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configure: Add an armv7-win32-gcc target

This builds for windows on arm, with llvm-mingw. The target triplet
is named -gcc since that's how similar existing targets are named,
even though it technically runs clang (via frontends named
"$CROSS-gcc").

Assemble using $CC -c since there's no standalone assembler
available (except perhaps llvm-mc).

Change-Id: I2c9a319730afef73f811bad79f488dcdc244ab0d

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -941,7 +941,6 @@

           setup_gnu_toolchain

           arch_int=${tgt_isa##armv}

           arch_int=${arch_int%%te}

-          check_add_asflags --defsym ARCHITECTURE=${arch_int}

           tune_cflags="-mtune="

           if [ ${tgt_isa} = "armv7" ] || [ ${tgt_isa} = "armv7s" ]; then

             if [ -z "${float_abi}" ]; then

@@ -968,6 +967,19 @@

           enabled debug && add_asflags -g

           asm_conversion_cmd="${source_path}/build/make/ads2gas.pl"

+

+          case ${tgt_os} in

+            win*)

+              asm_conversion_cmd="$asm_conversion_cmd -noelf"

+              AS="$CC -c"

+              EXE_SFX=.exe

+              enable_feature thumb

+              ;;

+            *)

+              check_add_asflags --defsym ARCHITECTURE=${arch_int}

+              ;;

+          esac

+

           if enabled thumb; then

             asm_conversion_cmd="$asm_conversion_cmd -thumb"

             check_add_cflags -mthumb

--- a/configure

+++ b/configure

@@ -106,6 +106,7 @@

 all_platforms="${all_platforms} armv7-linux-rvct"    #neon Cortex-A8

 all_platforms="${all_platforms} armv7-linux-gcc"     #neon Cortex-A8

 all_platforms="${all_platforms} armv7-none-rvct"     #neon Cortex-A8

+all_platforms="${all_platforms} armv7-win32-gcc"

 all_platforms="${all_platforms} armv7-win32-vs11"

 all_platforms="${all_platforms} armv7-win32-vs12"

 all_platforms="${all_platforms} armv7-win32-vs14"