[PATCH v2] Makefile: install modules.builtin even if CONFIG_MODULES=n

[Jonas Zeiger <jonas.zeiger@talpidae.net>]

Many applications check for available kernel features via:

  - /proc/modules (loaded modules, present if CONFIG_MODULES=y)
  - $(MODLIB)/modules.builtin (builtin modules)

They fail to detect features if the kernel was built with 
CONFIG_MODULES=n
and modules.builtin isn't installed.

Therefore, add the target "_builtin_inst_" and make "install" and
"modules_install" depend on it.

Tests results:

  - make install: kernel image is copied as before, modules.builtin 
copied
  - make modules_install: (CONFIG_MODULES=n) nothing is copied, exit 1

Signed-off-by: Jonas Zeiger <jonas.zeiger@talpidae.net>
---
  Makefile | 14 +++++++++++---
  1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index a7bc91cbac8f..a160efd62897 100644
--- a/Makefile
+++ b/Makefile
@@ -1315,6 +1315,16 @@ dt_binding_check: scripts_dtc
  # 
---------------------------------------------------------------------------
  # Modules

+# install modules.builtin regardless of CONFIG_MODULES
+PHONY += _builtin_inst_
+_builtin_inst_:
+	@mkdir -p $(MODLIB)/
+	@cp -f modules.builtin $(MODLIB)/
+	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
+
+PHONY += install
+install: _builtin_inst_
+
  ifdef CONFIG_MODULES

  # By default, build modules as well
@@ -1344,7 +1354,7 @@ PHONY += modules_install
  modules_install: _modinst_ _modinst_post

  PHONY += _modinst_
-_modinst_:
+_modinst_: _builtin_inst_
  	@rm -rf $(MODLIB)/kernel
  	@rm -f $(MODLIB)/source
  	@mkdir -p $(MODLIB)/kernel
@@ -1354,8 +1364,6 @@ _modinst_:
  		ln -s $(CURDIR) $(MODLIB)/build ; \
  	fi
  	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
-	@cp -f modules.builtin $(MODLIB)/
-	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
  	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst

  # This depmod is only for convenience to give the initial
-- 
2.26.2