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src/spectral/fft.c: add a warning if using fftw3 with aubio single

--- a/src/spectral/fft.c

+++ b/src/spectral/fft.c

@@ -37,11 +37,14 @@

 #if HAVE_FFTW3F

 #if HAVE_AUBIO_DOUBLE

 #warning "Using aubio in double precision with fftw3 in single precision"

-#endif

+#endif /* HAVE_AUBIO_DOUBLE */

 #define real_t float 

-#else

+#else /* HAVE_FFTW3F */

+#if !HAVE_AUBIO_DOUBLE

+#warning "Using aubio in single precision with fftw3 in double precision"

+#endif /* HAVE_AUBIO_DOUBLE */

 #define real_t double 

-#endif

+#endif /* HAVE_FFTW3F */

 struct _aubio_fft_t {

   uint_t winsize;