' FAILED ********************
Command: ['/usr/lib/llvm/6/bin/i686-pc-linux-gnu-clang', '-o', '/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999-abi_x86_32.x86/test/Output/cxa_bad_typeid.pass.cpp.o', '-x', 'c++', '/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999/test/cxa_bad_typeid.pass.cpp', '-c', '-v', '-D_LIBCPP_DISABLE_AVAILABILITY', '-ftemplate-depth=270', '-Werror=thread-safety', '-DLIBCXXABI_NO_TIMER', '-funwind-tables', '-std=c++2a', '-nostdinc++', '-I/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/include', '-I/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999/include', '-I/usr/include', '-D__STDC_FORMAT_MACROS', '-D__STDC_LIMIT_MACROS', '-D__STDC_CONSTANT_MACROS', '-I/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/test/support', '-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER', '-Wall', '-Wextra', '-Werror', '-Wuser-defined-warnings', '-Wshadow', '-Wno-unused-command-line-argument', '-Wno-attributes', '-Wno-pessimizing-move', '-Wno-c++11-extensions', '-Wno-user-defined-literals', '-Wno-noexcept-type', '-Wno-aligned-allocation-unavailable', '-Wsign-compare', '-Wunused-variable', '-Wunused-parameter', '-Wunreachable-code', '-Wno-conversion', '-Wno-unused-local-typedef', '-Wno-#warnings', '-c']
Exit Code: 1
Standard Error:
clang version 6.0.0
Target: i686-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm/6/bin
Selected GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: 32;@m32
"/usr/lib64/llvm/6/bin/clang-6.0" -cc1 -triple i686-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name cxa_bad_typeid.pass.cpp -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu pentium4 -dwarf-column-info -debugger-tuning=gdb -v -coverage-notes-file /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999-abi_x86_32.x86/test/Output/cxa_bad_typeid.pass.cpp.gcno -nostdinc++ -resource-dir /usr/lib64/llvm/6/bin/../../../../lib/clang/6.0.0 -D _LIBCPP_DISABLE_AVAILABILITY -D LIBCXXABI_NO_TIMER -I /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/include -I /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999/include -I /usr/include -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -I /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/test/support -D _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -internal-isystem /usr/local/include -internal-isystem /usr/lib64/llvm/6/bin/../../../../lib/clang/6.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -Werror=thread-safety -Wall -Wextra -Werror -Wuser-defined-warnings -Wshadow -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-c++11-extensions -Wno-user-defined-literals -Wno-noexcept-type -Wno-aligned-allocation-unavailable -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-conversion -Wno-unused-local-typedef -Wno-#warnings -std=c++2a -fdeprecated-macro -fdebug-compilation-dir /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999-abi_x86_32.x86/test -ftemplate-depth 270 -ferror-limit 19 -fmessage-length 0 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -o /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999-abi_x86_32.x86/test/Output/cxa_bad_typeid.pass.cpp.o -x c++ /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999/test/cxa_bad_typeid.pass.cpp
clang -cc1 version 6.0.0 based upon LLVM 6.0.0svn default target x86_64-pc-linux-gnu
ignoring nonexistent directory "/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/test/support"
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/include"
ignoring duplicate directory "/usr/include"
as it is a non-system directory that duplicates a system directory
#include "..." search starts here:
#include <...> search starts here:
/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/include
/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999/include
/usr/lib64/llvm/6/bin/../../../../lib/clang/6.0.0/include
/usr/include
End of search list.
In file included from /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxxabi-9999/test/cxa_bad_typeid.pass.cpp:18:
In file included from /var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/include/iostream:40:
/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/include/istream:714:24: error: result of comparison 'long' < -2147483648 is always false [-Werror,-Wtautological-constant-compare]
if (__temp < numeric_limits::min())
~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
/var/tmp/portage/sys-libs/libcxxabi-9999/work/libcxx/include/istream:719:29: error: result of comparison 'long' > 2147483647 is always false [-Werror,-Wtautological-constant-compare]
else if (__temp > numeric_limits::max())
~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
2 errors generated.
Compilation failed unexpectedly!