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-rw-r--r--libbuild2/cc/common.hxx1
-rw-r--r--libbuild2/cc/compile-rule.cxx10
-rw-r--r--libbuild2/cc/init.cxx7
-rw-r--r--libbuild2/cc/link-rule.cxx33
4 files changed, 43 insertions, 8 deletions
diff --git a/libbuild2/cc/common.hxx b/libbuild2/cc/common.hxx
index 6347005..cb85632 100644
--- a/libbuild2/cc/common.hxx
+++ b/libbuild2/cc/common.hxx
@@ -117,6 +117,7 @@ namespace build2
const variable& c_module_name; // cc.module_name
const variable& c_importable; // cc.importable
const variable& c_reprocess; // cc.reprocess
+ const variable& c_serialize; // cc.serialize
const variable& x_preprocessed; // x.preprocessed
const variable* x_symexport; // x.features.symexport
diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index d490c8e..2e4775e 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -7830,6 +7830,14 @@ namespace build2
if (!env.empty ())
env.push_back (nullptr);
+ // We have no choice but to serialize early if we want the command line
+ // printed shortly before actually executing the compiler. Failed that,
+ // it may look like we are still executing in parallel.
+ //
+ scheduler::alloc_guard jobs_ag;
+ if (!ctx.dry_run && cast_false<bool> (t[c_serialize]))
+ jobs_ag = scheduler::alloc_guard (*ctx.sched, phase_unlock (nullptr));
+
// With verbosity level 2 print the command line as if we are compiling
// the source file, not its preprocessed version (so that it's easy to
// copy and re-run, etc). Only at level 3 and above print the real deal.
@@ -7994,6 +8002,8 @@ namespace build2
throw failed ();
}
+ jobs_ag.deallocate ();
+
if (md.deferred_failure)
fail << "expected error exit status from " << x_lang << " compiler";
}
diff --git a/libbuild2/cc/init.cxx b/libbuild2/cc/init.cxx
index 1bddbb2..e124450 100644
--- a/libbuild2/cc/init.cxx
+++ b/libbuild2/cc/init.cxx
@@ -185,6 +185,13 @@ namespace build2
//
vp.insert<bool> ("cc.reprocess");
+ // Execute serially with regards to any other recipe. This is primarily
+ // useful when compiling large translation units or linking large
+ // binaries that require so much memory that doing that in parallel with
+ // other compilation/linking jobs is likely to summon the OOM killer.
+ //
+ vp.insert<bool> ("cc.serialize");
+
// Register scope operation callback.
//
// It feels natural to clean up sidebuilds as a post operation but that
diff --git a/libbuild2/cc/link-rule.cxx b/libbuild2/cc/link-rule.cxx
index 704fb47..08a60b9 100644
--- a/libbuild2/cc/link-rule.cxx
+++ b/libbuild2/cc/link-rule.cxx
@@ -3969,6 +3969,14 @@ namespace build2
try_rmfile (relt, true);
}
+ // We have no choice but to serialize early if we want the command line
+ // printed shortly before actually executing the linker. Failed that, it
+ // may look like we are still executing in parallel.
+ //
+ scheduler::alloc_guard jobs_ag;
+ if (!ctx.dry_run && cast_false<bool> (t[c_serialize]))
+ jobs_ag = scheduler::alloc_guard (*ctx.sched, phase_unlock (nullptr));
+
if (verb == 1)
print_diag (lt.static_library () ? "ar" : "ld", t);
else if (verb == 2)
@@ -3989,10 +3997,15 @@ namespace build2
//
// Note that we are not going to bother with oargs for this.
//
+ // Note also that we now have scheduler::serialize() which allows us to
+ // block until full parallelism is available (this mode can currently
+ // be forced with cc.serialize=true; maybe we should invent something
+ // like config.cc.link_serialize or some such which can be used when
+ // LTO is enabled).
+ //
string jobs_arg;
- scheduler::alloc_guard jobs_extra;
- if (!lt.static_library ())
+ if (!ctx.dry_run && !lt.static_library ())
{
switch (ctype)
{
@@ -4008,8 +4021,10 @@ namespace build2
auto i (find_option_prefix ("-flto", args.rbegin (), args.rend ()));
if (i != args.rend () && strcmp (*i, "-flto=auto") == 0)
{
- jobs_extra = scheduler::alloc_guard (*ctx.sched, 0);
- jobs_arg = "-flto=" + to_string (1 + jobs_extra.n);
+ if (jobs_ag.n == 0) // Might already have (see above).
+ jobs_ag = scheduler::alloc_guard (*ctx.sched, 0);
+
+ jobs_arg = "-flto=" + to_string (1 + jobs_ag.n);
*i = jobs_arg.c_str ();
}
break;
@@ -4027,8 +4042,10 @@ namespace build2
strcmp (*i, "-flto=thin") == 0 &&
!find_option_prefix ("-flto-jobs=", args))
{
- jobs_extra = scheduler::alloc_guard (*ctx.sched, 0);
- jobs_arg = "-flto-jobs=" + to_string (1 + jobs_extra.n);
+ if (jobs_ag.n == 0) // Might already have (see above).
+ jobs_ag = scheduler::alloc_guard (*ctx.sched, 0);
+
+ jobs_arg = "-flto-jobs=" + to_string (1 + jobs_ag.n);
args.insert (i.base (), jobs_arg.c_str ()); // After -flto=thin.
}
break;
@@ -4200,8 +4217,6 @@ namespace build2
if (!e)
throw failed ();
}
-
- jobs_extra.deallocate ();
}
catch (const process_error& e)
{
@@ -4281,6 +4296,8 @@ namespace build2
}
}
+ jobs_ag.deallocate ();
+
// For Windows generate (or clean up) rpath-emulating assembly.
//
if (tclass == "windows")