Using c++ style comments in mex files.
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I'm testing simple mex functions today and I would like to add some comments. However, I noticed:
- If my comments are surrounded by "/* \*/", namely, /*comments*/, the compilation of mex file works fine.
- But if my comments are commented in the way using "//", namely, //comments, the compilation fails.
Can anybody help to explain why it is so? Does that mean, I'm not able to write comments in the way of "//comments" in Matlab mex files?
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Jan
on 26 Jan 2011
While the LCC compiler shipped with Matlab, modern LCC versions, Borland BCC, OpenWatcom, MSVC und Intel compilers understand the C99 comment style, the GCC compiler needs to enable them explicitely on Linux:
mex('CFLAGS="\$CFLAGS -std=c99"', 'File.c')
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Walter Roberson
on 22 Jan 2011
Were you using C or C++ ? C++ has always accepted // comments, but the original 1989 C standard did not accept them. If you are using the default LCC compiler then possibly it does not accept them. You may have to specifically configure your compiler to use the C99 standard if you are using C.
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Jan
on 29 Jan 2011
@James: As far as I know, only GCC without -std=c99 fails to interprete this 12 year old standard. And I do not understand, why MathWorks does not include this flag as standard in the mexopts file.
Do you know other compiler, which insiste on c89 style?
James Tursa
on 29 Jan 2011
No. I haven't researched this. I just got tired of all the problems that gcc users had with compiling my FEX submissions. Actually, I still write with the // style, I just use a simple conversion program after the fact to produce the files I submit.
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