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Building tests with -DNDEBUG in CFLAGS, gcc 9.2.1 issues the following error:
tst-assert-c++.cc: In function ‘int do_test()’:
tst-assert-c++.cc:66:12: error: unused variable ‘value’ [-Werror=unused-variable]
66 | no_int value;
| ^~~~~
tst-assert-c++.cc:71:18: error: unused variable ‘value’ [-Werror=unused-variable]
71 | bool_and_int value;
| ^~~~~
The assert has been disabled by building glibc with CFLAGS, CXXFLAGS,
and CPPFLAGS with -DNDEBUG which removes the assert and leaves the
value unused.
We never want the assert disabled because that's the point of the
test, so we undefine NDEBUG before including assert.h to ensure that
we get assert correctly defined.
82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
/* Tests for interactions between C++ and assert.
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Copyright (C) 2017-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Undefine NDEBUG to ensure the build system e.g. CFLAGS/CXXFLAGS
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does not disable the asserts we want to test. */
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#undef NDEBUG
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#include <assert.h>
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/* The C++ standard requires that if the assert argument is a constant
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subexpression, then the assert itself is one, too. */
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constexpr int
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check_constexpr ()
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{
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return (assert (true), 1);
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}
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/* Objects of this class can be contextually converted to bool, but
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cannot be compared to int. */
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struct no_int
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{
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no_int () = default;
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no_int (const no_int &) = delete;
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explicit operator bool () const
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{
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return true;
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}
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bool operator! () const; /* No definition. */
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template <class T> bool operator== (T) const; /* No definition. */
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template <class T> bool operator!= (T) const; /* No definition. */
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};
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/* This class tests that operator== is not used by assert. */
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struct bool_and_int
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{
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bool_and_int () = default;
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bool_and_int (const no_int &) = delete;
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explicit operator bool () const
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{
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return true;
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}
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bool operator! () const; /* No definition. */
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template <class T> bool operator== (T) const; /* No definition. */
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template <class T> bool operator!= (T) const; /* No definition. */
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};
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static int
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do_test ()
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{
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{
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no_int value;
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assert (value);
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}
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{
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bool_and_int value;
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assert (value);
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}
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return 0;
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}
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#include <support/test-driver.c>
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