Fix issues when using security_flags on musl

security_flags enabled builds revealed several issues when building on musl especially compiling gcc runtime libs we should not use fstack-protector another change is to replace with -fstack-protector-all with -fstack-protector-strong which is available since 4.9 and has best of both worlds (stack size usage and security) gcc on musl/ppc was missing patches as a result images werent booting on qemuppc that is fixed too. It also revealed some more issues in compiling gcc for musl systems was not getting all configs right.
Addressed the review comments on nss-myhostname

Changes since v1:
Ignore security flags for non target packages

The following changes since commit 1b2e1eb6f08b6f95cf555d7f6bc6e4de2113aaed:

libical: Work around hardcoded paths in pkgconfig file (2016-02-04 13:09:51 +0000)

are available in the git repository at:

git://git.openembedded.org/openembedded-core-contrib kraj/pu
http://cgit.openembedded.org/cgit.cgi/openembedded-core-contrib/log/?h=kraj/pu

Khem Raj (6):
nss-myhostname: Fix build on musl
gcc: Fix build on musl with -fstack-protector
security_flags: Disable fstack-protector for gcc runtime libs
security_flags: Replace -fstack-protector-all with
-fstack-protector-strong
gcc: Assume libssp and dl_iterate_phdr on musl
gcc: musl related fixes for unwinding,ppc/secure-plt and gthr

 meta/conf/distro/include/security_flags.inc        | 23 ++++---
 meta/recipes-devtools/gcc/gcc-5.3.inc              |  7 +-
 .../gcc/gcc-5.3/0047-Fix-nios2-musl-build.patch    | 11 ---
 .../0047-nios2-Define-MUSL_DYNAMIC_LINKER.patch    | 28 ++++++++
 .../gcc/gcc-5.3/0048-ssp_nonshared.patch           | 29 ++++++++
 ...-weak-reference-logic-in-gthr.h-for-os-ge.patch | 78 ++++++++++++++++++++++
 ...050-powerpc-pass-secure-plt-to-the-linker.patch | 66 ++++++++++++++++++
 .../gcc-5.3/0051-support-unwinding-on-musl.patch   | 34 ++++++++++
 ...tname-Check-for-nss.h-presense-before-use.patch | 53 +++++++++++++++
 .../nss-myhostname/nss-myhostname_0.3.bb           |  4 +-
 10 files changed, 311 insertions(+), 22 deletions(-)
 delete mode 100644 meta/recipes-devtools/gcc/gcc-5.3/0047-Fix-nios2-musl-build.patch
 create mode 100644 meta/recipes-devtools/gcc/gcc-5.3/0047-nios2-Define-MUSL_DYNAMIC_LINKER.patch
 create mode 100644 meta/recipes-devtools/gcc/gcc-5.3/0048-ssp_nonshared.patch
 create mode 100644 meta/recipes-devtools/gcc/gcc-5.3/0049-Disable-the-weak-reference-logic-in-gthr.h-for-os-ge.patch
 create mode 100644 meta/recipes-devtools/gcc/gcc-5.3/0050-powerpc-pass-secure-plt-to-the-linker.patch
 create mode 100644 meta/recipes-devtools/gcc/gcc-5.3/0051-support-unwinding-on-musl.patch
 create mode 100644 meta/recipes-support/nss-myhostname/nss-myhostname/0001-nss-myhostname-Check-for-nss.h-presense-before-use.patch

2.7.0