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src/spectral/fft.c: fail build if trying to mix aubio/fftw3 in double/single precision

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

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

@@ -64,12 +64,12 @@

 #ifdef HAVE_FFTW3F

 #if HAVE_AUBIO_DOUBLE

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

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

 #endif /* HAVE_AUBIO_DOUBLE */

 #define real_t float

-#else /* HAVE_FFTW3F */

+#elif defined (HAVE_FFTW3) /* HAVE_FFTW3F */

 #if !HAVE_AUBIO_DOUBLE

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

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

 #endif /* HAVE_AUBIO_DOUBLE */

 #define real_t double

 #endif /* HAVE_FFTW3F */