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Teach build to compare toys/*/*.c against .config symbol names instead of stopping at first _ when assembling list of files to build, and convert - to _. This lets us have commands like switch_root or nbd-client.
author Rob Landley <>
date Sat, 25 Aug 2012 15:43:02 -0500
parents 2986aa63a021
children c60ac785784f
line wrap: on
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# Grab default values for $CFLAGS and such.

source ./configure

if [ -z ".config" ]
  echo "No .config (see "make help" for configuration options)."
  exit 1

echo "Extract configuration information from toys/*.c files..."

echo "Generate headers from toys/*/*.c..."

# Create a list of all the applets toybox can provide.  Note that the first
# entry is out of order on purpose (the toybox multiplexer applet must be the
# first element of the array).  The rest must be sorted in alphabetical order
# for fast binary search.

echo "generated/newtoys.h"

function newtoys()
  for i in toys/*/*.c
    sed -n -e '1,/^config [A-Z]/s/^USE_/&/p' $i || exit 1
echo "NEWTOY(toybox, NULL, TOYFLAG_STAYROOT)" > generated/newtoys.h
newtoys | sed 's/\(.*TOY(\)\([^,]*\),\(.*\)/\2 \1\2,\3/' | sort -k 1,1 \
	| sed 's/[^ ]* //'  >> generated/newtoys.h

# Extract global structure definitions and flag definitions from toys/*/*.c

function getglobals()
  for i in toys/*/*.c
    NAME="$(echo $i | sed 's@.*/\(.*\)\.c@\1@')"

    echo -e "// $i\n"
    sed -n -e '/^DEFINE_GLOBALS(/,/^)/b got;b;:got' \
        -e 's/^DEFINE_GLOBALS(/struct '"$NAME"'_data {/' \
        -e 's/^)/};/' -e 'p' $i

    # And get flag definitions
    FLAGS="$(sed -n \
                 -e "s/.*TOY($NAME"',[ \t]*"\([^"]*\)"[ \t]*,.*)/\1/' \
                 -e 't keep;d;:keep' \
                 -e 's/[><=][0-9][0-9]*//g' \
                 -e 's/+.//g' \
                 -e 's/([^)]*)//g' \
                 -e 's/[-?^:&#|@*]//g' \
                 -e 'p' \
    while [ $X -lt ${#FLAGS} ]
      echo -ne "#define OPTFLAG_${NAME}_${FLAGS:$X:1}\t"
      echo "(1<<$((${#FLAGS}-$X)))"

echo "generated/globals.h"

  echo "$GLOBSTRUCT"
  echo "extern union global_union {"
  echo "$GLOBSTRUCT" | sed -n 's/struct \(.*\)_data {/	struct \1_data \1;/p'
  echo "} this;"
) > generated/globals.h

echo "generated/help.h"
# Only recreate generated/help.h if python is installed
if [ ! -z "$(which python)" ] && [ ! -z "$(grep 'CONFIG_HELP=y' .config)" ]
  echo "Extract help text from"
  scripts/ > generated/help.h || exit 1

echo "Make generated/config.h from .config."

# This long and roundabout sed invocation is to make old versions of sed happy.
# New ones have '\n' so can replace one line with two without all the branches
# and tedious mucking about with hold space.

sed -n \
  -e 's/^# CONFIG_\(.*\) is not set.*/\1/' \
  -e 't notset' \
  -e 's/^CONFIG_\(.*\)=y.*/\1/' \
  -e 't isset' \
  -e 's/^CONFIG_\([^=]*\)=\(.*\)/#define CFG_\1 \2/p' \
  -e 'd' \
  -e ':notset' \
  -e 'h' \
  -e 's/.*/#define CFG_& 0/p' \
  -e 'g' \
  -e 's/.*/#define USE_&(...)/p' \
  -e 'd' \
  -e ':isset' \
  -e 'h' \
  -e 's/.*/#define CFG_& 1/p' \
  -e 'g' \
  -e 's/.*/#define USE_&(...) __VA_ARGS__/p' \
  .config > generated/config.h || exit 1

# Extract a list of toys/*/*.c files to compile from the data in ".config":

# 1) Get a list of C files in toys/* and glue them together into a regex we can
# feed to grep that will match any one of them (whole word, not substring).
TOYFILES="^$(ls toys/*/*.c | sed -n 's@^.*/\(.*\)\.c$@\1@;s/-/_/g;H;${g;s/\n//;s/\n/$|^/gp}')\$"

# 2) Grab the XXX part of all CONFIG_XXX entries, removing everything after the
# second underline
# 3) Sort the list, keeping only one of each entry.
# 4) Convert to lower case.
# 5) Remove any config symbol not recognized as a filename from step 1.
# 6) Add "toys/*/" prefix and ".c" suffix.

TOYFILES=$(sed -nre 's/^CONFIG_(.*)=y/\1/;t skip;b;:skip;s/_.*//;p' < .config \
  | sort -u | tr A-Z a-z | grep -E "$TOYFILES" | sed 's@\(.*\)@toys/\*/\1.c@')

echo "Library probe..."

# We trust --as-needed to remove each library if we don't use any symbols
# out of it, this loop is because the compiler has no way to ignore a library
# that doesn't exist, so we have to detect and skip nonexistent libraries
# for it.

OPTLIBS="$(for i in util crypt m; do echo "int main(int argc, char *argv[]) {return 0;}" | ${CROSS_COMPILE}${CC} -xc - -o /dev/null -Wl,--as-needed -l$i > /dev/null 2>/dev/null && echo -l$i; done)"

echo "Compile toybox..."

  [ ! -z "$V" ] && echo "$@"

do_loudly ${CROSS_COMPILE}${CC} $CFLAGS -I . -o toybox_unstripped $OPTIMIZE \
  main.c lib/*.c $TOYFILES -Wl,--as-needed $OPTLIBS  || exit 1
do_loudly ${CROSS_COMPILE}${STRIP} toybox_unstripped -o toybox || exit 1
# gcc 4.4's strip command is buggy, and doesn't set the executable bit on
# its output the way SUSv4 suggests it do so.
do_loudly chmod +x toybox || exit 1