URL:
<http://savannah.gnu.org/bugs/?48360>
Summary: Environment variable doesn't loose specialness,
although redefined
Project: make
Submitted by: stefanb
Submitted on: Fri 01 Jul 2016 11:38:24 AM GMT
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 4.2
Operating System: None
Fixed Release: None
Triage Status: None
_______________________________________________________
Details:
A variable inherited from environment doesn't loose it's specialness, although
flavor/origin don't show specialness anymore.
Test makefile:
# work arounds:
#undefine CC
#override undefine CC
$(info Origin BEFORE: $(origin CC))
$(info Flavor BEFORE: $(flavor CC))
CC = $(error BOOM!)
$(info Origin AFTER: $(origin CC))
$(info Flavor AFTER: $(flavor CC))
all:
@env | grep CC || true
Test run:
$ make
Origin BEFORE: default
Flavor BEFORE: recursive
Origin AFTER: file
Flavor AFTER: recursive
# error case
$ CC= make
Origin BEFORE: environment
Flavor BEFORE: recursive
Origin AFTER: file
Flavor AFTER: recursive
Makefile:7: *** BOOM!. Stop.
$ make CC=
Origin BEFORE: command line
Flavor BEFORE: recursive
Origin AFTER: command line
Flavor AFTER: recursive
MAKEFLAGS= -- CC=
CC=
In the error case CC retains its environment flavor but the contents are
defined by the makefile. Thus preparing the environment for the command
execution will trigger the $(error).
BTW: you can replace CC with SOME_VAR, i.e. a non-default variable, and the
test case still fails the same way.
This is probably closely related to the following bugs
* bug #35323 <https://savannah.gnu.org/bugs/?35323>
* bug #46585 <https://savannah.gnu.org/bugs/?46585>
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