Hi all,

I'm using WolfSSL latest from the master branch (commit a250e1f23a5b1002c57570a29a2db3048eed1316) and the Linux SGX SDK latest from the master branch (just a few commits after 2.13.3) on Ubuntu 20.04. I've built the SGX SDK and installed it at /opt/intel/sgxsdk (default location).

When running build.sh in IDE/LINUX-SGX, I get an error "unknown type name size_t" on line 208 of wolfssl/wolfcrypt/types.h (where wc_ptr_t is defined). The error occurs with this call to gcc:

cc  -DDEBUG_WOLFSSL -Wno-implicit-function-declaration -std=c11 -m64 -O2 -nostdinc -fvisibility=hidden -fpie -fstack-protector -I/wolfssl/ -I/wolfssl/wolfcrypt/ -I/opt/intel/sgxsdk/include -I/opt/intel/sgxsdk/include/tlibc -I/opt/intel/sgxsdk/include/stlport -I/wolfssl/wolfcrypt/test -I/wolfssl/wolfcrypt/benchmark/ -fno-builtin-printf -I. -DWOLFSSL_SGX -DWOLFSSL_HAVE_SP_RSA -DWOLFSSL_HAVE_SP_DH -DWOLFSSL_HAVE_SP_ECC   -c -o /wolfssl/wolfcrypt/src/aes.o /wolfssl/wolfcrypt/src/aes.c
In file included from /wolfssl/wolfssl/wolfcrypt/error-crypt.h:34,
                 from /wolfssl/wolfcrypt/src/aes.c:36:
/wolfssl/wolfssl/wolfcrypt/types.h:208:13: error: unknown type name 'size_t'
  208 |     typedef size_t wc_ptr_t;
      |             ^~~~~~

I currently believe that the WolfSSL system of includes isn't picking up the definition of size_t in the SGX SDK's tlibc header files (which are found in /opt/intel/sgxsdk/include/tlibc).

I haven't yet dug into WolfSSL's includes to figure out how it picks up either types.h or limits.h yet, but any advice would be appreciated.

Thanks for reading!