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18.3 Host Misc

FATAL_EXIT_CODE
A C expression for the status code to be returned when the compiler exits after serious errors. The default is the system-provided macro ‘EXIT_FAILURE’, or ‘1’ if the system doesn't define that macro. Define this macro only if these defaults are incorrect.
SUCCESS_EXIT_CODE
A C expression for the status code to be returned when the compiler exits without serious errors. (Warnings are not serious errors.) The default is the system-provided macro ‘EXIT_SUCCESS’, or ‘0’ if the system doesn't define that macro. Define this macro only if these defaults are incorrect.
USE_C_ALLOCA
Define this macro if GCC should use the C implementation of alloca provided by libiberty.a. This only affects how some parts of the compiler itself allocate memory. It does not change code generation.

When GCC is built with a compiler other than itself, the C alloca is always used. This is because most other implementations have serious bugs. You should define this macro only on a system where no stack-based alloca can possibly work. For instance, if a system has a small limit on the size of the stack, GCC's builtin alloca will not work reliably.

COLLECT2_HOST_INITIALIZATION
If defined, a C statement (sans semicolon) that performs host-dependent initialization when collect2 is being initialized.
GCC_DRIVER_HOST_INITIALIZATION
If defined, a C statement (sans semicolon) that performs host-dependent initialization when a compilation driver is being initialized.
HOST_LONG_LONG_FORMAT
If defined, the string used to indicate an argument of type long long to functions like printf. The default value is "ll".
HOST_LONG_FORMAT
If defined, the string used to indicate an argument of type long to functions like printf. The default value is "l".
HOST_PTR_PRINTF
If defined, the string used to indicate an argument of type void * to functions like printf. The default value is "%p".

In addition, if configure generates an incorrect definition of any of the macros in auto-host.h, you can override that definition in a host configuration header. If you need to do this, first see if it is possible to fix configure.