1 files changed, 80 insertions, 0 deletions
diff --git a/utils/llvm-targets/gen-data-layout.sh b/utils/llvm-targets/gen-data-layout.sh
new file mode 100755
index 0000000000..315222fe1d
--- /dev/null
+++ b/utils/llvm-targets/gen-data-layout.sh
@@ -0,0 +1,80 @@
+#!/bin/bash
+#
+# llvm-target generator
+#
+# Author: Moritz Angermann <moritz.angermann@gmail.com>
+#
+# This file generates the `llvm-targets` file, which contains the
+# data-layout, cpu and attributes for the target.  This is done by
+# querying `clang` for the data-layout, cpu and attributes based
+# on a given target.
+#
+# To utilize it run it as
+#
+#  $ ./gen-data-layout.sh > llvm-targets
+#
+# Add missing targets to the list below to have them included in
+# llvm-targets file.
+
+# Target sets
+WINDOWS_x86="i386-unknown-windows i686-unknown-windows x86_64-unknown-windows"
+LINUX_ARM="arm-unknown-linux-gnueabihf armv6-unknown-linux-gnueabihf armv7-unknown-linux-gnueabihf aarch64-unknown-linux-gnu aarch64-unknown-linux"
+LINUX_x86="i386-unknown-linux-gnu i386-unknown-linux x86_64-unknown-linux-gnu x86_64-unknown-linux"
+ANDROID="armv7-unknown-linux-androideabi aarch64-unknown-linux-android"
+QNX="arm-unknown-nto-qnx-eabi"
+MACOS="i386-apple-darwin x86_64-apple-darwin"
+IOS="armv7-apple-ios arm64-apple-ios i386-apple-ios x86_64-apple-ios"
+
+# targets for which to generate the llvm-targets file
+TARGETS="${WINDOWS_x86} ${LINUX_ARM} ${LINUX_x86} ${ANDROID} ${QNX} ${MACOS} ${IOS}"
+
+# given the call to clang -c11 that clang --target -v generates,
+# parse the -target-cpu <CPU> and -target-feature <feature> from
+# the output.
+function get_cpu_and_attr() {
+    # echo $@
+    while [ "$#" -gt 0 ]; do
+        case "$1" in
+            -target-cpu) CPU=$2; shift 2;;
+            -target-feature) ATTR+=("$2"); shift 2;;
+            *) shift 1;;
+        esac
+    done
+}
+
+# first marker to discrimiate the first line being outputted.
+FST=1
+# a dummy file to use for the clang invocation.
+FILE=_____dummy.c
+touch $FILE
+
+for target in $TARGETS; do
+    # find the cpu and attributes emitte by clang for the given $target
+    CPU=""
+    ATTR=()
+    args=$(clang --target=$target -S $FILE -o /dev/null -v 2>&1 |grep $FILE)
+    get_cpu_and_attr $args
+
+    # find the data-layout from the llvm code emitted by clang.
+    dl=$(clang --target=$target -S $FILE -emit-llvm -o -|grep datalayout |awk -F\  '{ print $4 }')
+    # GNU and Apple/LLVM can't agree on the aarch64 target.
+    # aarch64-apple-ios, is understood by autotools but not by LLVM.
+    # arm64-apple-ios, is understood by LLVM, but not by autotools.
+    #
+    # therefore, while we query clang with arm64-apple-ios, we put
+    # aarch64-apple-ios into the llvm-target list, as that is what
+    # we have to configure ghc with --target with anyway.  Also we
+    # want to retain the GNU naming for compatibility with libraries
+    # that use autotools.
+    if [ "$target" == "arm64-apple-ios" ]; then
+       target="aarch64-apple-ios"
+    fi
+    if [ $FST -eq 1 ]; then
+        echo "[(\"${target}\", ($dl, \"$CPU\", \"${ATTR[*]}\"))"
+        FST=0
+    else
+        echo ",(\"${target}\", ($dl, \"$CPU\", \"${ATTR[*]}\"))"
+    fi
+done
+rm $FILE
+echo "]"