Add toolchain wrapper for external toolchains
Add a simple toolchain wrapper for external toolchains, which forces the correct sysroot/march/mtune/floating point options needed to use it with buildroot. With this in place the external toolchain behaves similar to the internal ones, and the special handling can be removed. This also means that the toolchain is usable outside buildroot without having to pass any special compiler flags. Also adjust the downloadable external toolchain support to install under HOST_DIR so it can be used after the temporary build files are removed. Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Peter Korsgaard
parent
6721878972
commit
85dc57f6fd
4
Makefile
4
Makefile
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@ -284,7 +284,6 @@ STAMP_DIR:=$(BASE_DIR)/stamps
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BINARIES_DIR:=$(BASE_DIR)/images
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TARGET_DIR:=$(BASE_DIR)/target
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TOOLCHAIN_DIR=$(BASE_DIR)/toolchain
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TOOLCHAIN_EXTERNAL_DIR=$(BASE_DIR)/external-toolchain
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TARGET_SKELETON=$(TOPDIR)/fs/skeleton
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BR2_DEPENDS_DIR=$(BUILD_DIR)/buildroot-config
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@ -625,8 +624,7 @@ endif
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clean:
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rm -rf $(STAGING_DIR) $(TARGET_DIR) $(BINARIES_DIR) $(HOST_DIR) \
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$(STAMP_DIR) $(BUILD_DIR) $(TOOLCHAIN_DIR) $(BASE_DIR)/staging \
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$(TOOLCHAIN_EXTERNAL_DIR)
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$(STAMP_DIR) $(BUILD_DIR) $(TOOLCHAIN_DIR) $(BASE_DIR)/staging
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distclean: clean
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ifeq ($(DL_DIR),$(TOPDIR)/dl)
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@ -103,18 +103,8 @@ TARGET_SYSROOT_OPT=--sysroot=$(STAGING_DIR)
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ifeq ($(BR2_TOOLCHAIN_BUILDROOT)$(BR2_TOOLCHAIN_CTNG),y)
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TARGET_CROSS=$(HOST_DIR)/usr/bin/$(REAL_GNU_TARGET_NAME)-
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else ifeq ($(BR2_TOOLCHAIN_EXTERNAL),y)
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TOOLCHAIN_EXTERNAL_PREFIX=$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_PREFIX))
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ifeq ($(BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD),y)
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TOOLCHAIN_EXTERNAL_LOCATION=$(TOOLCHAIN_EXTERNAL_DIR)
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else
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TOOLCHAIN_EXTERNAL_LOCATION=$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_PATH))
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endif
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ifneq ($(TOOLCHAIN_EXTERNAL_LOCATION),)
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TARGET_CROSS=$(TOOLCHAIN_EXTERNAL_LOCATION)/bin/$(TOOLCHAIN_EXTERNAL_PREFIX)-
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else
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TARGET_CROSS=$(TOOLCHAIN_EXTERNAL_PREFIX)-
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endif
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TARGET_CROSS=$(HOST_DIR)/usr/bin/$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_PREFIX))-
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endif
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# Quotes are needed for spaces et al in path components.
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@ -41,8 +41,16 @@
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# packages when using external toolchains. So in the end, only the
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# cross-compiler binaries remains external, all libraries and headers
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# are imported into the Buildroot tree.
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#
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# 4. Build a toolchain wrapper which executes the external toolchain
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# with a number of arguments (sysroot/march/mtune/..) hardcoded,
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# so we're sure the correct configuration is always used and the
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# toolchain behaves similar to an internal toolchain.
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# This toolchain wrapper and symlinks are installed into
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# $(HOST_DIR)/usr/bin like for the internal toolchains, and the rest
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# of Buildroot is handled identical for the 2 toolchain types.
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uclibc: dependencies $(STAMP_DIR)/ext-toolchain-installed
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uclibc: dependencies $(HOST_DIR)/usr/bin/ext-toolchain-wrapper
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LIB_EXTERNAL_LIBS=ld*.so libc.so libcrypt.so libdl.so libgcc_s.so libm.so libnsl.so libresolv.so librt.so libutil.so
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ifeq ($(BR2_TOOLCHAIN_EXTERNAL_GLIBC),y)
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@ -97,7 +105,51 @@ endif # ! no threads
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# present in the main sysroot, and only the libraries are available in
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# each variant-specific sysroot directory.
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TARGET_CC_NO_SYSROOT=$(filter-out --sysroot=%,$(TARGET_CC_NOCCACHE))
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TOOLCHAIN_EXTERNAL_PREFIX=$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_PREFIX))
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ifeq ($(BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD),y)
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TOOLCHAIN_EXTERNAL_DIR=$(HOST_DIR)/opt/ext-toolchain
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else
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TOOLCHAIN_EXTERNAL_DIR=$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_PATH))
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endif
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ifeq ($(TOOLCHAIN_EXTERNAL_DIR),)
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# if no path set, figure it out from path
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TOOLCHAIN_EXTERNAL_BIN:=$(shell dirname $(shell which $(TOOLCHAIN_EXTERNAL_PREFIX)-gcc))
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else
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TOOLCHAIN_EXTERNAL_BIN:=$(TOOLCHAIN_EXTERNAL_DIR)/bin
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endif
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TOOLCHAIN_EXTERNAL_CROSS=$(TOOLCHAIN_EXTERNAL_BIN)/$(TOOLCHAIN_EXTERNAL_PREFIX)-
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TOOLCHAIN_EXTERNAL_CC=$(TOOLCHAIN_EXTERNAL_CROSS)gcc
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TOOLCHAIN_EXTERNAL_WRAPPER_ARGS = \
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-DBR_CROSS_PATH='"$(TOOLCHAIN_EXTERNAL_BIN)/"' \
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-DBR_SYSROOT='"$(STAGING_DIR)"'
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# march/mtune/floating point mode needs to be passed to the external toolchain
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# to select the right multilib variant
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ifneq ($(CC_TARGET_TUNE_),)
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TOOLCHAIN_EXTERNAL_CFLAGS += -mtune=$(CC_TARGET_TUNE_)
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TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_TUNE='"$(CC_TARGET_TUNE_)"'
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endif
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ifneq ($(CC_TARGET_ARCH_),)
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TOOLCHAIN_EXTERNAL_CFLAGS += -march=$(CC_TARGET_ARCH_)
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TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_ARCH='"$(CC_TARGET_ARCH_)"'
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endif
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ifneq ($(CC_TARGET_ABI_),)
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TOOLCHAIN_EXTERNAL_CFLAGS += -mabi=$(CC_TARGET_ABI_)
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TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_ABI='"$(CC_TARGET_ABI_)"'
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endif
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ifeq ($(BR2_SOFT_FLOAT),y)
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TOOLCHAIN_EXTERNAL_CFLAGS += -msoft-float
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TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_SOFTFLOAT=1
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endif
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ifeq ($(BR2_VFP_FLOAT),y)
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TOOLCHAIN_EXTERNAL_CFLAGS += -mfpu=vfp
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TOOLCHAIN_EXTERNAL_WRAPPER_ARGS += -DBR_VFPFLOAT=1
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endif
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ifeq ($(BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD),y)
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TOOLCHAIN_EXTERNAL_DEPENDENCIES = $(TOOLCHAIN_EXTERNAL_DIR)/.extracted
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@ -146,9 +198,9 @@ $(TOOLCHAIN_EXTERNAL_DIR)/.extracted: $(DL_DIR)/$(TOOLCHAIN_EXTERNAL_SOURCE)
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$(STAMP_DIR)/ext-toolchain-checked:
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@echo "Checking external toolchain settings"
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$(Q)$(call check_cross_compiler_exists)
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$(Q)SYSROOT_DIR=`$(TARGET_CC_NO_SYSROOT) -print-sysroot 2>/dev/null` ; \
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$(Q)SYSROOT_DIR=`$(TOOLCHAIN_EXTERNAL_CC) -print-sysroot 2>/dev/null` ; \
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if test -z "$${SYSROOT_DIR}" ; then \
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SYSROOT_DIR=`readlink -f $$(LANG=C $(TARGET_CC_NO_SYSROOT) -print-file-name=libc.a) |sed -r -e 's:usr/lib/libc\.a::;'` ; \
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SYSROOT_DIR=`readlink -f $$(LANG=C $(TOOLCHAIN_EXTERNAL_CC) -print-file-name=libc.a) |sed -r -e 's:usr/lib/libc\.a::;'` ; \
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fi ; \
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if test -z "$${SYSROOT_DIR}" ; then \
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@echo "External toolchain doesn't support --sysroot. Cannot use." ; \
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@ -172,15 +224,15 @@ $(STAMP_DIR)/ext-toolchain-checked:
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# the $(TARGET_DIR) and copy the whole sysroot (libraries and headers)
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# to $(STAGING_DIR).
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$(STAMP_DIR)/ext-toolchain-installed: $(TOOLCHAIN_EXTERNAL_DEPENDENCIES)
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$(Q)SYSROOT_DIR=`$(TARGET_CC_NO_SYSROOT) -print-sysroot 2>/dev/null` ; \
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$(Q)SYSROOT_DIR=`$(TOOLCHAIN_EXTERNAL_CC) -print-sysroot 2>/dev/null` ; \
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if test -z "$${SYSROOT_DIR}" ; then \
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SYSROOT_DIR=`readlink -f $$(LANG=C $(TARGET_CC_NO_SYSROOT) -print-file-name=libc.a) |sed -r -e 's:usr/lib/libc\.a::;'` ; \
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SYSROOT_DIR=`readlink -f $$(LANG=C $(TOOLCHAIN_EXTERNAL_CC) -print-file-name=libc.a) |sed -r -e 's:usr/lib/libc\.a::;'` ; \
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fi ; \
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if test -z "$${SYSROOT_DIR}" ; then \
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@echo "External toolchain doesn't support --sysroot. Cannot use." ; \
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exit 1 ; \
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fi ; \
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ARCH_SUBDIR=`$(TARGET_CC_NO_SYSROOT) $(TARGET_CFLAGS) -print-multi-directory` ; \
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ARCH_SUBDIR=`$(TOOLCHAIN_EXTERNAL_CC) $(TOOLCHAIN_EXTERNAL_CFLAGS) -print-multi-directory` ; \
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ARCH_SYSROOT_DIR=$${SYSROOT_DIR}/$${ARCH_SUBDIR} ; \
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mkdir -p $(TARGET_DIR)/lib ; \
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echo "Copy external toolchain libraries to target..." ; \
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@ -196,3 +248,21 @@ $(STAMP_DIR)/ext-toolchain-installed: $(TOOLCHAIN_EXTERNAL_DEPENDENCIES)
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$(call create_lib64_symlinks) ; \
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fi ; \
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touch $@
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# Build toolchain wrapper for preprocessor, C and C++ compiler, and setup
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# symlinks for everything else
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$(HOST_DIR)/usr/bin/ext-toolchain-wrapper: $(STAMP_DIR)/ext-toolchain-installed
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mkdir -p $(HOST_DIR)/usr/bin; cd $(HOST_DIR)/usr/bin; \
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for i in $(TOOLCHAIN_EXTERNAL_CROSS)*; do \
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case "$$i" in \
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*cc|*cc-*|*++|*++-*|*cpp) \
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base=$${i##*/}; \
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ln -sf $(@F) $$base; \
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;; \
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*) \
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ln -sf $$i .; \
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;; \
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esac; \
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done ;
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$(HOSTCC) $(HOST_CFLAGS) $(TOOLCHAIN_EXTERNAL_WRAPPER_ARGS) -s \
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toolchain/toolchain-external/ext-toolchain-wrapper.c -o $@
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75
toolchain/toolchain-external/ext-toolchain-wrapper.c
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75
toolchain/toolchain-external/ext-toolchain-wrapper.c
Normal file
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@ -0,0 +1,75 @@
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/**
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* Buildroot wrapper for external toolchains. This simply executes the real
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* toolchain with a number of arguments (sysroot/arch/..) hardcoded,
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* to ensure the external toolchain uses the correct configuration.
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*
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* (C) 2011 Peter Korsgaard <jacmet@sunsite.dk>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <unistd.h>
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#define MAXARGS 1000
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static char path[PATH_MAX] = BR_CROSS_PATH;
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static char *args[MAXARGS] = {
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path,
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"--sysroot", BR_SYSROOT,
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#ifdef BR_ARCH
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"-march=" BR_ARCH,
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#endif /* BR_ARCH */
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#ifdef BR_TUNE
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"-mtune=" BR_TUNE,
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#endif /* BR_TUNE */
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#ifdef BR_ABI
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"-mabi=" BR_ABI,
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#endif
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#ifdef BR_SOFTFLOAT
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"-msoft-float",
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#endif /* BR_SOFTFLOAT */
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#ifdef BR_VFPFLOAT
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"-mfpu=vfp",
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#endif /* BR_VFPFLOAT */
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};
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static const char *get_basename(const char *name)
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{
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const char *base;
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base = strrchr(name, '/');
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if (base)
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base++;
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else
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base = name;
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return base;
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}
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int main(int argc, char **argv)
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{
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int i;
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for (i=0; args[i]; i++);
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if ((argc+i) >= MAXARGS) {
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fputs("Too many arguments\n", stderr);
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return 1;
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}
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/* forward args */
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memcpy(&args[i], &argv[1], sizeof(argv[0]) * (argc - 1));
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strcat(path, get_basename(argv[0]));
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if (execv(path, args))
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perror(path);
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return 2;
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}
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