Pass $HOST to individual script with a --host parameter

This avoids ambiguity on distributions (such as openSUSE) where the
HOST environment variable already is set, to the hostname.

Dockerfile.cross

@@ -25,18 +25,18 @@ ENV HOST=$CROSS_ARCH-w64-mingw32
 ARG FULL_LLVM
 
 COPY build-llvm.sh .
-RUN ./build-llvm.sh $CROSS_TOOLCHAIN_PREFIX
+RUN ./build-llvm.sh $CROSS_TOOLCHAIN_PREFIX --host=$HOST
 COPY strip-llvm.sh .
 RUN ./strip-llvm.sh $CROSS_TOOLCHAIN_PREFIX
 
 ARG TOOLCHAIN_ARCHS="i686 x86_64 armv7 aarch64"
 
 COPY build-mingw-w64.sh ./
-RUN ./build-mingw-w64.sh $CROSS_TOOLCHAIN_PREFIX --skip-include-triplet-prefix
+RUN ./build-mingw-w64.sh $CROSS_TOOLCHAIN_PREFIX --skip-include-triplet-prefix --host=$HOST
 
 COPY wrappers/*.sh wrappers/*.c wrappers/*.h ./wrappers/
 COPY install-wrappers.sh .
-RUN ./install-wrappers.sh $CROSS_TOOLCHAIN_PREFIX
+RUN ./install-wrappers.sh $CROSS_TOOLCHAIN_PREFIX --host=$HOST
 
 COPY prepare-cross-toolchain.sh .
 RUN ./prepare-cross-toolchain.sh $TOOLCHAIN_PREFIX $CROSS_TOOLCHAIN_PREFIX $CROSS_ARCH

build-cross-tools.sh

@@ -12,10 +12,10 @@ CROSS_ARCH="$3"
 
 export PATH=$NATIVE/bin:$PATH
 export EXEEXT=.exe
-export HOST=$CROSS_ARCH-w64-mingw32
+HOST=$CROSS_ARCH-w64-mingw32
 
-./build-llvm.sh $PREFIX
+./build-llvm.sh $PREFIX --host=$HOST
 ./strip-llvm.sh $PREFIX
-./build-mingw-w64.sh $PREFIX --skip-include-triplet-prefix
-./install-wrappers.sh $PREFIX
+./build-mingw-w64.sh $PREFIX --skip-include-triplet-prefix --host=$HOST
+./install-wrappers.sh $PREFIX --host=$HOST
 ./prepare-cross-toolchain.sh $NATIVE $PREFIX $CROSS_ARCH

build-llvm.sh

@@ -4,19 +4,28 @@ set -e
 
 ASSERTS=OFF
 BUILDDIR=build
+unset HOST
 
 while [ $# -gt 0 ]; do
-    if [ "$1" = "--disable-asserts" ]; then
+    case "$1" in
+    --disable-asserts)
         ASSERTS=OFF
         BUILDDIR=build
-    elif [ "$1" = "--enable-asserts" ]; then
+        ;;
+    --enable-asserts)
         ASSERTS=ON
         BUILDDIR=build-asserts
-    elif [ "$1" = "--full-llvm" ]; then
+        ;;
+    --full-llvm)
         FULL_LLVM=1
-    else
+        ;;
+    --host=*)
+        HOST="${1#*=}"
+        ;;
+    *)
         PREFIX="$1"
-    fi
+        ;;
+    esac
     shift
 done
 if [ -z "$CHECKOUT_ONLY" ]; then

build-mingw-w64.sh

@@ -4,6 +4,7 @@ set -e
 
 DEFAULT_WIN32_WINNT=0x600
 DEFAULT_MSVCRT=ucrt
+unset HOST
 
 while [ $# -gt 0 ]; do
     case "$1" in
@@ -16,6 +17,9 @@ while [ $# -gt 0 ]; do
     --with-default-msvcrt=*)
         DEFAULT_MSVCRT="${1#*=}"
         ;;
+    --host=*)
+        HOST="${1#*=}"
+        ;;
     *)
         PREFIX="$1"
         ;;

install-wrappers.sh

@@ -2,11 +2,23 @@
 
 set -e
 
-if [ $# -lt 1 ]; then
+unset HOST
+
+while [ $# -gt 0 ]; do
+    case "$1" in
+    --host=*)
+        HOST="${1#*=}"
+        ;;
+    *)
+        PREFIX="$1"
+        ;;
+    esac
+    shift
+done
+if [ -z "$PREFIX" ]; then
     echo $0 dest
     exit 1
 fi
-PREFIX="$1"
 mkdir -p "$PREFIX"
 PREFIX="$(cd "$PREFIX" && pwd)"