Public bug reported:
GCC crashes when trying to compile the following program.
$> cat prog.cpp
struct Boolean {
bool is_true : 1;
constexpr explicit Boolean () : is_true(true) { }
constexpr explicit Boolean (bool init) : is_true(init) {
if (is_true != Boolean().is_true)
is_true = false;
}
};
int main() { Boolean x(false); }
$> g++ -O2 prog.cpp
prog.cpp: In function ‘int main()’:
prog.cpp:10:29: in constexpr expansion of ‘x.Boolean::Boolean(0)’
prog.cpp:10:29: internal compiler error: in cxx_eval_bit_field_ref, at
cp/constexpr.c:2570
int main() { Boolean x(false); }
^
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
Note that -O2 is required for reproducing the bug (otherwise, constexpr does
not seem to be evaluated in the compile time). The program might seem a bit
convoluted, but this is the minimum non-working example I was able to construct
from a real-life scenario. The problem does not occur if line
bool is_true : 1;
is changed to
bool is_true;
-- Marcin.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: g++ 4:7.3.0-3ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Sep 8 12:51:21 2018
InstallationDate: Installed on 2014-12-10 (1367 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: gcc-defaults
UpgradeStatus: Upgraded to bionic on 2018-08-13 (26 days ago)
** Affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1791425
Title:
Compiler error: constexpr with bitfields.
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