Port Rust to DragonFlyBSD

Not included are two required patches:

* LLVM: segmented stack support for DragonFly [1]

* jemalloc: simple configure patches

[1]: http://reviews.llvm.org/D4705

configure

@@ -291,6 +291,10 @@ case $CFG_OSTYPE in
         CFG_OSTYPE=unknown-freebsd
         ;;
 
+    DragonFly)
+        CFG_OSTYPE=unknown-dragonfly
+        ;;
+
     Darwin)
         CFG_OSTYPE=apple-darwin
         ;;

mk/platform.mk

@@ -580,6 +580,33 @@ CFG_LDPATH_x86_64-unknown-freebsd :=
 CFG_RUN_x86_64-unknown-freebsd=$(2)
 CFG_RUN_TARG_x86_64-unknown-freebsd=$(call CFG_RUN_x86_64-unknown-freebsd,,$(2))
 
+# x86_64-pc-dragonfly-elf configuration
+CC_x86_64-unknown-dragonfly=$(CC)
+CXX_x86_64-unknown-dragonfly=$(CXX)
+CPP_x86_64-unknown-dragonfly=$(CPP)
+AR_x86_64-unknown-dragonfly=$(AR)
+CFG_LIB_NAME_x86_64-unknown-dragonfly=lib$(1).so
+CFG_STATIC_LIB_NAME_x86_64-unknown-dragonfly=lib$(1).a
+CFG_LIB_GLOB_x86_64-unknown-dragonfly=lib$(1)-*.so
+CFG_LIB_DSYM_GLOB_x86_64-unknown-dragonfly=$(1)-*.dylib.dSYM
+CFG_CFLAGS_x86_64-unknown-dragonfly := -I/usr/include -I/usr/local/include $(CFLAGS)
+CFG_GCCISH_CFLAGS_x86_64-unknown-dragonfly := -Wall -Werror -g -fPIC -I/usr/include -I/usr/local/include $(CFLAGS)
+CFG_GCCISH_LINK_FLAGS_x86_64-unknown-dragonfly := -shared -fPIC -g -pthread  -lrt
+CFG_GCCISH_DEF_FLAG_x86_64-unknown-dragonfly := -Wl,--export-dynamic,--dynamic-list=
+CFG_GCCISH_PRE_LIB_FLAGS_x86_64-unknown-dragonfly := -Wl,-whole-archive
+CFG_GCCISH_POST_LIB_FLAGS_x86_64-unknown-dragonfly := -Wl,-no-whole-archive
+CFG_DEF_SUFFIX_x86_64-unknown-dragonfly := .bsd.def
+CFG_LLC_FLAGS_x86_64-unknown-dragonfly :=
+CFG_INSTALL_NAME_x86_64-unknown-dragonfly =
+CFG_LIBUV_LINK_FLAGS_x86_64-unknown-dragonfly := -pthread  -lkvm
+CFG_EXE_SUFFIX_x86_64-unknown-dragonfly :=
+CFG_WINDOWSY_x86_64-unknown-dragonfly :=
+CFG_UNIXY_x86_64-unknown-dragonfly := 1
+CFG_PATH_MUNGE_x86_64-unknown-dragonfly :=
+CFG_LDPATH_x86_64-unknown-dragonfly :=
+CFG_RUN_x86_64-unknown-dragonfly=$(2)
+CFG_RUN_TARG_x86_64-unknown-dragonfly=$(call CFG_RUN_x86_64-unknown-dragonfly,,$(2))
+
 
 # The -Qunused-arguments sidesteps spurious warnings from clang
 define FILTER_FLAGS

mk/rt.mk

@@ -171,6 +171,10 @@ else ifeq ($(OSTYPE_$(1)), apple-ios)
   JEMALLOC_ARGS_$(1) := --disable-tls
 else ifeq ($(OSTYPE_$(1)), unknown-freebsd)
   LIBUV_OSTYPE_$(1) := freebsd
+else ifeq ($(OSTYPE_$(1)), unknown-dragonfly)
+  LIBUV_OSTYPE_$(1) := freebsd
+  # required on DragonFly, otherwise gyp fails with a Python exception
+  LIBUV_GYP_ARGS_$(1) := --no-parallel
 else ifeq ($(OSTYPE_$(1)), linux-androideabi)
   LIBUV_OSTYPE_$(1) := android
   LIBUV_ARGS_$(1) := PLATFORM=android host=android OS=linux
@@ -202,7 +206,7 @@ $$(LIBUV_MAKEFILE_$(1)): $$(LIBUV_DEPS) $$(MKFILE_DEPS) $$(LIBUV_STAMP_$(1))
 	 $$(CFG_PYTHON) ./gyp_uv.py -f make -Dtarget_arch=$$(LIBUV_ARCH_$(1)) \
 	   -D ninja \
 	   -DOS=$$(LIBUV_OSTYPE_$(1)) \
-	   -Goutput_dir=$$(@D) --generator-output $$(@D))
+	   -Goutput_dir=$$(@D) $$(LIBUV_GYP_ARGS_$(1)) --generator-output $$(@D))
 	touch $$@
 
 # Windows has a completely different build system for libuv because of mingw. In

src/doc/rust.md

@@ -2001,7 +2001,7 @@ The following configurations must be defined by the implementation:
    `"unix"` or `"windows"`. The value of this configuration option is defined as
    a configuration itself, like `unix` or `windows`.
  * `target_os = "..."`. Operating system of the target, examples include
-   `"win32"`, `"macos"`, `"linux"`, `"android"` or `"freebsd"`.
+   `"win32"`, `"macos"`, `"linux"`, `"android"`, `"freebsd"` or `"dragonfly"`.
  * `target_word_size = "..."`. Target word size in bits. This is set to `"32"`
    for targets with 32-bit pointers, and likewise set to `"64"` for 64-bit
    pointers.

src/etc/local_stage0.sh

@@ -18,7 +18,7 @@ LIB_PREFIX=lib
 
 OS=`uname -s`
 case $OS in
-    ("Linux"|"FreeBSD")
+    ("Linux"|"FreeBSD"|"DragonFly")
     BIN_SUF=
     LIB_SUF=.so
     break
@@ -58,3 +58,6 @@ cp ${PREFIX}/${LIB_DIR}/${LIB_PREFIX}extra*${LIB_SUF} ${TARG_DIR}/stage0/${LIB_D
 cp ${PREFIX}/${LIB_DIR}/${LIB_PREFIX}rust*${LIB_SUF} ${TARG_DIR}/stage0/${LIB_DIR}/
 cp ${PREFIX}/${LIB_DIR}/${LIB_PREFIX}std*${LIB_SUF} ${TARG_DIR}/stage0/${LIB_DIR}/
 cp ${PREFIX}/${LIB_DIR}/${LIB_PREFIX}syntax*${LIB_SUF} ${TARG_DIR}/stage0/${LIB_DIR}/
+
+# do not fail if one of the above fails, as all we need is a working rustc!
+exit 0

src/etc/mklldeps.py

@@ -56,6 +56,8 @@ def run(args):
         os = 'linux'
     elif 'freebsd' in os:
         os = 'freebsd'
+    elif 'dragonfly' in os:
+        os = 'dragonfly'
     elif 'android' in os:
         os = 'android'
     elif 'win' in os or 'mingw' in os:

src/libgreen/stack.rs

@@ -25,10 +25,14 @@ pub struct Stack {
 // anyway), but some platforms don't support it at all. For example, it appears
 // that there's a bug in freebsd that MAP_STACK implies MAP_FIXED (so it always
 // fails): http://lists.freebsd.org/pipermail/freebsd-bugs/2011-July/044840.html
-#[cfg(not(windows), not(target_os = "freebsd"))]
+//
+// DragonFly BSD also seems to suffer from the same problem. When MAP_STACK is
+// used, it returns the same `ptr` multiple times.
+#[cfg(not(windows), not(target_os = "freebsd"), not(target_os = "dragonfly"))]
 static STACK_FLAGS: libc::c_int = libc::MAP_STACK | libc::MAP_PRIVATE |
                                   libc::MAP_ANON;
 #[cfg(target_os = "freebsd")]
+#[cfg(target_os = "dragonfly")]
 static STACK_FLAGS: libc::c_int = libc::MAP_PRIVATE | libc::MAP_ANON;
 #[cfg(windows)]
 static STACK_FLAGS: libc::c_int = 0;