Build: Fix install targets, add SLIC3R_FHS, check resource dir on GUI_App init

Fix #1515

src/CMakeLists.txt

@@ -33,6 +33,7 @@ if(PNG_FOUND AND NOT RASTERIZER_FORCE_BUILTIN_LIBPNG)
 else()
     set(ZLIB_LIBRARY "")
     message(WARNING "Using builtin libpng. This can cause crashes on some platforms.")
+    set(SKIP_INSTALL_ALL 1)   # Prevent png+zlib from creating install targets
     add_subdirectory(png/zlib)
     set(ZLIB_INCLUDE_DIR ${PROJECT_SOURCE_DIR}/png/zlib ${CMAKE_CURRENT_BINARY_DIR}/png/zlib)
     include_directories(${ZLIB_INCLUDE_DIR})
@@ -188,3 +189,15 @@ else ()
         VERBATIM
     )
 endif()
+
+# Slic3r binary install target
+if (WIN32)
+    install(TARGETS slic3r RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}")
+    if (MSVC)
+        install(TARGETS slic3r_app_gui RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}")
+        install(TARGETS slic3r_app_console RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}")
+        install(TARGETS slic3r_app_noconsole RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}")
+    endif ()
+else ()
+    install(TARGETS slic3r RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
+endif ()

src/platform/unix/fhs.hpp.in

@@ -0,0 +1,2 @@
+#cmakedefine SLIC3R_FHS @SLIC3R_FHS@
+#define SLIC3R_FHS_RESOURCES "@SLIC3R_FHS_RESOURCES@"

src/slic3r.cpp

@@ -22,6 +22,8 @@
 #include <boost/nowide/cenv.hpp>
 #include <boost/nowide/iostream.hpp>
 
+#include "unix/fhs.hpp"  // Generated by CMake from ../platform/unix/fhs.hpp.in
+
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/Config.hpp"
 #include "libslic3r/Geometry.hpp"
@@ -77,6 +79,10 @@ int main(int argc, char **argv)
     // The resources are packed to 'resources'
     // Path from Slic3r binary to resources:
     boost::filesystem::path path_resources = path_to_binary.parent_path() / "resources";
+#elif defined SLIC3R_FHS
+    // The application is packaged according to the Linux Filesystem Hierarchy Standard
+    // Resources are set to the 'Architecture-independent (shared) data', typically /usr/share or /usr/local/share
+    boost::filesystem::path path_resources = SLIC3R_FHS_RESOURCES;
 #else
     // The application is packed in the .tar.bz archive (or in AppImage) as 'bin/slic3r',
     // The resources are packed to 'resources'

src/slic3r/GUI/GUI_App.cpp

@@ -5,7 +5,6 @@
 
 #include <boost/lexical_cast.hpp>
 #include <boost/algorithm/string.hpp>
-#include <boost/filesystem.hpp>
 
 #include <wx/stdpaths.h>
 #include <wx/imagpng.h>
@@ -15,6 +14,7 @@
 #include <wx/filedlg.h>
 #include <wx/dir.h>
 #include <wx/wupdlock.h>
+#include <wx/filefn.h>
 
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/Model.hpp"
@@ -83,6 +83,11 @@ GUI_App::GUI_App()
 
 bool GUI_App::OnInit()
 {
+    // Verify resources path
+    const wxString resources_dir = from_u8(Slic3r::resources_dir());
+    wxCHECK_MSG(wxDirExists(resources_dir), false,
+        wxString::Format("Resources path does not exist or is not a directory: %s", resources_dir));
+
 #if ENABLE_IMGUI
     wxCHECK_MSG(m_imgui->init(), false, "Failed to initialize ImGui");
 #endif // ENABLE_IMGUI