1 files changed, 47 insertions, 0 deletions
diff --git a/scripts/build/arch/x86.sh b/scripts/build/arch/x86.sh
index 69407db9..ca0f08bf 100644
--- a/scripts/build/arch/x86.sh
+++ b/scripts/build/arch/x86.sh
@@ -20,4 +20,51 @@ CT_DoArchTupleValues() {
         esac
     fi
     CT_TARGET_ARCH="${CT_TARGET_ARCH}${CT_ARCH_SUFFIX}"
+
+    # Shouldn't be possible to specify this (CT_TARGET_SYS is not specified by the user,
+    # it is computed by scripts/functions from libc choices). But trap if such invalid
+    # values ever come from the caller:
+    case "${CT_TARGET_ARCH}-${CT_TARGET_SYS}" in
+        i[34567]86-gnux32)
+            CT_DoLog ERROR "Invalid CT_TARGET: i[34567]86-<vendor>-<os>-gnux32 is invalid."
+            CT_DoLog ERROR "CT_TARGET: ${CT_TARGET}"
+            CT_Abort "Go read: https://wiki.debian.org/Multiarch/Tuples"
+            ;;
+    esac
+}
+
+#------------------------------------------------------------------------------
+# Get multilib architecture-specific target
+# Usage: CT_DoArchMultilibTarget "multilib flags" "target tuple"
+CT_DoArchMultilibTarget ()
+{
+    local target="${1}"; shift
+    local -a multi_flags=( "$@" )
+
+    local bit32=false
+    local bit64=false
+    local abi_dflt=false
+    local abi_x32=false
+
+    for m in "${multi_flags[@]}"; do
+        case "$m" in
+            -m32)  bit32=true; abi_dflt=true;;
+            -m64)  bit64=true; abi_dflt=true;;
+            -mx32) bit64=true; abi_x32=true;;
+        esac
+    done
+
+    # Fix up architecture.
+    case "${target}" in
+        x86_64-*)      $bit32 && target=${target/#x86_64-/i386-} ;;
+        i[34567]86-*)  $bit64 && target=${target/#i[34567]86-/x86_64-} ;;
+    esac
+
+    # Fix up the ABI part.
+    case "${target}" in
+        *x32) $abi_dflt && target=${target/%x32} ;;
+        *)    $abi_x32  && target=${target}x32 ;;
+    esac
+
+    echo "${target}"
 }