https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88881
Bug ID: 88881
Summary: std::filesystem::status gives bad results on mingw32
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
// { dg-options "-std=gnu++17" }
#include <filesystem>
#include <iostream>
void print_status(std::filesystem::path p)
{
std::cout << p << " exists? " << std::boolalpha << exists(p) << '\n';
}
int main()
{
print_status("./");
print_status("./nonexistent-path/..");
print_status("./nonexistent-path/../");
}
This prints:
"./" exists? false
"./nonexistent-path/.." exists? true
"./nonexistent-path/../" exists? false
It seems that mingw's stat() fails for a directory with a trailing slash.
It also implicitly resolves .. components, without consideration for whether
the previous component exists or not (which seems consistent with DOS commands,
e.g. "cd .\kgjhfjfj\.." is equivalent to "cd .", but is not how stat is
supposed to work).
I'll report these to mingw32-w64 but will need to add workarounds to
std::filesystem.
