[bug #63040] autoconf-2.69 and 2.71 fail to build after $(shell ...) environment handlign change

[Sergei Trofimovich]

URL:
  <https://savannah.gnu.org/bugs/?63040>

                 Summary: autoconf-2.69 and 2.71 fail to build after $(shell
...) environment handlign change
                 Project: make
               Submitter: slyfox
               Submitted: Fri 09 Sep 2022 10:35:02 AM UTC
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: None
           Fixed Release: None
           Triage Status: None


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Follow-up Comments:


-------------------------------------------------------
Date: Fri 09 Sep 2022 10:35:02 AM UTC By: Sergei Trofimovich <slyfox>
Tried to use `make` from today's git (commit
7d484017077089ac2642b89da8984ca46a07323d [SV 63016] Don't fail exporting to
$(shell ...)) and observed build failure on autoconf:


build flags: -j16 -l16 SHELL=bash
bash: line 1: env: command not found
make  all-am
bash: line 1: make: command not found
make: *** [Makefile:928: all] Error 127


The build failure happens because (I think) autoconf uses the following
trick:


cfg.mk:export PATH = $(shell echo "`pwd`/tests:$$PATH")


Comparing behaviour from `make` a few months ago:


$ make --version
GNU Make 4.3.90.20220619

$ printf 'export PATH = $(shell echo $$PWD:$$PATH)'"\n"'all:; echo $$PATH' |
make -f -
echo $PATH
/tmp:/run/current-system/sw/bin


Path is prepended to existing one, ok.

And the today's one:


$ ./make --version
GNU Make 4.3.90.20220909
$ printf 'export PATH = $(shell echo $$PWD:$$PATH)'"\n"'all:; echo $$PATH' |
./make -f -
echo $PATH
make: sh: No such file or directory
make: sh: No such file or directory
make: *** [/tmp/GmYdo0my:2: all] Error 127


If we use `:=` then it works as expected:


$ printf 'export PATH := $(shell echo $$PWD:$$PATH)'"\n"'all:; echo $$PATH' |
./make -f -
echo $PATH
/tmp:/run/current-system/sw/bin


In theory it should be easy to adapt `autoconf`s build system. Filing a bug to
make sure it's an intended change and not an unexpected regression.







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