https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100254
Bug ID: 100254
Summary: [11/12 Regression] -fcompare-debug failure (length)
with -O2 -fno-guess-branch-probability -fipa-pta
-fnon-call-exceptions
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
CC: aoliva at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Created attachment 50673
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50673&action=edit
auto-reduced testcase (from OpenTTD sources)
Compiler output:
$ x86_64-pc-linux-gnu-g++ -O2 -mtune=goldmont -fno-guess-branch-probability
-fipa-pta -fnon-call-exceptions -fcompare-debug testcase.C
testcase.C:20:38: warning: friend declaration 'bool
operator!=(_Rb_tree_const_iterator<_Tp>::_Self,
_Rb_tree_const_iterator<_Tp>::_Self)' declares a non-template function
[-Wnon-template-friend]
20 | friend bool operator!=(_Self, _Self);
| ^
testcase.C:20:38: note: (if this is not what you intended, make sure the
function template has already been declared and add '<>' after the function
name here)
testcase.C: In member function 'bool CargoSorter::operator()(const
CargoDataEntry*, const CargoDataEntry*) const':
testcase.C:82:61: warning: no return statement in function returning non-void
[-Wreturn-type]
82 | const CargoDataEntry *) const {}
| ^
x86_64-pc-linux-gnu-g++: error: testcase.C: '-fcompare-debug' failure (length)
$ x86_64-pc-linux-gnu-g++ -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-g++
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-100-20210424001429-gbcd77b7b9f3-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r12-100-20210424001429-gbcd77b7b9f3-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20210424 (experimental) (GCC)
