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| -rw-r--r-- | src/development/make.md | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/development/make.md b/src/development/make.md index 254a7d7..fdef47e 100644 --- a/src/development/make.md +++ b/src/development/make.md @@ -137,5 +137,40 @@ Resolve each file name as canonical path. $(realpath fname1 fname2 ..) ``` +## Examples + +### Config based settings +```make +conf-y := default +conf-$(FOO) := $(conf-y) foo +conf-$(BAR) := $(conf-y) bar + +libs-y := libdef +libs-$(FOO) += libfoo +libs-$(BAR) += libbar + +all: + @echo "conf-y: $(conf-y)" + @echo "libs-y: $(libs-y)" +``` +Yields the following results. +```sh +$ make +conf-y: default +libs-y: libdef + +$ make FOO=y +conf-y: default foo +libs-y: libdef libfoo + +$ make BAR=y +conf-y: default bar +libs-y: libdef libbar + +$ make FOO=y BAR=y +conf-y: default foo bar +libs-y: libdef libfoo libbar +``` + [make-var-override]: https://www.gnu.org/software/make/manual/html_node/Overriding.html [make-patsubst]: https://www.gnu.org/software/make/manual/html_node/Text-Functions.html#index-patsubst-1 |