functions

8.3 Functions for File Names

• $(dir /path/to/file.txt) - get path part only
• $(notdir src/foo.c hacks) - result foo.c hacks.
• $(suffix …)
• $(basename src/foo.c src-1.0/bar hacks) - produces the result src/foo src-1.0/bar hacks.
• $(addsuffix)
• $(addprefix)
• $(join)
• $(wildcard) - execute wildcard expansion (needed to expand wildcards in variables and arguments in functions). More: The Function wildcard
• $(realpath) - NOTE: file must exist!
• $(abspath) - NOTE: do not require file to exist

Conditional Functions - can be used also in recipes body:

• $(if)
  Example 1:

  build:
      $(if $(filter 1,$(WORKSPACE_DETECTED)), \
        @echo
        @echo "!!! Configured workspace detected: '$(WORKSPACE_PATH)'"
      )

  Example 2:

  $(if $(filter foo,bar),@echo match is broken,@echo match works)
  $(if $(filter-out foo,bar),@echo match works,@echo match is broken)