[committed] libstdc++: Fix filesystem::temp_directory_path [PR101709]

[Jonathan Wakely]

On 30/07/21 18:13 +0100, Jonathan Wakely wrote:
>This adds a configure check for the GNU extension secure_getenv and then
>uses it for looking up TMPDIR and similar variables.
>
>Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
>
>libstdc++-v3/ChangeLog:
>
>	PR libstdc++/65018
>	* configure.ac: Check for secure_getenv.
>	* config.h.in: Regenerate.
>	* configure: Regenerate.
>	* src/filesystem/ops-common.h (get_temp_directory_from_env): New
>	helper function to obtain path from the environment.
>	* src/c++17/fs_ops.cc (fs::temp_directory_path): Use new helper.
>	* src/filesystem/ops.cc (fs::temp_directory_path): Likewise.
>	* testsuite/27_io/filesystem/operations/temp_directory_path.cc:
>	Print messages if test cannot be run.
>	* testsuite/experimental/filesystem/operations/temp_directory_path.cc:
>	Likewise. Fix incorrect condition. Use "TMP" to work with
>	Windows as well as POSIX.

This refactoring broke the Windows build. Fixed like so.

Tested powerpc64le-linux and x86_64-w64-mingw32 (cross-compiled and
run under Wine). Committed to trunk.


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