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[bug #59154] Multiline environment variables handled poorly

From: Martin Dorey
Subject: [bug #59154] Multiline environment variables handled poorly
Date: Mon, 21 Sep 2020 18:54:53 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36

Follow-up Comment #1, bug #59154 (project make):

I thought this might be related to
https://en.wikipedia.org/wiki/Shellshock_(software_bug) but make is exec()ing
the wrong command:

martind@sirius:~/tmp/make-59154$ export PUB="$(echo hello; echo world)"
martind@sirius:~/tmp/make-59154$ cat Makefile
foo:; echo PUB is "$(PUB)"
martind@sirius:~/tmp/make-59154$ strace -f make 2>&1 | grep execve
execve("/usr/bin/make", ["make"], [/* 209 vars */]) = 0
[pid 17978] execve("/bin/sh", ["/bin/sh", "-c", "echo PUB is \"hello"], [/*
212 vars */]) = 0

As is suggested by the make output:

martind@sirius:~/tmp/make-59154$ make
echo PUB is "hello
/bin/sh: 1: Syntax error: Unterminated quoted string
Makefile:1: recipe for target 'foo' failed
make: *** [foo] Error 2

make -p says PUB has an appropriate-looking definition:

define PUB

I got the same error from make-3.81, so not a recent regression, which makes
me more surprised that I haven't tripped on this.


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