[PATCH v2 5/6] sdk: Inject sysroot path when calling relocated toolchain

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

This removes the need to specify --sysroot=/path/to/sdkroot when calling
gcc or ld from the SDK.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 meta/classes/image-sdk-extension.bbclass                 |  8 ++++++++
 .../sdkchroot/files/gcc-sysroot-wrapper.sh               | 16 ++++++++++++++++
 meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh    |  3 +++
 meta/recipes-devtools/sdkchroot/sdkchroot.bb             |  2 ++
 4 files changed, 29 insertions(+)
 create mode 100755 meta/recipes-devtools/sdkchroot/files/gcc-sysroot-wrapper.sh

diff --git a/meta/classes/image-sdk-extension.bbclass b/meta/classes/image-sdk-extension.bbclass
index 6e76b04d..aed8408c 100644
--- a/meta/classes/image-sdk-extension.bbclass
+++ b/meta/classes/image-sdk-extension.bbclass
@@ -32,6 +32,14 @@ do_populate_sdk() {
         fi
     done
 
+    # Set up sysroot wrapper
+    for tool_pattern in "gcc-[0-9]*" "g++-[0-9]*" "cpp-[0-9]*" "ld.bfd" "ld.gold"; do
+        for tool in $(find ${SDKCHROOT_DIR}/usr/bin -type f -name "*-linux-gnu-${tool_pattern}"); do
+            sudo mv "${tool}" "${tool}.bin"
+            sudo ln -sf gcc-sysroot-wrapper.sh ${tool}
+        done
+    done
+
     # Copy mount_chroot.sh for convenience
     sudo cp ${ISARROOT}/scripts/mount_chroot.sh ${SDKCHROOT_DIR}
 
diff --git a/meta/recipes-devtools/sdkchroot/files/gcc-sysroot-wrapper.sh b/meta/recipes-devtools/sdkchroot/files/gcc-sysroot-wrapper.sh
new file mode 100755
index 00000000..feead1a1
--- /dev/null
+++ b/meta/recipes-devtools/sdkchroot/files/gcc-sysroot-wrapper.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+#
+# This software is a part of ISAR.
+# Copyright (c) Siemens AG, 2020
+#
+# SPDX-License-Identifier: MIT
+
+GCC_SYSROOT=
+
+NEXT_TARGET=$0
+until [ "${NEXT_TARGET##*/}" = "gcc-sysroot-wrapper.sh" ]; do
+	TARGET=${NEXT_TARGET}
+	NEXT_TARGET=$(dirname ${TARGET})/$(readlink ${TARGET})
+done
+
+${TARGET}.bin --sysroot=${GCC_SYSROOT} "$@"
diff --git a/meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh b/meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh
index 1c9b02fa..0d1c6330 100755
--- a/meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh
+++ b/meta/recipes-devtools/sdkchroot/files/relocate-sdk.sh
@@ -38,4 +38,7 @@ for binary in $(find ${sdkroot}/usr/bin ${sdkroot}/usr/sbin ${sdkroot}/usr/lib/g
 	fi
 done
 
+sed -i 's|^GCC_SYSROOT=.*|GCC_SYSROOT="'"${new_sdkroot}"'"|' \
+    ${sdkroot}/usr/bin/gcc-sysroot-wrapper.sh
+
 echo "done"
diff --git a/meta/recipes-devtools/sdkchroot/sdkchroot.bb b/meta/recipes-devtools/sdkchroot/sdkchroot.bb
index dc765046..bf3f6fb4 100644
--- a/meta/recipes-devtools/sdkchroot/sdkchroot.bb
+++ b/meta/recipes-devtools/sdkchroot/sdkchroot.bb
@@ -11,6 +11,7 @@ LIC_FILES_CHKSUM = "file://${LAYERDIR_core}/licenses/COPYING.GPLv2;md5=751419260
 SRC_URI = " \
     file://configscript.sh \
     file://relocate-sdk.sh \
+    file://gcc-sysroot-wrapper.sh \
     file://README.sdk"
 PV = "0.1"
 
@@ -54,6 +55,7 @@ sdkchroot_install_files() {
     # Configure root filesystem
     sudo install -m 644 ${WORKDIR}/README.sdk ${S}
     sudo install -m 755 ${WORKDIR}/relocate-sdk.sh ${S}
+    sudo install -m 755 ${WORKDIR}/gcc-sysroot-wrapper.sh ${S}/usr/bin
     sudo install -m 755 ${WORKDIR}/configscript.sh ${S}
     sudo chroot ${S} /configscript.sh  ${DISTRO_ARCH}
 }
-- 
2.16.4