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From: "haoxintu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95475] New: Imprecise column number of runtime error in
 unreachable program point
Date: Tue, 02 Jun 2020 07:26:20 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 11.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95475

            Bug ID: 95475
           Summary: Imprecise column number of runtime error in
                    unreachable program point
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haoxintu at gmail dot com
  Target Milestone: ---

$cat test.cc
int main(){
int var =3D 2;
    switch (var) {
        case 1:=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
        default:=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
            __builtin_unreachable();
    }
}

$cat test.c
int main(){
int var =3D 2;
    switch (var) {
        case 1:=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
        default:=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
            __builtin_unreachable();

    }
}

$g++ -fsanitize=3Dundefined test.cc ; ./a.out
test.cc:6:34: runtime error: execution reached an unreachable program point

$gcc -fsanitize=3Dundefined test.c ; ./a.out
test.c:6:13: runtime error: execution reached an unreachable program point

In clang-trunk

$clang++ -fsanitize=3Dundefined test.cc ; ./a.out
test.cc:6:13: runtime error: execution reached an unreachable program point
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior test.cc:6:13 in=20

$clang -fsanitize=3Dundefined test.c ; ./a.out
test.c:6:13: runtime error: execution reached an unreachable program point
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior test.c:6:13 in=20

$g++ --version
g++ (GCC) 11.0.0 20200526 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.=