Add a convenience variable that allows us to use 'ifdef dry_run...endif' in Makefiles or '[ -v dry_run ]' in shell scripts to test whether make was invoked with '-n'. See [1] for an explanation of this particular construction. [1]: https://www.gnu.org/software/make/manual/make.html#Testing-Flags Signed-off-by: Vegard Nossum <vegard.nossum@xxxxxxxxxx> --- Makefile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Makefile b/Makefile index 58f3843ccfac6..953951157ec92 100644 --- a/Makefile +++ b/Makefile @@ -22,6 +22,11 @@ $(if $(filter __%, $(MAKECMDGOALS)), \ PHONY := __all __all: +# Was make invoked with --dry-run/-n? Record this in a convenience variable. +ifeq (n,$(findstring n,$(firstword -$(MAKEFLAGS)))) +export dry_run := 1 +endif + # We are using a recursive build, so we need to do a little thinking # to get the ordering right. # -- 2.34.1
