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-rw-r--r--libbuild2/cc/compile-rule.cxx40
1 files changed, 40 insertions, 0 deletions
diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index 36276f9..8526308 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -7069,6 +7069,46 @@ namespace build2
{
append_options (args, cmode);
+ // Clang 15 introduced the unqualified-std-cast-call warning which
+ // warns about unqualified calls to std::move() and std::forward()
+ // (because they can be "hijacked" via ADL). Surprisingly, this
+ // warning is enabled by default, as opposed to with -Wextra or at
+ // least -Wall. It has also proven to be quite disruptive, causing a
+ // large number of warnings in a large number of packages. So we are
+ // going to "remap" it to -Wextra for now and in the future may
+ // "relax" it to -Wall and potentially to being enabled by default.
+ // See GitHub issue #259 for background and details.
+ //
+ if (x_lang == lang::cxx &&
+ ctype == compiler_type::clang &&
+ cmaj >= 15)
+ {
+ bool w (false); // Seen -W[no-]unqualified-std-cast-call
+ optional<bool> extra; // Seen -W[no-]extra
+
+ for (const char* s: reverse_iterate (args))
+ {
+ if (s != nullptr)
+ {
+ if (strcmp (s, "-Wunqualified-std-cast-call") == 0 ||
+ strcmp (s, "-Wno-unqualified-std-cast-call") == 0)
+ {
+ w = true;
+ break;
+ }
+
+ if (!extra) // Last seen option wins.
+ {
+ if (strcmp (s, "-Wextra") == 0) extra = true;
+ else if (strcmp (s, "-Wno-extra") == 0) extra = false;
+ }
+ }
+ }
+
+ if (!w && (!extra || !*extra))
+ args.push_back ("-Wno-unqualified-std-cast-call");
+ }
+
if (md.pp != preprocessed::all)
append_sys_hdr_options (args); // Extra system header dirs (last).