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Deal with GMake Makefile conditional assignment operators. #6623

Merged
merged 1 commit into from
Oct 21, 2019
Merged

Deal with GMake Makefile conditional assignment operators. #6623

merged 1 commit into from
Oct 21, 2019

Commits on Oct 21, 2019

  1. Deal with Makefile conditional assignment operators. 

    Ordinarily variable assignments in Makefiles are done simply with an
unconditional assignment: the equals sign.  There are variants of this:

FOO := $(BAR)	Avoid recursively expand variables.
FOO ?= bar	Assign only if $(FOO) is not already set.
FOO += bar	Add more to a variable.
FOO != bar	Execute a shell script and assign result to $(FOO).

See also
https://www.gnu.org/software/make/manual/html_node/Conditional-Example.html
https://www.gnu.org/software/make/manual/html_node/Flavors.html
    @DavidGriffith @MikeMcQuaid
    DavidGriffith authored and MikeMcQuaid committed Oct 21, 2019
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