GNU make define MAKEFLAGS

[James]

define func
...
export MAKEFLAGS=-j1
...
endef

$(eval $(call func,...))

In the above case, MAKEFLAGS=-j1 is effective only inside the define/endef and others are not affected if "make -j5" is issued?

TIA
James

[Kaz Kylheku]

In the above, "export MAKEFLAGS=-j1" is just a piece of text
inside a variable definition, and not a directive.

The $(eval ...) causes that text to be evaluated as GNU Make syntax;
then that export takes effect. Its effect is global. After that,
make will pass that variable down as an environment variable.

The GNU Make manual also says this:

The special variable MAKEFLAGS is always exported (unless you unexport
it). MAKEFILES is exported if you set it to anything.

So "export MAKEFLAGS" is a useless use of export.

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