Início / unix / Perguntas / 784953
Accepted
Dan Jacobson
Asked: 2024-10-12 14:54:50 +0800 CST

Como fazer com que MAKEFLAGS=--warn-undefined-variables se aplique ao Makefile atual?

  • 772

Sim, eu li Comunicando Opções para um Sub-'make', mas quero definir uma opção para este make, não um sub-make, e defini-la dentro do Makefile, não via linha de comando.

$ cat Makefile
MAKEFLAGS = --warn-undefined-variables
zz: $(yy); xx
$ make -n # see, it didn't work!:
xx
$ make -n --warn-undefined-variables #need to do instead.
Makefile:2: warning: undefined variable 'yy'
xx
$ make --version
GNU Make 4.3

Outros também tiveram o mesmo problema.

variable

1 respostas

  1. Best Answer

    Do arquivo GNU Make NEWS , sobre as mudanças feitas no projeto para a versão 4.4.1:

    Version 4.4.1 (26 Feb 2023)

This release is primarily a bug-fix release.
A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=110&set=custom

* WARNING: Backward-incompatibility!
  In previous releases it was not well-defined when updates to MAKEFLAGS made
  inside a makefile would be visible.  This release ensures they are visible
  immediately, even when invoking $(shell ...) functions.  Also, command line
  variable assignments are now always present in MAKEFLAGS, even when parsing
  makefiles.
  Implementation provided by Dmitry Goncharov <[email protected]>

    Além disso, para a versão 4.4 (possivelmente relacionada):

    Version 4.4 (31 Oct 2022)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=109&set=custom

[...]

* If the MAKEFLAGS variable is modified in a makefile, it will be re-parsed
  immediately rather than after all makefiles have been read.  Note that
  although all options are parsed immediately, some special effects won't
  appear until after all makefiles are read.

    Como você está usando o GNU Make 4.3, as alterações na MAKEFLAGSvariável não são imediatamente visíveis no Makefile.

    • 4

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