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Makefile
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun May 20 13:48:26 2007 +0000 (2007-05-20)
changeset 112 ea15433daba0
parent 96 aa1a9fbd6eb8
child 121 82e69d88119b
permissions -rw-r--r--
Ah! I finally have a progress bar that doesn't stall the build!
- pipe size in Linux is only 8*512=4096 bytes
- pipe size is not setable
- when the feeding process spits out data faster than the eating
process can read it, then the feeding process stalls after 4KiB
of data sent to the pipe
- for us, the progress bar would spawn a sub-shell every line,
and the sub-shell would in turn spawn a 'date' command.
Which was sloooww as hell, and would cause some kind of a
starvation: the pipe was full most of the time, and the
feeding process was stalled all this time.

Now, we use internal variables and a little hack based onan offset
to determine the elapsed time. Much faster this way, but still
CPU-intensive. 
     1 # Makefile for crosstool-NG.

     2 # Copyright 2006 Yann E. MORIN <yann.morin.1998@anciens.enib.fr>

     3 

     4 # Don't print directory as we descend into them

     5 MAKEFLAGS += --no-print-directory

     6 

     7 export CT_TOP_DIR=$(shell pwd)

     8 

     9 # This is crosstool-ng version string

    10 export CT_VERSION=$(shell cat $(CT_TOP_DIR)/version)

    11 

    12 .PHONY: all

    13 all: build

    14 

    15 HOST_CC = gcc -funsigned-char

    16 

    17 help::

    18 	@echo  'Available make targets:'

    19 	@echo

    20 

    21 include $(CT_TOP_DIR)/kconfig/Makefile

    22 include $(CT_TOP_DIR)/samples/Makefile

    23 

    24 help::

    25 	@echo  'Build targets:'

    26 	@echo  '* build          - Build the toolchain'

    27 	@echo  '  tarball        - Build a tarball of the configured toolchain'

    28 	@echo  '  clean          - Remove generated files'

    29 	@echo  '  distclean      - Remove generated files, configuration and build directories'

    30 

    31 include $(CT_TOP_DIR)/tools/Makefile

    32 

    33 help::

    34 	@echo  'Execute "make" or "make all" to build all targets marked with [*]'

    35 

    36 .config: $(CONFIG_FILES) $(CT_TOP_DIR)/config/debug.in

    37 	@make oldconfig

    38 

    39 # Actual build

    40 build: .config

    41 	@$(CT_TOP_DIR)/scripts/crosstool.sh

    42 

    43 .PHONY: tarball

    44 tarball:

    45 	@$(CT_TOP_DIR)/scripts/tarball.sh

    46 

    47 .PHONY: distclean

    48 distclean:: clean

    49 	@rm -f .config* ..config.tmp

    50 	@rm -rf "$(CT_TOP_DIR)/targets"
crosstool-ng