[Buildroot] [PATCH 1/1] package/drogon: fix build with examples

Some examples embed CSP views, whose C++ sources are generated at build
time by drogon_ctl. When cross-compiling, CMake looks the tool up in
PATH, so the build fails with:

  [ 77%] Generating HelloView.h, HelloView.cc
  /bin/sh: 1: drogon_ctl: not found
  make[3]: *** [examples/CMakeFiles/helloworld.dir/build.make:74: examples/HelloView.h] Error 127

Add host-drogon to the dependencies, as it installs drogon_ctl in
$(HOST_DIR)/bin.

Fixes:
- https://autobuild.buildroot.org/results/b8f38b0645932cb5506515d6d313b64d824c8ce0

Signed-off-by: Dario Binacchi <[email protected]>
---
 package/drogon/drogon.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/package/drogon/drogon.mk b/package/drogon/drogon.mk
index 89b1b2720c7d..73388ea92c34 100644
--- a/package/drogon/drogon.mk
+++ b/package/drogon/drogon.mk
@@ -41,6 +41,11 @@ DROGON_CONF_OPTS += -DBUILD_CTL=OFF
 endif
 
 ifeq ($(BR2_PACKAGE_DROGON_EXAMPLES),y)
+# Some examples embed CSP views, whose C++ sources are generated at
+# build time by drogon_ctl. When cross-compiling, CMake does not
+# substitute the drogon_ctl target executable in the custom command, so
+# the tool is looked up in PATH and must be provided by host-drogon.
+DROGON_DEPENDENCIES += host-drogon
 DROGON_CONF_OPTS += -DBUILD_EXAMPLES=ON
 else
 DROGON_CONF_OPTS += -DBUILD_EXAMPLES=OFF
-- 
2.43.0

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