Using -mno-fdiv gives linker errors unless we build the missing divide
routines in libgcc always. There is at least one university project
designing RISC-V parts without FP divide that wants to use the option.
Tested by hand with single-float and double-float builds to verify that
the -mno-fdiv option works with the patch. Also tested with rv32-newlib
and rv64-linux cross builds and make check, with no regressions.
Committed.
Jim
libgcc/
* config/riscv/t-softfp32 (softfp_extra): Add FP divide routines
---
libgcc/config/riscv/t-softfp32 | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/libgcc/config/riscv/t-softfp32 b/libgcc/config/riscv/t-softfp32
index 1bd51e803d1..59be1df827e 100644
--- a/libgcc/config/riscv/t-softfp32
+++ b/libgcc/config/riscv/t-softfp32
@@ -12,7 +12,11 @@ softfp_float_modes := tf
softfp_extensions := sftf dftf
softfp_truncations := tfsf tfdf
+# Enable divide routines to make -mno-fdiv work.
+softfp_extras := divsf3 divdf3
+
else
+# !ABI_DOUBLE
softfp_float_modes := df tf
softfp_extensions := sfdf sftf dftf
@@ -20,7 +24,20 @@ softfp_truncations := dfsf tfsf tfdf
ifndef ABI_SINGLE
softfp_float_modes += sf
+else
+# ABI_SINGLE
+
+# Enable divide routines to make -mno-fdiv work.
+softfp_extras := divsf3
+
endif
endif
+
+else
+# ABI_QUAD
+
+# Enable divide routines to make -mno-fdiv work.
+softfp_extras := divsf3 divdf3 divtf3
+
endif
--
2.17.1
