# When changing this, make sure:
# - to update debian/debhelper.in/libc.preinst!
# - that all builds for a given gnu triplet have the same minimum version (see bug#882255)
MIN_KERNEL_SUPPORTED := 3.2
libc = libc6

# Do not build pt_chown on this platform
pt_chown = no
# Expect pldd on this platform
pldd = yes

# NPTL Config
threads = yes

ifeq ($(filter stage1 stage2,$(DEB_BUILD_PROFILES)),)
  libc_extra_config_options = --with-selinux --enable-systemtap $(extra_config_options)
endif

ifndef LINUX_SOURCE
  ifeq ($(DEB_HOST_GNU_TYPE),$(DEB_BUILD_GNU_TYPE))
    LINUX_HEADERS := /usr/include
  else
    LINUX_HEADERS := /usr/$(DEB_HOST_GNU_TYPE)/include
  endif
else
  LINUX_HEADERS := $(LINUX_SOURCE)/include
endif

# Minimum Kernel supported
with_headers = --with-headers=$(shell pwd)/debian/include --enable-kernel=$(call xx,MIN_KERNEL_SUPPORTED)

KERNEL_HEADER_DIR = $(stamp)mkincludedir
$(stamp)mkincludedir:
	rm -rf debian/include
	mkdir debian/include

	# Kernel and library headers
	for h in arch asm asm-generic libaudit.h linux selinux sys/capability.h ; do \
	    mkdir -p debian/include/$$(dirname $$h) ; \
	    if [ -e "$(LINUX_HEADERS)/$$h" ]; then \
	        ln -s $(LINUX_HEADERS)/$$h debian/include/$$h ; \
	    elif [ -e "/usr/include/$(DEB_HOST_MULTIARCH)/$$h" ]; then \
	        ln -s /usr/include/$(DEB_HOST_MULTIARCH)/$$h debian/include/$$h ; \
	    elif [ -e "/usr/include/$$h" ]; then \
	        ln -s /usr/include/$$h debian/include/$$h ; \
	    fi ; \
	done

	ln -s /usr/include/$(DEB_HOST_MULTIARCH)/sys/sdt.h debian/include/sys/sdt.h
	ln -s /usr/include/$(DEB_HOST_MULTIARCH)/sys/sdt-config.h debian/include/sys/sdt-config.h

	# To make configure happy if libc6-dev is not installed.
	touch debian/include/assert.h

	touch $@

# Also to make configure happy.
export CPPFLAGS = -isystem $(shell pwd)/debian/include

# This round of ugliness decomposes the Linux kernel version number
# into an integer so it can be easily compared and then does so.
CURRENT_KERNEL_VERSION=$(shell uname -r)
define kernel_check
(minimum=$$((`echo $(1) | sed 's/^\([0-9]*\.[0-9]*\)\([^.0-9]\|$$\)/\1.0\2/; s/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 10000 + \2 \* 100 + \3/'`)); \
current=$$((`echo $(CURRENT_KERNEL_VERSION) | sed 's/^\([0-9]*\.[0-9]*\)\([^.0-9]\|$$\)/\1.0\2/; s/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 10000 + \2 \* 100 + \3/'`)); \
if [ $$current -lt $$minimum ]; then \
  false; \
fi)
endef