Merge #13543: depends: Add RISC-V support

974f0bf depends: Mention RISC-V known compilation issue with gcc-7.3.x (Wladimir J. van der Laan)
0d1f38c depends: update zmq config.guess/config.sub for riscv support (fanquake)
409481c depends: latest config.sub (fanquake)
d7005e9 depends: latest config.guess (fanquake)
359e2e3 depends: Add RISC-V support (Wladimir J. van der Laan)

Pull request description:

  This adds support for riscv32 and riscv64 builds to the depends system.

  The change consists of documentation and build system changes. The most significant change is an update of `config.sub` and `config.guess` inside zeromq patch, as the current version does not recognize the `riscv*` host tuples (there's no new version of ZeroMQ yet with newer ones).

  Good thing: RISC-V 64-bit toolchain packages can be installed out of the box on Ubuntu 18.04+.

  I would also like to add RISC-V 64-bit executables to gitian, but this will not be possible until #12511 .

Tree-SHA512: 358ed72ee9e4ae44e7d305c09a4ff5ce5460eeb7ed915eb25d39c8f43b61e7b347f51bf0ae5d83ddb4ce8876dea7703c926b3baa3cccb4932b3bc17160d801bb

Author: laanwj

depends/.gitignore

@@ -8,3 +8,5 @@ i686*
 mips*
 arm*
 aarch64*
+riscv32*
+riscv64*

depends/Makefile

@@ -167,7 +167,7 @@ $(host_prefix)/share/config.site: check-packages
 check-packages: check-sources
 
 clean-all: clean
-	@rm -rf $(SOURCES_PATH) x86_64* i686* mips* arm* aarch64*
+	@rm -rf $(SOURCES_PATH) x86_64* i686* mips* arm* aarch64* riscv32* riscv64*
 
 clean:
 	@rm -rf $(WORK_PATH) $(BASE_CACHE) $(BUILD)

depends/README.md

@@ -25,6 +25,8 @@ Common `host-platform-triplets` for cross compilation are:
 - `x86_64-apple-darwin11` for macOS
 - `arm-linux-gnueabihf` for Linux ARM 32 bit
 - `aarch64-linux-gnu` for Linux ARM 64 bit
+- `riscv32-linux-gnu` for Linux RISC-V 32 bit
+- `riscv64-linux-gnu` for Linux RISC-V 64 bit
 
 No other options are needed, the paths are automatically configured.
 
@@ -43,6 +45,12 @@ For linux (including i386, ARM) cross compilation:
 
     sudo apt-get install curl g++-aarch64-linux-gnu g++-4.8-aarch64-linux-gnu gcc-4.8-aarch64-linux-gnu binutils-aarch64-linux-gnu g++-arm-linux-gnueabihf g++-4.8-arm-linux-gnueabihf gcc-4.8-arm-linux-gnueabihf binutils-arm-linux-gnueabihf g++-4.8-multilib gcc-4.8-multilib binutils-gold bsdmainutils
 
+For linux RISC-V 64-bit cross compilation (there are no packages for 32-bit):
+
+    sudo apt-get install curl g++-riscv64-linux-gnu binutils-riscv64-linux-gnu
+
+RISC-V known issue: gcc-7.3.0 and gcc-7.3.1 result in a broken `test_bitcoin` executable (see https://github.com/bitcoin/bitcoin/pull/13543),
+this is apparently fixed in gcc-8.1.0.
 
 Dependency Options:
 The following can be set when running make: make FOO=bar

depends/config.guess

@@ -2,7 +2,7 @@
 # Attempt to guess a canonical system name.
 #   Copyright 1992-2018 Free Software Foundation, Inc.
 
-timestamp='2018-01-26'
+timestamp='2018-07-06'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -101,12 +101,12 @@ trap "exitcode=\$?; (rm -f \$tmpfiles 2>/dev/null; rmdir \$tmp 2>/dev/null) && e
 trap "rm -f \$tmpfiles 2>/dev/null; rmdir \$tmp 2>/dev/null; exit 1" 1 2 13 15 ;
 : ${TMPDIR=/tmp} ;
  { tmp=`(umask 077 && mktemp -d "$TMPDIR/cgXXXXXX") 2>/dev/null` && test -n "$tmp" && test -d "$tmp" ; } ||
- { test -n "$RANDOM" && tmp=$TMPDIR/cg$$-$RANDOM && (umask 077 && mkdir $tmp) ; } ||
- { tmp=$TMPDIR/cg-$$ && (umask 077 && mkdir $tmp) && echo "Warning: creating insecure temp directory" >&2 ; } ||
+ { test -n "$RANDOM" && tmp=$TMPDIR/cg$$-$RANDOM && (umask 077 && mkdir $tmp 2>/dev/null) ; } ||
+ { tmp=$TMPDIR/cg-$$ && (umask 077 && mkdir $tmp 2>/dev/null) && echo "Warning: creating insecure temp directory" >&2 ; } ||
  { echo "$me: cannot create a temporary directory in $TMPDIR" >&2 ; exit 1 ; } ;
 dummy=$tmp/dummy ;
 tmpfiles="$dummy.c $dummy.o $dummy.rel $dummy" ;
-case $CC_FOR_BUILD,$HOST_CC,$CC in
+case ${CC_FOR_BUILD-},${HOST_CC-},${CC-} in
  ,,)    echo "int x;" > "$dummy.c" ;
 	for c in cc gcc c89 c99 ; do
 	  if ($c -c -o "$dummy.o" "$dummy.c") >/dev/null 2>&1 ; then
@@ -237,7 +237,7 @@ case "$UNAME_MACHINE:$UNAME_SYSTEM:$UNAME_RELEASE:$UNAME_VERSION" in
 	# Since CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM:
 	# contains redundant information, the shorter form:
 	# CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM is used.
-	echo "$machine-${os}${release}${abi}"
+	echo "$machine-${os}${release}${abi-}"
 	exit ;;
     *:Bitrig:*:*)
 	UNAME_MACHINE_ARCH=`arch | sed 's/Bitrig.//'`
@@ -894,8 +894,8 @@ EOF
 	# other systems with GNU libc and userland
 	echo "$UNAME_MACHINE-unknown-`echo "$UNAME_SYSTEM" | sed 's,^[^/]*/,,' | tr "[:upper:]" "[:lower:]"``echo "$UNAME_RELEASE"|sed -e 's/[-(].*//'`-$LIBC"
 	exit ;;
-    i*86:Minix:*:*)
-	echo "$UNAME_MACHINE"-pc-minix
+    *:Minix:*:*)
+	echo "$UNAME_MACHINE"-unknown-minix
 	exit ;;
     aarch64:Linux:*:*)
 	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
@@ -1469,7 +1469,7 @@ EOF
 exit 1
 
 # Local variables:
-# eval: (add-hook 'write-file-functions 'time-stamp)
+# eval: (add-hook 'before-save-hook 'time-stamp)
 # time-stamp-start: "timestamp='"
 # time-stamp-format: "%:y-%02m-%02d"
 # time-stamp-end: "'"