New x86 toolchain: x86_64-linux-android-4.7

This toolchain can generates x86, x32, and x86_64 (default) code.
Android build system already adds "-m32" to HOST_GLOBAL_CFLAGS
and HOST_GLOBAL_LDFLAGS for projects to compiled in x86.

Build instructions:

export AOSP=your-AOSP-path
export NDK=$AOSP/ndk
cd $NDK ; ./build/tools/dev-cleanup.sh
./build/tools/download-toolchain-sources.sh /tmp/ndk-$USER/src
./build/tools/gen-platforms.sh --minimal --dst-dir=$NDK --ndk-dir=$NDK --arch=x86_64
./build/tools/build-gcc.sh /tmp/ndk-$USER/src $NDK x86_64-4.7 --try-64
rm -rf $NDK/toolchains/x86_64-4.7/prebuilt/linux-x86_64/sysroot
cp -a $NDK/toolchains/x86_64-4.7/prebuilt/linux-x86_64/* \
  $AOSP/prebuilts/gcc/linux-x86_64/x86/x86_64-linux-android-4.7

Change-Id: Iddb5246ff74c39feea79539e4471d5ddc15afe5c

1 files changed, 38 insertions, 0 deletions

diff --git a/x86_64-linux-android/lib/ldscripts/i386linux.xu b/x86_64-linux-android/lib/ldscripts/i386linux.xu
new file mode 100644
index 0000000..6847100
--- /dev/null
+++ b/x86_64-linux-android/lib/ldscripts/i386linux.xu
@@ -0,0 +1,38 @@
+/* Script for ld -Ur: link w/out relocation, do create constructors */
+OUTPUT_FORMAT("a.out-i386-linux", "a.out-i386-linux",
+	      "a.out-i386-linux")
+OUTPUT_ARCH(i386)
+SECTIONS
+{
+  .text :
+  {
+    CREATE_OBJECT_SYMBOLS
+    *(.text)
+    /* The next six sections are for SunOS dynamic linking.  The order
+       is important.  */
+    *(.dynrel)
+    *(.hash)
+    *(.dynsym)
+    *(.dynstr)
+    *(.rules)
+    *(.need)
+  }
+  .data :
+  {
+    /* The first three sections are for SunOS dynamic linking.  */
+    *(.dynamic)
+    *(.got)
+    *(.plt)
+    *(.data)
+    *(.linux-dynamic) /* For Linux dynamic linking.  */
+    CONSTRUCTORS
+  }
+  .bss :
+  {
+   ;
+   *(.bss)
+   *(COMMON)
+   ;
+   ;
+  }
+}