Update base/gcc to work with devel/freebsd-gcc6.

[jhb]

Summary

• Explicitly set all the toolchain <foo>_FOR_TARGET variables. GCC's default guess for CC, etc. happened to work with the powerpc64-gcc port, but fails when the binaries have a suffix like the '6' suffix in freebsd-gcc6. Setting these variables explicitly keeps GCC's build from having to guess.
• Pull patches from freebsd6-gcc instead of powerpc64-gcc.
• Use per-arch plists.
• Simplify the post-install steps to keep the hard links the normal install performs and avoid renaming binaries. Keep links to 'cc' and 'c++'.

Test Plan

• built base/gcc for amd64 (native), i386 and mips (using freebsd6-gcc via CROSS_TOOLCHAIN)

[jhb]

• Drop an editor temp file.

head/base/gcc/Makefile

 
 #define SYSTRAP(x)                                                      \
                         mov ip, r7;                                     \
                         ldr r7, =SYS_ ## x;                             \
                         swi 0;                                          \
                         mov r7, ip
 
 #define CERROR          _C_LABEL(cerror)
-#define CURBRK          _C_LABEL(curbrk)
 
 #define _SYSCALL_NOERROR(x)                                             \
         ENTRY(__CONCAT(__sys_, x));                                     \
         .weak _C_LABEL(x);                                              \
         .set _C_LABEL(x), _C_LABEL(__CONCAT(__sys_,x));                 \
         .weak _C_LABEL(__CONCAT(_,x));                                  \
         .set _C_LABEL(__CONCAT(_,x)),_C_LABEL(__CONCAT(__sys_,x));      \
         SYSTRAP(x)

head/base/gcc/pkg-plist

 
 #define SYSTRAP(x)                                                      \
                         mov ip, r7;                                     \
                         ldr r7, =SYS_ ## x;                             \
                         swi 0;                                          \
                         mov r7, ip
 
 #define CERROR          _C_LABEL(cerror)
-#define CURBRK          _C_LABEL(curbrk)
 
 #define _SYSCALL_NOERROR(x)                                             \
         ENTRY(__CONCAT(__sys_, x));                                     \
         .weak _C_LABEL(x);                                              \
         .set _C_LABEL(x), _C_LABEL(__CONCAT(__sys_,x));                 \
         .weak _C_LABEL(__CONCAT(_,x));                                  \
         .set _C_LABEL(__CONCAT(_,x)),_C_LABEL(__CONCAT(__sys_,x));      \
         SYSTRAP(x)

head/base/gcc/pkg-plist.amd64

 
 #define SYSTRAP(x)                                                      \
                         mov ip, r7;                                     \
                         ldr r7, =SYS_ ## x;                             \
                         swi 0;                                          \
                         mov r7, ip
 
 #define CERROR          _C_LABEL(cerror)
-#define CURBRK          _C_LABEL(curbrk)
 
 #define _SYSCALL_NOERROR(x)                                             \
         ENTRY(__CONCAT(__sys_, x));                                     \
         .weak _C_LABEL(x);                                              \
         .set _C_LABEL(x), _C_LABEL(__CONCAT(__sys_,x));                 \
         .weak _C_LABEL(__CONCAT(_,x));                                  \
         .set _C_LABEL(__CONCAT(_,x)),_C_LABEL(__CONCAT(__sys_,x));      \
         SYSTRAP(x)

head/base/gcc/pkg-plist.i386

 
 #define SYSTRAP(x)                                                      \
                         mov ip, r7;                                     \
                         ldr r7, =SYS_ ## x;                             \
                         swi 0;                                          \
                         mov r7, ip
 
 #define CERROR          _C_LABEL(cerror)
-#define CURBRK          _C_LABEL(curbrk)
 
 #define _SYSCALL_NOERROR(x)                                             \
         ENTRY(__CONCAT(__sys_, x));                                     \
         .weak _C_LABEL(x);                                              \
         .set _C_LABEL(x), _C_LABEL(__CONCAT(__sys_,x));                 \
         .weak _C_LABEL(__CONCAT(_,x));                                  \
         .set _C_LABEL(__CONCAT(_,x)),_C_LABEL(__CONCAT(__sys_,x));      \
         SYSTRAP(x)