On 30 November 2010 14:07, Gunnar Sperber wrote: > After repeated trouble, I made the simplest possible > test. This is my program file listing: > > Knoth.f95(~)-gedit > > program nothing > end > > > and this is my attempt to make an object file: > > > ~$ gfortran -c Knoth.f95 this compiles Knoth.f95 and creates the output file Knoth.o > ~$ gfortran -o Knoth.o Now you're telling gfortran to create the output file Knoth.o, but without giving it an input file, so you get this error: > gfortran: no input files; unwilling to write output files This was because the -o option takes an argument, the name of the output file. The file exists because the first command created it: > ~$ file Knoth.o > Knoth.o : ELF 32-bit LSB relocatable, Intel 80386, version 1 > (SYSV), not stripped > What has gone wrong here? You are running two commands when you only need to run one. If you just want to compile and link Knoth.f95 just do this: gfortran Knoth.f95 That's all you need. If you really want to compile and link in two steps, you need to fix your second command: gfortran -c Knoth.f95 gfortran -o Knoth Knoth.o
