Merge pull request #868 from frantony/riscv

add RISC-V architecture support

config/arch/riscv.in

@@ -0,0 +1,10 @@
+# RISC-V specific config options
+
+## depends on EXPERIMENTAL
+##
+## select ARCH_SUPPORTS_32
+## select ARCH_DEFAULT_32
+## select GCC_REQUIRE_7_or_later
+
+## help The RISC-V architecture, as defined by:
+## help     http://www.riscv.org/

samples/riscv32-unknown-elf/crosstool.config

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+CT_EXPERIMENTAL=y
+CT_ARCH_RISCV=y
+CT_TARGET_VENDOR=""
+CT_LIBC_NONE=y
+# CT_CC_GCC_LDBL_128 is not set

samples/riscv32-unknown-elf/reported.by

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+reporter_name="Antony Pavlov"
+reporter_url="https://github.com/frantony/crosstool-ng"
+reporter_comment=""

scripts/build/arch/riscv.sh

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+# Compute RISC-V-specific values
+
+CT_DoArchTupleValues() {
+    CT_TARGET_ARCH="riscv${CT_ARCH_BITNESS}"
+}