Masahiro Yamada c16b137e49 kbuild: add .SECONDARY special target to scripts/Kbuild.include ... Based on the following Linux commits: - 54a702f70589 ("kbuild: mark $(targets) as .SECONDARY and remove .PRECIOUS markers") - 8e9b61b293d9 ("kbuild: move .SECONDARY special target to Kbuild.include") GNU Make automatically deletes intermediate files that are updated in a chain of pattern rules. Example 1) %.dtb.o <- %.dtb.S <- %.dtb <- %.dts Example 2) %.o <- %.c <- %.c_shipped A couple of makefiles mark such targets as .PRECIOUS to prevent Make from deleting them, but the correct way is to use .SECONDARY. .SECONDARY Prerequisites of this special target are treated as intermediate files but are never automatically deleted. .PRECIOUS When make is interrupted during execution, it may delete the target file it is updating if the file was modified since make started. If you mark the file as precious, make will never delete the file if interrupted. Both can avoid deletion of intermediate files, but the difference is the behavior when Make is interrupted; .SECONDARY deletes the target, but .PRECIOUS does not. The use of .PRECIOUS is relatively rare since we do not want to keep partially constructed (possibly corrupted) targets. .SECONDARY with no prerequisites causes all targets to be treated as secondary. This agrees the policy of Kbuild. scripts/Kbuild.include seems a suitable place to add it because it is included from almost all sub-makes. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>		2019-01-15 15:28:53 -05:00
..
980619-1.c
20001122-1.c
20010114-2.c
20010226-1.c
acc1.c
compare-fp-1.c
darwin-ldouble.c
fpu.c
Makefile	kbuild: add .SECONDARY special target to scripts/Kbuild.include	2019-01-15 15:28:53 -05:00
mul-subnormal-single-1.c