CMake now works on Linux

It uses pkg-config to obtain hints about where the libraries are.

CMakeLists.txt

@@ -1,10 +1,11 @@
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
-cmake_minimum_required(VERSION 3.9.3)
+cmake_minimum_required(VERSION 3.7.2)
 project("Chocolate Doom" VERSION 3.0.0 LANGUAGES C)
 
 # AC_INIT variables
 set(PACKAGE_NAME "${PROJECT_NAME}")
+set(PACKAGE_TARNAME "chocolate-doom")
 set(PACKAGE_STRING "${PROJECT_NAME} ${PROJECT_VERSION}")
 
 string(REGEX REPLACE " Doom$" "" PACKAGE_SHORTNAME "${PACKAGE_NAME}")
@@ -13,6 +14,10 @@ find_package(SDL2 2.0.1)
 find_package(SDL2_mixer 2.0.0)
 find_package(SDL2_net 2.0.0)
 
+include(CheckFunctionExists)
+check_function_exists(strcasecmp HAVE_DECL_STRCASECMP)
+check_function_exists(strncasecmp HAVE_DECL_STRNCASECMP)
+
 # Without a hyphen. This is used for the bash-completion scripts.
 string(TOLOWER "${PACKAGE_SHORTNAME}" PROGRAM_SPREFIX)
 

cmake/FindSDL2.cmake

@@ -26,15 +26,23 @@
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 # Currently works with the following generators:
+# - Unix Makefiles
+# - Ninja
 # - Visual Studio
 
 # Cache variable that allows you to point CMake at a directory containing
 # an extracted development library.
 set(SDL2_DIR "${SDL2_DIR}" CACHE PATH "Location of SDL2 library directory")
 
+# Use pkg-config to find library locations in *NIX environments.
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+    pkg_search_module(PC_SDL2 QUIET sdl2)
+endif()
+
 # Find the include directory.
 find_path(SDL2_INCLUDE_DIR "SDL_version.h"
-          PATHS "${SDL2_DIR}/include")
+    HINTS "${SDL2_DIR}/include" ${PC_SDL2_INCLUDE_DIRS})
 
 # Find the version.  Taken and modified from CMake's FindSDL.cmake.
 if(SDL2_INCLUDE_DIR AND EXISTS "${SDL2_INCLUDE_DIR}/SDL_version.h")
@@ -56,14 +64,14 @@ endif()
 # Find the SDL2 and SDL2main libraries
 if(CMAKE_SIZEOF_VOID_P STREQUAL 8)
     find_library(SDL2_LIBRARY "SDL2"
-                 PATHS "${SDL2_DIR}/lib/x64")
+        HINTS "${SDL2_DIR}/lib/x64" ${PC_SDL2_LIBRARY_DIRS})
     find_library(SDL2_MAIN_LIBRARY "SDL2main"
-                 PATHS "${SDL2_DIR}/lib/x64")
+        HINTS "${SDL2_DIR}/lib/x64" ${PC_SDL2_LIBRARY_DIRS})
 else()
     find_library(SDL2_LIBRARY "SDL2"
-                 PATHS "${SDL2_DIR}/lib/x86")
+        HINTS "${SDL2_DIR}/lib/x86" ${PC_SDL2_LIBRARY_DIRS})
     find_library(SDL2_MAIN_LIBRARY "SDL2main"
-                 PATHS "${SDL2_DIR}/lib/x86")
+        HINTS "${SDL2_DIR}/lib/x86" ${PC_SDL2_LIBRARY_DIRS})
 endif()
 set(SDL2_LIBRARIES "${SDL2_MAIN_LIBRARY}" "${SDL2_LIBRARY}")
 
@@ -78,6 +86,7 @@ if(SDL2_FOUND)
     # SDL2 imported target.
     add_library(SDL2::SDL2 UNKNOWN IMPORTED)
     set_target_properties(SDL2::SDL2 PROPERTIES
+                          INTERFACE_COMPILE_OPTIONS "${PC_SDL2_CFLAGS_OTHER}"
                           INTERFACE_INCLUDE_DIRECTORIES "${SDL2_INCLUDE_DIR}"
                           IMPORTED_LOCATION "${SDL2_LIBRARY}")
 

cmake/FindSDL2_mixer.cmake

@@ -26,15 +26,23 @@
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 # Currently works with the following generators:
+# - Unix Makefiles
+# - Ninja
 # - Visual Studio
 
 # Cache variable that allows you to point CMake at a directory containing
 # an extracted development library.
 set(SDL2_MIXER_DIR "${SDL2_MIXER_DIR}" CACHE PATH "Location of SDL2_mixer library directory")
 
+# Use pkg-config to find library locations in *NIX environments.
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+    pkg_search_module(PC_SDL2_MIXER QUIET SDL2_mixer)
+endif()
+
 # Find the include directory.
 find_path(SDL2_MIXER_INCLUDE_DIR "SDL_mixer.h"
-          PATHS "${SDL2_MIXER_DIR}/include")
+    HINTS "${SDL2_MIXER_DIR}/include" ${PC_SDL2_MIXER_INCLUDE_DIRS})
 
 # Find the version.  Taken and modified from CMake's FindSDL.cmake.
 if(SDL2_MIXER_INCLUDE_DIR AND EXISTS "${SDL2_MIXER_INCLUDE_DIR}/SDL_mixer.h")
@@ -56,10 +64,10 @@ endif()
 # Find the library.
 if(CMAKE_SIZEOF_VOID_P STREQUAL 8)
     find_library(SDL2_MIXER_LIBRARY "SDL2_mixer"
-                 PATHS "${SDL2_MIXER_DIR}/lib/x64")
+        HINTS "${SDL2_MIXER_DIR}/lib/x64" ${PC_SDL2_MIXER_LIBRARY_DIRS})
 else()
-    find_library(SDL2_MIXER_LIBRARY "SDL2"
-                 PATHS "${SDL2_MIXER_DIR}/lib/x86")
+    find_library(SDL2_MIXER_LIBRARY "SDL2_mixer"
+        HINTS "${SDL2_MIXER_DIR}/lib/x86" ${PC_SDL2_MIXER_LIBRARY_DIRS})
 endif()
 
 include(FindPackageHandleStandardArgs)
@@ -73,6 +81,7 @@ if(SDL2_MIXER_FOUND)
     # Imported target.
     add_library(SDL2::mixer UNKNOWN IMPORTED)
     set_target_properties(SDL2::mixer PROPERTIES
+                          INTERFACE_COMPILE_OPTIONS "${PC_SDL2_MIXER_CFLAGS_OTHER}"
                           INTERFACE_INCLUDE_DIRECTORIES "${SDL2_MIXER_INCLUDE_DIR}"
                           INTERFACE_LINK_LIBRARIES SDL2::SDL2
                           IMPORTED_LOCATION "${SDL2_MIXER_LIBRARY}")

cmake/FindSDL2_net.cmake

@@ -26,15 +26,23 @@
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 # Currently works with the following generators:
+# - Unix Makefiles
+# - Ninja
 # - Visual Studio
 
 # Cache variable that allows you to point CMake at a directory containing
 # an extracted development library.
 set(SDL2_NET_DIR "${SDL2_NET_DIR}" CACHE PATH "Location of SDL2_net library directory")
 
+# Use pkg-config to find library locations in *NIX environments.
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+    pkg_search_module(PC_SDL2_NET QUIET SDL2_net)
+endif()
+
 # Find the include directory.
 find_path(SDL2_NET_INCLUDE_DIR "SDL_net.h"
-          PATHS "${SDL2_NET_DIR}/include")
+    HINTS "${SDL2_NET_DIR}/include" ${PC_SDL2_NET_INCLUDE_DIRS})
 
 # Find the version.  Taken and modified from CMake's FindSDL.cmake.
 if(SDL2_NET_INCLUDE_DIR AND EXISTS "${SDL2_NET_INCLUDE_DIR}/SDL_net.h")
@@ -56,10 +64,10 @@ endif()
 # Find the library.
 if(CMAKE_SIZEOF_VOID_P STREQUAL 8)
     find_library(SDL2_NET_LIBRARY "SDL2_net"
-                 PATHS "${SDL2_NET_DIR}/lib/x64")
+        HINTS "${SDL2_NET_DIR}/lib/x64" ${PC_SDL2_NET_LIBRARY_DIRS})
 else()
-    find_library(SDL2_NET_LIBRARY "SDL2"
-                 PATHS "${SDL2_NET_DIR}/lib/x86")
+    find_library(SDL2_NET_LIBRARY "SDL2_net"
+        HINTS "${SDL2_NET_DIR}/lib/x86" ${PC_SDL2_NET_LIBRARY_DIRS})
 endif()
 
 include(FindPackageHandleStandardArgs)
@@ -73,6 +81,7 @@ if(SDL2_NET_FOUND)
     # Imported target.
     add_library(SDL2::net UNKNOWN IMPORTED)
     set_target_properties(SDL2::net PROPERTIES
+                          INTERFACE_COMPILE_OPTIONS "${PC_SDL2_NET_CFLAGS_OTHER}"
                           INTERFACE_INCLUDE_DIRECTORIES "${SDL2_NET_INCLUDE_DIR}"
                           INTERFACE_LINK_LIBRARIES SDL2::SDL2
                           IMPORTED_LOCATION "${SDL2_NET_LIBRARY}")

config.cmake.h

@@ -1,3 +1,7 @@
 #cmakedefine PACKAGE_NAME "@PACKAGE_NAME@"
+#cmakedefine PACKAGE_TARNAME "@PACKAGE_TARNAME@"
 #cmakedefine PACKAGE_STRING "@PACKAGE_STRING@"
 #cmakedefine PROGRAM_PREFIX "@PROGRAM_PREFIX@"
+
+#cmakedefine01 HAVE_DECL_STRCASECMP
+#cmakedefine01 HAVE_DECL_STRNCASECMP

midiproc/CMakeLists.txt

@@ -1,4 +1,6 @@
-add_executable("${PROGRAM_PREFIX}midiproc" buffer.c buffer.h main.c proto.h)
-target_include_directories("${PROGRAM_PREFIX}midiproc"
-                           PRIVATE "../src/" "${CMAKE_CURRENT_BINARY_DIR}/../")
-target_link_libraries("${PROGRAM_PREFIX}midiproc" SDL2::SDL2main SDL2::mixer)
+if(WIN32)
+    add_executable("${PROGRAM_PREFIX}midiproc" buffer.c buffer.h main.c proto.h)
+    target_include_directories("${PROGRAM_PREFIX}midiproc"
+                               PRIVATE "../src/" "${CMAKE_CURRENT_BINARY_DIR}/../")
+    target_link_libraries("${PROGRAM_PREFIX}midiproc" SDL2::SDL2main SDL2::mixer)
+endif()