gcc-6.3.inc: Use ucontext_t not struct ucontext.

Use ucontext_t not struct ucontext in linux-unwind.h files.

Current glibc no longer gives the ucontext_t type the tag struct
ucontext, to conform with POSIX namespace rules.  This requires
various linux-unwind.h files in libgcc, that were previously using
struct ucontext, to be fixed to use ucontext_t instead.  This is
similar to the removal of the struct siginfo tag from siginfo_t some
years ago.

Backport of patches by Joseph Myers, taken from
https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=249957

[YOCTO #12083]

(From OE-Core rev: 063f5558ef2040b6d2c34caa553ed09733fc6470)

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
(cherry picked from commit ec1c18d866c137b1fa523d0fcc29f65a28f59f44)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 140 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-6.3.inc b/meta/recipes-devtools/gcc/gcc-6.3.inc
index 71d0affb89..d74f12c466 100644
--- a/meta/recipes-devtools/gcc/gcc-6.3.inc
+++ b/meta/recipes-devtools/gcc/gcc-6.3.inc
@@ -80,6 +80,7 @@ SRC_URI = "\
            file://0047-libgcc_s-Use-alias-for-__cpu_indicator_init-instead-.patch \
            file://0048-sync-gcc-stddef.h-with-musl.patch \
            file://0054_all_nopie-all-flags.patch \
+           file://0055-unwind_h-glibc26.patch \
            ${BACKPORTS} \
 "
 BACKPORTS = "\
diff --git a/meta/recipes-devtools/gcc/gcc-6.3/0055-unwind_h-glibc26.patch b/meta/recipes-devtools/gcc/gcc-6.3/0055-unwind_h-glibc26.patch
new file mode 100644
index 0000000000..c266cfe21f
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-6.3/0055-unwind_h-glibc26.patch
@@ -0,0 +1,139 @@
+Backport and edit of patches from:
+https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=249957
+by jsm28 (Joseph Myers)
+
+Current glibc no longer gives the ucontext_t type the tag struct
+ucontext, to conform with POSIX namespace rules.  This requires
+various linux-unwind.h files in libgcc, that were previously using
+struct ucontext, to be fixed to use ucontext_t instead.  This is
+similar to the removal of the struct siginfo tag from siginfo_t some
+years ago.
+
+This patch changes those files to use ucontext_t instead.  As the
+standard name that should be unconditionally safe, so this is not
+restricted to architectures supported by glibc, or conditioned on the
+glibc version.
+
+Upstream-Status: Backport
+
+Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
+
+--- branches/gcc-6-branch/libgcc/config/aarch64/linux-unwind.h  2017/07/04 10:22:56     249956
+--- b/libgcc/config/aarch64/linux-unwind.h      2017/07/04 10:23:57     249957
+@@ -52,7 +52,7 @@
+   struct rt_sigframe
+   {
+     siginfo_t info;
+-    struct ucontext uc;
++    ucontext_t uc;
+   };
+ 
+   struct rt_sigframe *rt_;
+--- branches/gcc-6-branch/libgcc/config/alpha/linux-unwind.h    2017/07/04 10:22:56     249956
+--- b/libgcc/config/alpha/linux-unwind.h        2017/07/04 10:23:57     249957
+@@ -51,7 +51,7 @@
+     {
+       struct rt_sigframe {
+        siginfo_t info;
+-       struct ucontext uc;
++       ucontext_t uc;
+       } *rt_ = context->cfa;
+       sc = &rt_->uc.uc_mcontext;
+     }
+--- branches/gcc-6-branch/libgcc/config/bfin/linux-unwind.h     2017/07/04 10:22:56     249956
+--- b/libgcc/config/bfin/linux-unwind.h 2017/07/04 10:23:57     249957
+@@ -52,7 +52,7 @@
+        void *puc;
+        char retcode[8];
+        siginfo_t info;
+-       struct ucontext uc;
++       ucontext_t uc;
+       } *rt_ = context->cfa;
+ 
+       /* The void * cast is necessary to avoid an aliasing warning.
+--- branches/gcc-6-branch/libgcc/config/i386/linux-unwind.h     2017/07/04 10:22:56     249956
+--- b/libgcc/config/i386/linux-unwind.h 2017/07/04 10:23:57     249957
+@@ -58,7 +58,7 @@
+   if (*(unsigned char *)(pc+0) == 0x48
+       && *(unsigned long long *)(pc+1) == RT_SIGRETURN_SYSCALL)
+     {
+-      struct ucontext *uc_ = context->cfa;
++      ucontext_t *uc_ = context->cfa;
+       /* The void * cast is necessary to avoid an aliasing warning.
+          The aliasing warning is correct, but should not be a problem
+          because it does not alias anything.  */
+@@ -138,7 +138,7 @@
+        siginfo_t *pinfo;
+        void *puc;
+        siginfo_t info;
+-       struct ucontext uc;
++       ucontext_t uc;
+       } *rt_ = context->cfa;
+       /* The void * cast is necessary to avoid an aliasing warning.
+          The aliasing warning is correct, but should not be a problem
+--- branches/gcc-6-branch/libgcc/config/m68k/linux-unwind.h     2017/07/04 10:22:56     249956
+--- b/libgcc/config/m68k/linux-unwind.h 2017/07/04 10:23:57     249957
+@@ -33,7 +33,7 @@
+ /* <sys/ucontext.h> is unfortunately broken right now.  */
+ struct uw_ucontext {
+        unsigned long     uc_flags;
+-       struct ucontext  *uc_link;
++       ucontext_t       *uc_link;
+        stack_t           uc_stack;
+        mcontext_t        uc_mcontext;
+        unsigned long     uc_filler[80];
+--- branches/gcc-6-branch/libgcc/config/nios2/linux-unwind.h    2017/07/04 10:22:56     249956
+--- b/libgcc/config/nios2/linux-unwind.h        2017/07/04 10:23:57     249957
+@@ -38,7 +38,7 @@
+ 
+ struct nios2_ucontext {
+   unsigned long uc_flags;
+-  struct ucontext *uc_link;
++  ucontext_t *uc_link;
+   stack_t uc_stack;
+   struct nios2_mcontext uc_mcontext;
+   sigset_t uc_sigmask; /* mask last for extensibility */
+--- branches/gcc-6-branch/libgcc/config/pa/linux-unwind.h       2017/07/04 10:22:56     249956
+--- b/libgcc/config/pa/linux-unwind.h   2017/07/04 10:23:57     249957
+@@ -80,7 +80,7 @@
+   struct sigcontext *sc;
+   struct rt_sigframe {
+     siginfo_t info;
+-    struct ucontext uc;
++    ucontext_t uc;
+   } *frame;
+ 
+   /* rt_sigreturn trampoline:
+--- branches/gcc-6-branch/libgcc/config/sh/linux-unwind.h       2017/07/04 10:22:56     249956
+--- b/libgcc/config/sh/linux-unwind.h   2017/07/04 10:23:57     249957
+@@ -180,7 +180,7 @@
+     {
+       struct rt_sigframe {
+        siginfo_t info;
+-       struct ucontext uc;
++       ucontext_t uc;
+       } *rt_ = context->cfa;
+       /* The void * cast is necessary to avoid an aliasing warning.
+          The aliasing warning is correct, but should not be a problem
+--- branches/gcc-6-branch/libgcc/config/tilepro/linux-unwind.h  2017/07/04 10:22:56     249956
+--- b/libgcc/config/tilepro/linux-unwind.h      2017/07/04 10:23:57     249957
+@@ -61,7 +61,7 @@
+   struct rt_sigframe {
+     unsigned char save_area[C_ABI_SAVE_AREA_SIZE];
+     siginfo_t info;
+-    struct ucontext uc;
++    ucontext_t uc;
+   } *rt_;
+ 
+   /* Return if this is not a signal handler.  */
+--- branches/gcc-6-branch/libgcc/config/xtensa/linux-unwind.h   2017/07/04 10:22:56     249956
+--- b/libgcc/config/xtensa/linux-unwind.h       2017/07/04 10:23:57     249957
+@@ -67,7 +67,7 @@
+ 
+   struct rt_sigframe {
+     siginfo_t info;
+-    struct ucontext uc;
++    ucontext_t uc;
+   } *rt_;
+ 
+   /* movi a2, __NR_rt_sigreturn; syscall */