Re: Problem with shell regex and Make

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Ok thanks, for this help.



Bob Proulx <address@hidden>:
> address@hidden wrote:
> > This not not work on GNU Make 3.81 :
>
> The problem is that you are using shell syntax specific to bash, ksh,
> other shells but isn't in /bin/sh.  In order to use syntax that isn't
> portable shell syntax then you need to select a different shell.  Or
> you need to use portable syntax available in /bin/sh only.
>
> > all:
> >     if [[ "mystring" =~ "string" ]]; \
> >     then echo "found"; \
> >     else echo "not found"; \
> >     fi
> >
> >
> > output :
> > /bin/sh: [[: not found
>
> The problem is that you are using syntax that isn't supported by
> /bin/sh.  You have probably become used to programming in bash, ksh,
> or some other new shell that has that syntax.  But make uses /bin/sh
> by default and that shell doesn't support the [[ ... ]] syntax.
>
> See this section of the manual where it discusses how your execution
> shell is selected.
>
>   http://www.gnu.org/software/make/manual/make.html#Execution
>
>   The program used as the shell is taken from the variable SHELL. If
>   this variable is not set in your makefile, the program /bin/sh is used
>   as the shell.
>
> I recommend using portable shell syntax in your Makefile.
> Alternatively you can specify your shell to be "SHELL = /bin/bash" or
> whatever but doing so may make it a hardship for anyone else to
> compile your code on their system if their system is different from
> yours.
>
> Bob
>