I ran across a small (apparent) regression today. Here is a little
reproducer: First the makefile:
$ cat makefile
export SHELL := /bin/bash
fooshell := ./fooshell
SHELL = env a=b $(fooshell)
# ^^^ 3.82 works, with or without "env". 4.2.1 requires "env".
.PHONY: all
all:
@echo \
"This is a test"
And now the replacement $(SHELL) script, fooshell:
$ cat fooshell
#!/bin/bash
shift
echo "\$a is $a"
eval "$@"
Originally, we redefined SHELL in the makefile as
SHELL = a=b $(fooshell)
That is, add an environment variable "a=b" to each instance of fooshell.
This works as expected with gmake-3.82. However, with gmake-4.2.1,
the recipe for the target "all" behaves as if the backslash after echo
disappeared: Each physical line is passed to a separate instance of
fooshell, which naturally complains:
/bin/sh: line 1: "This is a test": command not found
I can fix the problem by explicitly running the shell under "env",
as shown. And this fix is good enough, I imagine. However, perhaps
there is some other finer point I have missed, so I will pass it along
as an observation/question.
Thank you,
Lee Busby
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