How to remove the last trailing (back)slash in gnu make file?

Question

I want to write a make file to compile my source code. I have to put in my make file the includes paths but i have a lot of folders with source codes. In make file i have a list with all .c files like this :

__MDA_SRC = \
$(__VIEWPATH)\f_03\test\mda\src\mda.c

now i need to find out the path of this file.

I tried this one :

__PATHS_FEATURE = \
$(dir $(__MDA_SRC ))

__INCLUDE_PATHES := \
-I$(__PATHS_FEATURE)

but i have an error F100: cannot open ...bla bla..

i supposed that the problem is on the path, because the path is extructed with the last backslash like: ..\..\..\..\..\f_03\test\mda\src\

How could i have the path without the last backslash like this : ..\..\..\..\..\f_02\hydraulic\btc\src

Etan Reisner · Accepted Answer · 2018-08-31 15:28:58Z

17

That seems unlikely to be the problem to me but you can remove it with

$(__PATHS_FEATURE:\=)

or

$(patsubst %\,%,$(__PATHS_FEATURE))

edited Aug 31, 2018 at 15:28

answered Oct 14, 2015 at 13:22

Etan Reisner

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4 Comments

Compholio Over a year ago

it looks to me like you are you are missing a percent there: $(patsubst %\,%,$(__PATHS_FEATURE))

Etan Reisner Over a year ago

@Compholio Indeed. Good catch.

sherrellbc Over a year ago

Heh. I approached this like "first copy/paste and see if it works, then try to understand". But it was working. Then I realized I was on a UNIX-based system where the "trailing slash" is a forward slash. Oof. +1.

SWdV Over a year ago

Docs for these 'substitution references'

Paradom · Accepted Answer · 2020-04-28 00:32:31Z

3

This may not work for your problem since your path is not absolute, however the 'abspath' and 'realpath' indirectly do what you are looking for. 'realpath' will remove the last forward slash as well as any . .. or repeated /

pathwslash=/dirs/and/more/dirs/
path=$(realpath $(pathwslash))

echo $(path) # /dirs/and/more/dirs

Here is some documentation for some other functions that may be helpful: https://www.gnu.org/software/make/manual/html_node/File-Name-Functions.html

answered Apr 28, 2020 at 0:32

Paradom

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