Re: Executing Perl pattern substitution inside a Makefile

[Frazer Worley]

Thanks - got that working:

  ${QUIET} ${CAT} ${VERA_LIBRARY_DEPS} | perl -ple 's/\$$\{(\w+)\}/$$ENV{$$1}/g' >> $@

Appreciate the help.

-Frazer

On Dec 18, 2007 12:25 AM, Paul Smith < address@hidden> wrote:

On Mon, 2007-12-17 at 18:00 -0500, Frazer Worley wrote:
> perl -ple 's/\$\{(\w+)\}/$ENV{$1}/g'

Check the GNU make manual.  Any dollar sign ($) in a recipe is
interpreted as a make variable reference and expanded before the recipe
is passed to the shell.

In order to escape dollar signs, you need to double them ($$).  So, use
this instead:

       perl -ple 's/\$$\{(\w+)\}/$$ENV{$$1}/g'

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