https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101241
Bug ID: 101241
Summary: Internal compiler error from MathFunctions.h in the
eigen library
Product: gcc
Version: 11.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: r.langer at itv dot rwth-aachen.de
Target Milestone: ---
I used a docker image of Clean Linux (version 34790) and installed gcc 11.1.1
with:
swupd bundle-add c-basic wget
The following commands produce the error:
wget https://gitlab.com/libeigen/eigen/-/archive/3.4-rc1/eigen-3.4-rc1.tar.bz2
tar -xf eigen-3.4-rc1.tar.bz2
printf "#include <Eigen/Core>\n int main(int,char const*[]){}\n" >
eigen_bug.cpp
g++ eigen_bug.cpp -Ieigen-3.4-rc1/ -Ofast -ffast-math
Expected output from the last command:
In file included from eigen-3.4-rc1/Eigen/Core:171,
from eigen_bug.cpp:1:
eigen-3.4-rc1/Eigen/src/Core/MathFunctions.h:1036:71: internal compiler error:
in maybe_default_option, at opts.c:332
1036 | template<> EIGEN_TMP_NOOPT_ATTRIB bool isnan_impl(const long double& x)
{ return __builtin_isnan(x); }
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
The following works fine:
g++ eigen_bug.cpp -Ieigen-3.4-rc1/ -O3 -ffast-math
