initial attempt to add aarch64-unknown-linux-musl to dist-linux-arm

src/ci/docker/host-x86_64/dist-arm-linux/Dockerfile

@@ -6,6 +6,14 @@ RUN sh /scripts/cross-apt-packages.sh
 COPY scripts/crosstool-ng-1.24.sh /scripts/
 RUN sh /scripts/crosstool-ng-1.24.sh
 
+WORKDIR /build
+
+COPY scripts/musl-toolchain.sh /build/
+# We need to mitigate rust-lang/rust#34978 when compiling musl itself as well
+RUN CFLAGS="-Wa,--compress-debug-sections=none -Wl,--compress-debug-sections=none" \
+    CXXFLAGS="-Wa,--compress-debug-sections=none -Wl,--compress-debug-sections=none" \
+    bash musl-toolchain.sh aarch64 && rm -rf build
+
 COPY scripts/rustbuild-setup.sh /scripts/
 RUN sh /scripts/rustbuild-setup.sh
 USER rustbuild
@@ -25,7 +33,8 @@ ENV CC_arm_unknown_linux_gnueabi=arm-unknown-linux-gnueabi-gcc \
     AR_arm_unknown_linux_gnueabi=arm-unknown-linux-gnueabi-ar \
     CXX_arm_unknown_linux_gnueabi=arm-unknown-linux-gnueabi-g++
 
-ENV HOSTS=arm-unknown-linux-gnueabi
+ENV HOSTS=arm-unknown-linux-gnueabi,aarch64-unknown-linux-musl
 
-ENV RUST_CONFIGURE_ARGS --enable-full-tools --disable-docs
+ENV RUST_CONFIGURE_ARGS --enable-full-tools --disable-docs --musl-root-aarch64=/usr/local/aarch64-linux-musl \
+    --set target.aarch64-unknown-linux-musl.crt-static=false
 ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/host-x86_64/dist-arm-linux/arm-linux-gnueabi.config

@@ -14,6 +14,7 @@ CT_CONFIGURE_has_autoconf_2_65_or_newer=y
 CT_CONFIGURE_has_autoreconf_2_65_or_newer=y
 CT_CONFIGURE_has_automake_1_15_or_newer=y
 CT_CONFIGURE_has_gnu_m4_1_4_12_or_newer=y
+CT_CONFIGURE_has_python_3_4_or_newer=y
 CT_CONFIGURE_has_bison_2_7_or_newer=y
 CT_CONFIGURE_has_python=y
 CT_CONFIGURE_has_git=y
@@ -132,12 +133,6 @@ CT_ARCH_ARM=y
 # CT_ARCH_XTENSA is not set
 CT_ARCH="arm"
 CT_ARCH_CHOICE_KSYM="ARM"
-# CT_ARCH_ALPHA_EV4 is not set
-# CT_ARCH_ALPHA_EV45 is not set
-# CT_ARCH_ALPHA_EV5 is not set
-# CT_ARCH_ALPHA_EV56 is not set
-# CT_ARCH_ALPHA_EV6 is not set
-# CT_ARCH_ALPHA_EV67 is not set
 CT_ARCH_CPU=""
 CT_ARCH_TUNE=""
 CT_ARCH_ARM_SHOW=y
@@ -371,8 +366,6 @@ CT_ALL_BINUTILS_CHOICES="BINUTILS"
 # C-library
 #
 CT_LIBC_GLIBC=y
-# CT_LIBC_NEWLIB is not set
-# CT_LIBC_NONE is not set
 # CT_LIBC_UCLIBC is not set
 CT_LIBC="glibc"
 CT_LIBC_CHOICE_KSYM="GLIBC"
@@ -389,6 +382,7 @@ CT_GLIBC_USE="GLIBC"
 CT_GLIBC_PKG_NAME="glibc"
 CT_GLIBC_SRC_RELEASE=y
 CT_GLIBC_PATCH_ORDER="global"
+# CT_GLIBC_V_2_29 is not set
 # CT_GLIBC_V_2_28 is not set
 # CT_GLIBC_V_2_27 is not set
 # CT_GLIBC_V_2_26 is not set
@@ -407,7 +401,6 @@ CT_GLIBC_ARCHIVE_FORMATS=".tar.xz .tar.bz2 .tar.gz"
 CT_GLIBC_SIGNATURE_FORMAT="packed/.sig"
 CT_GLIBC_2_29_or_older=y
 CT_GLIBC_older_than_2_29=y
-CT_GLIBC_REQUIRE_older_than_2_29=y
 CT_GLIBC_2_27_or_older=y
 CT_GLIBC_older_than_2_27=y
 CT_GLIBC_2_26_or_older=y
@@ -447,12 +440,6 @@ CT_GLIBC_FORCE_UNWIND=y
 CT_GLIBC_KERNEL_VERSION_AS_HEADERS=y
 # CT_GLIBC_KERNEL_VERSION_CHOSEN is not set
 CT_GLIBC_MIN_KERNEL="3.2.101"
-# CT_GLIBC_SSP_DEFAULT is not set
-# CT_GLIBC_SSP_NO is not set
-# CT_GLIBC_SSP_YES is not set
-# CT_GLIBC_SSP_ALL is not set
-# CT_GLIBC_SSP_STRONG is not set
-# CT_NEWLIB_USE_REDHAT is not set
 CT_ALL_LIBC_CHOICES="AVR_LIBC BIONIC GLIBC MINGW_W64 MOXIEBOX MUSL NEWLIB NONE UCLIBC"
 CT_LIBC_SUPPORT_THREADS_ANY=y
 CT_LIBC_SUPPORT_THREADS_NATIVE=y

src/tools/build-manifest/src/main.rs

@@ -16,6 +16,7 @@ use std::process::{Command, Stdio};
 
 static HOSTS: &[&str] = &[
     "aarch64-unknown-linux-gnu",
+    "aarch64-unknown-linux-musl",
     "arm-unknown-linux-gnueabi",
     "arm-unknown-linux-gnueabihf",
     "armv7-unknown-linux-gnueabihf",