From 8954da8babbdc24a4a1accaaa123b4020dcfbd4f Mon Sep 17 00:00:00 2001
From: William Brawner <me@wbrawner.com>
Date: Wed, 1 Jan 2020 12:54:56 -0600
Subject: [PATCH] Add options to build PiHelper for different contexts

---
 CMakeLists.txt          |  6 ---
 PiHelper/CMakeLists.txt | 81 +++++++++++++++++++++++++++++++----------
 README.md               | 18 ++++++++-
 3 files changed, 78 insertions(+), 27 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7b5f0d9..61e8a97 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,8 +17,6 @@
 
 cmake_minimum_required (VERSION 3.15.5)
 
-include(GNUInstallDirs)
-
 set(PIHELPER_VERSION 0.1.0)
 
 project(
@@ -28,7 +26,3 @@ project(
 
 add_subdirectory(PiHelper)
 
-install(TARGETS pihelper libpihelper)
-
-install(FILES PiHelper/pihelper.h DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}/pihelper")
-
diff --git a/PiHelper/CMakeLists.txt b/PiHelper/CMakeLists.txt
index 43631de..fbdc060 100644
--- a/PiHelper/CMakeLists.txt
+++ b/PiHelper/CMakeLists.txt
@@ -15,6 +15,8 @@
 # You should have received a copy of the GNU General Public License
 # along with PiHelper.  If not, see <https://www.gnu.org/licenses/>.
 
+include(GNUInstallDirs)
+
 set(PIHELPER_SOURCES
     pihelper.c
     log.c
@@ -22,18 +24,12 @@ set(PIHELPER_SOURCES
     config.c
     )
 
-add_library(libpihelper
-    ${PIHELPER_SOURCES}
-    )
-
-set_target_properties(libpihelper PROPERTIES OUTPUT_NAME "libpihelper")
-
-add_executable(pihelper
-    ${PIHELPER_SOURCES}
-    cli.c
-    )
-
 include_directories(/usr/local/include)
+find_library (
+    CURL
+    NAMES curl libcurl
+    HINTS /usr/local/lib /usr/local/lib64 /usr/lib /usr/lib64
+    )
 find_library (
     JSONC
     NAMES json-c libjson-c
@@ -50,6 +46,10 @@ find_library (
     HINTS /usr/local/lib /usr/local/lib64 /usr/lib /usr/lib64
     )
 
+if (NOT CURL)
+    message(SEND_ERROR "Did not find curl")
+endif()
+
 if (NOT JSONC)
     message(SEND_ERROR "Did not find json-c")
 endif()
@@ -62,15 +62,58 @@ if (NOT OPENSSL)
     message(SEND_ERROR "Did not find OpenSSL")
 endif()
 
-target_link_libraries(libpihelper curl)
-target_link_libraries(pihelper curl)
+option(PIHELPER_STATIC "Build Pi-Helper as a static library" ON)
 
-target_link_libraries(libpihelper ${JSONC})
-target_link_libraries(pihelper ${JSONC})
+if (PIHELPER_STATIC)
+    add_library(libpihelperstatic STATIC
+        ${PIHELPER_SOURCES}
+        )
 
-target_link_libraries(libpihelper ${CRYPTO})
-target_link_libraries(pihelper ${CRYPTO})
+    set_target_properties(libpihelperstatic PROPERTIES OUTPUT_NAME "pihelper")
 
-target_link_libraries(libpihelper ${OPENSSL})
-target_link_libraries(pihelper ${OPENSSL})
+    target_link_libraries(libpihelperstatic ${CURL})
+    target_link_libraries(libpihelperstatic ${JSONC})
+    target_link_libraries(libpihelperstatic ${CRYPTO})
+    target_link_libraries(libpihelperstatic ${OPENSSL})
+
+    install(TARGETS libpihelperstatic )
+endif()
+
+option(PIHELPER_SHARED "Build Pi-Helper as a shared library" OFF)
+
+if (PIHELPER_SHARED)
+    add_library(libpihelpershared SHARED
+        ${PIHELPER_SOURCES}
+        )
+
+    set_target_properties(libpihelpershared PROPERTIES OUTPUT_NAME "pihelper")
+
+    target_link_libraries(libpihelpershared ${CURL})
+    target_link_libraries(libpihelpershared ${JSONC})
+    target_link_libraries(libpihelpershared ${CRYPTO})
+    target_link_libraries(libpihelpershared ${OPENSSL})
+
+    install(TARGETS libpihelpershared)
+endif()
+
+option(PIHELPER_DEV "Install Pi-Helper header files for development" OFF)
+if (PIHELPER_DEV)
+    install(FILES PiHelper/pihelper.h DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}/pihelper")
+endif()
+
+option(PIHELPER_EXECUTABLE "Build Pi-Helper as an executable" OFF)
+
+if (PIHELPER_EXECUTABLE)
+    add_executable(pihelper
+        ${PIHELPER_SOURCES}
+        cli.c
+        )
+
+    target_link_libraries(pihelper ${CURL})
+    target_link_libraries(pihelper ${JSONC})
+    target_link_libraries(pihelper ${CRYPTO})
+    target_link_libraries(pihelper ${OPENSSL})
+
+    install(TARGETS pihelper)
+endif()
 
diff --git a/README.md b/README.md
index b46a4e7..9709e3a 100644
--- a/README.md
+++ b/README.md
@@ -36,9 +36,23 @@ Once you have the dependencies installed, you can build the project with cmake:
     cmake ..
     make
 
-If you'd like to install pihelper to your system, run the following after building:
+By default, this will build a static library you can link to. If you'd like to build a shared library, use
+this cmake command instead:
 
-    sudo make install # This is optional, and only needed if you want to install command line utility
+    cmake -DPIHELPER_SHARED=BOOL:ON ..
+
+If you'd like to have the command line tool as well, you can use this:
+
+    cmake -DPIHELPER_EXECUTABLE=BOOL:ON ..
+
+If you need the development headers on your system, you can run this:
+
+    cmake -DPIHELPER_DEV=BOOL:ON ..
+
+Once you've run cmake with the desired options, you can install pihelper to your system by runnning the
+following after building:
+
+    sudo make install
 
 ## License