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lib: utils: Drop dependency on libgcc by importing part of FreeBSD's libquad

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We only need libgcc for 64-bit division on RV32. Whilst GCC toolchains
bundle libgcc, Clang toolchains tend not to ship libclang_rt.builtins
given every compiler is a cross-compiler for every target and so you
would need a silly number of builds of it, with only the native library
available; only vendor-provided Clang toolchains specifically for bare
metal cross-compiling are likely to provide it.

Thus, import part of FreeBSD's implementation of the division support
functions needed and stop linking against libgcc.

Signed-off-by: Jessica Clarke <jrtc27@jrtc27.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Tested-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Jessica Clarke
2021-07-11 03:28:24 +01:00
committed by Anup Patel
parent 2942777425
commit 17729d44da
11 changed files with 683 additions and 1 deletions
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14
lib/utils/libquad/objects.mk Normal file
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@@ -0,0 +1,14 @@
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2021 Jessica Clarke <jrtc27@jrtc27.com>
#
ifeq ($(PLATFORM_RISCV_XLEN),32)
libsbiutils-objs-y += libquad/divdi3.o
libsbiutils-objs-y += libquad/moddi3.o
libsbiutils-objs-y += libquad/qdivrem.o
libsbiutils-objs-y += libquad/udivdi3.o
libsbiutils-objs-y += libquad/umoddi3.o
libsbiutils-genflags-y += -I$(libsbiutils_dir)/libquad/include
endif