OS detection through Cmake

CMakeLists.txt

@@ -16,5 +16,13 @@ file(GLOB SRC2020 src/2020/*.c)
 file(COPY input DESTINATION ${CMAKE_BINARY_DIR})
 
 add_executable(advent ${SRC} ${SRC2015} ${SRC2016} ${SRC2017} ${SRC2018} ${SRC2019} ${SRC2020})
-target_link_libraries(advent PRIVATE bsd flint)
+
+if ((${CMAKE_SYSTEM_NAME} STREQUAL "OpenBSD") OR (${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD"))
+	message(WARNING "${CMAKE_SYSTEM_NAME}: Not linking libbsd")
+	target_link_libraries(advent PRIVATE flint)
+else()
+	message(WARNING "${CMAKE_SYSTEM_NAME}: Linking libbsd")
+	target_link_libraries(advent PRIVATE bsd flint)
+endif()
+
 target_include_directories(advent PRIVATE include lib/libflint/include)

README.md

@@ -6,7 +6,7 @@ Advent Of Code solutions using C99.
 
 Be sure to clone the project with its submodules:
 
-    git clone --recurse-submodules -j8 https://git.fputs.com/fputs/advent
+    git clone --recurse-submodules https://git.fputs.com/fputs/advent
 
 This project relies on several BSD extensions to the stdlib. BSDs should be able to build the project out of the box. Linux users will need `libbsd` installed. The package is called `libbsd-dev` on Debian-based systems.
 
@@ -17,6 +17,8 @@ Build the project using Cmake:
     cmake ..
     make
 
+The supplied `build.sh` script uses `scan-build` to build a compilation database. This is not neccesary for users.
+
 ## Inputs
 
 Inputs can be generated from `get_input.sh`. You will need to get your session cookie from the Advent of Code website. The easiest way to do this is to inspect any input page in your browser.

build.sh

@@ -0,0 +1,8 @@
+#! /usr/bin/env sh
+
+mkdir -p build
+cd build
+cmake ..
+make
+cp advent ..
+cd ..

src/input.c

@@ -3,7 +3,9 @@
 #include <string.h>
 #include <limits.h>
 
+#ifdef __linux__
 #include <bsd/stdlib.h>
+#endif
 
 #include "input.h"
 

src/main.c

@@ -1,7 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+
+#ifdef __linux__
 #include <bsd/stdlib.h>
+#endif
 
 #include "advent2015.h"
 #include "advent2016.h"