add gen-boost-headers script

Change-Id: I02102f6c37863963efa9a312a5a0fbbc1f42f345

bin/gen-boost-headers

+#!/bin/bash
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+# generate a bunch of dummy headers that wrap the crappy boost headers and
+# suppress a myriad of warnings; requires GCC's #include_next extension
+
+set -euo pipefail
+IFS=$'\n\t'
+
+GENDIR=${SRCDIR}/external/boost/include
+
+rm -rf ${GENDIR}
+mkdir ${GENDIR}
+
+# note: clucene contains a copy of half of boost, so ignore it too
+
+cat <(cd ${SRCDIR} && git grep '^# *include') \
+    <(find ${WORKDIR}/UnpackedTarball/ -mindepth 1 -maxdepth 1 -type d \
+         | grep -v boost | grep -v clucene \
+         | xargs grep -r '^# *include') \
+ | grep -o '\bboost.*\.\(h\|hpp\|ipp\)' \
+ | sort | uniq \
+ | while read -r HEADER; do
+        mkdir -p "$(dirname ${GENDIR}/${HEADER})"
+        cat > "${GENDIR}/${HEADER}" << _EOF
+/* generated by $0, do not edit! */
+#pragma once
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunknown-pragmas"  /* first! for clang */
+#pragma GCC diagnostic ignored "-Wpragmas"  /* second! for GCC */
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#pragma GCC diagnostic ignored "-Wextra"
+#pragma GCC diagnostic ignored "-Wignored-qualifiers"
+#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#pragma GCC diagnostic ignored "-Winvalid-constexpr"
+#pragma GCC diagnostic ignored "-Wplacement-new"
+#pragma GCC diagnostic ignored "-Wreturn-type"
+#pragma GCC diagnostic ignored "-Wshadow"
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#pragma GCC diagnostic ignored "-Wtautological-constant-out-of-range-compare"
+#pragma GCC diagnostic ignored "-Wtype-limits"
+#pragma GCC diagnostic ignored "-Wundef"
+#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
+#pragma GCC diagnostic ignored "-Wunused-macros"
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#include_next <${HEADER}>
+#pragma GCC diagnostic pop
+_EOF
+    done
+