Add support for per-job output sync.

A new flag to the -O/--output-sync, "job", selects a per-job (that is, per
line of a recipe) output synchronization.  To support this move the close of
the temp file out of the sync_output() function and don't do it until we free
the child, since we may call sync_output() multiple times in a given recipe.
When we set up for a new temp file, if we're in per-job mode we truncate the
file and seek to the beginning to re-use it for every job.

1 files changed, 5 insertions, 1 deletions

diff --git a/main.c b/main.c
index 0037587..be3d190 100644
--- a/main.c
+++ b/main.c
@@ -695,7 +695,11 @@ decode_output_sync_flags (void)
     {
       const char *p = *pp;
 
-      if (streq (p, "target"))
+      if (streq (p, "none"))
+        output_sync = OUTPUT_SYNC_NONE;
+      else if (streq (p, "job"))
+        output_sync = OUTPUT_SYNC_JOB;
+      else if (streq (p, "target"))
         output_sync = OUTPUT_SYNC_TARGET;
       else if (streq (p, "make"))
         output_sync = OUTPUT_SYNC_MAKE;