RE: [Patch] MIPS configuration patch to enable --with-[arch,endian,abi]

[Steve Ellcey <sellcey at imgtec dot com>]

On Fri, 2014-10-31 at 15:12 -0700, Matthew Fortune wrote:

> I'm not keen on adding support for --with-endian to mips. I believe that
> various build systems have become quite dependent on 'mips' meaning big
> endian and 'mipsel' being little endian. I'd prefer to remove that part
> unless you (or anyone else) can identify a reason why we should support
> it.

OK, I will remove the --with-endian part of the patch, that will also
take care of the issues Joseph had with the patch.

> This is OK if --with-endian support is removed, otherwise if you see a
> need for it then I'd like to see what Catherine thinks.
> 
> Thanks,
> Matthew

Here is the patch with the endian support removed, I will go ahead and
check it in.

2014-11-06  Steve Ellcey  <sellcey@imgtec.com>

	* config.gcc (mips*-mti-linux*): Remove gnu_ld and gas assignments.
	Set default_mips_arch and default_mips_abi instead of tm_defines.
	(mips*-*-linux*): Set default_mips_arch and default_mips_abi instead
	of tm_defines.
	(mips*-*-*): Check with_arch and with_abi.  Set tm_defines.
	* config/mips/mips.h (STANDARD_STARTFILE_PREFIX_1): Set default
	based on MIPS_ABI_DEFAULT.
	(STANDARD_STARTFILE_PREFIX_2): Ditto.


diff --git a/gcc/config.gcc b/gcc/config.gcc
index 10b0a6e..f1bfb65 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1952,30 +1952,30 @@ mips*-*-linux*)				# Linux MIPS, either endian.
 	extra_options="${extra_options} linux-android.opt"
 	case ${target} in
 		mipsisa32r2*)
-			tm_defines="${tm_defines} MIPS_ISA_DEFAULT=33"
+			default_mips_arch=mips32r2
 			;;
 		mipsisa32*)
-			tm_defines="${tm_defines} MIPS_ISA_DEFAULT=32"
+			default_mips_arch=mips32
 			;;
 		mips64el-st-linux-gnu)
-			tm_defines="${tm_defines} MIPS_ABI_DEFAULT=ABI_N32"
+			default_mips_abi=n32
 			tm_file="${tm_file} mips/st.h"
 			tmake_file="${tmake_file} mips/t-st"
 			enable_mips_multilibs="yes"
 			;;
 		mips64octeon*-*-linux*)
-			tm_defines="${tm_defines} MIPS_ABI_DEFAULT=ABI_N32"
+			default_mips_abi=n32
 			tm_defines="${tm_defines} MIPS_CPU_STRING_DEFAULT=\\\"octeon\\\""
 			target_cpu_default=MASK_SOFT_FLOAT_ABI
 			enable_mips_multilibs="yes"
 			;;
 		mipsisa64r2*-*-linux*)
-			tm_defines="${tm_defines} MIPS_ABI_DEFAULT=ABI_N32"
-			tm_defines="${tm_defines} MIPS_ISA_DEFAULT=65"
+			default_mips_abi=n32
+			default_mips_arch=mips64r2
 			enable_mips_multilibs="yes"
 			;;
 		mips64*-*-linux* | mipsisa64*-*-linux*)
-			tm_defines="${tm_defines} MIPS_ABI_DEFAULT=ABI_N32"
+			default_mips_abi=n32
 			enable_mips_multilibs="yes"
 			;;
 	esac
@@ -4120,6 +4120,29 @@ case ${target} in
 				tm_defines="TARGET_ENDIAN_DEFAULT=0 $tm_defines"
 				;;
 		esac
+		if test x$with_arch != x; then
+			default_mips_arch=$with_arch
+		fi
+		if test x$with_abi != x; then
+			default_mips_abi=$with_abi
+		fi
+		case ${default_mips_arch} in
+		    mips1)    tm_defines="$tm_defines MIPS_ISA_DEFAULT=1" ;;
+		    mips2)    tm_defines="$tm_defines MIPS_ISA_DEFAULT=2" ;;
+		    mips3)    tm_defines="$tm_defines MIPS_ISA_DEFAULT=3" ;;
+		    mips4)    tm_defines="$tm_defines MIPS_ISA_DEFAULT=4" ;;
+		    mips32)   tm_defines="$tm_defines MIPS_ISA_DEFAULT=32" ;;
+		    mips32r2) tm_defines="$tm_defines MIPS_ISA_DEFAULT=33" ;;
+		    mips64)   tm_defines="$tm_defines MIPS_ISA_DEFAULT=64" ;;
+		    mips64r2) tm_defines="$tm_defines MIPS_ISA_DEFAULT=65" ;;
+		esac
+		case ${default_mips_abi} in
+		    32)   tm_defines="$tm_defines MIPS_ABI_DEFAULT=ABI_32" ;;
+		    o64)  tm_defines="$tm_defines MIPS_ABI_DEFAULT=ABI_O64" ;;
+		    n32)  tm_defines="$tm_defines MIPS_ABI_DEFAULT=ABI_N32" ;;
+		    64)   tm_defines="$tm_defines MIPS_ABI_DEFAULT=ABI_64" ;;
+		    eabi) tm_defines="$tm_defines MIPS_ABI_DEFAULT=ABI_EABI" ;;
+		esac
 		tmake_file="mips/t-mips $tmake_file"
 		;;
 
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index c7b998b..3b8469f 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -3009,3 +3009,13 @@ extern GTY(()) struct target_globals *mips16_globals;
    with arguments ARGS.  */
 #define PMODE_INSN(NAME, ARGS) \
   (Pmode == SImode ? NAME ## _si ARGS : NAME ## _di ARGS)
+
+/* If we are *not* using multilibs and the default ABI is not ABI_32 we
+   need to change these from /lib and /usr/lib.  */
+#if MIPS_ABI_DEFAULT == ABI_N32
+#define STANDARD_STARTFILE_PREFIX_1 "/lib32/"
+#define STANDARD_STARTFILE_PREFIX_2 "/usr/lib32/"
+#elif MIPS_ABI_DEFAULT == ABI_64
+#define STANDARD_STARTFILE_PREFIX_1 "/lib64/"
+#define STANDARD_STARTFILE_PREFIX_2 "/usr/lib64/"
+#endif