Microsoft SDK 7 does nt recognize fmax and fmin functions from math.h header

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SAID ELMOTAOUAKKEL 2019-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/462824-microsoft-sdk-7-does-nt-recognize-fmax-and-fmin-functions-from-math-h-header

编辑： Walter Roberson 2019-5-22

采纳的回答： Walter Roberson

hello everyone im trying to use mex command to compile c code but it show me erros like that

LNK2019 unresolved external symbol fmin

in the c code there are some other functions from math.h are working but fmin fmax doesnt

any help please thanks in advance

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Answer 1

Walter Roberson 2019-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/462824-microsoft-sdk-7-does-nt-recognize-fmax-and-fmin-functions-from-math-h-header#answer_375645

Sdk7.1 was 2010 timeframe and did not support C99 and in particular did not support those functions.

https://social.msdn.microsoft.com/Forums/vstudio/en-US/cec84cf0-1b6b-44c0-aa7b-8c74be602d77/where-the-is-fmax-?forum=vclanguage

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SAID ELMOTAOUAKKEL 2019-5-20

Thanks Walter but the C code is generated automatically with Simulink Coder with C89/C90 in standard math library target so it should'nt generate functions from C99 standard, do you have any idea please.

Walter Roberson 2019-5-20

编辑：Walter Roberson 2019-5-22

fmin and fmax did not exist for c89 so with that target they should not be generated, at least not unless it provides its own definition. Might be a bug in the code generation phase. Not really a Sdk7.1 bug because with that target no call to them should have been created.

In the meantime you will probably need to supply your own definition for them. Should be very straightforward unless you need to handle nan

https://en.cppreference.com/w/c/numeric/math/fmin

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