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RISC-V/libgcc: Use `-fasynchronous-unwind-tables' for LIB2_DIVMOD_FUNCS 

Use `-fasynchronous-unwind-tables' rather than `-fexceptions
-fnon-call-exceptions' in LIB2_DIVMOD_FUNCS compilation flags so as to
provide unwind tables for the affected functions while not pulling the
unwinder proper, which is not required here.

Beyond saving program space it fixes a RISC-V glibc build error due to
unsatisfied `malloc' and `free' references from the unwinder causing
link errors with `ld.so' where libgcc has been built at -O0.

	libgcc/
	* config/riscv/t-elf (LIB2_DIVMOD_EXCEPTION_FLAGS): New
	variable.
This commit is contained in:
Maciej W. Rozycki 2020-09-29 01:20:01 +01:00 committed by Maciej W. Rozycki
parent e84761c6f3
commit 090d3f5ab3
1 changed files with 2 additions and 0 deletions
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libgcc/config/riscv/t-elf
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@ -4,3 +4,5 @@ LIB2ADD += $(srcdir)/config/riscv/save-restore.S \
$(srcdir)/config/riscv/div.S \
$(srcdir)/config/riscv/atomic.c \
# Avoid the full unwinder being pulled along with the division libcalls.
LIB2_DIVMOD_EXCEPTION_FLAGS := -fasynchronous-unwind-tables