https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92192
Bug ID: 92192
Summary: Undefined symbols in libstdc++ when compiled with lto
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: as at emlix dot com
Target Milestone: ---
I built GCC 9.2.0 with link time optimization (lto) support:
CFLAGS="-flto" \
CXXFLAGS="-flto" \
../configure \
--enable-languages=c,c++ \
--enable-lto \
AR=gcc-ar \
NM=gcc-nm \
RANLIB=gcc-ranlib
make
When checking symbols of libstdc++, I see a huge list of undefined C and one
C++ symbol:
nm -DC ./prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6.0.27 |
grep ' U ' | grep std::
> U std::istream::ignore(long)
> U std::basic_istream<wchar_t, std::char_traits<wchar_t> >::ignore(long)
I could also reproduce this issue with GCC 7.1, 7.4 and 8.3.
