bugmake - Bugs: bug #56446, Make shouldn't be running eval...


bug #56446: Make shouldn't be running eval when expanding variables for export

Submitted by:  Mark Galeck <mark_galeck0>
Submitted on:  Thu 06 Jun 2019 01:47:17 AM UTC  
Severity:  3 - Normal Item Group:  Enhancement
Status:  None Privacy:  Public
Assigned to:  None Open/Closed:  Open
Component Version:  4.2.1 Operating System:  None
Fixed Release:  None Triage Status:  None

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Tue 22 Dec 2020 06:20:54 PM UTC, comment #2: 

I agree with Robert, this looks like a documentation issue. The behavior actually looks consistent to me.

A simple way to avoid exporting certain variables/functions automatically (besides unexport) is to prefix them with an invalid character for a shell variable:

define !FUNCTION
target: $1

Aleksey Covacevice <alecov>
Thu 20 Aug 2020 07:31:28 AM UTC, comment #1: 

Yes, .EXPORT_ALL_VARIABLES should at least be documented for its danger regarding (forced) early expansion with the very first recipe being executed. This also breaks most usage of functions like error in variables.

As for this example, at least unexport FUNCTION2 helps here.

Robert Sachunsky <bertsky>
Thu 06 Jun 2019 01:47:17 AM UTC, original submission:  

This is a good Makefile (SSCCE example) that nevertheless bombs:

target: $1

FUNCTION2 = $(eval $(call FUNCTION,$1))


    echo OK

Now when you make this, you get:

Makefile:5: *** prerequisites cannot be defined in recipes.  Stop.

Paul Smith suggested I file this request for enhancement:  Make shouldn't be running eval when expanding variables for export. 

Mark Galeck <mark_galeck0>


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