Archive for the ‘Computer/Video Games’ Category

Dwarf Fortress: Likotkod II

Wednesday, May 16th, 2012

I wasn’t doing a good job of recording things, but much has happened in the year or two since I last posted. My fortress has grown to 119 dwarves, I’ve received several new artifacts, and I was attacked by a smallish goblin siege. Unfortunately, the siege came just before I completed the wall around my fort. When the next one arrives, I will be in a much better position to deal with them in an orderly fashion.

There have been several interesting new developments in the DF world, however, and I’m going to just finish out a few construction projects before I update to the latest version and generate a new world. Minecarts, anyone?

DFHack on the Mac 1: Build Process

Monday, April 16th, 2012

I have decided to see if I can get the incredibly useful dfhack utilities for Dwarf Fortress ported to the Mac. Currently, they only exist for Windows and Linux. I created my own fork of the dfhack project on github, and prepared to follow the building instructions.

Downloading cmake was pretty easy; they have a convenient-to-install binary package for the Mac.

Unfortunately, I ran into errors before I even started compiling. Cmake was giving errors about my gcc’s hash map being broken. I’m working on my laptop, which is running OS X 10.6.8 (“Snow Leopard”). I know it’s a version behind (10.7 a.k.a. “Lion” is out now), but with 10.8 (“Mountain Lion”) just around the corner, I’m not going to bother with the Lion upgrade now. The version of gcc included with XCode 3.2 is:

yuzu:~/src/dfhack jonathan$ gcc --version
i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5664)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO

I installed a new gcc from source. The process was quite straightforward, and I am not going to document it here.

yuzu:~/src/dfhack jonathan$ /usr/local/bin/gcc --version
gcc (GCC) 4.6.3
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO

And I told cmake to use that. At that point, I was able to get the Makefiles generated.

From a previous Mac port attempt, there are some _DARWIN defines that control which headers are included. The cmake scripts are setting _LINUX by default, which is breaking on some Linux-specific includes. The first place I’m hitting that is here:

Scanning dependencies of target clsocket
[ 47%] Building CXX object depends/clsocket/CMakeFiles/clsocket.dir/src/SimpleSocket.cpp.o
In file included from /Users/jonathan/src/dfhack/depends/clsocket/src/SimpleSocket.cpp:43:0:
/Users/jonathan/src/dfhack/depends/clsocket/src/SimpleSocket.h:61:29: fatal error: linux/if_packet.h: No such file or directory
compilation terminated.

I edited the CMakeLists.txt files in the dfhack root and the depends/clsocket directory so that if APPLE is defined, to add the -D_DARWIN option instead of -D_LINUX (diff). I have not committed the changes to clsocket anywhere, as I didn’t feel like forking the project just for that one change, plus I’m not entirely confident about how git submodules work.

The next error was the lack of a perl module:

Scanning dependencies of target generate_headers
[ 52%] Generating ../../library/include/df/codegen.out.xml
Can't locate XML/ in @INC (@INC contains: xml /Library/Perl/Updates/5.10.0 /System/Library/Perl/5.10.0/darwin-thread-multi-2level /System/Library/Perl/5.10.0 /Library/Perl/5.10.0/darwin-thread-multi-2level /Library/Perl/5.10.0 /Network/Library/Perl/5.10.0/darwin-thread-multi-2level /Network/Library/Perl/5.10.0 /Network/Library/Perl /System/Library/Perl/Extras/5.10.0/darwin-thread-multi-2level /System/Library/Perl/Extras/5.10.0 .) at xml/ line 15.
BEGIN failed--compilation aborted at xml/ line 15.

I used CPAN to install it.

Next, a missing C library function:

[ 56%] Building CXX object library/CMakeFiles/dfhack.dir/LuaTypes.cpp.o
/Users/jonathan/src/dfhack/library/LuaTypes.cpp: In function ‘void read_field(lua_State*, const DFHack::struct_field_info*, void*)’:
/Users/jonathan/src/dfhack/library/LuaTypes.cpp:463:55: error: ‘strnlen’ was not declared in this scope

This function exists on Windows and Linux, but not OS X. It is basically the same as strlen(), but takes a maximum length parameter, and will not return a value larger than that. I replaced it with a call to strlen() and a manual comparison with the max value (diff). The only way this could backfire is if the string being measured here isn’t NULL-terminated in the case of max length.

Next up comes a template error. I had forgotten how annoying template errors were.

[ 60%] Building CXX object library/CMakeFiles/dfhack.dir/modules/Gui.cpp.o
/Users/jonathan/src/dfhack/library/modules/Gui.cpp: In function ‘void DFHack::Gui::showAnnouncement(std::string, int, bool)’:
/Users/jonathan/src/dfhack/library/modules/Gui.cpp:451:48: error: no matching function for call to ‘min(std::basic_string<char>::size_type, unsigned int)’
/Users/jonathan/src/dfhack/library/modules/Gui.cpp:451:48: note: candidates are:
/usr/local/lib/gcc/x86_64-apple-darwin10.8.0/4.6.3/../../../../include/c++/4.6.3/bits/stl_algobase.h:187:5: note: template<class _Tp> const _Tp& std::min(const _Tp&, const _Tp&)
/usr/local/lib/gcc/x86_64-apple-darwin10.8.0/4.6.3/../../../../include/c++/4.6.3/bits/stl_algobase.h:233:5: note: template<class _Tp, class _Compare> const _Tp& std::min(const _Tp&, const _Tp&, _Compare)
/usr/local/lib/gcc/x86_64-apple-darwin10.8.0/4.6.3/../../../../include/c++/4.6.3/bits/stl_algo.h:4184:5: note: template<class _Tp> _Tp std::min(std::initializer_list<_Tp>)
/usr/local/lib/gcc/x86_64-apple-darwin10.8.0/4.6.3/../../../../include/c++/4.6.3/bits/stl_algo.h:4189:5: note: template<class _Tp, class _Compare> _Tp std::min(std::initializer_list<_Tp>, _Compare)

This is the offending line:

    int size = std::min(message.size(), 73U);

I changed it to 73UL (diff), but I will possibly break it on another system as a result. I will need to revisit this.

There was a missing macro:

[ 58%] Building CXX object library/CMakeFiles/dfhack.dir/Console-linux.cpp.o
/Users/jonathan/src/dfhack/library/Console-linux.cpp: In member function ‘bool DFHack::Private::read_char(unsigned char&)’:
/Users/jonathan/src/dfhack/library/Console-linux.cpp:151:13: error: ‘TEMP_FAILURE_RETRY’ was not declared in this scope

This macro is used under glibc to automatically retry system calls that were interrupted and returned EINTR. The BSD behaviour is to automatically retry, and I believe that this includes Mac OS X. As such, I added an #ifdef _DARWIN and defined a macro that just executes the desired function once and does nothing funny (diff).

Then I ran into an error of the linker including an unnecessary library that did not exist:

[ 52%] Building CXX object library/CMakeFiles/dfhack.dir/Console-linux.cpp.o
Linking CXX shared library libdfhack.dylib
ld: library not found for -lrt

This is the library that, on Linux, provides access to various “realtime” APIs. If I exclude this library, I am not getting any undefined symbol errors, so for the time being I will assume it is either unused, or the relevant functions are already included in another library on OS X. The dependency is defined in library/CMakeLists.txt; I added an IF(APPLE) section where it defines the PROJECT_LIBS variable (diff).

Another somewhat inscrutable C++ error:

/Users/jonathan/src/dfhack/plugins/liquids.cpp:81:15: error: ‘std::string setmode’ redeclared as different kind of symbol
/usr/include/unistd.h:575:7: error: previous declaration of ‘void* setmode(const char*)’
/Users/jonathan/src/dfhack/plugins/liquids.cpp: In function ‘DFHack::command_result df_liquids(DFHack::color_ostream&, std::vector<std::basic_string<char> >&)’:
/Users/jonathan/src/dfhack/plugins/liquids.cpp:257:23: error: assignment of function ‘void* setmode(const char*)’
/Users/jonathan/src/dfhack/plugins/liquids.cpp:257:23: error: cannot convert ‘const char [3]’ to ‘void*(const char*)’ in assignment
/Users/jonathan/src/dfhack/plugins/liquids.cpp:261:23: error: assignment of function ‘void* setmode(const char*)’
/Users/jonathan/src/dfhack/plugins/liquids.cpp:261:23: error: cannot convert ‘const char [3]’ to ‘void*(const char*)’ in assignment
/Users/jonathan/src/dfhack/plugins/liquids.cpp:265:23: error: assignment of function ‘void* setmode(const char*)’
/Users/jonathan/src/dfhack/plugins/liquids.cpp:265:23: error: cannot convert ‘const char [3]’ to ‘void*(const char*)’ in assignment
/Users/jonathan/src/dfhack/plugins/liquids.cpp: In function ‘DFHack::command_result df_liquids_execute(DFHack::color_ostream&)’:
/Users/jonathan/src/dfhack/plugins/liquids.cpp:460:35: error: comparison between distinct pointer types ‘void* (*)(const char*)’ and ‘const char*’ lacks a cast [-fpermissive]
/Users/jonathan/src/dfhack/plugins/liquids.cpp:464:40: error: comparison between distinct pointer types ‘void* (*)(const char*)’ and ‘const char*’ lacks a cast [-fpermissive]
/Users/jonathan/src/dfhack/plugins/liquids.cpp:469:40: error: comparison between distinct pointer types ‘void* (*)(const char*)’ and ‘const char*’ lacks a cast [-fpermissive]

It appears that a file-local static variable named setmode is interfering with the function std::string::setmode(), thanks to the using std::string declaration at the head of the file. Unfortunately, I see no way around this other than not using that namespace (and having to adjust every intentional usage of a string function) or renaming the setmode variable. I opted for the latter, replacing it with set_mode (diff).

And with that, the build was complete.

I am, however, slightly worried about these warnings, which I received many times:

In file included from /Users/jonathan/src/dfhack/library/include/df/map_block.h:17:0,
                 from /Users/jonathan/src/dfhack/library/include/modules/Maps.h:42,
                 from /Users/jonathan/src/dfhack/plugins/lair.cpp:9:
/Users/jonathan/src/dfhack/library/include/df/tile_designation.h:19:38: warning: ‘df::tile_designation::<anonymous struct>::dig’ is too small to hold all values of ‘enum df::enums::tile_dig_designation::tile_dig_designation’ [enabled by default]
/Users/jonathan/src/dfhack/library/include/df/tile_designation.h:27:37: warning: ‘df::tile_designation::<anonymous struct>::liquid_type’ is too small to hold all values of ‘enum df::enums::tile_liquid::tile_liquid’ [enabled by default]
/Users/jonathan/src/dfhack/library/include/df/tile_designation.h:30:34: warning: ‘df::tile_designation::<anonymous struct>::traffic’ is too small to hold all values of ‘enum df::enums::tile_traffic::tile_traffic’ [enabled by default]

At this point, though, I will try and get the library preloading working and see what happens. I expect there will be a variety of interesting debugging to do.

Dwarf Fortress: Likotkod

Thursday, March 1st, 2012

So that you don’t think miniatures are all I do these days, let me tell you a little about my current game of Dwarf Fortress. My intrepid crew of 7 dwarves embarked to an area in the southern end of the world, where some mountains, a forest, and a grassland came together at a brook. It’s always quite hot there, and all the lakes had dried up by the end of the first summer. The brook still flows freely, however, and will provide a good source of power should I ever try to pump magma up from the depths. I’ve started building some above-ground fortifications around my entrance (just some ramps going downwards), and will be stationing marksdwarves to stand on top of them shortly, as I have been having increasingly frequent goblin and kobold incursions as of late. Tragically, this did include one goblin snatcher successfully stealing one of the children from my fort.

Entrance of Fort

Speaking of magma, I decided to explore in a generally downwards direction, hoping to find the fun of the caverns and the magma sea. I did break two layers of caverns, finding a vast underground sea and a number of interesting ores and many giant mushroom trees to be harvested. Unfortunately, my miners happened to dig into a pocket of rock that went down into the magma sea, and my legendary miner died a horrible flaming death upon digging out a diagonal corner that connected to the main body of magma. A memorial slab was erected in her honor, as her flaming corpse mysteriously vanished before I could send anyone to retrieve it. All I found on the stairs was a pile of her clothes and her pick-axe.

That death left me with a mere 15 dwarves, but some combination of my burgeoning metalcrafting industry (which also requires clearcutting the forests, as I have not yet been able to pump up that magma) and the discovery of adamantine veins in the depths triggered successive immigration waves of 30-odd dwarves, and then another 10-15 to bring me to 60.


This left my food, booze, and general accommodations completely overwhelmed. After a brief period where I had 5 dwarves gathered around my well to drink water (oh the horror!), I slaughtered a bunch of animals, planted several more farm plots, brewed more drinks, and also built more stills, butcheries, and kitchens. I believe I am now set for food for a time, although I will still need to keep an eye on it.

I’ve also been trying to rapidly build more bedrooms and workshops, along with all the accoutrements required therefore. I managed to get my mayor and captain of the guard happy with their required accommodations, but not before the mayor mandated that I build 3 ballista arrows and then banned their export. The only thing I have going in my favor for the bedrooms is that in the new version so many of my immigrants are married couples. Two dwarves per room means I only have to build half as much stuff.

Living Quarters

Somewhere in there I also had one of my masons make my first artifact, bumping him up to a legendary engraver. The Emancipated Soot