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-rw-r--r--build2/cc/compile-rule.cxx24
1 files changed, 15 insertions, 9 deletions
diff --git a/build2/cc/compile-rule.cxx b/build2/cc/compile-rule.cxx
index 7a50170..51a30ae 100644
--- a/build2/cc/compile-rule.cxx
+++ b/build2/cc/compile-rule.cxx
@@ -2824,27 +2824,33 @@ namespace build2
l6 ([&]{trace << "trying again without generated headers";});
else
{
- // In some pathological situations (e.g., we are out of disk
- // space) we may end up switching back and forth indefinitely
- // without making any headway. So we use skip_count to track
- // our progress.
+ // In some pathological situations we may end up switching
+ // back and forth indefinitely without making any headway. So
+ // we use skip_count to track our progress.
+ //
+ // Examples that have been encountered so far:
+ //
+ // - Running out of disk space.
+ //
+ // - Using __COUNTER__ in #if which is incompatible with the
+ // GCC's -fdirectives-only mode.
+ //
+ // So let's show the yo-yo'ing command lines and ask the user
+ // to investigate.
//
if (force_gen_skip && *force_gen_skip == skip_count)
{
diag_record dr (fail);
- dr << "inconsistent " << x_lang << " compiler behavior";
+ dr << "inconsistent " << x_lang << " compiler behavior" <<
+ info << "run the following two commands to investigate";
- // Show the yo-yo'ing command lines.
- //
dr << info;
print_process (dr, args.data ()); // No pipes.
init_args ((gen = true));
dr << info << "";
print_process (dr, args.data ()); // No pipes.
-
- dr << info << "perhaps you are running out of disk space?";
}
restart = true;