doxygen >= 1.8.8 needs an additionnal EXTENSION_MAPPING

Author: Damien Nadé

Doxyfile

@@ -238,7 +238,7 @@ OPTIMIZE_OUTPUT_VHDL   = NO
 # (default is Fortran), use: inc=Fortran f=C. Note that for custom extensions
 # you also need to set FILE_PATTERNS otherwise the files are not read by doxygen.
 
-EXTENSION_MAPPING      =
+EXTENSION_MAPPING      = sh=C
 
 # If you use STL classes (i.e. std::string, std::vector, etc.) but do not want
 # to include (a tag file for) the STL sources as input, then you should