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* [Bug c++/108205] New: ICE following "unused parameter" in precondition
@ 2022-12-23 4:32 webrown.cpp at gmail dot com
0 siblings, 0 replies; only message in thread
From: webrown.cpp at gmail dot com @ 2022-12-23 4:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108205
Bug ID: 108205
Summary: ICE following "unused parameter" in precondition
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: webrown.cpp at gmail dot com
Target Milestone: ---
Using (Homebrew GCC HEAD-37c2d99) 13.0.0 20221213 (experimental)
and compiling via:
g++-HEAD -std=c++23 -fmodules-ts -fcontracts -pedantic-errors \
-O0 -Wall -Wextra -Werror -Wpedantic \
-fno-builtin -fconcepts-diagnostics-depth=2
on an x86 MacBook Pro.
This code compiles:
[[nodiscard]] constexpr int
quotient( double x, double y ) noexcept
{
[[assume (y != 0.0)]];
return int(x / y);
}
The same code also compiles as a module:
export module test;
export [[nodiscard]] constexpr int
quotient( double x, double y ) noexcept
{
[[assume (y != 0.0)]];
return int(x / y);
}
But reformulating the assumption as a precondition causes issues.
First, this code is diagnosed with "unused parameter 'x'", which
seems misleading:
[[nodiscard]] constexpr int
quotient( double x, double y ) noexcept
[[ pre: y != 0.0 ]]
{
return int(x / y);
}
Second, when the above is compiled as a module, the compiler
additionally segfaults:
export module test;
export [[nodiscard]] constexpr int
quotient( double x, double y ) noexcept
[[ pre: y != 0.0 ]]
{
return int(x / y);
}
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2022-12-23 4:32 [Bug c++/108205] New: ICE following "unused parameter" in precondition webrown.cpp at gmail dot com
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