Update riscv-gnu-toolchain to git rev 0c8f87d

Makefile

@@ -1,5 +1,5 @@
 
-RISCV_GNU_TOOLCHAIN_GIT_REVISION = 914224e
+RISCV_GNU_TOOLCHAIN_GIT_REVISION = 0c8f87d
 RISCV_GNU_TOOLCHAIN_INSTALL_PREFIX = /opt/riscv32
 
 SHELL = bash
@@ -11,7 +11,7 @@ TOOLCHAIN_PREFIX = $(RISCV_GNU_TOOLCHAIN_INSTALL_PREFIX)i/bin/riscv32-unknown-el
 COMPRESSED_ISA = C
 
 # Add things like "export http_proxy=... https_proxy=..." here
-GIT_ENV =
+GIT_ENV = true
 
 test: testbench.vvp firmware/firmware.hex
 	vvp -N $<

README.md

@@ -612,15 +612,16 @@ The following commands will build the RISC-V GNU toolchain and libraries for a
 pure RV32I target, and install it in `/opt/riscv32i`:
 
     # Ubuntu packages needed:
-    sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev \
-            libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc
+    sudo apt-get install autoconf automake autotools-dev curl libmpc-dev \
+            libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo \
+	    gperf libtool patchutils bc zlib1g-dev git
 
     sudo mkdir /opt/riscv32i
     sudo chown $USER /opt/riscv32i
 
     git clone https://github.com/riscv/riscv-gnu-toolchain riscv-gnu-toolchain-rv32i
     cd riscv-gnu-toolchain-rv32i
-    git checkout 914224e
+    git checkout 0c8f87d
     git submodule update --init --recursive
 
     mkdir build; cd build
@@ -649,7 +650,7 @@ By default calling any of those make targets will (re-)download the toolchain
 sources. Run `make download-tools` to download the sources to `/var/cache/distfiles/`
 once in advance.
 
-*Note: This instructions are for git rev 914224e (2017-01-06) of riscv-gnu-toolchain.*
+*Note: This instructions are for git rev 0c8f87d (2017-04-05) of riscv-gnu-toolchain.*
 
 
 Linking binaries with newlib for PicoRV32

firmware/riscv.ld

@@ -1,5 +1,5 @@
 /* Default linker script, for normal executables */
-/* Copyright (C) 2014-2016 Free Software Foundation, Inc.
+/* Copyright (C) 2014-2017 Free Software Foundation, Inc.
    Copying and distribution of this script, with or without modification,
    are permitted in any medium without royalty provided the copyright
    notice and this notice are preserved.  */
@@ -125,7 +125,7 @@ SECTIONS
      we can shorten the on-disk segment size.  */
   .sdata          :
   {
-    _gp = . + 0x800;
+    __global_pointer$ = . + 0x800;
     *(.srodata.cst16) *(.srodata.cst8) *(.srodata.cst4) *(.srodata.cst2) *(.srodata .srodata.*)
     *(.sdata .sdata.* .gnu.linkonce.s.*)
   }

firmware/riscv_ld.diff

@@ -1,20 +1,20 @@
---- <(riscv32-unknown-elf-ld -z nocombreloc -verbose)	2017-01-13 16:55:07.569030165 +0100
-+++ riscv.ld	2017-01-13 16:56:47.796761642 +0100
+--- <(riscv32-unknown-elf-ld -z nocombreloc -verbose)
++++ riscv.ld
 @@ -1,9 +1,3 @@
--GNU ld (GNU Binutils) 2.28.51.20170101
+-GNU ld (GNU Binutils) 2.28.0.20170322
 -  Supported emulations:
 -   elf32lriscv
 -   elf64lriscv
 -using internal linker script:
 -==================================================
  /* Default linker script, for normal executables */
- /* Copyright (C) 2014-2016 Free Software Foundation, Inc.
+ /* Copyright (C) 2014-2017 Free Software Foundation, Inc.
     Copying and distribution of this script, with or without modification,
 @@ -13,62 +7,26 @@
  	      "elf32-littleriscv")
  OUTPUT_ARCH(riscv)
  ENTRY(_start)
--SEARCH_DIR("/opt/new_riscv32i/riscv32-unknown-elf/lib");
+-SEARCH_DIR("/opt/riscv32i/riscv32-unknown-elf/lib");
  SECTIONS
  {
 -  /* Read-only sections, merged into text segment: */