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re PR c++/85827 (false positive for -Wunused-but-set-variable because of constexpr-if)

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PR c++/85827
g++.dg/cpp1z/constexpr-if29.C: New test.

From-SVN: r274587
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Marek Polacek 2019-08-16 20:40:36 +00:00 committed by Marek Polacek
parent 639f51ba26
commit a98b732181
2 changed files with 33 additions and 0 deletions
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gcc/cp/ChangeLog
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2019-08-16 Marek Polacek <polacek@redhat.com>
PR c++/85827
* g++.dg/cpp1z/constexpr-if29.C: New test.
2019-08-15 Jason Merrill <jason@redhat.com>
PR c++/90393 - ICE with thow in ?:

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gcc/testsuite/g++.dg/cpp1z/constexpr-if29.C Normal file
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// PR c++/85827
// { dg-do compile { target c++17 } }
// { dg-options "-Wunused-variable -Wunused-parameter" }
template <int N> int f()
{
constexpr bool _1 = N == 1;
constexpr bool _2 = N == 2;
constexpr bool _3 = N == 3;
if constexpr (_1) {
return 5;
} else if constexpr (_2) {
return 1;
} else if constexpr (_3) {
return 7;
}
}
int a() {
return f<1>();
}
int b() {
return f<2>();
}
int c() {
return f<3>();
}