On Fri, 2017-05-19 at 17:07 -0700, Steve Kargl wrote:
> % which cpp
> /usr/bin/cpp
> troutmask:kargl[408] cpp --version
> FreeBSD clang version 4.0.0 (tags/RELEASE_400/final 297347) (based on
> LLVM 4.0.0)
> Target: x86_64-unknown-freebsd12.0
> Thread model: posix
> InstalledDir: /usr/bin
> troutmask:kargl[409] cpp --help |grep trad
>   -traditional-cpp        Enable some traditional CPP emulation
> troutmask:kargl[410] cpp -traditional-cpp boxmuller.F90 
> cpp: error: unable to execute command: Executable "gcc" doesn't
> exist!
> OK, so what is the preprocessor for clang?

It looks like the problem is that it sees the .F90 and wants to "do the
right thing" for fortran sources, which is "invoke gcc".  I got a clue
by adding '-###' (quotes required) to see what cpp was trying to do

You might get the effect you want by either adding something like -x
assembler-with-cpp, or maybe by hiding the filetype from cpp:

 cat boxmuller.F90 | cpp -traditional-cpp

-- Ian

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