This function will use the configured C compiler to list macro definitions (-dM -E) if use_cpp = TRUE and a compiler is available; otherwise, a simple scan of #define lines is used as a fallback.

This function will use the configured C compiler to list macro definitions (-dM -E) if use_cpp = TRUE and a compiler is available; otherwise, a simple scan of #define lines is used as a fallback.

Usage

get_defines_from_file(file, use_cpp = TRUE, cc = r_cc(), ccflags = NULL)

Arguments

file

Path to a header file

use_cpp

Logical; use the C preprocessor if available

cc

Compiler string; passed to system2 if use_cpp = TRUE.

ccflags

Additional flags for the compiler

Value

Character vector of macro names defined in file