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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Can't get any warnings or errors for code full of bugs"
href="https://bugs.llvm.org/show_bug.cgi?id=49744">49744</a>
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<th>Summary</th>
<td>Can't get any warnings or errors for code full of bugs
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>11.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>jeanmichael.celerier@gmail.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Hello,
consider the following code, ostensibly broken: it assigns a string that lives
on the stack to a string_view, uses another in a reference lambda capture, it's
a mess:
#include <string>
#include <string_view>
#include <functional>
struct foo
{
std::string_view s;
std::function<void()> v;
};
struct bar
{
foo* the_foo{};
void x(foo& f)
{
std::string z = "hello";
f.s = std::string("hello");
f.v = [&] { printf("%s", z.c_str()); };
the_foo = &f;
}
void y(foo& f)
{
printf("%s", f.s.data());
f.v();
}
};
void do_stuff(bar& b, foo& f)
{
b.x(f);
}
int main()
{
bar b;
foo f;
do_stuff(b, f);
b.y(f);
}
Yet neither of clang-tidy -checks='*' or -fsanitize=address
-fsanitize=undefined is able to find anything wrong.
At -O3 the output is obviously bogus.
What is missing in the toolchain for detection of such cases, either at
static-analysis-time or at run-time, to work ?</pre>
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</p>
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