From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 2 Feb 2022 11:40:28 +0000 (+0000)
Subject: libstdc++: Fix -Wunused-variable warning for -fno-exceptions build
X-Git-Tag: basepoints/gcc-13~1308
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2905e1af94519b7ba3c43a57af8a7d5e10815950;p=thirdparty%2Fgcc.git

libstdc++: Fix -Wunused-variable warning for -fno-exceptions build

If _GLIBCXX_THROW_OR_ABORT expands to just __builtin_abort() then the
bool variable used in the filesystem_error constructor is unused. Mark
it as maybe_unused to there's no warning for -fno-exceptions builds.

libstdc++-v3/ChangeLog:

	* src/c++17/fs_dir.cc (fs::recursive_directory_iterator::pop):
	Add [[maybe_unused]] attribute.
	* src/filesystem/dir.cc (fs::recursive_directory_iterator::pop):
	Likewise.
---

diff --git a/libstdc++-v3/src/c++17/fs_dir.cc b/libstdc++-v3/src/c++17/fs_dir.cc
index 149a8b0740cf..a77aabb6dcce 100644
--- a/libstdc++-v3/src/c++17/fs_dir.cc
+++ b/libstdc++-v3/src/c++17/fs_dir.cc
@@ -347,7 +347,7 @@ fs::recursive_directory_iterator::pop(error_code& ec)
 void
 fs::recursive_directory_iterator::pop()
 {
-  const bool dereferenceable = _M_dirs != nullptr;
+  [[maybe_unused]] const bool dereferenceable = _M_dirs != nullptr;
   error_code ec;
   pop(ec);
   if (ec)
diff --git a/libstdc++-v3/src/filesystem/dir.cc b/libstdc++-v3/src/filesystem/dir.cc
index ac9e70da5168..7cf8e62b5e67 100644
--- a/libstdc++-v3/src/filesystem/dir.cc
+++ b/libstdc++-v3/src/filesystem/dir.cc
@@ -334,7 +334,7 @@ fs::recursive_directory_iterator::pop(error_code& ec)
 void
 fs::recursive_directory_iterator::pop()
 {
-  const bool dereferenceable = _M_dirs != nullptr;
+  [[maybe_unused]] const bool dereferenceable = _M_dirs != nullptr;
   error_code ec;
   pop(ec);
   if (ec)