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張 旭

Makefiles - Best practices and suggestions | MDN - 0 views

developer.mozilla.org/...Best_practices_and_suggestions

linux makefile programming development

shared by 張 旭 on 24 Dec 18 - No Cached
  • hardcoded values - avoid them like the plague
  • For classes of hardware (unix/windows) place your makefile in a subdirectory, unix/Makefile.in
  • Initial make call should always be the workhorse: build, generate, deploy, install, etc.
  • ...6 more annotations...
  • All subsequent make calls must become a NOP unless sources or dependencies change or have been removed.
    • 張 旭
      張 旭 on 24 Dec 18
       
      No Operation 或 No Operation Performed 的縮寫，意為無操作
    • 張 旭
      張 旭 on 24 Dec 18
  • Do not use directories as a dependency for generated targets, ever.
  • Parallel make: add an explicit timestamp dependency (.done) that make can synchronize threaded calls on to avoid a race condition.
  • Maintain clean targets - makefiles should be able to remove all content that is generated so "make clean" will return the sandbox/directory back to a clean state.
  • Wrapper check/unit tests with a ENABLE_TESTS conditional
張 旭

迷途工程師: Makefile的賦值運算符(=, :=, +=, ?=) - 0 views

dannysun-unknown.blogspot.com/...makefile.html

linux makefile programming

shared by 張 旭 on 20 Dec 18 - No Cached
  • = 是最基本的賦值 := 會覆蓋變數之前的值 ?= 變數為空時才給值，不然則維持之前的值 += 將值附加到變數的後面
  • = 在執行時擴展(values within it are recursively expanded when the variable is used, not when it's declared) := 在定義時擴展(values within it are expanded at declaration time)
  • 張 旭 on 20 Dec 18
     
    "= 是最基本的賦值 := 會覆蓋變數之前的值 ?= 變數為空時才給值，不然則維持之前的值 += 將值附加到變數的後面 "
張 旭

GNU make: Special Variables - 0 views

www.gnu.org/...Special-Variables.html

linux makefile programming

shared by 張 旭 on 20 Dec 18 - No Cached
  • include inc.mk
  • .DEFAULT_GOAL
  • assigning more than one target name to .DEFAULT_GOAL is invalid and will result in an error.
  • ...6 more annotations...
  • If the variable is empty (as it is by default) that character is the standard tab character.
  • “else if” non-nested conditionals
  • .ONESHELL special target
  • target-specific and pattern-specific
  • “shortest stem” method of choosing which pattern
  • make searches for included makefiles (see Including Other Makefiles)
張 旭

153 ☞ Sourcing a shell script in Make - 0 views

blog.153.io/...source-a-shell-script-in-make

makefile programming shell script

shared by 張 旭 on 24 Dec 18 - No Cached
  • Make runs its commands in a subshell, so the variables exported by source aren’t available to other commands.
  • Make and Bash have awfully similar syntaces for setting variables
  • Make doesn’t parse quotes
  • ...2 more annotations...
  • needs to run before any target
  • If there’s a target for makefile, and its prerequisites are new, the target will run before anything, because the makefile might change.
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