Add in support for running a cross-shell directly in qemu (bug 807936, r=ted)

js/src/build/qemu-wrap

@@ -0,0 +1,24 @@
+#!/bin/bash
+# this script creates a wrapper shell script for an executable.  The idea is the actual executable cannot be
+# executed natively (it was cross compiled), but we want to run tests natively.  Running this script
+# as part of the compilation process will move the non-native executable to a new location, and replace it
+# with a script that will run it under qemu.
+while [[ -n $1 ]]; do
+    case $1 in
+        --qemu) QEMU="$2"; shift 2;;
+        --libdir) LIBDIR="$2"; shift 2;;
+        --ld) LD="$2"; shift 2;;
+        *) exe="$1"; shift;;
+    esac
+done
+if [[ -z $LIBDIR ]]; then
+    echo "You need to specify a directory for the cross libraries when you configure the shell"
+    echo "You can do this with --with-cross-lib="
+    exit 1
+fi
+LD=${LD:-$LIBDIR/ld-linux.so.3}
+mv $exe $exe.target
+# Just hardcode the path to the executable.  It'll be pretty obvious if it is doing the wrong thing.
+
+echo $'#!/bin/bash\n' $QEMU -E LD_LIBRARY_PATH="${LIBDIR}" "$LD" "$(readlink -f "$exe.target")" '"$@"' >"$exe"
+chmod +x $exe

js/src/configure.in

@@ -4136,6 +4136,21 @@ if test "$MOZ_DEBUG" -o "$NS_TRACE_MALLOC"; then
     MOZ_COMPONENTS_VERSION_SCRIPT_LDFLAGS=
 fi
 
+dnl ========================================================
+dnl =
+dnl = Options for generating the shell as a script
+dnl =
+dnl ========================================================
+
+MOZ_ARG_WITH_STRING(qemu-exe,
+[  --with-qemu-exe=path   Use path as an arm emulator on host platforms],
+    QEMU_EXE=$withval)
+AC_SUBST(QEMU_EXE)
+MOZ_ARG_WITH_STRING(cross-lib,
+[  --with-cross-lib=dir   Use dir as the location for arm libraries],
+    CROSS_LIB=$withval,
+    CROSS_LIB=/usr/$target)
+AC_SUBST(CROSS_LIB)
 dnl ========================================================
 dnl =
 dnl = Maintainer debug option (no --enable equivalent)

js/src/jsapi-tests/Makefile.in

@@ -85,6 +85,10 @@ LIBS      = $(DEPTH)/$(LIB_PREFIX)js_static.$(LIB_SUFFIX) $(NSPR_LIBS) $(MOZ_ZLI
 
 LOCAL_INCLUDES += -I$(topsrcdir) -I..
 
+ifdef QEMU_EXE
+MOZ_POST_PROGRAM_COMMAND = $(topsrcdir)/build/qemu-wrap --qemu $(QEMU_EXE) --libdir $(CROSS_LIB)
+endif
+
 include $(topsrcdir)/config/rules.mk
 
 check::

js/src/shell/Makefile.in

@@ -36,6 +36,10 @@ DARWIN_EXE_LDFLAGS += -pagezero_size 10000 -image_base 100000000
 endif
 endif
 
+ifdef QEMU_EXE
+MOZ_POST_PROGRAM_COMMAND = $(topsrcdir)/build/qemu-wrap --qemu $(QEMU_EXE) --libdir $(CROSS_LIB)
+endif
+
 include $(topsrcdir)/config/rules.mk
 
 ifdef MOZ_SHARK