Where is the declaration and definition of C code corresponding to min,max,abs blocks

Question

Nagaraj Chincholli 2020-2-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/507701-where-is-the-declaration-and-definition-of-c-code-corresponding-to-min-max-abs-blocks

编辑： stozaki 2020-3-7

Hi,

If min,max,abs etc blocks related to math operations are used in simulink model, C functions corresponding to these blocks are generated in code i.e. fmaxf(), fminf(), fabsf().

For these functions, where the declaration and defintion is present? During compilation from which path declaration and definition of the function is fetched.

Can someone help me in understanding this?

Thanks in advance

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

stozaki 2020-3-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/507701-where-is-the-declaration-and-definition-of-c-code-corresponding-to-min-max-abs-blocks#answer_418995

编辑：stozaki 2020-3-7

math.zip

math.h is standard library. So, mathematical functions are defined in math.h.

https://en.wikipedia.org/wiki/C_mathematical_functions

for example, If you use MinGW compiler, you can find following folder.

MinGW\include\math.h

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

stozaki 2020-2-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/507701-where-is-the-declaration-and-definition-of-c-code-corresponding-to-min-max-abs-blocks#answer_417484

编辑：stozaki 2020-2-26

ex_min.slx

For example, min block generate model.c and model.h.

math.h is included in model.h

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Nagaraj Chincholli 2020-3-7

Hi stozaki,

I am elaborating my query.

Target selection : autosar.tlc

Case 1 : If I set the option In the model configuration parameters -> Code generation -> Interface -> Advanced parameters -> Standard math library as C89/90(ANSI), code for the abs,max and min block is generated as in the attachment C89_90_code.PNG.

In the C89/C90 (ANSI) standard, there are no standard functions so the c code for these blocks is generated in model.c file

Case 2 :If I set the option In the model configuration parameters -> Code generation -> Interface -> Advanced parameters -> Standard math library as C99(ISO), code for the abs,max and min block is generated as in the attachment C99_code.PNG.

Here, fabs(),fmin(),fmax() are generated whose declarations are included in <math.h>, I understood. I want to know in which file the definition of these functions is present?

Could you please clarify.

请先登录，再进行评论。