https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114602
Bug ID: 114602
Summary: Compilcation failure when using a user-defined
function which name is same as a posix function
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: zwuis at outlook dot com
Target Milestone: ---
Code:
```
#include <algorithm>
#include <cstring>
struct foo {};
bool bcmp(foo, foo) { return false; }
int main() {
foo* ptr = nullptr;
std::sort(ptr, ptr, bcmp);
}
```
Compiler option: -std=c++17 -v
Compiler output:
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-13.2.0/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-13.2.0/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,m2 --enable-ld=yes
--enable-gold=yes --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-linker-build-id --enable-lto --enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build-gcc--binutils-2.40
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.2.0 (Compiler-Explorer-Build-gcc--binutils-2.40)
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
'-masm=intel' '-S' '-std=c++17' '-v' '-shared-libgcc' '-mtune=generic'
'-march=x86-64' '-dumpdir' '/app/'
/opt/compiler-explorer/gcc-13.2.0/bin/../libexec/gcc/x86_64-linux-gnu/13.2.0/cc1plus
-quiet -v -imultiarch x86_64-linux-gnu -iprefix
/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/x86_64-linux-gnu/13.2.0/
-D_GNU_SOURCE <source> -quiet -dumpdir /app/ -dumpbase output.cpp -dumpbase-ext
.cpp -masm=intel -mtune=generic -march=x86-64 -g -std=c++17 -version
-fdiagnostics-color=always -o /app/output.s
GNU C++17 (Compiler-Explorer-Build-gcc--binutils-2.40) version 13.2.0
(x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.24-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/x86_64-linux-gnu/13.2.0/../../../../x86_64-linux-gnu/include"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0/backward"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/13.2.0/include"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/13.2.0/include-fixed/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/13.2.0/include-fixed"
ignoring nonexistent directory
"/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/13.2.0/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0
/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0/x86_64-linux-gnu
/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/x86_64-linux-gnu/13.2.0/../../../../include/c++/13.2.0/backward
/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/x86_64-linux-gnu/13.2.0/include
/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/x86_64-linux-gnu/13.2.0/include-fixed/x86_64-linux-gnu
/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/x86_64-linux-gnu/13.2.0/include-fixed
/usr/local/include
/opt/compiler-explorer/gcc-13.2.0/bin/../lib/gcc/../../include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
Compiler executable checksum: 1f79f5ecde65b98f00fc1524c141d88e
<source>: In function 'int main()':
<source>:9:14: error: no matching function for call to 'sort(foo*&, foo*&,
<unresolved overloaded function type>)'
9 | std::sort(ptr, ptr, bcmp);
| ~~~~~~~~~^~~~~~~~~~~~~~~~
In file included from
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/algorithm:61,
from <source>:1:
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/bits/stl_algo.h:4851:5:
note: candidate: 'template<class _RAIter> void std::sort(_RAIter, _RAIter)'
4851 | sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
| ^~~~
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/bits/stl_algo.h:4851:5:
note: template argument deduction/substitution failed:
<source>:9:14: note: candidate expects 2 arguments, 3 provided
9 | std::sort(ptr, ptr, bcmp);
| ~~~~~~~~~^~~~~~~~~~~~~~~~
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/bits/stl_algo.h:4882:5:
note: candidate: 'template<class _RAIter, class _Compare> void
std::sort(_RAIter, _RAIter, _Compare)'
4882 | sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
| ^~~~
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/bits/stl_algo.h:4882:5:
note: template argument deduction/substitution failed:
<source>:9:14: note: couldn't deduce template parameter '_Compare'
9 | std::sort(ptr, ptr, bcmp);
| ~~~~~~~~~^~~~~~~~~~~~~~~~
In file included from
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/algorithm:73:
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/pstl/glue_algorithm_defs.h:292:1:
note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator,
class _Compare>
__pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void>
std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator,
_Compare)'
292 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first,
_RandomAccessIterator __last, _Compare __comp);
| ^~~~
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/pstl/glue_algorithm_defs.h:292:1:
note: template argument deduction/substitution failed:
<source>:9:14: note: candidate expects 4 arguments, 3 provided
9 | std::sort(ptr, ptr, bcmp);
| ~~~~~~~~~^~~~~~~~~~~~~~~~
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/pstl/glue_algorithm_defs.h:296:1:
note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator>
__pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void>
std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator)'
296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first,
_RandomAccessIterator __last);
| ^~~~
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/pstl/glue_algorithm_defs.h:296:1:
note: template argument deduction/substitution failed:
In file included from
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/pstl/glue_algorithm_defs.h:15:
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/pstl/execution_defs.h: In
substitution of 'template<class _ExecPolicy, class _Tp> using
__pstl::__internal::__enable_if_execution_policy = typename
std::enable_if<__pstl::execution::v1::is_execution_policy<typename
std::remove_cv<typename std::remove_reference<_Tp>::type>::type>::value,
_Tp>::type [with _ExecPolicy = foo*&; _Tp = void]':
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/pstl/glue_algorithm_defs.h:296:1:
required by substitution of 'template<class _ExecutionPolicy, class
_RandomAccessIterator>
__pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void>
std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator)
[with _ExecutionPolicy = foo*&; _RandomAccessIterator = foo*]'
<source>:9:14: required from here
/opt/compiler-explorer/gcc-13.2.0/include/c++/13.2.0/pstl/execution_defs.h:150:7:
error: no type named 'type' in 'struct std::enable_if<false, void>'
150 | using __enable_if_execution_policy =
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
You can also see https://godbolt.org/z/dTWK17v51 .
Note that `#include <cstring>` is required to reproduce the bug.
