Gentoo's sandbox does not whitelist this path by default yet. (4.1 update: https://github.com/ccache/ccache/issues/984 https://github.com/ccache/ccache/issues/1044 https://github.com/ccache/ccache/commit/a0edd4294f6a5a2d3f0c7b01273736f975f250e1 https://github.com/ccache/ccache/commit/ef2e922f9642f943199138447b29ec53fa63ea68 ... gets us closer, but not there yet.) And see https://github.com/ccache/ccache/discussions/1086#discussioncomment-3327565. https://bugs.gentoo.org/837362 for 4.6 issue. https://bugs.gentoo.org/883799 and https://bugs.gentoo.org/887019 fo 4.8 issue. --- a/src/ccache/Config.cpp +++ b/src/ccache/Config.cpp @@ -1193,17 +1193,5 @@ Config::check_key_tables_consistency() std::string Config::default_temporary_dir() const { - static const std::string run_user_tmp_dir = [] { -#ifndef _WIN32 - const char* const xdg_runtime_dir = getenv("XDG_RUNTIME_DIR"); - if (xdg_runtime_dir && DirEntry(xdg_runtime_dir).is_directory()) { - auto dir = FMT("{}/ccache-tmp", xdg_runtime_dir); - if (fs::create_directories(dir) && access(dir.c_str(), W_OK) == 0) { - return dir; - } - } -#endif - return std::string(); - }(); - return !run_user_tmp_dir.empty() ? run_user_tmp_dir : m_cache_dir + "/tmp"; + return m_cache_dir + "/tmp"; }