add policy to force enable fallback module dependency scanner

1 files changed, 6 insertions, 3 deletions

diff --git a/tests/projects/c++/modules/test_headerunits.lua b/tests/projects/c++/modules/test_headerunits.lua
index 6a942e583..3b664c96c 100644
--- a/tests/projects/c++/modules/test_headerunits.lua
+++ b/tests/projects/c++/modules/test_headerunits.lua
@@ -21,19 +21,22 @@ function main(t)
     elseif is_host("linux") then
         local gcc = find_tool("gcc", {version = true})
         if gcc and gcc.version and semver.compare(gcc.version, "11.0") >= 0 then
-            os.exec("xmake f -c --yes")
+            -- gcc trtbd dependency detection doesn't support header units atm
+            os.exec("xmake f --policies=build.c++.gcc.fallbackscanner -c --yes")
             _build()
         end
         local clang = find_tool("clang", {version = true})
         if clang and clang.version then
             if semver.compare(clang.version, "15.0") >= 0 then
                 os.exec("xmake clean -a")
-                os.exec("xmake f --toolchain=clang -c")
+                -- clang-scan-deps dependency detection doesn't support header units atm
+                os.exec("xmake f --toolchain=clang --policies=build.c++.clang.fallbackscanner -c")
                 _build()
             -- elseif semver.compare(clang.version, "15.0") >= 0 then
             -- there is currently a bug on llvm git that prevent to build STL header units https://github.com/llvm/llvm-project/issues/58540
             -- os.exec("xmake clean -a")
-            -- os.exec("xmake f --toolchain=clang --cxxflags=\"-stdlib=libc++\" -c")
+            -- clang-scan-deps dependency detection doesn't support header units atm
+            -- os.exec("xmake f --toolchain=clang  --policies=build.c++.modules.fallbackscanner.clang --cxxflags=\"-stdlib=libc++\" -c")
             -- _build()
             end
         end