Mex Error on Linux - redefinition of typedef

14 次查看（过去 30 天）
Jorge C.
Jorge C. 2018-3-16
回答： Himanshu 2024-10-24，6:19
I am trying to compile a mex file to interact with a C function in Matlab. My C function contains various typedefs that appear to conflict with Matlab definitions. When I run:
mex myMxFxn.c sourceFxn.c
I get several messages like this:
/jc/myCode/ft1/my_types.h:11: error: redefinition of typedef 'int8_T'
/usr2/matlab/matlab2017a/extern/include/tmwtypes.h:203: note: previous declaration of 'int8_T' was here
/jc/myCode/ft1/my_types.h:12: error: redefinition of typedef 'uint8_T'
/usr2/matlab/matlab2017a/extern/include/tmwtypes.h:218: note: previous declaration of 'uint8_T' was here
(etc...)
My definitions (in my_types.h) are:
typedef signed char int8_T;
typedef unsigned char uint8_T;
etc...
The definitions in tmwtypes.h are as follows:
typedef INT8_T int8_T;
typedef UINT8_T uint8_T;
(etc...)
If I remove my typedefs my C function falls apart. Seems like Matlab and my C code are both heavily dependent on their respective definitions of those types. How can I prevent the conflict (ideally without changing all my C type names)?

请先登录，再回答此问题。

回答（1 个）

Himanshu
Himanshu 2024-10-24，6:19
Hey,
I had also faced this issue in older versions of MATLAB; this seems to be a bug ithat was fixed in the version R2018b. So I am assuming you were using a version older than that.
The conflict arises from the redefinition of typedefs in your custom header file my_types.h and MATLAB's tmwtypes.h. You can resolve this issue by conditionally including your typedefs only when they are not already defined by MATLAB.
Modify your my_types.h file to conditionally define these types only if they haven't been defined yet. You can use preprocessor directives to check if a type is already defined:cCopy code#ifndef INT8_T, as shown in the code snippet below.
#ifndef INT8_T
typedef signed char int8_T;
#endif
#ifndef UINT8_T
typedef unsigned char uint8_T;
#endif
Hope this helps!

类别

在 Help Center 和 File Exchange 中查找有关 Write C Functions Callable from MATLAB (MEX Files) 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by