diff --git a/.gitignore b/.gitignore
index 7cdfebc..2d12042 100644
--- a/.gitignore
+++ b/.gitignore
@@ -220,3 +220,11 @@
 /rust-1.36.0-powerpc64-unknown-linux-gnu.tar.xz
 /rust-1.36.0-s390x-unknown-linux-gnu.tar.xz
 /rust-1.36.0-x86_64-unknown-linux-gnu.tar.xz
+/rustc-1.38.0-src.tar.xz
+/rust-1.37.0-aarch64-unknown-linux-gnu.tar.xz
+/rust-1.37.0-armv7-unknown-linux-gnueabihf.tar.xz
+/rust-1.37.0-i686-unknown-linux-gnu.tar.xz
+/rust-1.37.0-powerpc64le-unknown-linux-gnu.tar.xz
+/rust-1.37.0-powerpc64-unknown-linux-gnu.tar.xz
+/rust-1.37.0-s390x-unknown-linux-gnu.tar.xz
+/rust-1.37.0-x86_64-unknown-linux-gnu.tar.xz
diff --git a/0001-WIP-minimize-the-rust-std-component.patch b/0001-WIP-minimize-the-rust-std-component.patch
new file mode 100644
index 0000000..04be717
--- /dev/null
+++ b/0001-WIP-minimize-the-rust-std-component.patch
@@ -0,0 +1,74 @@
+From 2bf05f208272cd58c57f4d7d8d0e10fdb22e8719 Mon Sep 17 00:00:00 2001
+From: Josh Stone <jistone@redhat.com>
+Date: Fri, 27 Sep 2019 12:33:08 -0700
+Subject: [PATCH] [WIP] minimize the rust-std component
+
+---
+ src/bootstrap/dist.rs | 45 +++++++++++++++----------------------------
+ 1 file changed, 16 insertions(+), 29 deletions(-)
+
+diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
+index 552965863d10..76fbd07f9fb5 100644
+--- a/src/bootstrap/dist.rs
++++ b/src/bootstrap/dist.rs
+@@ -667,41 +667,28 @@ impl Step for Std {
+             return distdir(builder).join(format!("{}-{}.tar.gz", name, target));
+         }
+ 
+-        // We want to package up as many target libraries as possible
+-        // for the `rust-std` package, so if this is a host target we
+-        // depend on librustc and otherwise we just depend on libtest.
+-        if builder.hosts.iter().any(|t| t == target) {
+-            builder.ensure(compile::Rustc { compiler, target });
+-        } else {
+-            if builder.no_std(target) == Some(true) {
+-                // the `test` doesn't compile for no-std targets
+-                builder.ensure(compile::Std { compiler, target });
+-            } else {
+-                builder.ensure(compile::Test { compiler, target });
+-            }
+-        }
++        builder.ensure(compile::Std { compiler, target });
++        builder.ensure(compile::Test { compiler, target });
+ 
+         let image = tmpdir(builder).join(format!("{}-{}-image", name, target));
+         let _ = fs::remove_dir_all(&image);
+ 
+-        let dst = image.join("lib/rustlib").join(target);
++        let dst = image.join("lib/rustlib").join(target).join("lib");
+         t!(fs::create_dir_all(&dst));
+-        let mut src = builder.sysroot_libdir(compiler, target).to_path_buf();
+-        src.pop(); // Remove the trailing /lib folder from the sysroot_libdir
+-        builder.cp_filtered(&src, &dst, &|path| {
+-            if let Some(name) = path.file_name().and_then(|s| s.to_str()) {
+-                if name == builder.config.rust_codegen_backends_dir.as_str() {
+-                    return false
+-                }
+-                if name == "bin" {
+-                    return false
+-                }
+-                if name.contains("LLVM") {
+-                    return false
+-                }
++
++        let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
++        let stamp = dbg!(compile::libstd_stamp(builder, compiler_to_use, target));
++        for (path, host) in builder.read_stamp_file(&stamp) {
++            if !host {
++                builder.copy(&path, &dst.join(path.file_name().unwrap()));
+             }
+-            true
+-        });
++        }
++        let stamp = dbg!(compile::libtest_stamp(builder, compiler_to_use, target));
++        for (path, host) in builder.read_stamp_file(&stamp) {
++            if !host {
++                builder.copy(&path, &dst.join(path.file_name().unwrap()));
++            }
++        }
+ 
+         let mut cmd = rust_installer(builder);
+         cmd.arg("generate")
+-- 
+2.21.0
+
diff --git a/rust.spec b/rust.spec
index 6f76926..6d1ab3a 100644
--- a/rust.spec
+++ b/rust.spec
@@ -9,10 +9,10 @@
 # e.g. 1.10.0 wants rustc: 1.9.0-2016-05-24
 # or nightly wants some beta-YYYY-MM-DD
 # Note that cargo matches the program version here, not its crate version.
-%global bootstrap_rust 1.36.0
-%global bootstrap_cargo 1.36.0
-%global bootstrap_channel 1.36.0
-%global bootstrap_date 2019-07-04
+%global bootstrap_rust 1.37.0
+%global bootstrap_cargo 1.37.0
+%global bootstrap_channel 1.37.0
+%global bootstrap_date 2019-08-15
 
 # Only the specified arches will use bootstrap binaries.
 #global bootstrap_arches %%{rust_arches}
@@ -48,8 +48,8 @@
 %endif
 
 Name:           rust
-Version:        1.37.0
-Release:        1%{?dist}
+Version:        1.38.0
+Release:        2%{?dist}
 Summary:        The Rust Programming Language
 License:        (ASL 2.0 or MIT) and (BSD and MIT)
 # ^ written as: (rust itself) and (bundled libraries)
@@ -67,6 +67,13 @@ Source0:        https://static.rust-lang.org/dist/%{rustc_package}.tar.xz
 # We do have the necessary fix in our LLVM 7.
 Patch1:         rust-pr57840-llvm7-debuginfo-variants.patch
 
+# Mask a warning-as-error when rebuilding 1.38 with 1.38
+Patch2:         rustc-1.38.0-rebuild-bootstrap.patch
+
+# Reduce the size of rust-std
+# https://github.com/rust-lang/rust/pull/64823
+Patch3:         0001-WIP-minimize-the-rust-std-component.patch
+
 # Get the Rust triple for any arch.
 %{lua: function rust_triple(arch)
   local abi = "gnu"
@@ -397,6 +404,8 @@ test -f '%{local_rust_root}/bin/rustc'
 %setup -q -n %{rustc_package}
 
 %patch1 -p1 -R
+%patch2 -p1
+%patch3 -p1
 
 %if "%{python}" == "python3"
 sed -i.try-py3 -e '/try python2.7/i try python3 "$@"' ./configure
@@ -449,6 +458,10 @@ sed -i.ffi -e '$a #[link(name = "ffi")] extern {}' \
 find vendor -name .cargo-checksum.json \
   -exec sed -i.uncheck -e 's/"files":{[^}]*}/"files":{ }/' '{}' '+'
 
+# Sometimes Rust sources start with #![...] attributes, and "smart" editors think
+# it's a shebang and make them executable. Then brp-mangle-shebangs gets upset...
+find -name '*.rs' -type f -perm /111 -exec chmod -v -x '{}' '+'
+
 
 %build
 
@@ -534,9 +547,11 @@ find %{buildroot}%{_libdir} -maxdepth 1 -type f -name '*.so' \
 (cd "%{buildroot}%{rustlibdir}/%{rust_triple}/lib" &&
  find ../../../../%{_lib} -maxdepth 1 -name '*.so' |
  while read lib; do
-   # make sure they're actually identical!
-   cmp "$lib" "${lib##*/}"
-   ln -v -f -s -t . "$lib"
+   if [ -f "${lib##*/}" ]; then
+     # make sure they're actually identical!
+     cmp "$lib" "${lib##*/}"
+     ln -v -f -s -t . "$lib"
+   fi
  done)
 
 # Remove installer artifacts (manifests, uninstall scripts, etc.)
@@ -700,6 +715,12 @@ rm -f %{buildroot}%{rustlibdir}/etc/lldb_*.py*
 
 
 %changelog
+* Fri Sep 27 2019 Josh Stone <jistone@redhat.com> - 1.38.0-2
+- Filter the libraries included in rust-std (rhbz1756487)
+
+* Thu Sep 26 2019 Josh Stone <jistone@redhat.com> - 1.38.0-1
+- Update to 1.38.0.
+
 * Thu Aug 15 2019 Josh Stone <jistone@redhat.com> - 1.37.0-1
 - Update to 1.37.0.
 
diff --git a/rustc-1.38.0-rebuild-bootstrap.patch b/rustc-1.38.0-rebuild-bootstrap.patch
new file mode 100644
index 0000000..07f59a0
--- /dev/null
+++ b/rustc-1.38.0-rebuild-bootstrap.patch
@@ -0,0 +1,10 @@
+--- rustc-1.38.0-src/src/bootstrap/builder.rs	2019-09-23 14:15:52.000000000 -0700
++++ rustc-1.38.0-src/src/bootstrap/builder.rs	2019-09-26 10:45:49.663995011 -0700
+@@ -140,6 +140,7 @@
+ 
+ impl StepDescription {
+     fn from<S: Step>() -> StepDescription {
++        #[allow(unused_unsafe)] // for rebuild bootstrapping
+         StepDescription {
+             default: S::DEFAULT,
+             only_hosts: S::ONLY_HOSTS,
diff --git a/sources b/sources
index d7fa41b..c280199 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (rustc-1.37.0-src.tar.xz) = bfee43f578e6d44ead950b870b9fd31087e1bd3f917611f5dce7ad56504b83185edf43e297e8d1304e9e97b9a580d1e6adf6608ab8ed6dee0dc8c5153cdbc5d4
+SHA512 (rustc-1.38.0-src.tar.xz) = b756d29a7a222bc7b5c7f42ff397346ab840f78e559f93e6e36b65e76eea525cf429899fe4de9fb8966623a2225b552feef9fa831bee50f9e25c976fa2af8c0a
diff --git a/sources-bootstrap b/sources-bootstrap
index 854a3f7..00b3ee0 100644
--- a/sources-bootstrap
+++ b/sources-bootstrap
@@ -1,8 +1,8 @@
-SHA512 (rustc-1.37.0-src.tar.xz) = bfee43f578e6d44ead950b870b9fd31087e1bd3f917611f5dce7ad56504b83185edf43e297e8d1304e9e97b9a580d1e6adf6608ab8ed6dee0dc8c5153cdbc5d4
-SHA512 (rust-1.36.0-aarch64-unknown-linux-gnu.tar.xz) = 77ffd9aa0dfdbb886a51c8d17e3e348c777226e859a48374dad8be20b9a3c7130c7f46d9173753e4ac4a264b45610767ba2625df4192773913892a13a255d3d6
-SHA512 (rust-1.36.0-armv7-unknown-linux-gnueabihf.tar.xz) = b31e34f44df17d89f9f2a609a5b5b2320f43691e06ead257d893766abf8764a158adff0265dd60bf1f63dd98f0bf6bc64ae3b9e9f45200fbd7dfcaec3ba85d01
-SHA512 (rust-1.36.0-i686-unknown-linux-gnu.tar.xz) = 34bcb93ec7a313a28ac20cd853e37419c4607f4035a367015826bd797401a2ada20ee99ae9028b6115c9db8aa1d4f74b74fb08ed09ab528d5946bc26c754b182
-SHA512 (rust-1.36.0-powerpc64le-unknown-linux-gnu.tar.xz) = 02f32b544b0a55ba6f6fc4852f18766107bc0ce2c50488db11605e8a10e5965dd44e8332905c00080b08576370f2f0297ecbe12ba9fe01b4c24cdb9fd03ad64f
-SHA512 (rust-1.36.0-powerpc64-unknown-linux-gnu.tar.xz) = 20bdd2b427549c866343962abefc4ffc356a1cb6965c754f28f19b05c234cb9c0abccbce036013deba1dc7699c2889ec954fff2b944953385624be54ee7a733e
-SHA512 (rust-1.36.0-s390x-unknown-linux-gnu.tar.xz) = c637b8f50cbce3333280f43ce4b97d3f75ddae429ee34461837c3c3869e20aed8c5e76f7a58998f617dc0ffc2e6afd00908e5de05f4c7ed9a8c34d5dbc7ce916
-SHA512 (rust-1.36.0-x86_64-unknown-linux-gnu.tar.xz) = 3f14dda1e09ef8c8168600f4d70ba60cb2a1086ad9edb5eed708d0ffc16fdb9c582ce350a93afcd64b78f87737e37d4f099703835a1ec9837a5721c2335e17c7
+SHA512 (rustc-1.38.0-src.tar.xz) = b756d29a7a222bc7b5c7f42ff397346ab840f78e559f93e6e36b65e76eea525cf429899fe4de9fb8966623a2225b552feef9fa831bee50f9e25c976fa2af8c0a
+SHA512 (rust-1.37.0-aarch64-unknown-linux-gnu.tar.xz) = c70054f589aa2aecfbd6a89f567306e0cf5d3eb56e5a544ced0a5d212f14033dab10559d22dd6b07945e45a25d8de14fc7897c9d24c0d8149548a06b404ca9d2
+SHA512 (rust-1.37.0-armv7-unknown-linux-gnueabihf.tar.xz) = 6d9e055f36a2e912f30bebb25afdd3188019a438f208d3db67b38078bd5c37633c38fd48da15ba80640399babf89221e727a2bf43990aee269fcc5c91cd412b4
+SHA512 (rust-1.37.0-i686-unknown-linux-gnu.tar.xz) = b59377350f82efd10c7afe0f7a28ecbd5355719d841d40c98bec0f01961233f7a19bed2581a111a76cde8dd8dc68a019fa7d3da66cb7ebcb002ba52a14a7e573
+SHA512 (rust-1.37.0-powerpc64le-unknown-linux-gnu.tar.xz) = 366c8920448000bfb4baa3a47588a1c7bc81e18afb8d40f0efc824e429e9e6900efbdb4c9003fb45b9d8595328bd612bd63f390a7d3dedbb30b7dc57fc12abf3
+SHA512 (rust-1.37.0-powerpc64-unknown-linux-gnu.tar.xz) = e8e5cf1c64bd3eec389cef022e1c7bae4618fb6966505d2e762d10e7f443fece43b8b95c989c020bdf739abaf9c3f036230df46f6477a2ccd517a7bdef2ba0d7
+SHA512 (rust-1.37.0-s390x-unknown-linux-gnu.tar.xz) = 14f403d3ce9df2a2baba1db13c9f039d7118d7e0c8285ca19ea0284c32e80c3f786660dedef4d1758b2227f91732b8e7deccbf3f38c2b3491738c1408d6bfd0e
+SHA512 (rust-1.37.0-x86_64-unknown-linux-gnu.tar.xz) = c4d48aa12cb929d6600f9cce81bb612c504aa1b3b3f8e76352af3a76b737dcbe0d31e8d139c17884b11aef9f12a55c4908fb8f3ff63dfa92533e4bd0a729914f