build system: improve install_headers.

Now it uses dedicated script instead of inline makefile commands,
which helps readability.
It also installs asm[-generic] and linux subdirs from kernel headers
(previously it had to be done separately).
Lastly, it passes each uclibc header thru unifdef, which strips
#ifdef UCLIBC_INTERNAL conditional from headers.
Currently it's a no-op (no such #ifders in tree).
The plan is to have libc_hidden_proto(foo) migrated to headers
and guard them by these #ifdefs.

1 files changed, 86 insertions, 0 deletions

diff --git a/extra/scripts/install_headers.sh b/extra/scripts/install_headers.sh
new file mode 100755
index 000000000..5f57695cb
--- /dev/null
+++ b/extra/scripts/install_headers.sh
@@ -0,0 +1,86 @@
+#!/bin/sh
+# Parameters:
+# $1 = source dir
+# $2 = dst dir
+# $top_builddir = well you guessed it
+
+die_if_not_dir()
+{
+	for dir in "$@"; do
+		test -d "$dir" && continue
+		echo "Error: '$dir' is not a directory"
+		exit 1
+	done
+}
+
+
+# Ensure that created dirs/files have 755/644 perms
+umask 022
+
+
+# Sanity tests
+die_if_not_dir "$1"
+mkdir -p "$2" 2>/dev/null
+die_if_not_dir "$2"
+die_if_not_dir "$top_builddir"
+if ! test -x "$top_builddir/extra/scripts/unifdef"; then
+	echo "Error: need '$top_builddir/extra/scripts/unifdef' executable"
+	exit 1
+fi
+
+
+# Sanitize and copy uclibc headers
+(
+# We must cd, or else we'll prepend "$1" to filenames!
+cd "$1" || exit 1
+find ! -name '.' -a ! -path '*/.*'
+) | \
+(
+IFS=''
+while read -r filename; do
+	filename="${filename#./}"
+	if test -d "$1/$filename"; then
+		mkdir -p "$2/$filename" 2>/dev/null
+	else
+		"$top_builddir/extra/scripts/unifdef" -UUCLIBC_INTERNAL "$1/$filename" >"$2/$filename" || exit
+	fi
+done
+)
+
+
+# Just copy (no sanitization) some kernel headers.
+eval `grep ^KERNEL_HEADERS "$top_builddir/.config"`
+if ! test -d "$KERNEL_HEADERS/asm" \
+|| ! test -d "$KERNEL_HEADERS/asm-generic" \
+|| ! test -d "$KERNEL_HEADERS/linux" \
+; then
+	echo "Error: '$KERNEL_HEADERS' is not a directory containing kernel headers."
+	echo "Check KERNEL_HEADERS= in your .config file."
+	exit 1
+fi
+# NB: source or target files and directories may be symlinks,
+# and for all we know, good reasons.
+# We must work correctly in these cases. This includes "do not replace
+# target symlink with real directory" rule. So, no rm -rf here please.
+mkdir -p "$2/asm"         2>/dev/null
+mkdir -p "$2/asm-generic" 2>/dev/null
+mkdir -p "$2/linux"       2>/dev/null
+# Exists, but is not a dir? That's bad, bail out
+die_if_not_dir "$2/asm" "$2/asm-generic" "$2/linux"
+# cp -HL creates regular destination files even if sources are symlinks.
+# This is intended.
+# (NB: you need busybox 1.11.x for this. earlier ones are slightly buggy)
+cp -RHL "$KERNEL_HEADERS/asm"/*         "$2/asm"         || exit 1
+cp -RHL "$KERNEL_HEADERS/asm-generic"/* "$2/asm-generic" || exit 1
+cp -RHL "$KERNEL_HEADERS/linux"/*       "$2/linux"       || exit 1
+if ! test -f "$2/linux/version.h"; then
+	echo "Warning: '$KERNEL_HEADERS/linux/version.h' is not found"
+	echo "in kernel headers directory specified in .config."
+	echo "Some programs won't like that. Consider fixing it by hand."
+fi
+
+
+# Fix mode/owner bits
+cd "$2" || exit 1
+chmod -R u=rwX,go=rX . >/dev/null 2>&1
+chown -R `id | sed 's/^uid=\([0-9]*\).*gid=\([0-9]*\).*$/\1:\2/'` . >/dev/null 2>&1