another attempt

Author: mrodrig6

toolchain/cmake/regular/FindFFTW.cmake

@@ -1,35 +1,38 @@
-# FindFFTW.cmake — robust FFTW detection for system installs & CI
+# Generic and robust FindFFTW.cmake
 
 find_package(PkgConfig QUIET)
 if(PkgConfig_FOUND)
   pkg_check_modules(PC_FFTW QUIET fftw3)
 endif()
 
-# Search for the include directory
+# Look for FFTW headers
 find_path(FFTW_INCLUDE_DIR
   NAMES fftw3.h
   HINTS
     ${PC_FFTW_INCLUDE_DIRS}
+  PATHS
     /usr/include
     /usr/local/include
     /opt/include
+    /usr/include/x86_64-linux-gnu
 )
 
-# Search for the library
+# Look for FFTW library
 find_library(FFTW_LIBRARY
   NAMES fftw3
   HINTS
     ${PC_FFTW_LIBRARY_DIRS}
+  PATHS
     /usr/lib
     /usr/lib64
     /usr/local/lib
     /opt/lib
     /usr/lib/x86_64-linux-gnu
 )
 
-# Import handling
 include(FindPackageHandleStandardArgs)
 
+# Use version info only if it's defined and not empty
 if(DEFINED PC_FFTW_VERSION AND NOT "${PC_FFTW_VERSION}" STREQUAL "")
   find_package_handle_standard_args(FFTW
     REQUIRED_VARS FFTW_LIBRARY FFTW_INCLUDE_DIR
@@ -43,7 +46,7 @@ endif()
 
 mark_as_advanced(FFTW_INCLUDE_DIR FFTW_LIBRARY)
 
-# Optional modern target alias
+# Optional modern imported target
 if(FFTW_FOUND AND NOT TARGET FFTW::FFTW)
   add_library(FFTW::FFTW UNKNOWN IMPORTED)
   set_target_properties(FFTW::FFTW PROPERTIES