https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100689
Bug ID: 100689
Summary: internal compiler error: Segmentation fault when using
modules and -g
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ma30002000 at yahoo dot de
Target Milestone: ---
When compile file files exp.cpp and imp.cpp with the following contents:
------------ exp.cpp ----------
module;
#include <string>
export module mod;
export std::string F() { return "test"; }
-------------------------------
------------ imp.cpp ----------
#include <span>
#include <string>
#include <cstdint>
import mod;
constexpr void
ToHexInt(uint8_t value, char& dst) {
if (value <= 9)
dst = static_cast<char>('0' + value);
if (value >= 0xa && value <= 0xf)
dst = static_cast<char>('a' + (value - 0x0a));
}
template <class DestT = std::string>
inline DestT
ToHexString(const std::span<const uint8_t>& value) {
DestT output;
output.resize(value.size() * 2);
uint8_t i;
ToHexInt(i, output[0]);
return output;
}
int main() {
uint8_t a[2];
ToHexString(a);
}
-------------------------------
with the following compiler command lines:
/usr/bin/g++-11 -g -fmodules-ts -std=gnu++2a -o exp.cpp.o -c exp.cpp
/usr/bin/g++-11 -g -fmodules-ts -std=gnu++2a -o imp.cpp.o -c imp.cpp
I get the following error on compilation of imp.cpp:
-------------------------------
In file included from /usr/include/c++/11/string:38,
from exp.cpp:3,
of module mod, imported at imp.cpp:5:
/usr/include/c++/11/bits/basic_string.h:1045:9: internal compiler error:
Segmentation fault
1045 | __glibcxx_assert(__pos <= size());
| ^~~~~~~~~~~~~~~~
0xe30681 internal_error(char const*, ...)
???:0
0x9d6c83 module_state::mangle(bool)
???:0
0xf628a7 mangle_decl(tree_node*)
???:0
0x1487939 symbol_table::finalize_compilation_unit()
???:0
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-11/README.Bugs> for instructions.
-------------------------------
If I do not specify "-g" the compilation concludes successfully.
