build-aux/gen-single-binary.sh

   1 #!/bin/sh
   2
   3 # Generate the list of rules for the single-binary option based on all the other
   4 # binaries found in src/local.mk.
   5 #
   6 # We need to duplicate the specific rules to build each program into a new
   7 # static library target. We can't reuse the existing target since we need to
   8 # create a .a file instead of linking the program. We can't do this at
   9 # ./configure since the file names need to be available when automake runs
  10 # to let it generate all the required rules in Makefile.in.  The configure
  11 # step will select which ones will be used to build, but they need to be
  12 # generated beforehand.
  13 #
  14 # Instead of maintaining a duplicated list of rules, we generate the
  15 # single-binary required rules based on the normal configuration found on
  16 # src/local.mk with this script.
  17
  18 if test "x$1" = "x"; then
  19   echo "Usage: $0 path/to/src/local.mk" >&2
  20   exit 1
  21 fi
  22
  23 set -e
  24
  25 LOCAL_MK=$1
  26 GEN_LISTS_OF_PROGRAMS="`dirname "$0"`/gen-lists-of-programs.sh"
  27
  28 ALL_PROGRAMS=$($GEN_LISTS_OF_PROGRAMS --list-progs \
  29     | grep -v -F -e coreutils -e libstdbuf.so \
  30     | tr '[' '_')
  31
  32 # Compute default SOURCES. automake will assume the source file for the
  33 # src_${cmd} target to be src/${cmd}.c, but we will add rules to generate
  34 # the lib src_libsinglebin_${cmd}_a which won't match the autogenerated source
  35 # file. This loop will initialize the default source file and will be reset
  36 # later if needed.
  37 for cmd in $ALL_PROGRAMS; do
  38   eval "src_${cmd}_SOURCES=src/${cmd}.c"
  39 done
  40
  41 # Load actual values from src/local.mk. This will read all the variables from
  42 # the local.mk matching the src_${cmd}_... case.
  43 while read l; do
  44   if echo "$l" | grep -E '^src_[_[:alnum:]]+ +\+?=' > /dev/null; then
  45     var=$(echo $l | cut -f 1 -d ' ')
  46     value=$(echo $l | cut -f 2- -d =)
  47     if [ "$value" != " \$(LDADD)" ]; then
  48       oldvalue=""
  49       if echo $l | grep -F '+=' >/dev/null; then
  50         eval "oldvalue=\${$var}"
  51       fi
  52       value=$(echo "$value" | sed "s/'/'\"'\"'/g")
  53       eval "$var='$oldvalue "$value"'"
  54     fi
  55   fi
  56 done < $LOCAL_MK
  57
  58 me=`echo "$0" | sed 's,.*/,,'`
  59 echo "## Automatically generated by $me.  DO NOT EDIT BY HAND!"
  60
  61 # Override the sources for some tools, to use smaller variants
  62 override_single() {
  63   from="$1"; to="$2";
  64
  65   eval "src_${from}_SOURCES='src/coreutils-${from}.c'"
  66   eval "src_from_LDADD=\$src_${from}_LDADD"
  67   eval "src_${from}_LDADD='$src_from_LDADD src/libsinglebin_${to}.a'"
  68   eval "src_libsinglebin_${from}_a_DEPENDENCIES='src/libsinglebin_${to}.a'"
  69   echo "src_libsinglebin_${from}_a_DEPENDENCIES = src/libsinglebin_${to}.a"
  70 }
  71 override_single dir ls
  72 override_single vdir ls
  73 override_single arch uname
  74
  75 for cmd in $ALL_PROGRAMS; do
  76   echo "# Command $cmd"
  77   echo noinst_LIBRARIES += src/libsinglebin_${cmd}.a
  78   base="src_libsinglebin_${cmd}_a"
  79   # SOURCES
  80   var=src_${cmd}_SOURCES
  81   eval "value=\$$var"
  82   echo "${base}_SOURCES = $value"
  83
  84   # LDADD
  85   var=src_${cmd}_LDADD
  86   eval "value=\$$var"
  87   if [ "x$value" != "x" ]; then
  88     echo "${base}_ldadd = $value"
  89   fi
  90
  91   # DEPENDENCIES
  92   var=src_libsinglebin_${cmd}_a_DEPENDENCIES
  93   eval "value=\$$var"
  94   if [ "x$value" = "x" ]; then
  95     echo "$var = \$(src_${cmd}_DEPENDENCIES)"
  96   fi
  97
  98   # CFLAGS
  99   # Hack any other program defining a main() replacing its main by
 100   # single_binary_main_$PROGRAM_NAME.
 101   echo "${base}_CFLAGS = \"-Dmain=single_binary_main_${cmd} (int, char **);" \
 102        " int single_binary_main_${cmd}\" " \
 103        "-Dusage=_usage_${cmd} \$(src_coreutils_CFLAGS)"
 104   var=src_${cmd}_CFLAGS
 105   eval "value=\$$var"
 106   if [ "x$value" != "x" ]; then
 107     echo "${base}_CFLAGS += $value"
 108   fi
 109
 110   # CPPFLAGS
 111   var=src_${cmd}_CPPFLAGS
 112   eval "value=\$$var"
 113   if [ "x$value" != "x" ]; then
 114     echo "${base}_CPPFLAGS = $value"
 115   fi
 116 done
 117
 118 exit 0