https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99333
Bug ID: 99333
Summary: std::filesystem::path().is_absolute() thinks UNC paths
aren't absolute
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: moritz at bunkus dot org
Target Milestone: ---
Created attachment 50280
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50280&action=edit
test case
Compiling with gcc 10.2.0 from the mxe cross compilation environment for
Windows.
The attached sample program says it all. It shows that
std::filesystem::("\\server\share\file.txt").is_absolute() is false and turns
std::filesystem::absolute("\\server\share\file.txt") into something like
"C:\server\share\file.txt".
boost::filesystem::path(…).is_aboslute(), on the other hand, considers UNC
paths absolute & leaves them unmodified via boost::filesystem::absolute(…)
The test program outputs the following:
std::filesystem:
original \\disky\mosu\existing_file.txt
is_absolute 0
absolute "C:\\disky\\mosu\\existing_file.txt"
boost::filesystem:
original \\disky\mosu\existing_file.txt
is_absolute 1
absolute "\\disky\mosu\existing_file.txt"
Compile with something like:
x86_64-w64-mingw32.static-g++ -std=c++17 \
-I/home/mosu/prog/video/mingw/cross/usr/x86_64-w64-mingw32.static/include \
-L/home/mosu/prog/video/mingw/cross/usr/x86_64-w64-mingw32.static/lib \
-o std_filesystem_unc_paths_vs_absolute.exe \
std_filesystem_unc_paths_vs_absolute.cpp \
-lboost_filesystem-mt-s-x64 -lboost_system-mt-s-x64
