build: allow automatic git submodule updates to be disabled
Some people building QEMU use VPATH builds where the source directory is on a
read-only volume. In such a case 'scripts/git-submodules.sh update' will always
fail and users are required to run it manually themselves on their original
writable source directory.
While this is already supported, it is nice to give users a command line flag
to configure to permanently disable automatic submodule updates, as it means
they won't get hard to diagnose failures from git-submodules.sh at an arbitrary
later date.
This patch thus introduces a flag '--disable-git-update' which will prevent
'make' from ever running 'scripts/git-submodules.sh update'. It will still run
the 'status' command to determine if a submodule update is needed, but when it
does this it'll simply stop and print a message instructing the developer what
todo. eg
$ ./configure --target-list=x86_64-softmmu --disable-git-update
...snip...
$ make
GEN config-host.h
GEN trace/generated-tcg-tracers.h
GEN trace/generated-helpers-wrappers.h
GEN trace/generated-helpers.h
GEN trace/generated-helpers.c
GEN module_block.h
GIT submodule checkout is out of date. Please run
scripts/git-submodule.sh update ui/keycodemapdb
from the source directory checkout /home/berrange/src/virt/qemu
make: *** [Makefile:31: git-submodule-update] Error 1
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
diff --git a/configure b/configure
index 5af463f..a6055c0 100755
--- a/configure
+++ b/configure
@@ -267,8 +267,10 @@
if test -e "$source_path/.git"
then
+ git_update=yes
git_submodules="ui/keycodemapdb"
else
+ git_update=no
git_submodules=""
fi
git="git"
@@ -1306,6 +1308,10 @@
;;
--with-git=*) git="$optarg"
;;
+ --enable-git-update) git_update=yes
+ ;;
+ --disable-git-update) git_update=no
+ ;;
*)
echo "ERROR: unknown option $opt"
echo "Try '$0 --help' for more information"
@@ -5610,6 +5616,7 @@
echo "libs_softmmu=$libs_softmmu" >> $config_host_mak
echo "GIT=$git" >> $config_host_mak
echo "GIT_SUBMODULES=$git_submodules" >> $config_host_mak
+echo "GIT_UPDATE=$git_update" >> $config_host_mak
echo "ARCH=$ARCH" >> $config_host_mak
