Follow-up Comment #1, bug #65685 (group make): Make adds '-j' to MAKEFLAGS and MFLAGS when -j is specified on the command line. When MFLAGS that contains -j is expanded in a recipe, the submake gets -j as a command line switch. This causes submake to start its own jobserver and the submake no longer participates in the parent jobserver.
$ ls makefile makefile2 $ cat makefile all:; $(MAKE) -fmakefile2 $(MFLAGS) $ cat makefile2 all:;: $ make --no-print-directory -j4 make -fmakefile2 -j4 --jobserver-auth=3,4 --no-print-directory make[1]: warning: -j4 forced in submake: resetting jobserver mode. : This was recently reported to the bash mailing list. https://lists.gnu.org/archive/html/bug-bash/2024-04/msg00078.html. Submakes don't need -j to participate in the top make's jobserver. The obvious temptation is to keep MAKEFLAGS and MFLAGS free of -j. However, -j needs to stay in MAKEFLAGS to allow makefiles to append -j to MAKEFLAGS. E.g. the following code needs -j in MAKEFLAGS. MAKEFLAGS+=-j2 This patch modifies make to avoid -j in MFLAGS. This patch keeps MAKEFLAGS intact. Ofcourse, if the user explicitly expands MAKEFLAGS in a recipe they are back to the quare one. Explicitly expanding MFLAGS in a recipe is legalized in the make manual, but explicitly expanding MAKEFLAGS is not. On top of that explicitly expanding MAKEFLAGS has other isses, see https://savannah.gnu.org/bugs/?62469. _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?65685> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/
