In the GNU Make manual, the section "Sharing Job Slots with GNU make"
says:
Be aware that the MAKEFLAGS variable may contain multiple instances
of the --jobserver-auth= option. Only the last instance is relevant.
Take the last element of the array, not the first.
Link: https://www.gnu.org/software/make/manual/html_node/Job-Slots.html
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
scripts/jobserver-exec | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/scripts/jobserver-exec b/scripts/jobserver-exec
index 8762887a970c..4192855f5b8b 100755
--- a/scripts/jobserver-exec
+++ b/scripts/jobserver-exec
@@ -23,7 +23,9 @@ try:
opts = [x for x in flags.split(" ") if x.startswith("--jobserver")]
# Parse out R,W file descriptor numbers and set them nonblocking.
- fds = opts[0].split("=", 1)[1]
+ # If the MAKEFLAGS variable contains multiple instances of the
+ # --jobserver-auth= option, the last one is relevant.
+ fds = opts[-1].split("=", 1)[1]
reader, writer = [int(x) for x in fds.split(",", 1)]
# Open a private copy of reader to avoid setting nonblocking
# on an unexpecting process with the same reader fd.
--
2.34.1
