linux-user: introduce parameters to generate syscall_nr.h

This will be used when we'll import syscall.tbl from the kernel

Add a script to remove all the dependencies to syscall_nr.h
that point to source directory and not to the build directory.
The list of arch will be update while the generated files are added.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <20200310103403.3284090-2-laurent@vivier.eu>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

Makefile.target

@@ -128,7 +128,8 @@ ifdef CONFIG_LINUX_USER
 
 QEMU_CFLAGS+=-I$(SRC_PATH)/linux-user/$(TARGET_ABI_DIR) \
              -I$(SRC_PATH)/linux-user/host/$(ARCH) \
-             -I$(SRC_PATH)/linux-user
+             -I$(SRC_PATH)/linux-user \
+             -Ilinux-user/$(TARGET_ABI_DIR)
 
 obj-y += linux-user/
 obj-y += gdbstub.o thunk.o

configure

@@ -1887,6 +1887,17 @@ fi
 # Remove old dependency files to make sure that they get properly regenerated
 rm -f */config-devices.mak.d
 
+# Remove syscall_nr.h to be sure they will be regenerated in the build
+# directory, not in the source directory
+for arch in ; do
+    # remove the file if it has been generated in the source directory
+    rm -f "${source_path}/linux-user/${arch}/syscall_nr.h"
+    # remove the dependency files
+    find . -name "*.d" \
+           -exec grep -q "${source_path}/linux-user/${arch}/syscall_nr.h" {} \; \
+           -exec rm {} \;
+done
+
 if test -z "$python"
 then
     error_exit "Python not found. Use --python=/path/to/python"
@@ -7931,6 +7942,9 @@ echo "TARGET_ABI_DIR=$TARGET_ABI_DIR" >> $config_target_mak
 if [ "$HOST_VARIANT_DIR" != "" ]; then
     echo "HOST_VARIANT_DIR=$HOST_VARIANT_DIR" >> $config_target_mak
 fi
+if [ "$TARGET_SYSTBL_ABI" != "" ]; then
+    echo "TARGET_SYSTBL_ABI=$TARGET_SYSTBL_ABI" >> $config_target_mak
+fi
 
 if supported_xen_target $target; then
     echo "CONFIG_XEN=y" >> $config_target_mak