Rollup of 5 pull requests

configure

@@ -582,6 +582,7 @@ valopt sysconfdir "/etc" "install system configuration files"
 valopt datadir "${CFG_PREFIX}/share" "install data"
 valopt infodir "${CFG_PREFIX}/share/info" "install additional info"
 valopt llvm-root "" "set LLVM root"
+valopt python "" "set path to python"
 valopt jemalloc-root "" "set directory where libjemalloc_pic.a is located"
 valopt build "${DEFAULT_BUILD}" "GNUs ./configure syntax LLVM build triple"
 valopt android-cross-path "/opt/ndk_standalone" "Android NDK standalone path"
@@ -695,7 +696,9 @@ putvar CFG_BOOTSTRAP_KEY
 step_msg "looking for build programs"
 
 probe_need CFG_CURLORWGET  curl wget
-probe_need CFG_PYTHON      python2.7 python2.6 python2 python
+if [ -z "$CFG_PYTHON_PROVIDED" ]; then
+    probe_need CFG_PYTHON      python2.7 python2.6 python2 python
+fi
 
 python_version=$($CFG_PYTHON -V 2>&1)
 if [ $(echo $python_version | grep -c '^Python 2\.[4567]') -ne 1 ]; then
@@ -849,13 +852,6 @@ then
     putvar CFG_LOCAL_RUST_ROOT
 fi
 
-# Force freebsd to build with clang; gcc doesn't like us there
-if [ $CFG_OSTYPE = unknown-freebsd ]
-then
-    step_msg "on FreeBSD, forcing use of clang"
-    CFG_ENABLE_CLANG=1
-fi
-
 # Force bitrig to build with clang; gcc doesn't like us there
 if [ $CFG_OSTYPE = unknown-bitrig ]
 then

mk/docs.mk

@@ -265,7 +265,7 @@ endef
 $(foreach crate,$(CRATES),$(eval $(call DEF_LIB_DOC,$(crate))))
 
 COMPILER_DOC_TARGETS := $(CRATES:%=doc/%/index.html)
-ifdef CFG_COMPILER_DOCS
+ifdef CFG_ENABLE_COMPILER_DOCS
   DOC_TARGETS += $(COMPILER_DOC_TARGETS)
 else
   DOC_TARGETS += $(DOC_CRATES:%=doc/%/index.html)

src/doc/trpl/mutability.md

@@ -159,7 +159,7 @@ b.x = 10; // error: cannot assign to immutable field `b.x`
 
 [struct]: structs.html
 
-However, by using `Cell<T>`, you can emulate field-level mutability:
+However, by using [`Cell<T>`][cell], you can emulate field-level mutability:
 
 ```rust
 use std::cell::Cell;
@@ -176,4 +176,6 @@ point.y.set(7);
 println!("y: {:?}", point.y);
 ```
 
+[cell]: ../std/cell/struct.Cell.html
+
 This will print `y: Cell { value: 7 }`. We’ve successfully updated `y`.

src/librustc_back/target/freebsd_base.rs

@@ -18,11 +18,6 @@ pub fn opts() -> TargetOptions {
         executables: true,
         morestack: true,
         has_rpath: true,
-        pre_link_args: vec!(
-            "-L/usr/local/lib".to_string(),
-            "-L/usr/local/lib/gcc46".to_string(),
-            "-L/usr/local/lib/gcc44".to_string(),
-        ),
 
         .. Default::default()
     }

src/libstd/sys/common/stack.rs

@@ -139,7 +139,6 @@ pub unsafe fn record_os_managed_stack_bounds(stack_lo: usize, _stack_hi: usize)
 pub unsafe fn record_sp_limit(limit: usize) {
     return target_record_sp_limit(limit);
 
-    // x86-64
     #[cfg(all(target_arch = "x86_64",
               any(target_os = "macos", target_os = "ios")))]
     #[inline(always)]
@@ -164,7 +163,6 @@ pub unsafe fn record_sp_limit(limit: usize) {
         asm!("movq $0, %fs:32" :: "r"(limit) :: "volatile")
     }
 
-    // x86
     #[cfg(all(target_arch = "x86",
               any(target_os = "macos", target_os = "ios")))]
     #[inline(always)]
@@ -182,8 +180,8 @@ pub unsafe fn record_sp_limit(limit: usize) {
     unsafe fn target_record_sp_limit(_: usize) {
     }
 
-    // mips, arm - Some brave soul can port these to inline asm, but it's over
-    //             my head personally
+    // mips, arm - The implementations are a bit big for inline asm!
+    //             They can be found in src/rt/arch/$target_arch/record_sp.S
     #[cfg(any(target_arch = "mips",
               target_arch = "mipsel",
               all(target_arch = "arm", not(target_os = "ios"))))]
@@ -221,7 +219,6 @@ pub unsafe fn record_sp_limit(limit: usize) {
 pub unsafe fn get_sp_limit() -> usize {
     return target_get_sp_limit();
 
-    // x86-64
     #[cfg(all(target_arch = "x86_64",
               any(target_os = "macos", target_os = "ios")))]
     #[inline(always)]
@@ -255,7 +252,6 @@ pub unsafe fn get_sp_limit() -> usize {
         return limit;
     }
 
-    // x86
     #[cfg(all(target_arch = "x86",
               any(target_os = "macos", target_os = "ios")))]
     #[inline(always)]
@@ -278,8 +274,8 @@ pub unsafe fn get_sp_limit() -> usize {
         return 1024;
     }
 
-    // mips, arm - Some brave soul can port these to inline asm, but it's over
-    //             my head personally
+    // mips, arm - The implementations are a bit big for inline asm!
+    //             They can be found in src/rt/arch/$target_arch/record_sp.S
     #[cfg(any(target_arch = "mips",
               target_arch = "mipsel",
               all(target_arch = "arm", not(target_os = "ios"))))]