targetm
Variable
struct gcc_target targetm | Variable |
The target .c file must define the global targetm variable
which contains pointers to functions and data relating to the target
machine. The variable is declared in target.h ;
target-def.h defines the macro TARGET_INITIALIZER which is
used to initialize the variable, and macros for the default initializers
for elements of the structure. The .c file should override those
macros for which the default definition is inappropriate. For example:
#include "target.h" #include "target-def.h" /* Initialize the GCC target structure. */ #undef TARGET_COMP_TYPE_ATTRIBUTES #define TARGET_COMP_TYPE_ATTRIBUTES machine_comp_type_attributes struct gcc_target targetm = TARGET_INITIALIZER; |
Where a macro should be defined in the .c
file in this manner to
form part of the targetm
structure, it is documented below as a
"Target Hook" with a prototype. Many macros will change in future
from being defined in the .h
file to being part of the
targetm
structure.