From d2abe7328cea770425405aa0da2f4c2dac89fcad Mon Sep 17 00:00:00 2001
From: Matthias Schoepfer <matthias.schoepfer@ithinx.io>
Date: Fri, 31 May 2019 15:34:34 +0200
Subject: [PATCH] bpo-36852: proper detection of mips architecture for soft

 float

When (cross) compiling for softfloat mips, __mips_hard_float will not be
defined and detection of OS triplet in configure.ac / configure will fail.

This also has to do with the custom detection of the build triplet. Trying
to do this in a more autoconf/autotools manner.

Upstream-Status: Submitted [https://github.com/python/cpython/pull/13196]
Signed-off-by: Matthias Schoepfer <matthias.schoepfer@ithinx.io>

---
 configure.ac | 196 ++++++---------------------------------------------
 1 file changed, 21 insertions(+), 175 deletions(-)

diff --git a/configure.ac b/configure.ac
index 358b6ea..085fc0b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -907,181 +907,27 @@ then
 fi
 
 
-AC_MSG_CHECKING([for the platform triplet based on compiler characteristics])
-cat > conftest.c <<EOF
-#undef bfin
-#undef cris
-#undef fr30
-#undef linux
-#undef hppa
-#undef hpux
-#undef i386
-#undef mips
-#undef powerpc
-#undef sparc
-#undef unix
-#if defined(__ANDROID__)
-    # Android is not a multiarch system.
-#elif defined(__linux__)
-# if defined(__x86_64__) && defined(__LP64__)
-        x86_64-linux-gnu
-# elif defined(__x86_64__) && defined(__ILP32__)
-        x86_64-linux-gnux32
-# elif defined(__i386__)
-        i386-linux-gnu
-# elif defined(__aarch64__) && defined(__AARCH64EL__)
-#  if defined(__ILP32__)
-        aarch64_ilp32-linux-gnu
-#  else
-        aarch64-linux-gnu
-#  endif
-# elif defined(__aarch64__) && defined(__AARCH64EB__)
-#  if defined(__ILP32__)
-        aarch64_be_ilp32-linux-gnu
-#  else
-        aarch64_be-linux-gnu
-#  endif
-# elif defined(__alpha__)
-        alpha-linux-gnu
-# elif defined(__ARM_EABI__) && defined(__ARM_PCS_VFP)
-#  if defined(__ARMEL__)
-        arm-linux-gnueabihf
-#  else
-        armeb-linux-gnueabihf
-#  endif
-# elif defined(__ARM_EABI__) && !defined(__ARM_PCS_VFP)
-#  if defined(__ARMEL__)
-        arm-linux-gnueabi
-#  else
-        armeb-linux-gnueabi
-#  endif
-# elif defined(__hppa__)
-        hppa-linux-gnu
-# elif defined(__ia64__)
-        ia64-linux-gnu
-# elif defined(__m68k__) && !defined(__mcoldfire__)
-        m68k-linux-gnu
-# elif defined(__mips_hard_float) && defined(__mips_isa_rev) && (__mips_isa_rev >=6) && defined(_MIPSEL)
-#  if _MIPS_SIM == _ABIO32
-        mipsisa32r6el-linux-gnu
-#  elif _MIPS_SIM == _ABIN32
-        mipsisa64r6el-linux-gnuabin32
-#  elif _MIPS_SIM == _ABI64
-        mipsisa64r6el-linux-gnuabi64
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__mips_hard_float) && defined(__mips_isa_rev) && (__mips_isa_rev >=6)
-#  if _MIPS_SIM == _ABIO32
-        mipsisa32r6-linux-gnu
-#  elif _MIPS_SIM == _ABIN32
-        mipsisa64r6-linux-gnuabin32
-#  elif _MIPS_SIM == _ABI64
-        mipsisa64r6-linux-gnuabi64
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__mips_hard_float) && defined(_MIPSEL)
-#  if _MIPS_SIM == _ABIO32
-        mipsel-linux-gnu
-#  elif _MIPS_SIM == _ABIN32
-        mips64el-linux-gnuabin32
-#  elif _MIPS_SIM == _ABI64
-        mips64el-linux-gnuabi64
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__mips_hard_float)
-#  if _MIPS_SIM == _ABIO32
-        mips-linux-gnu
-#  elif _MIPS_SIM == _ABIN32
-        mips64-linux-gnuabin32
-#  elif _MIPS_SIM == _ABI64
-        mips64-linux-gnuabi64
-#  else
-#   error unknown platform triplet
-#  endif
-# elif defined(__or1k__)
-        or1k-linux-gnu
-# elif defined(__powerpc__) && defined(__SPE__)
-        powerpc-linux-gnuspe
-# elif defined(__powerpc64__)
-#  if defined(__LITTLE_ENDIAN__)
-        powerpc64le-linux-gnu
-#  else
-        powerpc64-linux-gnu
-#  endif
-# elif defined(__powerpc__)
-        powerpc-linux-gnu
-# elif defined(__s390x__)
-        s390x-linux-gnu
-# elif defined(__s390__)
-        s390-linux-gnu
-# elif defined(__sh__) && defined(__LITTLE_ENDIAN__)
-        sh4-linux-gnu
-# elif defined(__sparc__) && defined(__arch64__)
-        sparc64-linux-gnu
-# elif defined(__sparc__)
-        sparc-linux-gnu
-# elif defined(__riscv)
-#  if __riscv_xlen == 32
-        riscv32-linux-gnu
-#  elif __riscv_xlen == 64
-        riscv64-linux-gnu
-#  else
-#   error unknown platform triplet
-#  endif
-# else
-#   error unknown platform triplet
-# endif
-#elif defined(__FreeBSD_kernel__)
-# if defined(__LP64__)
-        x86_64-kfreebsd-gnu
-# elif defined(__i386__)
-        i386-kfreebsd-gnu
-# else
-#   error unknown platform triplet
-# endif
-#elif defined(__gnu_hurd__)
-        i386-gnu
-#elif defined(__APPLE__)
-        darwin
-#elif defined(__VXWORKS__)
-        vxworks
-#elif defined(__wasm32__)
-#  if defined(__EMSCRIPTEN__)
-	wasm32-emscripten
-#  elif defined(__wasi__)
-	wasm32-wasi
-#  else
-#    error unknown wasm32 platform
-#  endif
-#elif defined(__wasm64__)
-#  if defined(__EMSCRIPTEN)
-	wasm64-emscripten
-#  elif defined(__wasi__)
-	wasm64-wasi
-#  else
-#    error unknown wasm64 platform
-#  endif
-#else
-# error unknown platform triplet
-#endif
-
-EOF
-
-if $CPP $CPPFLAGS conftest.c >conftest.out 2>/dev/null; then
-  PLATFORM_TRIPLET=`grep -v '^#' conftest.out | grep -v '^ *$' | tr -d ' 	'`
-  case "$build_os" in
-  linux-musl*)
-    PLATFORM_TRIPLET=`echo "$PLATFORM_TRIPLET" | sed 's/linux-gnu/linux-musl/'`
-    ;;
-  esac
-  AC_MSG_RESULT([$PLATFORM_TRIPLET])
-else
-  AC_MSG_RESULT([none])
-fi
-rm -f conftest.c conftest.out
+AC_CANONICAL_TARGET
+## Not using $target to filter out vendor
+## Need to handle macos, vxworks and hurd special (?) :-/
+case ${target_os} in
+     darwin*)
+     	PLATFORM_TRIPLET=darwin
+	;;
+     hurd*)
+     	PLATFORM_TRIPLET=i386-gnu
+	;;
+     vxworks*)
+     	PLATFORM_TRIPLET=vxworks
+	;;
+     *)
+        if test "${target_cpu}" != "i686"; then
+		PLATFORM_TRIPLET=${target_cpu}-${target_os}
+	else
+		PLATFORM_TRIPLET=i386-${target_os}
+	fi
+	;;
+esac	
 
 AC_MSG_CHECKING([for multiarch])
 AS_CASE([$ac_sys_system],