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-rw-r--r--libbuild2/cc/compile-rule.cxx27
1 files changed, 24 insertions, 3 deletions
diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index b4d405b..5c811a1 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -3290,8 +3290,8 @@ namespace build2
// Note that for assembler-with-cpp GCC currently forces full
// preprocessing in (what appears to be) an attempt to paper over
// a deeper issue (see GCC bug 109534). If/when that bug gets
- // fixed, we can enable this on our side. Note also that Clang's
- // -frewrite-includes appear to work correctly on such files.
+ // fixed, we can enable this on our side. Note that Clang's
+ // -frewrite-includes also has issues (see below).
//
if (!x_assembler_cpp (src))
pp = "-fdirectives-only";
@@ -3304,7 +3304,16 @@ namespace build2
// -frewrite-includes is available since Clang 3.2.0.
//
if (cmaj > 3 || (cmaj == 3 && cmin >= 2))
- pp = "-frewrite-includes";
+ {
+ // While Clang's -frewrite-includes appears to work, there are
+ // some issues with correctly tracking location information
+ // (manifests itself as wrong line numbers in debug info, for
+ // example). The result also appears to reference the .Si file
+ // instead of the original source file for some reason.
+ //
+ if (!x_assembler_cpp (src))
+ pp = "-frewrite-includes";
+ }
break;
}
@@ -5094,6 +5103,18 @@ namespace build2
{
tracer trace (x, "compile_rule::parse_unit");
+ // Scanning .S files with our parser is hazardous since such files
+ // sometimes use `#`-style comments. Presumably real compilers just
+ // ignore them in some way, but it doesn't seem worth it to bother in
+ // our case. Also, the checksum calculation over assembler tokens feels
+ // iffy.
+ //
+ if (x_assembler_cpp (src))
+ {
+ tu.type = unit_type::non_modular;
+ return "";
+ }
+
otype ot (li.type);
// If things go wrong give the user a bit extra context. Let's call it