[oe-commits] [openembedded-core] 07/09: gcc: Select proper ARC CPU when build for target

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rpurdie pushed a commit to branch master-next
in repository openembedded-core.

commit 6d2e44db7ebada41ad1cfc1c98ce9012242ced11
Author: Alexey Brodkin <alexey.brodkin at synopsys.com>
AuthorDate: Thu Nov 22 15:06:00 2018 +0300

    gcc: Select proper ARC CPU when build for target
    
    By default GCC for ARC is configured with ARC700 CPU.
    This means when we don't pass "-mcpu=xxx":
     a) Code will be compiled for ARC700
     b) Libs will used for ARC700
    
    And if we happen to run on ARCv2 core like ARC HSxx we
    won't be able to use target gcc w/o "-mcpu=xxx" which
    is not very convenient as we want to build "target" toolchain
    but not canadian-cross.
    
    Note the trick here is we set TUNE_PKGARCH in just 2 values,
    it is either "arc700" for all ARCompact cores (ARC750 & ARC770)
    and "archs" for all ARCv2 cores (ARC HS38 & HS48), see [1].
    This gives us usable defaults.
    
    For cross-compilation we use TUNE_CCARGS for fine-tuning depending
    on which HW features we have on the current target so that
    we may have HW feature A & B or B & C or A & B & C, see [2].
    
    [1] https://github.com/foss-for-synopsys-dwc-arc-processors/meta-synopsys/blob/master/conf/machine/include/tune-arcv2.inc#L4
    [2] https://github.com/foss-for-synopsys-dwc-arc-processors/meta-synopsys/blob/master/conf/machine/include/tune-arcv2.inc#L34
    
    Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
    Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
 meta/recipes-devtools/gcc/gcc-target.inc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/meta/recipes-devtools/gcc/gcc-target.inc b/meta/recipes-devtools/gcc/gcc-target.inc
index bc2236f..6270059 100644
--- a/meta/recipes-devtools/gcc/gcc-target.inc
+++ b/meta/recipes-devtools/gcc/gcc-target.inc
@@ -20,6 +20,7 @@ ARMFPARCHEXT ?= ""
 EXTRA_OECONF_append_armv6 = " --with-arch=armv6${ARMFPARCHEXT}"
 EXTRA_OECONF_append_armv7a = " --with-arch=armv7-a${ARMFPARCHEXT}"
 EXTRA_OECONF_append_armv7ve = " --with-arch=armv7ve${ARMFPARCHEXT}"
+EXTRA_OECONF_append_arc = " --with-cpu=${TUNE_PKGARCH}"
 
 # libcc1 requres gcc_cv_objdump when cross build, but gcc_cv_objdump is
 # set in subdir gcc, so subdir libcc1 can't use it, export it here to

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