Using c++ style comments in mex files.

Question

Pei JIA 2011-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/269-using-c-style-comments-in-mex-files

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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Answer 1

Jan 2011-1-26

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https://ww2.mathworks.cn/matlabcentral/answers/269-using-c-style-comments-in-mex-files#answer_591

在 MATLAB Online 中打开

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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Answer 2

Walter Roberson 2011-1-22

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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 2011-1-29

@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 2011-1-29

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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