[mesa-users] Inline Comments in Namelists

[Willie Strickland]

I was wondering why I have not seen this.  I often use inline comments within inlists to show values I have tried or plan to try.  But, I always place a space before and after the ! to make it easier on my old eyes.  I use MacOS and gfortran.

Willie


> On May 7, 2015, at 18:40, Richard Townsend <townsend at astro.wisc.edu> wrote:
> 
> Hi Josiah —
> 
> gfortran behaves ‘as expected’ if you put a space just before the comment. But I’m digging into this further, as it may be a compiler bug.
> 
> cheers,
> 
> Rich
> 
>> On May 7, 2015, at 6:22 PM, Josiah Schwab <jwschwab at berkeley.edu> wrote:
>> 
>> Hi All,
>> 
>> Did you know that inline comments in namelists are treated differently
>> than in the body of a program in a compiler-dependent way?  I didn't!
>> 
>> For example, in a fortran program an assignment of the form
>> 
>> val = 3.14!2.78
>> 
>> obviously assigns the value 3.14 to the variable val.
>> 
>> If you write the same thing in a fortran namelist (an inlist),
>> 
>> + with ifort, it behaves as you would naively expect
>> + with gfortran, whole line is is effectively ignored
>> 
>> I've attached a trivial test program that demonstrates this.
>> 
>> 
>> GNU Fortran (GCC) 4.9.3 20141212 (prerelease)
>> ,----
>> | henyey: ~$ gfortran -o test.x test_namelist.f90 && ./test.x
>> | 
>> | assign: val =  3.14
>> | namelist: val = -1.00
>> `----
>> 
>> ifort (IFORT) 14.0.2 20140120
>> ,----
>> | henyey: ~$ ifort -o test.x test_namelist.f90 && ./test.x
>> |
>> | assign: val =  3.14
>> | namelist: val =  3.14
>> `----
>> 
>> I spent a while today chasing a problem that boiled down to this
>> peculiarity.  I figured I'd send a mail so that someday someone will
>> think of this more quickly than I did.
>> 
>> I tried looking up the standard, but couldn't find anything specific
>> enough to tell whether this behavior is specified or undefined.
>> 
>> Best,
>> Josiah
>> 
>> <test_namelist.tar.gz>------------------------------------------------------------------------------
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> 
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