1 files changed, 118 insertions, 0 deletions
diff --git a/build-aux/gen-single-binary.sh b/build-aux/gen-single-binary.sh
new file mode 100755
index 0000000..6570615
--- /dev/null
+++ b/build-aux/gen-single-binary.sh
@@ -0,0 +1,118 @@
+#!/bin/sh
+
+# Generate the list of rules for the single-binary option based on all the other
+# binaries found in src/local.mk.
+#
+# We need to duplicate the specific rules to build each program into a new
+# static library target. We can't reuse the existing target since we need to
+# create a .a file instead of linking the program. We can't do this at
+# ./configure since the file names need to be available when automake runs
+# to let it generate all the required rules in Makefile.in.  The configure
+# step will select which ones will be used to build, but they need to be
+# generated beforehand.
+#
+# Instead of maintaining a duplicated list of rules, we generate the
+# single-binary required rules based on the normal configuration found on
+# src/local.mk with this script.
+
+if test "x$1" = "x"; then
+  echo "Usage: $0 path/to/src/local.mk" >&2
+  exit 1
+fi
+
+set -e
+
+LOCAL_MK=$1
+GEN_LISTS_OF_PROGRAMS="`dirname "$0"`/gen-lists-of-programs.sh"
+
+ALL_PROGRAMS=$($GEN_LISTS_OF_PROGRAMS --list-progs \
+    | grep -v -F -e coreutils -e libstdbuf.so \
+    | tr '[' '_')
+
+# Compute default SOURCES. automake will assume the source file for the
+# src_${cmd} target to be src/${cmd}.c, but we will add rules to generate
+# the lib src_libsinglebin_${cmd}_a which won't match the autogenerated source
+# file. This loop will initialize the default source file and will be reset
+# later if needed.
+for cmd in $ALL_PROGRAMS; do
+  eval "src_${cmd}_SOURCES=src/${cmd}.c"
+done
+
+# Load actual values from src/local.mk. This will read all the variables from
+# the local.mk matching the src_${cmd}_... case.
+while read l; do
+  if echo "$l" | grep -E '^src_\w+ +\+?=' > /dev/null; then
+    var=$(echo $l | cut -f 1 -d ' ')
+    value=$(echo $l | cut -f 2- -d =)
+    if [ "$value" != " \$(LDADD)" ]; then
+      oldvalue=""
+      if echo $l | grep -F '+=' >/dev/null; then
+        eval "oldvalue=\${$var}"
+      fi
+      value=$(echo "$value" | sed "s/'/'\"'\"'/g")
+      eval "$var='$oldvalue "$value"'"
+    fi
+  fi
+done < $LOCAL_MK
+
+me=`echo "$0" | sed 's,.*/,,'`
+echo "## Automatically generated by $me.  DO NOT EDIT BY HAND!"
+
+# Override the sources for some tools, to use smaller variants
+override_single() {
+  from="$1"; to="$2";
+
+  eval "src_${from}_SOURCES='src/coreutils-${from}.c'"
+  eval "src_from_LDADD=\$src_${from}_LDADD"
+  eval "src_${from}_LDADD='$src_from_LDADD src/libsinglebin_${to}.a'"
+  eval "src_libsinglebin_${from}_a_DEPENDENCIES='src/libsinglebin_${to}.a'"
+  echo "src_libsinglebin_${from}_a_DEPENDENCIES = src/libsinglebin_${to}.a"
+}
+override_single dir ls
+override_single vdir ls
+override_single arch uname
+
+for cmd in $ALL_PROGRAMS; do
+  echo "# Command $cmd"
+  echo noinst_LIBRARIES += src/libsinglebin_${cmd}.a
+  base="src_libsinglebin_${cmd}_a"
+  # SOURCES
+  var=src_${cmd}_SOURCES
+  eval "value=\$$var"
+  echo "${base}_SOURCES = $value"
+
+  # LDADD
+  var=src_${cmd}_LDADD
+  eval "value=\$$var"
+  if [ "x$value" != "x" ]; then
+    echo "${base}_ldadd = $value"
+  fi
+
+  # DEPENDENCIES
+  var=src_libsinglebin_${cmd}_a_DEPENDENCIES
+  eval "value=\$$var"
+  if [ "x$value" = "x" ]; then
+    echo "$var = \$(src_${cmd}_DEPENDENCIES)"
+  fi
+
+  # CFLAGS
+  # Hack any other program defining a main() replacing its main by
+  # single_binary_main_$PROGRAM_NAME.
+  echo "${base}_CFLAGS = \"-Dmain=single_binary_main_${cmd} (int, char **);" \
+       " int single_binary_main_${cmd}\" " \
+       "-Dusage=_usage_${cmd} \$(src_coreutils_CFLAGS)"
+  var=src_${cmd}_CFLAGS
+  eval "value=\$$var"
+  if [ "x$value" != "x" ]; then
+    echo "${base}_CFLAGS += $value"
+  fi
+
+  # CPPFLAGS
+  var=src_${cmd}_CPPFLAGS
+  eval "value=\$$var"
+  if [ "x$value" != "x" ]; then
+    echo "${base}_CPPFLAGS = $value"
+  fi
+done
+
+exit 0