Makefile (erlang.mk) can't find file that exists-CodePudding

I am trying to build a project who's Makefile imports an erlang.mk, that imports other Makefiles and erlang.mks.

In one erlang.mk I have a grep call inside a conditional in a recipe that looks like this

if grep ^$$dep$$ $(ERLANG_MK_TMP)/deps.log; then \

and that's printing

grep: /home/forrealthough/code/rabbitmq-consistent-hash/.erlang.mk/deps.log: No such file or directory

with a return code of 2. If I put this line just before

if [ ! -f $$ERLANG_MK_TMP/deps.log ]; then echo "File not found!"; fi;\

I get a "File not found!".

The file does exist, I can cat it from the same directory and run the same if line without getting a "File not found!". Its permissions are -rw-rw-r-- and I get the same error running make with or without sudo.

Why can't my script find this file?

EDIT: I was asked to alter my if test, so here is the relevant section of my script (this is inside a recipe):

echo file: $(ERLANG_MK_TMP)/deps.log;\
if [ ! -f $(ERLANG_MK_TMP)/deps.log ]; then echo "File not found!"; fi;\
if grep ^$$dep$$ $(ERLANG_MK_TMP)/deps.log; then \

and they print

file: /home/forrealthough/rabbitmq-consistent-hash/.erlang.mk/deps.log
File not found!
grep: /home/forrealthough/rabbitmq-consistent-hash/.erlang.mk/deps.log: No such file or directory
make: *** [erlang.mk:4322: deps] Error 2

Again, the file does exist. grep returns status code=2, which I checked echoing $$?, and it runs the else part of the conditional.

EDIT 2: If I put a ls $(ERLANG_MK_TMP);\ along those other tests it lists every file inside that directory, except deps.log, which, again, is there. This fits other tests I did where I tried to access different files from this script, and deps.log is the only one that couldn't be found.

I have this same script inside this same project being built as a module of a different project (Another Makefile that imports another erlang.mk that tries to build the Makefile of the project I'm working on). There the script can find the file in question, and it runs normally.

CodePudding user response：

$(ERLANG_MK_TMP) is a make variable. $$ERLANG_MK_TMP is an (escaped) shell variable. The latter will only have a value if you export the former, it won't have any value if you just assign a make variable in the makefile without exporting it.

Why did you use two different formats here? Why not use:

if [ ! -f $(ERLANG_MK_TMP)/deps.log ]; then ...