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Accepted
Dan Jacobson
Asked: 2024-10-12 14:54:50 +0800 CST

如何使 MAKEFLAGS=--warn-undefined-variables 应用于当前 Makefile？

  • 772

是的，我读过 《将选项传达给子‘make’》 ，但我想为这个 make（而不是子 make）设置一个选项，并在 Makefile 中设置它，而不是通过命令行。

$ 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

其他人也遇到了同样的问题。

variable

1 个回答

  1. Best Answer

    来自GNU Make NEWS 文件，关于对版本 4.4.1 的项目所作的更改：

    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]>

    此外，对于 4.4 版本（可能相关）：

    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.

    由于您使用的是 GNU Make 4.3，对MAKEFLAGS变量的更改不会立即显示在 Makefile 中。

    • 4

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