Update libc crate to 0.2.57

This change updates the libc crate to version 0.2.57.

Import subrepo libc/:libc at cdc48ea36d8d2890dba38e8f779001e6855339a2

1 files changed, 69 insertions, 0 deletions

diff --git a/libc/ci/install-musl.sh b/libc/ci/install-musl.sh
new file mode 100644
index 0000000..ab98c4f
--- /dev/null
+++ b/libc/ci/install-musl.sh
@@ -0,0 +1,69 @@
+#!/usr/bin/env sh
+#
+# Install musl and musl-sanitized linux kernel headers
+# to musl-{$1} directory
+
+set -ex
+
+MUSL_VERSION=1.1.22
+MUSL="musl-${MUSL_VERSION}"
+
+# Download, configure, build, and install musl:
+curl --retry 5 https://www.musl-libc.org/releases/${MUSL}.tar.gz | tar xzf -
+
+cd $MUSL
+case ${1} in
+    aarch64)
+        musl_arch=aarch64
+        kernel_arch=arm64
+        CC=aarch64-linux-gnu-gcc \
+          ./configure --prefix="/musl-${musl_arch}" --enable-wrapper=yes
+        make install -j4
+        ;;
+    arm)
+        musl_arch=arm
+        kernel_arch=arm
+        CC=arm-linux-gnueabihf-gcc CFLAGS="-march=armv6 -marm -mfpu=vfp" \
+          ./configure --prefix="/musl-${musl_arch}" --enable-wrapper=yes
+        make install -j4
+        ;;
+    i686)
+        # cross-compile musl for i686 using the system compiler on an x86_64
+        # system.
+        musl_arch=i686
+        kernel_arch=i386
+        # Specifically pass -m32 in CFLAGS and override CC when running
+        # ./configure, since otherwise the script will fail to find a compiler.
+        CC=gcc CFLAGS="-m32" \
+          ./configure --prefix="/musl-${musl_arch}" --disable-shared --target=i686
+        # unset CROSS_COMPILE when running make; otherwise the makefile will
+        # call the non-existent binary 'i686-ar'.
+        make CROSS_COMPILE= install -j4
+        ;;
+    x86_64)
+        musl_arch=x86_64
+        kernel_arch=x86_64
+        ./configure --prefix="/musl-${musl_arch}"
+        make install -j4
+        ;;
+    *)
+        echo "Unknown target arch: \"${1}\""
+        exit 1
+        ;;
+esac
+
+
+# shellcheck disable=SC2103
+cd ..
+rm -rf $MUSL
+
+# Download, configure, build, and install musl-sanitized kernel headers:
+KERNEL_HEADER_VER="4.4.2-2"
+curl --retry 5 -L \
+     "https://github.com/sabotage-linux/kernel-headers/archive/v${KERNEL_HEADER_VER}.tar.gz" | \
+    tar xzf -
+(
+    cd kernel-headers-${KERNEL_HEADER_VER}
+    make ARCH="${kernel_arch}" prefix="/musl-${musl_arch}" install -j4
+)
+rm -rf kernel-headers-${KERNEL_HEADER_VER}