From 2f155f6c0a1f5e9a306a3f1f4fbe067db7ced3b1 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Mon, 24 Sep 2007 09:05:31 -0600 Subject: [BUILD] Generate include/autoconf.mk from board config files Use cpp and sed to postprocess config.h and import the defined values into include/autoconf.mk. autoconf.mk is then included by config.mk to give 'make' access to the board configuration. Doing this enables conditional compilation at the Makefile level instead of by wrapping every .c file with #ifdef/#endif wrappers. Signed-off-by: Grant Likely --- Makefile | 18 +++++++++++++++++- config.mk | 3 +++ tools/scripts/define2mk.sed | 29 +++++++++++++++++++++++++++++ 3 files changed, 49 insertions(+), 1 deletion(-) create mode 100644 tools/scripts/define2mk.sed diff --git a/Makefile b/Makefile index ac4b430..407b938 100644 --- a/Makefile +++ b/Makefile @@ -342,6 +342,21 @@ $(obj)System.map: $(obj)u-boot grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \ sort > $(obj)System.map +# +# Auto-generate the autoconf.mk file (which is included by all makefiles) +# +# This target actually generates 2 files; autoconf.mk and autoconf.mk.dep. +# the dep file is only include in this top level makefile to determine when +# to regenerate the autoconf.mk file. +$(OBJTREE)/include/autoconf.mk: $(obj)include/config.h + @echo Generating include/autoconf.mk + @# Generate the dependancies + @$(CC) -M $(HOST_CFLAGS) $(CPPFLAGS) -MQ $@ include/common.h > $@.dep + @# Extract the config macros + @$(CPP) $(CFLAGS) -dM include/common.h | sed -n -f tools/scripts/define2mk.sed >> $@ + +sinclude $(OBJTREE)/include/autoconf.mk.dep + ######################################################################### else all $(obj)u-boot.hex $(obj)u-boot.srec $(obj)u-boot.bin \ @@ -361,7 +376,8 @@ CHANGELOG: unconfig: @rm -f $(obj)include/config.h $(obj)include/config.mk \ - $(obj)board/*/config.tmp $(obj)board/*/*/config.tmp + $(obj)board/*/config.tmp $(obj)board/*/*/config.tmp \ + $(obj)include/autoconf.mk $(obj)include/autoconf.mk.dep #======================================================================== # PowerPC diff --git a/config.mk b/config.mk index 37d61a0..79e5a31 100644 --- a/config.mk +++ b/config.mk @@ -87,6 +87,9 @@ ifdef BOARD sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules endif +# Load generated board configuration +sinclude $(OBJTREE)/include/autoconf.mk + ######################################################################### CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ diff --git a/tools/scripts/define2mk.sed b/tools/scripts/define2mk.sed new file mode 100644 index 0000000..6464627 --- /dev/null +++ b/tools/scripts/define2mk.sed @@ -0,0 +1,29 @@ +# +# Sed script to parse CPP macros and generate output usable by make +# +# It is expected that this script is fed the output of 'gpp -dM' +# which preprocesses the common.h header files and outputs the final +# list of CPP macros (and whitespace is sanitized) +# + +# Only process values prefixed with #define CONFIG_ +/^#define CONFIG_[A-Za-z0-9_]\+/ { + # Strip the #define prefix + s/#define *//; + # Change to form CONFIG_*=VALUE + s/ \+/=/; + # Drop trailing spaces + s/ *$//; + # drop quotes around string values + s/="\(.*\)"$/=\1/; + # Concatenate string values + s/" *"//g; + # Wrap non-numeral values with quotes + s/=\(.*\?[^0-9].*\)$/=\"\1\"/; + # Change '1' and empty values to "y" (not perfect, but + # supports conditional compilation in the makefiles + s/=$/=y/; + s/=1$/=y/; + # print the line + p +} -- cgit v1.1