Merged clang into master

arch/arm/src/armv7-m/Kconfig

@@ -108,6 +108,16 @@ config ARMV7M_TOOLCHAIN_GNU_EABIW
 	bool "Generic GNU EABI toolchain under Windows"
 	depends on TOOLCHAIN_WINDOWS
 	select ARCH_TOOLCHAIN_GNU
+
+config ARMV7M_TOOLCHAIN_CLANGL
+	bool "Generic Clang toolchain under Linux (or other POSIX environment)"
+	depends on !WINDOWS_NATIVE
+	select ARCH_TOOLCHAIN_GNU
+
+config ARMV7M_TOOLCHAIN_CLANGW
+	bool "Generic Clang toolchain under Windows"
+	depends on TOOLCHAIN_WINDOWS
+	select ARCH_TOOLCHAIN_GNU
 	---help---
 		This option should work for any modern GNU toolchain (GCC 4.5 or newer)
 		configured for arm-none-eabi.

arch/arm/src/armv7-m/Toolchain.defs

@@ -102,6 +102,18 @@ ifeq ($(filter y, \
   CONFIG_ARMV7M_TOOLCHAIN ?= GNU_EABIW
 endif
 
+ifeq ($(filter y, \
+      $(CONFIG_ARMV7M_TOOLCHAIN_CLANGL) \
+    ),y)
+  CONFIG_ARMV7M_TOOLCHAIN ?= CLANGL
+endif
+
+ifeq ($(filter y, \
+      $(CONFIG_ARMV7M_TOOLCHAIN_CLANGW) \
+    ),y)
+  CONFIG_ARMV7M_TOOLCHAIN ?= CLANGW
+endif
+
 #
 # Supported toolchains
 #
@@ -255,6 +267,27 @@ ifeq ($(CONFIG_ARMV7M_TOOLCHAIN),GNU_EABIW)
   endif
 endif
 
+# Clang toolchain on OS X, Linux or any typical Posix system
+
+ifeq ($(CONFIG_ARMV7M_TOOLCHAIN),CLANGL)
+  CROSSDEV ?= arm-none-eabi-
+  ARCROSSDEV ?= arm-none-eabi-
+  MAXOPTIMIZATION ?= -Os
+  ARCHCPUFLAGS = $(TOOLCHAIN_MCPU) -mthumb $(TOOLCHAIN_MFLOAT)
+endif
+
+# Clang toolchain under Windows
+
+ifeq ($(CONFIG_ARMV7M_TOOLCHAIN),CLANGW)
+  CROSSDEV ?= arm-none-eabi-
+  ARCROSSDEV ?= arm-none-eabi-
+  MAXOPTIMIZATION ?= -Os
+  ARCHCPUFLAGS = $(TOOLCHAIN_MCPU) -mthumb $(TOOLCHAIN_MFLOAT)
+  ifeq ($(CONFIG_WINDOWS_CYGWIN),y)
+    WINTOOL = y
+  endif
+endif
+
 # Raisonance RIDE7 under Windows
 
 ifeq ($(CONFIG_ARMV7M_TOOLCHAIN),RAISONANCE)

configs/nucleo-f4x1re/f401-nsh-clang/Make.defs

@@ -0,0 +1,117 @@
+############################################################################
+# configs/nucleo-f4x1re/f401-nsh-clang/Make.defs
+#
+#   Copyright (C) 2017 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.
+#
+############################################################################
+
+include ${TOPDIR}/.config
+include ${TOPDIR}/tools/Config.mk
+include ${TOPDIR}/arch/arm/src/armv7-m/Toolchain.defs
+
+ifeq ($(CONFIG_ARCH_CHIP_STM32F401RE),y)
+LDSCRIPT = f401re.ld
+else
+ifeq ($(CONFIG_ARCH_CHIP_STM32F411RE),y)
+LDSCRIPT = f411re.ld
+endif
+endif
+
+ifeq ($(WINTOOL),y)
+  # Windows-native toolchains
+  DIRLINK = $(TOPDIR)/tools/copydir.sh
+  DIRUNLINK = $(TOPDIR)/tools/unlink.sh
+  MKDEP = $(TOPDIR)/tools/mkwindeps.sh
+  ARCHINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}"
+  ARCHXXINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}" -isystem "${shell cygpath -w $(TOPDIR)/include/cxx}"
+  ARCHSCRIPT = -T "${shell cygpath -w $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/$(LDSCRIPT)}"
+else
+  # Linux/Cygwin-native toolchain
+  MKDEP = $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
+  ARCHINCLUDES = -I. -isystem $(TOPDIR)/include
+  ARCHXXINCLUDES = -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
+  ARCHSCRIPT = -T$(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/$(LDSCRIPT)
+endif
+
+CC = clang
+CXX = clang++
+CPP = clang -E
+LD = $(CROSSDEV)ld
+AR = $(ARCROSSDEV)ar rcs
+NM = $(ARCROSSDEV)nm
+OBJCOPY = $(CROSSDEV)objcopy
+OBJDUMP = $(CROSSDEV)objdump
+
+ARCHCCVERSION = {shell $(CC) -v 2>&1 | sed -n '/clang version/p' | sed -e 's/.* clang version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g'}
+ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1}
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  ARCHOPTIMIZATION = -g
+endif
+
+ifneq ($(CONFIG_DEBUG_NOOPT),y)
+  ARCHOPTIMIZATION += $(MAXOPTIMIZATION) -fno-strict-aliasing -fomit-frame-pointer
+endif
+
+ARCHCFLAGS = -fno-builtin -nostdlib -ffreestanding -target arm-none-eabi -march=armv7-m -mcpu=cortex-m4
+ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fcheck-new -nostdlib -ffreestanding -target arm-none-eabi -march=armv7-m -mcpu=cortex-m4 -DCONFIG_WCHAR_BUILTIN
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
+ARCHWARNINGSXX = -Wall -Wshadow -Wundef
+ARCHDEFINES =
+ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
+
+CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
+CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
+CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+AFLAGS = $(CFLAGS) -D__ASSEMBLY__
+
+NXFLATLDFLAGS1 = -r -d -warn-common
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
+LDNXFLATFLAGS = -e main -s 2048
+
+ASMEXT = .S
+OBJEXT = .o
+LIBEXT = .a
+EXEEXT =
+
+ifneq ($(CROSSDEV),arm-nuttx-elf-)
+  LDFLAGS += -nostartfiles -nodefaultlibs
+endif
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDFLAGS += -g
+endif
+
+HOSTCC = clang
+HOSTINCLUDES = -I.
+HOSTCFLAGS = -Wall -Wstrict-prototypes -Wshadow -Wundef -g -pipe
+HOSTLDFLAGS =

include/nuttx/compiler.h

@@ -250,7 +250,9 @@
 
 /* GCC supports both types double and long long */
 
+#ifndef __clang__
 # define CONFIG_HAVE_LONG_LONG 1
+#endif
 # define CONFIG_HAVE_FLOAT 1
 # define CONFIG_HAVE_DOUBLE 1
 # define CONFIG_HAVE_LONG_DOUBLE 1