[Qemu-devel] [PATCH] build: remove use of MAKELEVEL optimization in submodule handling

["Daniel P. Berrange" <berrange@redhat.com>]

The Makefile attempts to optimize the handling of submodules by using MAKELEVEL
to only check the submodule status when running from the top level make
invokation. This causes problems for people who are using a makefile of their
own to in turn invoke QEMU's makefile, as MAKELEVEL is already set to 1 (or
more) when QEMU's makefile runs.

This optimization should not really be needed, since the git-submodule.sh
script is already used to detect if a submodule update is required. This by
removing the MAKELEVEL check, we at most add an extra 'git-submodule.sh status'
call to each make level, the overhead of which is lost in noise of building
QEMU.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---

NB this is on top of https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg00449.html

 Makefile | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index a92d7b8e14..0496c5057a 100644
--- a/Makefile
+++ b/Makefile
@@ -18,12 +18,11 @@ git-submodule-update:
 
 .PHONY: git-submodule-update
 
-ifeq (0,$(MAKELEVEL))
-  git_module_status := $(shell \
-    cd '$(SRC_PATH)' && \
-    GIT="$(GIT)" ./scripts/git-submodule.sh status $(GIT_SUBMODULES); \
-    echo $$?; \
-  )
+git_module_status := $(shell \
+  cd '$(SRC_PATH)' && \
+  GIT="$(GIT)" ./scripts/git-submodule.sh status $(GIT_SUBMODULES); \
+  echo $$?; \
+)
 
 ifeq (1,$(git_module_status))
 ifeq (no,$(GIT_UPDATE))
@@ -42,7 +41,6 @@ git-submodule-update:
           "GIT","$(GIT_SUBMODULES)")
 endif
 endif
-endif
 
 .git-submodule-status: git-submodule-update config-host.mak
 
-- 
2.13.6