[ET Trac] [Einstein Toolkit] #1735: support FFTW3_LIBS FFTW3_INC_DIRS FFTW3_LIB_DIRS in FFTW3 ExternalLibrary

[Einstein Toolkit]

#1735: support FFTW3_LIBS FFTW3_INC_DIRS FFTW3_LIB_DIRS in FFTW3 ExternalLibrary
------------------------------------+---------------------------------------
  Reporter:  rhaas                  |       Owner:  eschnett hinder    
      Type:  enhancement            |      Status:  reopened           
  Priority:  major                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  FFTW3              
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Comment (by rhaas):

 That was indeed an incorrect statement. I had read:
 {{{
 FFTW3_LIBS="fftw3"
 }}}
 instead of
 {{{
 : ${FFTW3_LIBS="fftw3"}
 }}}
 since I was completely unaware of the form ${parameter=word} and only knew
 of ${parameter:=word} so completely mis-parsed the code based on patterns
 of code that I expected to find. Bash's syntax is really quite strange, in
 particular since ":" is basically the command "true" so really we only
 need side effects and any do-nothing shell command would do.

 Being able to specify "odd" include directories (that are not called
 "include") from the option list is still required for using MKL though, so
 that configuration.ccl changes are still something I'd like to commit.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1735#comment:6>
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