gcc: introduce `--posixly` command line option to ease the compilation of POSIX software

cross/patch/gcc.patch

@@ -2,7 +2,7 @@ diff --git a/src/gcc/gcc/config.gcc b/src/gcc/gcc/config.gcc
 index ddd3b8f..702aa59 100644
 --- a/src/gcc/gcc/config.gcc
 +++ b/src/gcc/gcc/config.gcc
-@@ -947,6 +947,16 @@ case ${target} in
+@@ -947,6 +947,18 @@ case ${target} in
      tmake_file="$tmake_file vms/t-vmsnative"
    fi
    ;;
@@ -10,6 +10,7 @@ index ddd3b8f..702aa59 100644
 +  gas=yes
 +  gnu_ld=yes
 +  default_use_cxa_atexit=yes
++  extra_options="$extra_options jehanne.opt"
 +  case $target in
 +  x86_64-*)
 +    native_system_header_dir="/arch/amd64/include"
@@ -19,7 +20,7 @@ index ddd3b8f..702aa59 100644
  *-*-vxworks*)
    tmake_file=t-vxworks
    xm_defines=POSIX
-@@ -1635,6 +1647,9 @@ i[34567]86-*-elfiamcu)
+@@ -1635,6 +1648,9 @@ i[34567]86-*-elfiamcu)
  i[34567]86-*-elf*)
  	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h"
  	;;

cross/patch/gcc/gcc/config/jehanne.h

@@ -18,16 +18,30 @@
 
 #undef TARGET_JEHANNE
 #define TARGET_JEHANNE 1
+/*
+#undef DRIVER_SELF_SPECS
+#define DRIVER_SELF_SPECS "%{-posixly}"
+*/
+
+/* GCC on Jehanne includes and link libraries from /sys and /arch.
+ * To ease the port of POSIX applications, we include a --posixly option
+ * to the GCC driver that will be substituted with proper options
+ */
+#undef CPP_SPEC
+#define CPP_SPEC "%{-posixly:-isystem/posix/include}"
+
+#undef LINK_SPEC
+#define LINK_SPEC "%{-posixly:-L/posix/lib}"
 
-/* Default arguments you want when running x86_64-jehanne-gcc */
 #undef LIB_SPEC
-#define LIB_SPEC "-ljehanne"
+#define LIB_SPEC "%{-posixly:%{!shared:%{g*:-lg} %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}} -ljehanne"
+
 
 #undef STANDARD_STARTFILE_PREFIX
 #define STANDARD_STARTFILE_PREFIX "/arch/amd64/lib/"
 
-#undef MD_STARTFILE_PREFIX
-#define MD_STARTFILE_PREFIX "/arch/amd64/lib/"
+/* GCC include paths definition START
+ */
 
 /* Architecture specific header (u.h) goes here (from config.gcc) */
 #define ARCH_INCLUDE_DIR NATIVE_SYSTEM_HEADER_DIR 
@@ -35,14 +49,65 @@
 /* The default include dir is /sys/include */
 #define PORTABLE_INCLUDE_DIR "/sys/include"
 
+#ifdef GPLUSPLUS_INCLUDE_DIR
+    /* Pick up GNU C++ generic include files.  */
+# define ID_GPLUSPLUS { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1, GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },
+#else
+# define ID_GPLUSPLUS 
+#endif
+#ifdef GPLUSPLUS_TOOL_INCLUDE_DIR
+    /* Pick up GNU C++ target-dependent include files.  */
+# define ID_GPLUSPLUS_TOOL { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1, GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 1 },
+#else
+# define ID_GPLUSPLUS_TOOL
+#endif
+#ifdef GPLUSPLUS_BACKWARD_INCLUDE_DIR
+    /* Pick up GNU C++ backward and deprecated include files.  */
+# define ID_GPLUSPLUS_BACKWARD { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1, GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },
+#else
+# define ID_GPLUSPLUS_BACKWARD
+#endif
+#ifdef GCC_INCLUDE_DIR
+    /* This is the dir for gcc's private headers.  */
+# define ID_GCC { GCC_INCLUDE_DIR, "GCC", 0, 0, 0, 0 },
+#else
+# define ID_GCC
+#endif
+#ifdef PREFIX_INCLUDE_DIR
+# define ID_PREFIX { PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0 },
+#else
+# define ID_PREFIX
+#endif
+#if defined (CROSS_INCLUDE_DIR) && defined (CROSS_DIRECTORY_STRUCTURE) && !defined (TARGET_SYSTEM_ROOT)
+# define ID_CROSS { CROSS_INCLUDE_DIR, "GCC", 0, 0, 0, 0 },
+#else
+# define ID_CROSS
+#endif
+#ifdef TOOL_INCLUDE_DIR
+    /* Another place the target system's headers might be.  */
+# define ID_TOOL { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1, 0, 0 },
+#else
+# define ID_TOOL
+#endif
+
 #undef INCLUDE_DEFAULTS
 #define INCLUDE_DEFAULTS				\
   {							\
+    ID_GPLUSPLUS					\
+    ID_GPLUSPLUS_TOOL					\
+    ID_GPLUSPLUS_BACKWARD				\
+    ID_GCC						\
+    ID_PREFIX						\
+    ID_CROSS						\
+    ID_TOOL						\
     { PORTABLE_INCLUDE_DIR, 0, 0, 0, 1, 0 },		\
     { ARCH_INCLUDE_DIR, 0, 0, 0, 1, 0 },		\
     { 0, 0, 0, 0, 0, 0 }				\
   }
 
+/* GCC include paths definition END
+ */
+
 /* Files that are linked before user code.
    The %s tells gcc to look for these files in the library directory. */
 #undef STARTFILE_SPEC

cross/patch/gcc/gcc/config/jehanne.opt

@@ -0,0 +1,25 @@
+; Jehanne options.
+
+; This file is part of Jehanne.
+;
+; Copyright (C) 2016-2020 Giacomo Tesio <giacomo@tesio.it>
+;
+; Jehanne is free software: you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation, version 2 of the License.
+;
+; Jehanne is distributed in the hope that it will be useful,
+; but WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; GNU General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
+
+; Please try to keep this file in ASCII collating order.
+
+-posixly
+C ObjC C++ ObjC++ Driver RejectNegative
+Lookup for POSIX includes and libraries in /posix
+
+; This comment is to ensure we retain the blank line above.