Cross compilers

The toolchain provided in the KasperskyOS SDK includes one or more GCC compilers. The toolchain/bin directory contains the following files:

• Executable files of compilers (for example, x86_64-pc-kos-gcc, arm-kos-g++)
• Executable files of linkers (for example, x86_64-pc-kos-ld, arm-kos-ld)
• Executable files of assemblers (for example, x86_64-pc-kos-as, arm-kos-as)

In addition to standard macros, an additional macro __KOS__=1 is defined in GCC. Use of this macro lets you simplify porting of the software code to KasperskyOS, and also simplifies development of platform-independent programs.

To view the list of standard macros of GCC, run the following command:

echo '' | aarch64-kos-gcc -dM -E -

Linker operation specifics

When building the executable file of an application, by default the linker links the following libraries in the specified order:

1. libc is the standard C library.
2. libm is the library that implements the mathematical functions of the standard C language library.
3. libvfs_stubs is the library that contains stubs of I/O functions (for example, open, socket, read, write).
4. libkos is the library for accessing the KasperskyOS core endpoints.
5. libenv is the library of the subsystem for configuring the environment of applications (environment variables, arguments of the main function, and custom configurations).
6. libsrvtransport-u is the library that supports IPC between processes and the kernel.

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