Welcome to the GCC 6.1 release, the first release of the GCC 6 series.

The default mode for C++ is now -std=gnu++14 instead of -std=gnu++98.

Type-based alias analysis now disambiguates accesses to different pointers.
This improves precision of the alias oracle by about 20-30% on higher-level
C++ programs. Programs doing invalid type punning of pointer types may now
need -fno-strict-aliasing to work correctly.

Value range propagation now assumes that the this pointer of C++ member
functions is non-null. This eliminates common null pointer checks but also
breaks some non-conforming code-bases (such as Qt-5, Chromium, KDevelop).
As a temporary work-around -fno-delete-null-pointer-checks can be used.
Wrong code can be identified by using -fsanitize=undefined.

There have been significant improvements around link-time optimization
and inter-procedural optimization and some support for OpenACC (though
probably not tested on FreeBSD) and version 4.5 of the OpenMP specification.

Source locations for the C and C++ compilers are now tracked as ranges
and diagnostics can now contain "fix-it hints".

New command-line options include -Wshift-negative-value, -Wshift-overflow,
-Wtautological-compare, -Wnull-dereference, -Wduplicated-cond, and
-Wmisleading-indentation.

C++ Concepts are now supported when compiling with -fconcepts, and there
are several other improvements around support for newer C++ features as
well as in the libstdc++ library.

Fortran now features Fortran 2008 SUBMODULE support, Fortran 2015 EVENT_TYPE,
EVENT_POST, EVENT_WAIT, and EVENT_QUERY support, and improved support for
OpenMP and OpenACC.

A lot has happened on the AArch64 and ARM fronts, on x86-64 there is now
Skylake with AVX-512 support, AMD instructions monitorx and mwaitx, and
support for address spaces __seg_fs, __seg_gs, and __seg_tl, as well as
AMD Zen (family 17h) processors, and basic support has been added for POWER9.

https://gcc.gnu.org/gcc-6/changes.html has a more extensive set of
changes and https://gcc.gnu.org/gcc-6/porting_to.html has a solid
overview of issue you may encountering porting to this new version.

4 files changed, 145 insertions, 0 deletions

diff --git a/lang/gcc6/files/java-patch-hier b/lang/gcc6/files/java-patch-hier
new file mode 100644
index 000000000000..8dd7f4637f70
--- /dev/null
+++ b/lang/gcc6/files/java-patch-hier
@@ -0,0 +1,11 @@
+--- libjava/Makefile.in	2013-05-26 22:33:07.000000000 +0000
++++ libjava/Makefile.in	2013-05-31 21:19:23.000000000 +0000
+@@ -941,7 +941,7 @@
+ @BUILD_SUBLIBS_FALSE@LIBJAVA_CORE_EXTRA = 
+ @BUILD_SUBLIBS_TRUE@LIBJAVA_CORE_EXTRA = @LIBGCJ_SUBLIB_CORE_EXTRA_DEPS@
+ dbexec_LTLIBRARIES = libjvm.la
+-pkgconfigdir = $(toolexeclibdir)/pkgconfig
++pkgconfigdir = $(prefix)/libdata/pkgconfig
+ jardir = $(datadir)/java
+ jar_DATA = libgcj-$(gcc_version).jar libgcj-tools-$(gcc_version).jar \
+ 	$(am__append_5)
diff --git a/lang/gcc6/files/patch-arm-unwind-cxx-support b/lang/gcc6/files/patch-arm-unwind-cxx-support
new file mode 100644
index 000000000000..ec6959b9655c
--- /dev/null
+++ b/lang/gcc6/files/patch-arm-unwind-cxx-support
@@ -0,0 +1,106 @@
+--- UTC
+Index: gcc/ginclude/unwind-arm-common.h
+===================================================================
+--- gcc/ginclude/unwind-arm-common.h	(revision 219113)
++++ gcc/ginclude/unwind-arm-common.h	(working copy)
+@@ -82,7 +82,11 @@
+ 
+   struct _Unwind_Control_Block
+     {
++#ifdef __FreeBSD__
++      unsigned exception_class __attribute__((__mode__(__DI__)));
++#else
+       char exception_class[8];
++#endif
+       void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
+       /* Unwinder cache, private fields for the unwinder's use */
+       struct
+@@ -181,7 +185,11 @@
+ 
+   /* Support functions for the PR.  */
+ #define _Unwind_Exception _Unwind_Control_Block
++#ifdef __FreeBSD__
++  typedef unsigned _Unwind_Exception_Class __attribute__((__mode__(__DI__)));
++#else
+   typedef char _Unwind_Exception_Class[8];
++#endif
+ 
+   void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
+   _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
+Index: libstdc++-v3/libsupc++/unwind-cxx.h
+===================================================================
+--- libstdc++-v3/libsupc++/unwind-cxx.h	(revision 219147)
++++ libstdc++-v3/libsupc++/unwind-cxx.h	(working copy)
+@@ -235,7 +235,7 @@
+   return reinterpret_cast<__cxa_dependent_exception *>(exc + 1) - 1;
+ }
+ 
+-#ifdef __ARM_EABI_UNWINDER__
++#if defined(__ARM_EABI_UNWINDER__) && !defined(__FreeBSD__)
+ static inline bool
+ __is_gxx_exception_class(_Unwind_Exception_Class c)
+ {
+@@ -309,13 +309,7 @@
+   c[6] = 'R';
+   c[7] = '\0';
+ }
+-
+-static inline void*
+-__gxx_caught_object(_Unwind_Exception* eo)
+-{
+-  return (void*)eo->barrier_cache.bitpattern[0];
+-}
+-#else // !__ARM_EABI_UNWINDER__
++#else // !__ARM_EABI_UNWINDER__ || __FreeBSD__
+ // This is the primary exception class we report -- "GNUCC++\0".
+ const _Unwind_Exception_Class __gxx_primary_exception_class
+ = ((((((((_Unwind_Exception_Class) 'G' 
+@@ -339,6 +333,16 @@
+     << 8 | (_Unwind_Exception_Class) '+')
+    << 8 | (_Unwind_Exception_Class) '\x01');
+ 
++const _Unwind_Exception_Class __gxx_forced_unwind_class
++= ((((((((_Unwind_Exception_Class) 'G'
++        << 8 | (_Unwind_Exception_Class) 'N')
++       << 8 | (_Unwind_Exception_Class) 'U')
++      << 8 | (_Unwind_Exception_Class) 'C')
++     << 8 | (_Unwind_Exception_Class) 'F')
++    << 8 | (_Unwind_Exception_Class) 'O')
++   << 8 | (_Unwind_Exception_Class) 'R')
++  << 8 | (_Unwind_Exception_Class) '\0');
++
+ static inline bool
+ __is_gxx_exception_class(_Unwind_Exception_Class c)
+ {
+@@ -346,6 +350,12 @@
+       || c == __gxx_dependent_exception_class;
+ }
+ 
++static inline bool
++__is_gxx_forced_unwind_class(_Unwind_Exception_Class c)
++{
++  return c ==  __gxx_forced_unwind_class;
++}
++
+ // Only checks for primary or dependent, but not that it is a C++ exception at
+ // all.
+ static inline bool
+@@ -357,7 +367,18 @@
+ #define __GXX_INIT_PRIMARY_EXCEPTION_CLASS(c) c = __gxx_primary_exception_class
+ #define __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(c) \
+   c = __gxx_dependent_exception_class
++#define __GXX_INIT_FORCED_UNWIND_CLASS(c) c = __gxx_forced_unwind_class 
++#endif // __ARM_EABI_UNWINDER__ && !__FreeBSD__
+ 
++#ifdef __ARM_EABI_UNWINDER__
++static inline void*
++__gxx_caught_object(_Unwind_Exception* eo)
++{
++    return (void*)eo->barrier_cache.bitpattern[0];
++}
++
++#else // !__ARM_EABI_UNWINDER__
++
+ // GNU C++ personality routine, Version 0.
+ extern "C" _Unwind_Reason_Code __gxx_personality_v0
+      (int, _Unwind_Action, _Unwind_Exception_Class,
diff --git a/lang/gcc6/files/patch-unwind-ia64.h b/lang/gcc6/files/patch-unwind-ia64.h
new file mode 100644
index 000000000000..82e103a543c5
--- /dev/null
+++ b/lang/gcc6/files/patch-unwind-ia64.h
@@ -0,0 +1,21 @@
+2012-12-17  Gerald Pfeifer  <gerald@pfeifer.com>
+            Anton Shterenlikht  <mexas@bristol.ac.uk>
+
+       PR target/45650
+       * config/ia64/unwind-ia64.h: Do not mark _Unwind_FindTableEntry
+       hidden on FreeBSD.
+
+--- UTC
+Index: libgcc/config/ia64/unwind-ia64.h
+===================================================================
+--- libgcc/config/ia64/unwind-ia64.h
++++ libgcc/config/ia64/unwind-ia64.h	(working copy)
+@@ -49,4 +49,7 @@
+ extern struct unw_table_entry *
+ _Unwind_FindTableEntry (void *pc, unw_word *segment_base,
+ 			unw_word *gp, struct unw_table_entry *ent)
+-			__attribute__ ((__visibility__ ("hidden")));
++#ifndef __FreeBSD__
++			__attribute__ ((__visibility__ ("hidden")))
++#endif
++			;
diff --git a/lang/gcc6/files/pkg-message.in b/lang/gcc6/files/pkg-message.in
new file mode 100644
index 000000000000..433c37a3f89b
--- /dev/null
+++ b/lang/gcc6/files/pkg-message.in
@@ -0,0 +1,7 @@
+To ensure binaries built with this toolchain find appropriate versions
+of the necessary run-time libraries, you may want to link using
+
+  -Wl,-rpath=%%TARGLIB%%
+
+For ports leveraging USE_GCC, USES=compiler, or USES=fortran this happens
+transparently.