gcc: update to version 7.4.0, Add config options

for coping libc.a, libpthread.a and libstdc++ to target.
Add config option to eliminate need for -lstdc++ and -lgcc_pic
switches when linking statically

Signed-off-by: Noble Pepper <noblepepper@gmail.com>

devel/gcc/patches/950-cpp_file_path_translation.patch

@@ -1,8 +1,18 @@
+commit 331735a357a73c7b8adc205241ac3cc6543d985e
+Author: Felix Fietkau <nbd@openwrt.org>
+Date:   Tue Nov 17 12:38:22 2015 +0000
+
+    gcc: add a patch to 5.x that supports translation of __FILE__ paths
+    
+    Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+    
+    SVN-Revision: 47490
+
 Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47047
 
 --- a/gcc/c-family/c-opts.c
 +++ b/gcc/c-family/c-opts.c
-@@ -581,6 +581,10 @@ c_common_handle_option (size_t scode, co
+@@ -588,6 +588,10 @@ c_common_handle_option (size_t scode, co
        add_path (xstrdup (arg), SYSTEM, 0, true);
        break;
  
@@ -15,9 +25,9 @@ Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4
        break;
 --- a/gcc/c-family/c.opt
 +++ b/gcc/c-family/c.opt
-@@ -1528,6 +1528,10 @@ iquote
+@@ -1825,6 +1825,10 @@ iquote
  C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
- -iquote <dir>	Add <dir> to the end of the quote include path
+ -iquote <dir>	Add <dir> to the end of the quote include path.
  
 +iremap
 +C ObjC C++ ObjC++ Joined Separate
@@ -25,22 +35,22 @@ Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4
 +
  iwithprefix
  C ObjC C++ ObjC++ Joined Separate
- -iwithprefix <dir>	Add <dir> to the end of the system include path
+ -iwithprefix <dir>	Add <dir> to the end of the system include path.
 --- a/gcc/doc/cpp.texi
 +++ b/gcc/doc/cpp.texi
-@@ -4441,6 +4441,7 @@ without notice.
+@@ -4272,6 +4272,7 @@ Refer to the GCC manual for full documen
  @c man begin SYNOPSIS
  cpp [@option{-D}@var{macro}[=@var{defn}]@dots{}] [@option{-U}@var{macro}]
      [@option{-I}@var{dir}@dots{}] [@option{-iquote}@var{dir}@dots{}]
 +    [@option{-iremap}@var{src}:@var{dst}]
-     [@option{-W}@var{warn}@dots{}]
      [@option{-M}|@option{-MM}] [@option{-MG}] [@option{-MF} @var{filename}]
      [@option{-MP}] [@option{-MQ} @var{target}@dots{}]
+     [@option{-MT} @var{target}@dots{}]
 --- a/gcc/doc/cppopts.texi
 +++ b/gcc/doc/cppopts.texi
-@@ -532,6 +532,12 @@ Search @var{dir} only for header files r
- If @var{dir} begins with @code{=}, then the @code{=} will be replaced
- by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
+@@ -220,6 +220,12 @@ extensions @samp{.i}, @samp{.ii} or @sam
+ extensions that GCC uses for preprocessed files created by
+ @option{-save-temps}.
  
 +@item -iremap @var{src}:@var{dst}
 +@opindex iremap
@@ -53,20 +63,9 @@ Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4
  When preprocessing, handle directives, but do not expand macros.
 --- a/gcc/doc/invoke.texi
 +++ b/gcc/doc/invoke.texi
-@@ -494,8 +494,8 @@ Objective-C and Objective-C++ Dialects}.
- @item Directory Options
- @xref{Directory Options,,Options for Directory Search}.
- @gccoptlist{-B@var{prefix} -I@var{dir} -iplugindir=@var{dir} @gol
---iquote@var{dir} -L@var{dir} -specs=@var{file} -I- @gol
----sysroot=@var{dir} --no-sysroot-suffix}
-+-iquote@var{dir} -iremap@var{src}:@var{dst} -L@var{dir} -specs=@var{file} @gol
-+-I- --sysroot=@var{dir} --no-sysroot-suffix}
- 
- @item Machine Dependent Options
- @xref{Submodel Options,,Hardware Models and Configurations}.
-@@ -11479,6 +11479,12 @@ be searched for header files only for th
- "@var{file}"}; they are not searched for @code{#include <@var{file}>},
- otherwise just like @option{-I}.
+@@ -11871,6 +11871,12 @@ by @option{-fplugin=@var{name}} instead
+ @option{-fplugin=@var{path}/@var{name}.so}.  This option is not meant
+ to be used by the user, but only passed by the driver.
  
 +@item -iremap @var{src}:@var{dst}
 +@opindex iremap
@@ -79,7 +78,7 @@ Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4
  Add directory @var{dir} to the list of directories to be searched
 --- a/libcpp/include/cpplib.h
 +++ b/libcpp/include/cpplib.h
-@@ -751,6 +751,9 @@ extern void cpp_set_lang (cpp_reader *,
+@@ -820,6 +820,9 @@ extern void cpp_set_lang (cpp_reader *,
  /* Set the include paths.  */
  extern void cpp_set_include_chains (cpp_reader *, cpp_dir *, cpp_dir *, int);
  
@@ -91,7 +90,7 @@ Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4
     call cpp_finish on that reader.  You can either edit the callbacks
 --- a/libcpp/macro.c
 +++ b/libcpp/macro.c
-@@ -224,6 +224,64 @@ static const char * const monthnames[] =
+@@ -227,6 +227,64 @@ static const char * const monthnames[] =
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  };
  
@@ -156,7 +155,7 @@ Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4
  /* Helper function for builtin_macro.  Returns the text generated by
     a builtin macro. */
  const uchar *
-@@ -286,6 +344,7 @@ _cpp_builtin_macro_text (cpp_reader *pfi
+@@ -290,6 +348,7 @@ _cpp_builtin_macro_text (cpp_reader *pfi
        {
  	unsigned int len;
  	const char *name;
@@ -164,7 +163,7 @@ Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4
  	uchar *buf;
  	
  	if (node->value.builtin == BT_FILE)
-@@ -297,6 +356,7 @@ _cpp_builtin_macro_text (cpp_reader *pfi
+@@ -301,6 +360,7 @@ _cpp_builtin_macro_text (cpp_reader *pfi
  	    if (!name)
  	      abort ();
  	  }
@@ -172,7 +171,7 @@ Forward ported from attachment to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4
  	len = strlen (name);
  	buf = _cpp_unaligned_alloc (pfile, len * 2 + 3);
  	result = buf;
-@@ -304,6 +364,7 @@ _cpp_builtin_macro_text (cpp_reader *pfi
+@@ -308,6 +368,7 @@ _cpp_builtin_macro_text (cpp_reader *pfi
  	buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len);
  	*buf++ = '"';
  	*buf = '\0';