https://gcc.gnu.org/g:bf07f9a9832494a7270a7099195f47f2126e8e07
commit r15-7859-gbf07f9a9832494a7270a7099195f47f2126e8e07 Author: Thomas Schwinge <tschwi...@baylibre.com> Date: Wed Feb 19 20:39:25 2025 +0100 libstdc++: Avoid '-Wunused-parameter' for 'out' in member function 'std::codecvt_base::result std::__format::{anonymous}::__encoding::conv(std::string_view, std::string&) const' In a newlib configuration: ../../../../../source-gcc/libstdc++-v3/src/c++20/format.cc: In member function ‘std::codecvt_base::result std::__format::{anonymous}::__encoding::conv(std::string_view, std::string&) const’: ../../../../../source-gcc/libstdc++-v3/src/c++20/format.cc:100:35: error: unused parameter ‘out’ [-Werror=unused-parameter] 100 | conv(string_view input, string& out) const | ~~~~~~~~^~~ libstdc++-v3/ * src/c++20/format.cc (conv): Tag 'out' as '[[maybe_unused]]'. Diff: --- libstdc++-v3/src/c++20/format.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libstdc++-v3/src/c++20/format.cc b/libstdc++-v3/src/c++20/format.cc index 1a24fcab7f76..6967d53259da 100644 --- a/libstdc++-v3/src/c++20/format.cc +++ b/libstdc++-v3/src/c++20/format.cc @@ -97,7 +97,7 @@ struct __encoding : locale::facet // Convert `input` to UTF-8, using `out` to hold the result. codecvt_base::result - conv(string_view input, string& out) const + conv(string_view input, [[maybe_unused]] string& out) const { if (input.empty()) [[unlikely]] return codecvt_base::noconv;