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Issue with compiling C code on Ubuntu 22.04.2 LTS. for Windows using MinGW-w64 cross-compiler

I am trying to compile a C code on Ubuntu 22.04.2 LTS, targeting Windows, using the MinGW-w64 cross-compilation toolchain. However, I'm encountering an error related to the OpenSSL headers not being found during the compilation process.

I have already installed the libssl-dev package, which should provide the necessary headers.

snave@1080gems:~/Izoh$ ls /usr/include/openssl |grep ssl
opensslv.h
ossl_typ.h
prov_ssl.h
ssl.h
ssl2.h
ssl3.h
sslerr.h
sslerr_legacy.h

I even added openssl location when running it:
x86_64-w64-mingw32-gcc -o crypto.exe crypto.c -lssl -lcrypto -I/usr/include/openssl -L/usr/lib -lws2_32
--I Searched online how to do that.

But I'm still getting the error:
fatal error: openssl/rsa.h: No such file or directory
Am I missing something in the compilation process?

I will appreciate any help. Thank you!

Solution

  • You added

    I/usr/include/openssl

    and one of your error messages is

     fatal error: openssl/rsa.h: No such file or directory

    When you added I/usr/include/openssl, files will be searched from that point. The #include <openssl/rsa.h> line will cause the compiler to look for the file

    /usr/include/openssl/openssl/rsa.h

    which doesn't exist. You need to

    1. Use the standard -I/usr/include path and not -I/usr/include/openssl
    2. Include OpenSSL headers in your code with #include <openssl/rsa.h> and not #include <rsa.h>

    For example, see this OpenSSL documentation for RSA_free():

    SYNOPSIS

    #include <openssl/rsa.h>

RSA *RSA_new(void);

void RSA_free(RSA *rsa);

    Note it's #include <openssl/rsa.h>.