Mex compilation error when linking with gmp on Linux

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Siddharth Advani
Siddharth Advani 2023-8-7
回答： Prateekshya 2023-8-25
I am using a mex command which works fine in Windows but when I try to mex on Linux, I get an error regarding gmp library.
I have linked to the same gmp library using GCC outside of Matlab successfully. Below is the command
gcc -x c++ -I. -L. -lstdc++ -lm -lIp_cordic_v6_0_bitacc_cmodel -Wl,-rpath,. -o run_bitacc_cmodel run_bitacc_cmodel.c
However within Matlab (tried 2019 and 2020), I get the below error:
gmp.h:37:61: error: ‘GMP_NAIL_BITS’ was not declared in this scope
#define GMP_NUMB_MASK ((~ __GMP_CAST (mp_limb_t, 0)) >> GMP_NAIL_BITS)
Below is the mex command I am using to compile the code in Matlab on Linux:
mex -lstdc++ -lm -lgmp -lIp_cordic_v6_0_bitacc_cmodel cordic_sin_cos.cpp -v
Below is the mex command I am using to compile the code in Matlab on Windows which works fine:
mex cordic_sin_cos.cpp libIp_cordic_v6_0_bitacc_cmodel.lib

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回答（1 个）

Prateekshya
Prateekshya 2023-8-25
As per my understanding, you are encountering an error related to the GMP library when attempting to use a mex command on Linux. The error message specifically mentions that "GMP_NAIL_BITS" was not declared in the scope of the "gmp.h" header file.
I assume that you have verified the installation and linking of GMP library. You can consider adding the "-D__GMP_CAST" flag to the mex command. This flag is used to define the "__GMP_CAST" macro, which might be required by the code you are compiling. The modified mex command would look like thie following:
>> mex --lstdc++ -lm -lgmp -D__GMP_CAST -lIp_cordic_v6_0_bitacc_cmodel cordic_sin_cos.cpp -v

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