From 5ca9980fc86242505ffdaaf62bca1fd5db26550b Mon Sep 17 00:00:00 2001 From: Kito Cheng Date: Fri, 20 Nov 2020 15:52:53 +0800 Subject: Add TARGET_COMPUTE_MULTILIB hook to override multi-lib result. Create a new hook to let target could override the multi-lib result, the motivation is RISC-V might have very complicated multi-lib re-use rule*, which is hard to maintain and use current multi-lib scripts, we even hit the "argument list too long" error when we tried to add more multi-lib reuse rule. So I think it would be great to have a target specific way to determine the multi-lib re-use rule, then we could write those rule in C, instead of expand every possible case in MULTILIB_REUSE. * Here is an example for RISC-V multi-lib rules: https://gist.github.com/kito-cheng/0289cd42d9a756382e5afeb77b42b73b gcc/ChangeLog: * common/common-target.def (compute_multilib): New. * common/common-targhooks.h (default_compute_multilib): New. * common/common-targhooks.cc (default_compute_multilib): New. * doc/tm.texi.in (TARGET_COMPUTE_MULTILIB): New. * doc/tm.texi: Regen. * gcc.cc: Include common/common-target.h. (set_multilib_dir) Call targetm_common.compute_multilib. (SWITCH_LIVE): Move to opts.h. (SWITCH_FALSE): Ditto. (SWITCH_IGNORE): Ditto. (SWITCH_IGNORE_PERMANENTLY): Ditto. (SWITCH_KEEP_FOR_GCC): Ditto. (struct switchstr): Ditto. * opts.h (SWITCH_LIVE): Move from gcc.c. (SWITCH_FALSE): Ditto. (SWITCH_IGNORE): Ditto. (SWITCH_IGNORE_PERMANENTLY): Ditto. (SWITCH_KEEP_FOR_GCC): Ditto. (struct switchstr): Ditto. --- gcc/common/common-targhooks.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'gcc/common/common-targhooks.h') diff --git a/gcc/common/common-targhooks.h b/gcc/common/common-targhooks.h index cd49c7d..1f03495 100644 --- a/gcc/common/common-targhooks.h +++ b/gcc/common/common-targhooks.h @@ -32,4 +32,15 @@ extern vec default_get_valid_option_values (int, const char *); extern const struct default_options empty_optimization_table[]; +const char * +default_compute_multilib( + const struct switchstr *, + int, + const char *multilib, + const char *, + const char *, + const char *, + const char *, + const char *); + #endif -- cgit v1.1