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* [Bug libstdc++/99865] New: std::filesystem namespace identifiers pollute global namespace
@ 2021-04-01 9:45 zoid at riseup dot net
2021-04-01 9:47 ` [Bug libstdc++/99865] " zoid at riseup dot net
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: zoid at riseup dot net @ 2021-04-01 9:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99865
Bug ID: 99865
Summary: std::filesystem namespace identifiers pollute global
namespace
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: zoid at riseup dot net
Target Milestone: ---
At least two free functions from the std::filesystem namespace resolve without
being scope-resolved. The two I found were std::filesystem::create_directory
and std::filesystem::remove_all. There might be more. I am uncertain if this is
a problem in the library implementation or the compiler itself.
Minimal Reproducible Example:
#include <filesystem>
struct TempDir {
std::filesystem::path const path;
TempDir(std::filesystem::path const& p) : path(p) {
// std::filesystem::create_directory(p); // <-- expected
if (!create_directory(p)) { // <- compiles
throw 0;
}
}
~TempDir() {
// std::filesystem::remove_all(path); // <-- expected
remove_all(path); // <- compiles
}
};
int main() {
// create_directory("bar"); // <- rejected (correctly)
TempDir("foo");
}
Compile with: g++ -Wall -Wextra -pedantic -std=c++17 mre.cpp
Produces zero diagnostics. Compiles binary a.out.
My expectation would have been that the compiler rejected the lines marked with
"compiles". As it does when these identifiers appear directly in main.
Tested with g++ 10.2.1 under both debian and fedora. Output of g++ -v:
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 10.2.1-6'
--with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-10
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--enable-libphobos-checking=release --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-10-Km9U7s/gcc-10-10.2.1/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-10-Km9U7s/gcc-10-10.2.1/debian/tmp-gcn/usr,hsa
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-build-config=bootstrap-lto-lean --enable-link-mutex
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.1 20210110 (Debian 10.2.1-6)
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/99865] std::filesystem namespace identifiers pollute global namespace
2021-04-01 9:45 [Bug libstdc++/99865] New: std::filesystem namespace identifiers pollute global namespace zoid at riseup dot net
@ 2021-04-01 9:47 ` zoid at riseup dot net
2021-04-01 9:51 ` pinskia at gcc dot gnu.org
2021-04-01 9:55 ` zoid at riseup dot net
2 siblings, 0 replies; 4+ messages in thread
From: zoid at riseup dot net @ 2021-04-01 9:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99865
--- Comment #1 from zoid at riseup dot net ---
Note: I tried attaching mre.ii generated by -save-temps but its file size of
over 1MB was rejected by bugzilla. If the file is required, please advise how I
can provide it.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/99865] std::filesystem namespace identifiers pollute global namespace
2021-04-01 9:45 [Bug libstdc++/99865] New: std::filesystem namespace identifiers pollute global namespace zoid at riseup dot net
2021-04-01 9:47 ` [Bug libstdc++/99865] " zoid at riseup dot net
@ 2021-04-01 9:51 ` pinskia at gcc dot gnu.org
2021-04-01 9:55 ` zoid at riseup dot net
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-04-01 9:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99865
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is just ADL (Argument-dependent lookup) and therefor very much valid C++
code.
ADL has been a standard part of C++ since the first standard even.
See https://en.cppreference.com/w/cpp/language/adl for more examples of ADL
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libstdc++/99865] std::filesystem namespace identifiers pollute global namespace
2021-04-01 9:45 [Bug libstdc++/99865] New: std::filesystem namespace identifiers pollute global namespace zoid at riseup dot net
2021-04-01 9:47 ` [Bug libstdc++/99865] " zoid at riseup dot net
2021-04-01 9:51 ` pinskia at gcc dot gnu.org
@ 2021-04-01 9:55 ` zoid at riseup dot net
2 siblings, 0 replies; 4+ messages in thread
From: zoid at riseup dot net @ 2021-04-01 9:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99865
--- Comment #3 from zoid at riseup dot net ---
Apologies. I always forget about ADL.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-04-01 9:45 [Bug libstdc++/99865] New: std::filesystem namespace identifiers pollute global namespace zoid at riseup dot net
2021-04-01 9:47 ` [Bug libstdc++/99865] " zoid at riseup dot net
2021-04-01 9:51 ` pinskia at gcc dot gnu.org
2021-04-01 9:55 ` zoid at riseup dot net
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