--- a/configure.in
+++ b/configure.in
@@ -2311,23 +2311,19 @@ ia64*-hpux*)
         CFLAGS="$CFLAGS -we4553"
         CXXFLAGS="$CXXFLAGS -we4553"
         LIBS="$LIBS kernel32.lib user32.lib gdi32.lib winmm.lib wsock32.lib advapi32.lib secur32.lib netapi32.lib"
         MOZ_DEBUG_LDFLAGS='-DEBUG -DEBUGTYPE:CV'
         WARNINGS_AS_ERRORS='-WX'
         MOZ_OPTIMIZE_FLAGS='-O1 -Oi'
         MOZ_FIX_LINK_PATHS=
         MOZ_COMPONENT_NSPR_LIBS='$(NSPR_LIBS)'
-        # Disable these flags on clang-cl since it doesn't ignore unknown arguments by default, and
-        # autoconf insists on passing $LDFLAGS to the compiler.
-        if test -z "$CLANG_CL"; then
-            LDFLAGS="$LDFLAGS -LARGEADDRESSAWARE -NXCOMPAT"
-            if test -z "$DEVELOPER_OPTIONS"; then
-                LDFLAGS="$LDFLAGS -RELEASE"
-            fi
+        LDFLAGS="$LDFLAGS -LARGEADDRESSAWARE -NXCOMPAT"
+        if test -z "$DEVELOPER_OPTIONS"; then
+            LDFLAGS="$LDFLAGS -RELEASE"
         fi
         dnl For profile-guided optimization
         PROFILE_GEN_CFLAGS="-GL"
         PROFILE_GEN_LDFLAGS="-LTCG:PGINSTRUMENT"
         dnl XXX: PGO builds can fail with warnings treated as errors,
         dnl specifically "no profile data available" appears to be
         dnl treated as an error sometimes. This might be a consequence
         dnl of using WARNINGS_AS_ERRORS in some modules, combined
@@ -2392,21 +2388,17 @@ ia64*-hpux*)
         fi
 
         if test -n "$GNU_CC"; then
             CFLAGS="$CFLAGS -mstackrealign -fno-keep-inline-dllexport"
             CXXFLAGS="$CXXFLAGS -mstackrealign -fno-keep-inline-dllexport"
             LDFLAGS="$LDFLAGS -Wl,--enable-stdcall-fixup -Wl,--large-address-aware"
         else
             DSO_LDOPTS="$DSO_LDOPTS -MACHINE:X86"
-            # Disable this flag on clang-cl since it doesn't ignore unknown arguments by default, and
-            # autoconf insists on passing $LDFLAGS to the compiler.
-            if test -z "$CLANG_CL"; then
-                LDFLAGS="$LDFLAGS -SAFESEH"
-            fi
+            LDFLAGS="$LDFLAGS -SAFESEH"
         fi
 
         AC_DEFINE(_X86_)
         ;;
     x86_64-*)
         if test -z "$HAVE_64BIT_BUILD"; then
             AC_MSG_ERROR([You are targeting 64-bit but using the 32-bit compiler.])
         fi

--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -1770,23 +1770,19 @@ ia64*-hpux*)
         # make 'foo == bar;' error out
         CFLAGS="$CFLAGS -we4553"
         CXXFLAGS="$CXXFLAGS -we4553"
         LIBS="$LIBS kernel32.lib user32.lib gdi32.lib winmm.lib wsock32.lib advapi32.lib psapi.lib"
         MOZ_DEBUG_LDFLAGS='-DEBUG -DEBUGTYPE:CV'
         WARNINGS_AS_ERRORS='-WX'
         MOZ_OPTIMIZE_FLAGS="-O2"
         MOZ_FIX_LINK_PATHS=
-        # Disable these flags on clang-cl since it doesn't ignore unknown arguments by default, and
-        # autoconf insists on passing $LDFLAGS to the compiler.
-        if test -z "$CLANG_CL"; then
-            LDFLAGS="$LDFLAGS -LARGEADDRESSAWARE -NXCOMPAT"
-            if test -z "$DEVELOPER_OPTIONS"; then
-                LDFLAGS="$LDFLAGS -RELEASE"
-            fi
+        LDFLAGS="$LDFLAGS -LARGEADDRESSAWARE -NXCOMPAT"
+        if test -z "$DEVELOPER_OPTIONS"; then
+            LDFLAGS="$LDFLAGS -RELEASE"
         fi
         dnl For profile-guided optimization
         PROFILE_GEN_CFLAGS="-GL"
         PROFILE_GEN_LDFLAGS="-LTCG:PGINSTRUMENT"
         dnl XXX: PGO builds can fail with warnings treated as errors,
         dnl specifically "no profile data available" appears to be
         dnl treated as an error sometimes. This might be a consequence
         dnl of using WARNINGS_AS_ERRORS in some modules, combined
@@ -1830,21 +1826,17 @@ ia64*-hpux*)
         fi
 
         if test -n "$GNU_CC"; then
             CFLAGS="$CFLAGS -mstackrealign -fno-keep-inline-dllexport"
             CXXFLAGS="$CXXFLAGS -mstackrealign -fno-keep-inline-dllexport"
             LDFLAGS="$LDFLAGS -Wl,--large-address-aware"
         else
             DSO_LDOPTS="$DSO_LDOPTS -MACHINE:X86"
-            # Disable this flag on clang-cl since it doesn't ignore unknown arguments by default, and
-            # autoconf insists on passing $LDFLAGS to the compiler.
-            if test -z "$CLANG_CL"; then
-                LDFLAGS="$LDFLAGS -SAFESEH"
-            fi
+            LDFLAGS="$LDFLAGS -SAFESEH"
         fi
 
     	AC_DEFINE(_X86_)
 	;;
     x86_64-*)
         if test -n "$_WIN32_MSVC"; then
             DSO_LDOPTS="$DSO_LDOPTS -MACHINE:X64"
         fi