diff options
Diffstat (limited to 'xmake/modules/core/tools/clang.lua')
| -rw-r--r-- | xmake/modules/core/tools/clang.lua | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/xmake/modules/core/tools/clang.lua b/xmake/modules/core/tools/clang.lua index 1250d1a46..c264f6656 100644 --- a/xmake/modules/core/tools/clang.lua +++ b/xmake/modules/core/tools/clang.lua @@ -192,6 +192,19 @@ function _has_static_libstdcxx(self) return has_static_libstdcxx end +-- has -nostdlib++? (disable the automatic c++ runtime link, so we can link libc++/libc++abi explicitly) +function _has_nostdlibxx(self) + local has_nostdlibxx = _g._HAS_NOSTDLIBXX + if has_nostdlibxx == nil then + if self:has_flags("-nostdlib++ -Werror", "ldflags", {flagskey = "clang_nostdlibxx"}) then + has_nostdlibxx = true + end + has_nostdlibxx = has_nostdlibxx or false + _g._HAS_NOSTDLIBXX = has_nostdlibxx + end + return has_nostdlibxx +end + -- make the runtime flag -- @see https://github.com/xmake-io/xmake/issues/3546 function nf_runtime(self, runtime, opt) @@ -284,8 +297,36 @@ function nf_runtime(self, runtime, opt) end end end - if runtime:endswith("_static") and _has_static_libstdcxx(self) then - maps["stdc++_static"] = table.join(maps["stdc++_static"], "-static-libstdc++") + if runtime:endswith("_static") then + -- -static-libstdc++ only pulls in libc++.a, not libc++abi.a, so the libc++abi + -- symbols (typeinfo, __cxa_*) stay undefined and the link fails, especially + -- once c++ modules reference more of libc++. + -- + -- if we can locate both static archives, link them explicitly in a group + -- (they reference each other) and disable the driver's automatic c++ runtime + -- with -nostdlib++, otherwise (bundled abi) fall back to -static-libstdc++. + -- + -- note: target.runtimes is ordered right before the syslinks in the c++ link + -- order, so these archives are placed after the object files / user links. + -- @see https://github.com/xmake-io/xmake/issues/7442, https://github.com/xmake-io/xmake/issues/7656 + if llvm_dirs.libcxx_static and llvm_dirs.libcxxabi_static and _has_nostdlibxx(self) then + local cxxlibs = {llvm_dirs.libcxx_static, llvm_dirs.libcxxabi_static} + -- apple ld64 does not support --start-group, it always rescans archives + if not self:is_plat("macosx", "iphoneos", "watchos", "appletvos", "applexros") then + cxxlibs = table.join("-Wl,--start-group", cxxlibs, "-Wl,--end-group") + end + -- -stdlib=libc++ is unused when linking with -nostdlib++, remove it to avoid + -- the `argument unused during compilation` warning + local ldflags = table.remove_if(table.wrap(maps["c++_static"]), function (_, flag) + return flag == "-stdlib=libc++" + end) + maps["c++_static"] = table.join(ldflags, "-nostdlib++", cxxlibs) + elseif _has_static_libstdcxx(self) then + maps["c++_static"] = table.join(maps["c++_static"], "-static-libstdc++") + end + if _has_static_libstdcxx(self) then + maps["stdc++_static"] = table.join(maps["stdc++_static"], "-static-libstdc++") + end end end end |