https://bugs.llvm.org/show_bug.cgi?id=38029
Bug ID: 38029
Summary: Unused code triggers linker failure
Product: clang
Version: 6.0
Hardware: Other
OS: FreeBSD
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
This program fails to link (clang6 on FreeBSD):
```
#include <string>
static std::string f() { return std::string(); }
int main() { (void) f; }
```
The error message is
```
/tmp/t-a76eba.o: In function `f()':
t.cpp:(.text+0x20): undefined reference to `std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string()'
/usr/bin/ld: a.out: hidden symbol
`_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEC2Ev' isn't
defined
/usr/bin/ld: final link failed: Nonrepresentable section on output
```
It also fails with clang5 on FreeBSD, on FreeBSDs 11- and 12-, and reportedly
on Linux with clang6 and -stdlib=libc++.
It doesn't fail with -O1 or above. It doesn't fail if you remove the `(void)f;`
statement, although then you will get an unused function warning.
Also reported downstream as
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229479
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