LM32: Add toolchain configuration; Add Toolchain.defs.

arch/arm/src/armv7-r/Kconfig

@@ -162,7 +162,7 @@ config ARMV7R_TOOLCHAIN_GNU_OABI
 	---help---
 		This option should work for any GNU toolchain configured for arm-elf-.
 
-endchoice # ARMV7R_HAVE_L2CC
+endchoice # Toolchain Selection
 
 config ARMV7R_OABI_TOOLCHAIN
 	bool "OABI (vs EABI)"

arch/misoc/src/lm32/Kconfig

@@ -5,4 +5,28 @@
 
 if ARCH_CHIP_LM32
 
+choice
+	prompt "Toolchain Selection"
+	default LM32_TOOLCHAIN_GNUW if HOST_WINDOWS
+	default LM32_TOOLCHAIN_GNUL if !HOST_WINDOWS
+
+config LM32_TOOLCHAIN_BUILDROOT
+	bool "Buildroot (Cygwin or Linux)"
+	depends on !WINDOWS_NATIVE
+
+config LM32_TOOLCHAIN_GNUL
+	bool "Generic GNU toolchain under Linux (or other POSIX environment)"
+	---help---
+		This option should work for any modern GNU toolchain (GCC 4.5 or newer)
+		configured for lm32-elf-.
+
+config LM32_TOOLCHAIN_GNUW
+	bool "Generic GNU toolchain under Windows"
+	depends on HOST_WINDOWS
+	---help---
+		This option should work for any modern GNU toolchain (GCC 4.5 or newer)
+		configured for lm32-elf-.
+
+endchoice # Toolchain Selection
+
 endif # ARCH_CHIP_LM32

arch/misoc/src/lm32/Toolchain.defs

@@ -0,0 +1,104 @@
+############################################################################
+# arch/misco/src/lm32/Toolchain.defs
+#
+#   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Setup for the selected toolchain
+
+#
+# Select and allow the selected toolchain to be overridden by a command-line
+#selection.
+#
+
+ifeq ($(filter y, \
+      $(CONFIG_LM32_TOOLCHAIN_BUILDROOT) \
+    ),y)
+  CONFIG_LM32_TOOLCHAIN ?= BUILDROOT
+endif
+
+ifeq ($(filter y, \
+      $(CONFIG_LM32_TOOLCHAIN_GNUL) \
+    ),y)
+  CONFIG_LM32_TOOLCHAIN ?= GNUL
+endif
+
+ifeq ($(filter y, \
+      $(CONFIG_LM32_TOOLCHAIN_GNUW) \
+    ),y)
+  CONFIG_LM32_TOOLCHAIN ?= GNUW
+endif
+
+#
+# Supported toolchains
+#
+# Each toolchain definition should set:
+#
+#  CROSSDEV         The GNU toolchain triple (command prefix)
+#  ARCROSSDEV       If required, an alternative prefix used when
+#                   invoking ar and nm.
+#  ARCHCPUFLAGS     CPU-specific flags selecting the instruction set
+#                   FPU options, etc.
+#  MAXOPTIMIZATION  The maximum optimization level that results in
+#                   reliable code generation.
+#
+
+ifeq ($(CONFIG_DEBUG_CUSTOMOPT),y)
+  MAXOPTIMIZATION := $(CONFIG_DEBUG_OPTLEVEL)
+endif
+
+# NuttX buildroot under Linux or Cygwin
+
+ifeq ($(CONFIG_LM32_TOOLCHAIN),BUILDROOT)
+  CROSSDEV ?= lm32-nuttx-elf-
+  ARCROSSDEV ?= lm32-nuttx-elf-
+  MAXOPTIMIZATION ?= -Os
+endif
+
+# Generic GNU toolchain on OS X, Linux or any typical Posix system
+
+ifeq ($(CONFIG_LM32_TOOLCHAIN),GNUL)
+  CROSSDEV ?= lm32-elf--
+  ARCROSSDEV ?= lm32-elf--
+  MAXOPTIMIZATION ?= -Os
+endif
+
+# Generic GNU toolchain under Windows (native)
+
+ifeq ($(CONFIG_LM32_TOOLCHAIN),GNUW)
+  CROSSDEV ?= lm32-elf--
+  ARCROSSDEV ?= lm32-elf--
+  MAXOPTIMIZATION ?= -Os
+  ifeq ($(CONFIG_WINDOWS_CYGWIN),y)
+    WINTOOL = y
+  endif
+endif

configs/misoc/hello/Make.defs

@@ -36,7 +36,7 @@
 
 include ${TOPDIR}/.config
 include ${TOPDIR}/tools/Config.mk
-CROSSDEV = lm32-elf-
+include ${TOPDIR}/arch/misoc/src/lm32/Toolchain.defs
 
 LDSCRIPT = ld.script