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-rw-r--r--libbuild2/cc/compile-rule.cxx26
1 files changed, 16 insertions, 10 deletions
diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index aefcc30..7abd23d 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -7074,7 +7074,8 @@ namespace build2
// If we are building a module interface or partition, then the target
// is bmi*{} and it may have an ad hoc obj*{} member. For header units
// there is no obj*{} (see the corresponding add_adhoc_member() call in
- // apply()).
+ // apply()). For named modules there may be no obj*{} if this is a
+ // sidebuild (obj*{} is already in the library binary).
//
path relm;
path relo;
@@ -7237,7 +7238,7 @@ namespace build2
// Note also that what we are doing here appears to be incompatible
// with PCH (/Y* options) and /Gm (minimal rebuild).
//
- // @@ MOD: TODO deal with absent relo.
+ // @@ MOD: TODO deal with absent relo (sidebuild).
//
if (find_options ({"/Zi", "/ZI", "-Zi", "-ZI"}, args))
{
@@ -7492,8 +7493,6 @@ namespace build2
}
case compiler_type::clang:
{
- // @@ MOD TODO: deal with absent relo.
-
relm = relative (tp);
args.push_back ("-o");
@@ -7501,7 +7500,7 @@ namespace build2
args.push_back ("--precompile");
// Without this option Clang's .pcm will reference source
- // files. In our case this file may be transient (.ii). Plus,
+ // files. In our case this file may be transient (.ii). Plus,
// it won't play nice with distributed compilation.
//
args.push_back ("-Xclang");
@@ -7742,16 +7741,23 @@ namespace build2
// Clang's module compilation requires two separate compiler
// invocations.
//
- // @@ MODPART: Clang (all of this is probably outdated).
+ // Note that if relo is empty, then there is no need for an object file
+ // (sidebuild).
//
- if (ctype == compiler_type::clang &&
- (ut == unit_type::module_intf ||
- ut == unit_type::module_intf_part ||
- ut == unit_type::module_impl_part))
+ if (ctype == compiler_type::clang &&
+ (ut == unit_type::module_intf ||
+ ut == unit_type::module_intf_part ||
+ ut == unit_type::module_impl_part) &&
+ !relo.empty ())
{
// Adjust the command line. First discard everything after -o then
// build the new "tail".
//
+ // Note that Clang will warn about unused command line options like
+ // -I. Feels like it's easier to just suppress the warning than to
+ // recreate the command line from scratch. Hopefully this will go away
+ // once we switch to -fmodule-output.
+ //
args.resize (out_i + 1);
args.push_back (relo.string ().c_str ()); // Produce .o.
args.push_back ("-c"); // By compiling .pcm.