Auto merge of #50709 - alexcrichton:revert-musl, r=sfackler

Revert #50105 until regression is fixed

Discovered at https://github.com/rust-lang/rust/pull/50105#issuecomment-388630750 it looks like this caused a regression with i686 musl, so let's revert in the meantime while a fix is worked out

11 files changed, 15 insertions, 163 deletions

diff --git a/src/bootstrap/bin/rustc.rs b/src/bootstrap/bin/rustc.rs
index 4607ca5cf9f..6f27402233f 100644
--- a/src/bootstrap/bin/rustc.rs
+++ b/src/bootstrap/bin/rustc.rs
@@ -268,15 +268,6 @@ fn main() {
         if let Ok(host_linker) = env::var("RUSTC_HOST_LINKER") {
             cmd.arg(format!("-Clinker={}", host_linker));
         }
-
-        if let Ok(s) = env::var("RUSTC_HOST_CRT_STATIC") {
-            if s == "true" {
-                cmd.arg("-C").arg("target-feature=+crt-static");
-            }
-            if s == "false" {
-                cmd.arg("-C").arg("target-feature=-crt-static");
-            }
-        }
     }
 
     if env::var_os("RUSTC_PARALLEL_QUERIES").is_some() {
diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 28f5192f2cd..487440becf6 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -489,7 +489,7 @@ class RustBuild(object):
         """
         return os.path.join(self.build_dir, self.build, "stage0")
 
-    def get_toml(self, key, section=None):
+    def get_toml(self, key):
         """Returns the value of the given key in config.toml, otherwise returns None
 
         >>> rb = RustBuild()
@@ -501,29 +501,12 @@ class RustBuild(object):
 
         >>> rb.get_toml("key3") is None
         True
-
-        Optionally also matches the section the key appears in
-
-        >>> rb.config_toml = '[a]\\nkey = "value1"\\n[b]\\nkey = "value2"'
-        >>> rb.get_toml('key', 'a')
-        'value1'
-        >>> rb.get_toml('key', 'b')
-        'value2'
-        >>> rb.get_toml('key', 'c') is None
-        True
         """
-
-        cur_section = None
         for line in self.config_toml.splitlines():
-            section_match = re.match(r'^\s*\[(.*)\]\s*$', line)
-            if section_match is not None:
-                cur_section = section_match.group(1)
-
             match = re.match(r'^{}\s*=(.*)$'.format(key), line)
             if match is not None:
                 value = match.group(1)
-                if section is None or section == cur_section:
-                    return self.get_string(value) or value.strip()
+                return self.get_string(value) or value.strip()
         return None
 
     def cargo(self):
@@ -606,17 +589,7 @@ class RustBuild(object):
         env["LIBRARY_PATH"] = os.path.join(self.bin_root(), "lib") + \
             (os.pathsep + env["LIBRARY_PATH"]) \
             if "LIBRARY_PATH" in env else ""
-        env["RUSTFLAGS"] = "-Cdebuginfo=2 "
-
-        build_section = "target.{}".format(self.build_triple())
-        target_features = []
-        if self.get_toml("crt-static", build_section) == "true":
-            target_features += ["+crt-static"]
-        elif self.get_toml("crt-static", build_section) == "false":
-            target_features += ["-crt-static"]
-        if target_features:
-            env["RUSTFLAGS"] += "-C target-feature=" + (",".join(target_features)) + " "
-
+        env["RUSTFLAGS"] = "-Cdebuginfo=2"
         env["PATH"] = os.path.join(self.bin_root(), "bin") + \
             os.pathsep + env["PATH"]
         if not os.path.isfile(self.cargo()):
diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index cd646b76e83..84d29400669 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -697,10 +697,6 @@ impl<'a> Builder<'a> {
             cargo.env("RUSTC_CRT_STATIC", x.to_string());
         }
 
-        if let Some(x) = self.crt_static(compiler.host) {
-            cargo.env("RUSTC_HOST_CRT_STATIC", x.to_string());
-        }
-
         // Enable usage of unstable features
         cargo.env("RUSTC_BOOTSTRAP", "1");
         self.add_rust_test_threads(&mut cargo);
diff --git a/src/librustc_codegen_llvm/back/link.rs b/src/librustc_codegen_llvm/back/link.rs
index dbfd430a3e2..735c4d2f76f 100644
--- a/src/librustc_codegen_llvm/back/link.rs
+++ b/src/librustc_codegen_llvm/back/link.rs
@@ -625,11 +625,6 @@ fn link_natively(sess: &Session,
     if let Some(args) = sess.target.target.options.pre_link_args.get(&flavor) {
         cmd.args(args);
     }
-    if let Some(args) = sess.target.target.options.pre_link_args_crt.get(&flavor) {
-        if sess.crt_static() {
-            cmd.args(args);
-        }
-    }
     if let Some(ref args) = sess.opts.debugging_opts.pre_link_args {
         cmd.args(args);
     }
@@ -644,18 +639,6 @@ fn link_natively(sess: &Session,
         cmd.arg(root.join(obj));
     }
 
-    if crate_type == config::CrateTypeExecutable && sess.crt_static() {
-        for obj in &sess.target.target.options.pre_link_objects_exe_crt {
-            cmd.arg(root.join(obj));
-        }
-
-        for obj in &sess.target.target.options.pre_link_objects_exe_crt_sys {
-            if flavor == LinkerFlavor::Gcc {
-                cmd.arg(format!("-l:{}", obj));
-            }
-        }
-    }
-
     if sess.target.target.options.is_like_emscripten {
         cmd.arg("-s");
         cmd.arg(if sess.panic_strategy() == PanicStrategy::Abort {
@@ -677,16 +660,6 @@ fn link_natively(sess: &Session,
     for obj in &sess.target.target.options.post_link_objects {
         cmd.arg(root.join(obj));
     }
-    if sess.crt_static() {
-        for obj in &sess.target.target.options.post_link_objects_crt_sys {
-            if flavor == LinkerFlavor::Gcc {
-                cmd.arg(format!("-l:{}", obj));
-            }
-        }
-        for obj in &sess.target.target.options.post_link_objects_crt {
-            cmd.arg(root.join(obj));
-        }
-    }
     if let Some(args) = sess.target.target.options.post_link_args.get(&flavor) {
         cmd.args(args);
     }
diff --git a/src/librustc_target/spec/linux_musl_base.rs b/src/librustc_target/spec/linux_musl_base.rs
index 4594d450c15..293f23eab38 100644
--- a/src/librustc_target/spec/linux_musl_base.rs
+++ b/src/librustc_target/spec/linux_musl_base.rs
@@ -15,8 +15,7 @@ pub fn opts() -> TargetOptions {
 
     // Make sure that the linker/gcc really don't pull in anything, including
     // default objects, libs, etc.
-    base.pre_link_args_crt.insert(LinkerFlavor::Gcc, Vec::new());
-    base.pre_link_args_crt.get_mut(&LinkerFlavor::Gcc).unwrap().push("-nostdlib".to_string());
+    base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-nostdlib".to_string());
 
     // At least when this was tested, the linker would not add the
     // `GNU_EH_FRAME` program header to executables generated, which is required
@@ -56,11 +55,9 @@ pub fn opts() -> TargetOptions {
     //
     // Each target directory for musl has these object files included in it so
     // they'll be included from there.
-    base.pre_link_objects_exe_crt.push("crt1.o".to_string());
-    base.pre_link_objects_exe_crt.push("crti.o".to_string());
-    base.pre_link_objects_exe_crt_sys.push("crtbegin.o".to_string());
-    base.post_link_objects_crt_sys.push("crtend.o".to_string());
-    base.post_link_objects_crt.push("crtn.o".to_string());
+    base.pre_link_objects_exe.push("crt1.o".to_string());
+    base.pre_link_objects_exe.push("crti.o".to_string());
+    base.post_link_objects.push("crtn.o".to_string());
 
     // These targets statically link libc by default
     base.crt_static_default = true;
diff --git a/src/librustc_target/spec/mod.rs b/src/librustc_target/spec/mod.rs
index fb20fe9c891..0f870b5b957 100644
--- a/src/librustc_target/spec/mod.rs
+++ b/src/librustc_target/spec/mod.rs
@@ -422,26 +422,20 @@ pub struct TargetOptions {
     /// Linker to invoke
     pub linker: Option<String>,
 
-    /// Linker arguments that are passed *before* any user-defined libraries.
-    pub pre_link_args: LinkArgs, // ... unconditionally
-    pub pre_link_args_crt: LinkArgs, // ... when linking with a bundled crt
-    /// Objects to link before all others, all except *_sys found within the
+    /// Linker arguments that are unconditionally passed *before* any
+    /// user-defined libraries.
+    pub pre_link_args: LinkArgs,
+    /// Objects to link before all others, always found within the
     /// sysroot folder.
-    pub pre_link_objects_exe: Vec<String>, // ... when linking an executable, unconditionally
-    pub pre_link_objects_exe_crt: Vec<String>, // ... when linking an executable with a bundled crt
-    pub pre_link_objects_exe_crt_sys: Vec<String>, // ... when linking an executable with a bundled
-                                                   //  crt, from the system library search path
+    pub pre_link_objects_exe: Vec<String>, // ... when linking an executable
     pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
     /// Linker arguments that are unconditionally passed after any
     /// user-defined but before post_link_objects.  Standard platform
     /// libraries that should be always be linked to, usually go here.
     pub late_link_args: LinkArgs,
-    /// Objects to link after all others, all except *_sys found within the
+    /// Objects to link after all others, always found within the
     /// sysroot folder.
-    pub post_link_objects: Vec<String>, // ... unconditionally
-    pub post_link_objects_crt: Vec<String>, // ... when linking with a bundled crt
-    pub post_link_objects_crt_sys: Vec<String>, // ... when linking with a bundled crt, from the
-                                                //  system library search path
+    pub post_link_objects: Vec<String>,
     /// Linker arguments that are unconditionally passed *after* any
     /// user-defined libraries.
     pub post_link_args: LinkArgs,
@@ -641,7 +635,6 @@ impl Default for TargetOptions {
             is_builtin: false,
             linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
             pre_link_args: LinkArgs::new(),
-            pre_link_args_crt: LinkArgs::new(),
             post_link_args: LinkArgs::new(),
             asm_args: Vec::new(),
             cpu: "generic".to_string(),
@@ -675,12 +668,8 @@ impl Default for TargetOptions {
             position_independent_executables: false,
             relro_level: RelroLevel::None,
             pre_link_objects_exe: Vec::new(),
-            pre_link_objects_exe_crt: Vec::new(),
-            pre_link_objects_exe_crt_sys: Vec::new(),
             pre_link_objects_dll: Vec::new(),
             post_link_objects: Vec::new(),
-            post_link_objects_crt: Vec::new(),
-            post_link_objects_crt_sys: Vec::new(),
             late_link_args: LinkArgs::new(),
             link_env: Vec::new(),
             archive_format: "gnu".to_string(),
@@ -899,15 +888,10 @@ impl Target {
         key!(is_builtin, bool);
         key!(linker, optional);
         key!(pre_link_args, link_args);
-        key!(pre_link_args_crt, link_args);
         key!(pre_link_objects_exe, list);
-        key!(pre_link_objects_exe_crt, list);
-        key!(pre_link_objects_exe_crt_sys, list);
         key!(pre_link_objects_dll, list);
         key!(late_link_args, link_args);
         key!(post_link_objects, list);
-        key!(post_link_objects_crt, list);
-        key!(post_link_objects_crt_sys, list);
         key!(post_link_args, link_args);
         key!(link_env, env);
         key!(asm_args, list);
@@ -1109,15 +1093,10 @@ impl ToJson for Target {
         target_option_val!(is_builtin);
         target_option_val!(linker);
         target_option_val!(link_args - pre_link_args);
-        target_option_val!(link_args - pre_link_args_crt);
         target_option_val!(pre_link_objects_exe);
-        target_option_val!(pre_link_objects_exe_crt);
-        target_option_val!(pre_link_objects_exe_crt_sys);
         target_option_val!(pre_link_objects_dll);
         target_option_val!(link_args - late_link_args);
         target_option_val!(post_link_objects);
-        target_option_val!(post_link_objects_crt);
-        target_option_val!(post_link_objects_crt_sys);
         target_option_val!(link_args - post_link_args);
         target_option_val!(env - link_env);
         target_option_val!(asm_args);
diff --git a/src/test/run-make-fulldeps/issue-36710/Makefile b/src/test/run-make-fulldeps/issue-36710/Makefile
deleted file mode 100644
index 2cb0b4ccf26..00000000000
--- a/src/test/run-make-fulldeps/issue-36710/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
--include ../tools.mk
-
-all: foo
-	$(call RUN,foo)
-
-foo: foo.rs $(call NATIVE_STATICLIB,foo)
-	$(RUSTC) $< -lfoo $(EXTRACXXFLAGS)
-
-$(TMPDIR)/libfoo.o: foo.cpp
-	$(call COMPILE_OBJ_CXX,$@,$<)
-
-.PHONY: all
diff --git a/src/test/run-make-fulldeps/issue-36710/foo.cpp b/src/test/run-make-fulldeps/issue-36710/foo.cpp
deleted file mode 100644
index fbd0ead7a50..00000000000
--- a/src/test/run-make-fulldeps/issue-36710/foo.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#include <stdint.h>
-
-struct A {
-    A() { v = 1234; }
-    ~A() { v = 1; }
-    uint32_t v;
-};
-
-A a;
-
-extern "C" {
-    uint32_t get() {
-        return a.v;
-    }
-}
diff --git a/src/test/run-make-fulldeps/issue-36710/foo.rs b/src/test/run-make-fulldeps/issue-36710/foo.rs
deleted file mode 100644
index 6e50566ddfd..00000000000
--- a/src/test/run-make-fulldeps/issue-36710/foo.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// Tests that linking to C++ code with global destructors works.
-
-extern { fn get() -> u32; }
-
-fn main() {
-    let i = unsafe { get() };
-    assert_eq!(i, 1234);
-}
diff --git a/src/test/run-make-fulldeps/tools.mk b/src/test/run-make-fulldeps/tools.mk
index 3de358fa500..af1707de6c0 100644
--- a/src/test/run-make-fulldeps/tools.mk
+++ b/src/test/run-make-fulldeps/tools.mk
@@ -59,14 +59,12 @@ endif
 
 ifdef IS_MSVC
 COMPILE_OBJ = $(CC) -c -Fo:`cygpath -w $(1)` $(2)
-COMPILE_OBJ_CXX = $(CXX) -c -Fo:`cygpath -w $(1)` $(2)
 NATIVE_STATICLIB_FILE = $(1).lib
 NATIVE_STATICLIB = $(TMPDIR)/$(call NATIVE_STATICLIB_FILE,$(1))
 OUT_EXE=-Fe:`cygpath -w $(TMPDIR)/$(call BIN,$(1))` \
 	-Fo:`cygpath -w $(TMPDIR)/$(1).obj`
 else
 COMPILE_OBJ = $(CC) -c -o $(1) $(2)
-COMPILE_OBJ_CXX = $(CXX) -c -o $(1) $(2)
 NATIVE_STATICLIB_FILE = lib$(1).a
 NATIVE_STATICLIB = $(call STATICLIB,$(1))
 OUT_EXE=-o $(TMPDIR)/$(1)
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 49d3dec0a58..140c90aaeac 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -2502,7 +2502,7 @@ impl<'test> TestCx<'test> {
                 .env("IS_WINDOWS", "1")
                 .env("MSVC_LIB", format!("'{}' -nologo", lib.display()))
                 .env("CC", format!("'{}' {}", self.config.cc, cflags))
-                .env("CXX", format!("'{}'", &self.config.cxx));
+                .env("CXX", &self.config.cxx);
         } else {
             cmd.env("CC", format!("{} {}", self.config.cc, self.config.cflags))
                 .env("CXX", format!("{} {}", self.config.cxx, self.config.cflags))