From 3f74512f8ec550e8d246ad4e28392807185fa705 Mon Sep 17 00:00:00 2001
From: Knut Tidemann <knut.tidemann@gmail.com>
Date: Fri, 12 Mar 2021 14:07:10 +0100
Subject: [PATCH] cmake: fix building with BUILD_LIBSYSTEMD and ninja generator
 (#138)

The ninja generator requires the BUILD_BYPRODUCTS specifier to work out the dependencies.
---
 cmake/LibsystemdExternalProject.cmake | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmake/LibsystemdExternalProject.cmake b/cmake/LibsystemdExternalProject.cmake
index dfa56d4..70bcf6e 100644
--- a/cmake/LibsystemdExternalProject.cmake
+++ b/cmake/LibsystemdExternalProject.cmake
@@ -45,7 +45,8 @@ ExternalProject_Add(LibsystemdBuildProject
                           COMMAND     ${NINJA} -C <BINARY_DIR> libsystemd.a
                     BUILD_ALWAYS      0
                     INSTALL_COMMAND   ${CMAKE_COMMAND} -E copy_directory <SOURCE_DIR>/src/systemd <INSTALL_DIR>/include/systemd
-                    LOG_DOWNLOAD 1 LOG_UPDATE 1 LOG_CONFIGURE 1 LOG_BUILD 1)
+                    LOG_DOWNLOAD 1 LOG_UPDATE 1 LOG_CONFIGURE 1 LOG_BUILD 1
+                    BUILD_BYPRODUCTS <BINARY_DIR>/libsystemd.a)
 
 ExternalProject_Get_property(LibsystemdBuildProject SOURCE_DIR)
 ExternalProject_Get_property(LibsystemdBuildProject BINARY_DIR)