[UNIKRAFT/MUSL PATCH 2/3] scripts: Add header helper script

[Alexander Jung <a.jung@xxxxxxxxxxx>]

From: Alexander Jung <alexander.jung@xxxxxxxxx>

This helper script naively iterates through the source files of a
MUSL subcomponent and outputs the list of headers which it uses.

Signed-off-by: Alexander Jung <alexander.jung@xxxxxxxxx>
---
 scripts/list-headers.sh | 68 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100755 scripts/list-headers.sh

diff --git a/scripts/list-headers.sh b/scripts/list-headers.sh
new file mode 100755
index 0000000..fc40923
--- /dev/null
+++ b/scripts/list-headers.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+# Generate list of MUSL headers for a given library
+#
+# Authors: Alexander Jung <alexander.jung@xxxxxxxxx>
+#
+# Copyright (c) 2020, NEC Europe Ltd., NEC Corporation. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+MUSL_SRC=$1
+MUSL_LIB=$2
+
+if [ "x$MUSL_SRC" == "x" ]; then
+  echo "Usage: $0 [MUSL_SRC] [LIBRARY]"
+  exit 1
+elif [ ! -d $MUSL_SRC/src ]; then
+  echo "Could not find: $MUSL_SRC"
+  exit 1
+elif [ ! "x$MUSL_LIB" == "x" ] && [ ! -d $MUSL_SRC/src/$MUSL_LIB ]; then
+  echo "Could not find: $MUSL_SRC/src/$MUSL_LIB"
+  exit 1
+fi
+
+LIB_HDRS=()
+
+FILES=$(find $MUSL_SRC/src/$MUSL_LIB/ -type f -name '*.c')
+
+for FILE in $FILES; do
+  FILE_HDRS=$(grep -oP '#\s*include\s*[<"]\K[\w\/]+.h' $FILE)
+  LIB_HDRS+=($FILE_HDRS)
+done
+
+# Remove duplicates
+IFS=$'\n' LIB_HDRS=($(sort -u <<<"${LIB_HDRS[*]}"))
+unset IFS
+
+for HDR in "${LIB_HDRS[@]}"; do
+  if [ -f $MUSL_SRC/include/$HDR ]; then
+    echo "LIBMUSL_${MUSL_LIB^^}_HDRS-y += \$(LIBMUSL)/include/$HDR"
+  elif [ -f $MUSL_SRC/src/internal/$HDR ]; then
+    echo "LIBMUSL_${MUSL_LIB^^}_HDRS-y += \$(LIBMUSL)/src/internal/$HDR"
+  else
+    echo "# LIBMUSL_${MUSL_LIB^^}_HDRS-y += $HDR # not found"
+  fi
+done
-- 
2.20.1