------- Additional Comments From c dot lemmen at fz-juelich dot de 2005-06-12 11:36 ------- > "gfortran -x f95-cpp-input" works > maybe this should be documented.
This is not the same. 1) The -x <language> option states that ALL following input files should be treated as being of type <language"> 2) The former -cpp option stated that all following SOURCE files should be preprocessed In many legacy Makefiles, subroutines are compiled into object files, and in a last step the main code ist compiled and linked to all dependencies in ONE step, like gfortran main.f90 -o main sub1.o sub2.o sub3.o Now, for code with preprocessor directives, with other compilers you can specify to precompile the sources, like f90 -cpp main.f90 -o main sub1.o sub2.o sub3.o With gfortran and the -cpp option gone, someone who replaces the -cpp with -x f95-cpp-input (easy to do with FLAGS), a la gfortran -x f95-cpp-input main.f90 -o main sub1.o sub2.o sub3.o doesn't compile properly, since the binary object files are read as source (to be preprocessed) You would need to specify another -x object-input (or similar) before the object files, that makes it significantly harder to adjust or write Makefiles. Alternatively, all source must be compiled first and linked in a separate step. As stated above, this rather clean version is not considered in lots of existing Makefiles. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18428
