Huh, funny thing. I had to use a heavy-ion collision simulation program written in fortran, which had to be compiled using a certain compiler implementation (1)

Huh, funny thing. I had to use a heavy-ion collision simulation program written in fortran, which had to be compiled using a certain compiler implementation (1). After a 2-3 weeks of debugging and trying different compilers in vein, my supervisor had put me on a phone with a guy that was more successful than me and told me which fortran compiler to use. (1) Each compiler gave different results: compilation errors, code that goes in an infinite loop.