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-rw-r--r--libbuild2/cxx/init.cxx6
1 files changed, 6 insertions, 0 deletions
diff --git a/libbuild2/cxx/init.cxx b/libbuild2/cxx/init.cxx
index 0c29d41..2d897ca 100644
--- a/libbuild2/cxx/init.cxx
+++ b/libbuild2/cxx/init.cxx
@@ -481,6 +481,12 @@ namespace build2
{
case compiler_type::msvc:
{
+ // Let's enable the new preprocessor in this mode. For background,
+ // see MSVC issue 10537317.
+ //
+ if (mj > 19 || (mj == 19 && mi >= 39))
+ prepend ("/Zc:preprocessor");
+
// Starting with 15.5 (19.12) Visual Studio-created projects
// default to the strict mode. However, this flag currently tends
// to trigger too many compiler bugs. So for now we leave it to