cde947f5f5
Currently we configure uClibc to use kernel headers from "staging" folder with KERNEL_HEADERS="$(STAGING_DIR)/usr/include". This path is added to include search path of uClibc build system in Rules.mak "CFLAGS += -I$(KERNEL_HEADERS)". At the same time on uClibc installation to "staging" we point to the same location "$(STAGING_DIR)/usr" (headers effectively go in "usr/include"). So after every installation to "staging" dependences get touched (even though we copy the same headers every time) and so we may see lots of sources in uClibc get rebuilt. This has 2 consequences: 1. Longer build time - becase even on ordinary buildroot build uClibc is built twice. On "uclibc building" and on "uclibc installation to target". 2. Symbols in libuClibc built initially (that is later installed in "staging/sysroot") are situated with different offset compared to second build (later copied in "target"). This happens because as described above only part of sources get rebuilt and then on final linkage object files are linked in different order. And (2) leads to problems on remote rebugging: gdbserver reports offsets that correspond to pointless assembly in libuClibc on host. Here's how it looks like. Before this patch: $ cd ~/br2_output/i586/target/lib $ i586-buildroot-linux-uclibc-readelf -s libuClibc-0.9.33.2.so | grep kill 423: 0000c42c 54 FUNC GLOBAL DEFAULT 7 kill $ cd ~/br2_output/i586/staging/lib $ i586-buildroot-linux-uclibc-readelf -s libuClibc-0.9.33.2.so | grep kill 423: 0000b518 54 FUNC GLOBAL DEFAULT 7 kill After this patch: $ cd ~/br2_output/i586/target/lib $ i586-buildroot-linux-uclibc-readelf -s libuClibc-0.9.33.2.so | grep kill 423: 0000b518 54 FUNC GLOBAL DEFAULT 7 kill $ cd ~/br2_output/i586/staging/lib $ i586-buildroot-linux-uclibc-readelf -s libuClibc-0.9.33.2.so | grep kill 423: 0000b518 54 FUNC GLOBAL DEFAULT 7 kill Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Peter Korsgaard <peter@korsgaard.com> Cc: Noam Camus <noamc@ezchip.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
64 lines
2.0 KiB
Makefile
64 lines
2.0 KiB
Makefile
################################################################################
|
|
#
|
|
# linux-headers
|
|
#
|
|
################################################################################
|
|
|
|
# This package is used to provide Linux kernel headers for the
|
|
# internal toolchain backend.
|
|
|
|
LINUX_HEADERS_VERSION = $(call qstrip,$(BR2_DEFAULT_KERNEL_HEADERS))
|
|
ifeq ($(findstring x2.6.,x$(LINUX_HEADERS_VERSION)),x2.6.)
|
|
LINUX_HEADERS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6/
|
|
else
|
|
LINUX_HEADERS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x/
|
|
endif
|
|
LINUX_HEADERS_SOURCE = linux-$(LINUX_HEADERS_VERSION).tar.xz
|
|
|
|
LINUX_HEADERS_INSTALL_STAGING = YES
|
|
|
|
# linux-headers is part of the toolchain so disable the toolchain dependency
|
|
LINUX_HEADERS_ADD_TOOLCHAIN_DEPENDENCY = NO
|
|
|
|
# For some architectures (eg. Arc, Cris, Hexagon, ia64, parisc,
|
|
# score and xtensa), the Linux buildsystem tries to call the
|
|
# cross-compiler, although it is not needed at all.
|
|
# This results in seemingly errors like:
|
|
# [...]/scripts/gcc-version.sh: line 26: arc-linux-uclibc-gcc: command not found
|
|
# Those can be safely ignored.
|
|
|
|
# This step is required to have a separate linux headers location for
|
|
# uClibc building. This way uClibc doesn't modify linux headers on installation
|
|
# of "its" headers
|
|
define LINUX_HEADERS_CONFIGURE_CMDS
|
|
(cd $(@D); \
|
|
$(TARGET_MAKE_ENV) $(MAKE) \
|
|
ARCH=$(KERNEL_ARCH) \
|
|
HOSTCC="$(HOSTCC)" \
|
|
HOSTCFLAGS="$(HOSTCFLAGS)" \
|
|
HOSTCXX="$(HOSTCXX)" \
|
|
headers_install)
|
|
endef
|
|
|
|
define LINUX_HEADERS_INSTALL_STAGING_CMDS
|
|
(cd $(@D); \
|
|
$(TARGET_MAKE_ENV) $(MAKE) \
|
|
ARCH=$(KERNEL_ARCH) \
|
|
HOSTCC="$(HOSTCC)" \
|
|
HOSTCFLAGS="$(HOSTCFLAGS)" \
|
|
HOSTCXX="$(HOSTCXX)" \
|
|
INSTALL_HDR_PATH=$(STAGING_DIR)/usr \
|
|
headers_install)
|
|
endef
|
|
|
|
ifeq ($(BR2_KERNEL_HEADERS_VERSION),y)
|
|
define LINUX_HEADERS_CHECK_VERSION
|
|
$(call check_kernel_headers_version,\
|
|
$(STAGING_DIR),\
|
|
$(call qstrip,$(BR2_TOOLCHAIN_HEADERS_AT_LEAST)))
|
|
endef
|
|
LINUX_HEADERS_POST_INSTALL_STAGING_HOOKS += LINUX_HEADERS_CHECK_VERSION
|
|
endif
|
|
|
|
$(eval $(generic-package))
|