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FreeBSD 11.0 - man page for dwarf_def_macro (freebsd section 3)

DWARF_DEF_MACRO(3)					   BSD Library Functions Manual 					DWARF_DEF_MACRO(3)

dwarf_def_macro -- add a macro definition to a DWARF producer instance
DWARF Access Library (libdwarf, -ldwarf)
#include <libdwarf.h> int dwarf_def_macro(Dwarf_P_Debug dbg, Dwarf_Unsigned lineno, char *name, char *value, Dwarf_Error *err);
Function dwarf_def_macro() adds a macro definition to a DWARF producer instance. Argument dbg should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3). Argument lineno specifies the line number of the source line where the macro is defined. A line number of zero is used for macros that are defined before any source file is read. Argument name should point to a NUL-terminated string containing the name of the macro. For function-like macros this parameter should also include parentheses and parameter names if any. Argument value should point to a NUL-terminated string containing the value of the macro. If the macro doesn't have a value, argument value should be set to NULL. If argument err is not NULL, it will be used to store error information in case of an error.
On success, function dwarf_def_macro() returns DW_DLV_OK. In case of an error, function dwarf_def_macro() returns DW_DLV_ERROR and sets the argument err.
To record the fact that a macro named _STDIO_H_ was defined at line 20 of the current macro file, use: Dwarf_P_Debug dbg; Dwarf_Error de; /* ... Assume 'dbg' refers to a DWARF producer instance... */ if (dwarf_def_macro(dbg, 20, "_STDIO_H_", NULL, &de) != DW_DLV_OK) errx(EXIT_FAILURE, "dwarf_def_macro failed: %s", dwarf_errmsg(-1));
Function dwarf_def_macro() can fail with: [DW_DLE_ARGUMENT] Either arguments dbg or name was NULL. [DW_DLE_MEMORY] An out of memory condition was encountered during the execution of the function.
dwarf(3), dwarf_end_macro_file(3), dwarf_producer_init(3), dwarf_producer_init_b(3), dwarf_start_macro_file(3), dwarf_undef_macro(3), dwarf_vendor_ext(3)
November 9, 2011 BSD