Build configuration and platform

Compile-time feature, architecture, OS and ABI macros resolved at configure time and emitted into the build-generated rlib/rconfig.h. More...

Optional subsystems
Defined when the corresponding subsystem was compiled in.
#define	RLIB_HAVE_THREADS
	Threads, mutexes and TLS are available.
#define	RLIB_HAVE_MODULES
	Dynamic module loading is available.
#define	RLIB_HAVE_SIGNALS
	Signal timers are available.
#define	RLIB_HAVE_FILES
	File and filesystem APIs are available.
#define	RLIB_HAVE_SOCKETS
	Socket and networking APIs are available.
#define	RLIB_HAVE_ALLOCA_H
	<alloca.h> is present on the host.

Target architecture
Exactly one is defined, for the architecture being built.
#define	R_ARCH_X86
	Targeting 32-bit x86.
#define	R_ARCH_X86_64
	Targeting 64-bit x86-64.
#define	R_ARCH_IA64
	Targeting Itanium (IA-64).
#define	R_ARCH_ARM
	Targeting 32-bit ARM.
#define	R_ARCH_THUMB
	Targeting ARM Thumb.
#define	R_ARCH_AARCH64
	Targeting 64-bit ARM (AArch64).
#define	R_ARCH_SPARC
	Targeting SPARC.
#define	R_ARCH_XTENSA
	Targeting Xtensa.

Target operating system
Defined for the OS being built; R_OS_UNIX also covers the Unix-like family (Linux / BSD / Darwin).
#define	R_OS_BARE_METAL
	Targeting a bare-metal / no-OS environment.
#define	R_OS_WIN32
	Targeting Windows.
#define	R_OS_UNIX
	Targeting a Unix-like OS.
#define	R_OS_LINUX
	Targeting Linux.
#define	R_OS_BSD
	Targeting a BSD.
#define	R_OS_DARWIN
	Targeting macOS / Darwin.
#define	R_OS_RTEMS
	Targeting RTEMS.

Type sizes (bytes)
#define	RLIB_SIZEOF_VOID_P   8
	sizeof(void*) on the host.
#define	RLIB_SIZEOF_INT   4
	sizeof(int) on the host.
#define	RLIB_SIZEOF_LONG   8
	sizeof(long) on the host.
#define	RLIB_SIZEOF_INTMAX   8
	sizeof(rintmax) on the host.
#define	RLIB_SIZEOF_SIZE_T   8
	sizeof(rsize) on the host.

getaddrinfo hint flags
Mirror the platform's AI_* constants for DNS resolution.
#define	R_AI_PASSIVE
	Address is intended for bind (passive socket).
#define	R_AI_CANONNAME
	Request the canonical host name.
#define	R_AI_NUMERICHOST
	Treat the host string as a numeric address only.
#define	R_AI_V4MAPPED
	Return IPv4-mapped IPv6 addresses if no IPv6 found.
#define	R_AI_ALL
	Return both IPv6 and IPv4-mapped addresses.
#define	R_AI_ADDRCONFIG
	Only return families configured on the host.

Detailed Description

Compile-time feature, architecture, OS and ABI macros resolved at configure time and emitted into the build-generated rlib/rconfig.h.

The R_OS_* / R_ARCH_* macros are defined only for the target being built (test with #ifdef); the RLIB_HAVE_* flags report which optional subsystems were compiled in; the RLIB_SIZEOF_* macros give the host's type widths in bytes; and the R_AI_* macros mirror the platform's getaddrinfo hint flags.