[gnome-continuous-yocto/gnomeostree-3.28-rocko: 6660/8267] linuxloader.bbclass: add musl libc support

[Emmanuele Bassi <ebassi src gnome org>]

commit 59ec03c5bc27e167eed957ba95b9a364612903b2
Author: Ming Liu <peter x liu external atlascopco com>
Date:   Thu Jul 6 13:50:31 2017 +0200

    linuxloader.bbclass: add musl libc support
    
    Current linuxloader.bbclass does not support musl libc ldso, so add it
    in.
    
    After changing, now the linuxloader function will call a subfunction
    according to which virtual/libc is being used, glibc or musl, the
    linuxloader_musl function is made on top of the LDSO macro defined
    in musl source, by mapping related OE variables to it.
    
    Change tested on following machines:
    "genericx86"
    "genericx86-64"
    "beaglebone"
    "qemumips64"
    "qemuarm64"
    "mpc8315e-rdb"
    "edgerouter"
    "qemumips"
    "kc705-microblazeel" - meta-xilinx
    "qemuppc"
    
    (From OE-Core rev: 5d4acaed81a811912e60d85c507bee819623369e)
    
    Signed-off-by: Ming Liu <peter x liu external atlascopco com>
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/classes/linuxloader.bbclass |   42 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 41 insertions(+), 1 deletions(-)
---
diff --git a/meta/classes/linuxloader.bbclass b/meta/classes/linuxloader.bbclass
index 117b030..8f30eb3 100644
--- a/meta/classes/linuxloader.bbclass
+++ b/meta/classes/linuxloader.bbclass
@@ -1,5 +1,8 @@
+LDSO_TCLIBC = "glibc"
+LDSO_TCLIBC_libc-musl = "musl"
+LDSO_TCLIBC_libc-baremetal = "musl"
 
-linuxloader () {
+linuxloader_glibc () {
        case ${TARGET_ARCH} in
                powerpc | microblaze )
                        dynamic_loader="${base_libdir}/ld.so.1"
@@ -28,3 +31,40 @@ linuxloader () {
        esac
        echo $dynamic_loader
 }
+
+linuxloader_musl () {
+       case ${TARGET_ARCH} in
+               microblaze* )
+                       
dynamic_loader="${base_libdir}/ld-musl-microblaze${@bb.utils.contains('TUNE_FEATURES', 'bigendian', '', 'el' 
,d)}.so.1"
+                       ;;
+               mips* )
+                       
dynamic_loader="${base_libdir}/ld-musl-mips${ABIEXTENSION}${MIPSPKGSFX_BYTE}${MIPSPKGSFX_R6}${MIPSPKGSFX_ENDIAN}${@['',
 '-sf'][d.getVar('TARGET_FPU') == 'soft']}.so.1"
+                       ;;
+               powerpc )
+                       dynamic_loader="${base_libdir}/ld-musl-powerpc${@['', '-sf'][d.getVar('TARGET_FPU') 
== 'soft']}.so.1"
+                       ;;
+               powerpc64 )
+                       dynamic_loader="${base_libdir}/ld-musl-powerpc64.so.1"
+                       ;;
+               x86_64 )
+                       dynamic_loader="${base_libdir}/ld-musl-x86_64.so.1"
+                       ;;
+               i*86 )
+                       dynamic_loader="${base_libdir}/ld-musl-i386.so.1"
+                       ;;
+               arm* )
+                       dynamic_loader="${base_libdir}/ld-musl-arm${ARMPKGSFX_ENDIAN}${ARMPKGSFX_EABI}.so.1"
+                       ;;
+               aarch64* )
+                       dynamic_loader="${base_libdir}/ld-musl-aarch64${ARMPKGSFX_ENDIAN_64}.so.1"
+                       ;;
+               * )
+                       dynamic_loader="/unknown_dynamic_linker"
+                       ;;
+       esac
+       echo $dynamic_loader
+}
+
+linuxloader () {
+       linuxloader_${LDSO_TCLIBC}
+}