conf/machine: use .= instead of += in TUNE_CCARGS

* number of TUNE_CCARGS conditionals is important if we add
  extra space with each one in "else" branch

  I'm building for 2 MACHINEs one is cortexa9, second is cortexa8

  few months ago we added TUNE_CCARGS[vardepvalue] in bitbake.conf
  http://git.openembedded.org/openembedded-core/commit/?id=03f1e34ea3ce80931e9c3cd2ab22824f28a7233b

  which fixed some cases (like mentioned tune-xscale and tune-arm926ejs)
  where both had unused TUNE_CCARGS when common DEFAULTTUNE was used.

  with cortexa[89] it's different, because cortexa9 has one extra TUNE_CCARGS
  TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "cortexa9", "-mtune=cortex-a9", "", d)}"
  which adds extra *space* even when not used because of '+=' and as result:

  $ bitbake-diffsigs tmp-eglibc/sstate-diff/1366797730/*/armv7*/adapterbase/*do_configure*
  basehash changed from f986789fb8fb3579ed6a3492cc8a8d10 to c851b5f838d945ee13072e9ad6725dca
  Variable TUNE_CCARGS value changed from
  ' -march=armv7-a     -mthumb-interwork -mfloat-abi=softfp -mfpu=neon '
  to
  ' -march=armv7-a     -mthumb-interwork -mfloat-abi=softfp -mfpu=neon  '
  Hash for dependent task gcc-runtime_4.7.bb.do_populate_sysroot changed from bdeabf7a86958b9110b566344b7916de to 2be5618e6bc8c57ec9db5659bf217915
  Hash for dependent task eglibc_2.17.bb.do_populate_sysroot changed from b4f40fc62dde684acd0a574532a55360 to 97fcb426603d4a1c1099c0504d2ebf7d
  Hash for dependent task glib-2.0_2.34.3.bb.do_populate_sysroot changed from fd2f90b83098c34e88d649d70f6ea4f5 to ebd740bb94ea3eb0a914efda6fc82c4a

(From OE-Core rev: b7430ff83760ac29079d20dc7c62f498a0a9d55d)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/conf/machine/include/powerpc/arch-powerpc64.inc b/meta/conf/machine/include/powerpc/arch-powerpc64.inc
index f9e2b2a4c4..8476dec8a0 100644
--- a/meta/conf/machine/include/powerpc/arch-powerpc64.inc
+++ b/meta/conf/machine/include/powerpc/arch-powerpc64.inc
@@ -4,7 +4,7 @@ require conf/machine/include/powerpc/arch-powerpc.inc
 
 TUNEVALID[m64] = "Power ELF64 standard ABI"
 TUNECONFLICTS[m64] = "m32 nf"
-TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "m64", "-m64", "", d)}"
+TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "m64", " -m64", "", d)}"
 TUNE_ARCH .= "${@bb.utils.contains("TUNE_FEATURES", [ "m64" ], "powerpc64", "", d)}"
 
 AVAILTUNES += "powerpc64"