[bug#44750] [PATCH v2] gnu: gcc-arm-none-eabi: Fix C++ header location

[Morgan.J.Smith@outlook.com]

From: Morgan Smith <Morgan.J.Smith@outlook.com>

* gnu/packages/embedded.scm (gcc-arm-none-eabi-4.9)[native-search-paths]:
Add C++ header location

* gnu/packages/embedded.scm (gcc-arm-none-eabi-7-2018-q2-update)[native-search-paths]:
Add C++ header location

* gnu/packages/embedded.scm (make-libstdc++-arm-none-eabi)[arguments]: Change
C++ header install location to include/c++

Previously the C++ headers where installed in the include folder, overwriting
some C headers
---

Apparently I needed to keep the original include directories as well. This
patch actually builds unlike the last one. I've successfully used the generated
arm-none-eabi to build a project that required stdlib.h (one of the headers
that got overridden)

---
 gnu/packages/embedded.scm | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/gnu/packages/embedded.scm b/gnu/packages/embedded.scm
index d6f487bd17..73375a211d 100644
--- a/gnu/packages/embedded.scm
+++ b/gnu/packages/embedded.scm
@@ -7,6 +7,7 @@
 ;;; Copyright © 2018, 2019 Clément Lassieur <clement@lassieur.org>
 ;;; Copyright © 2020 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2020 Björn Höfling <bjoern.hoefling@bjoernhoefling.de>
+;;; Copyright © 2020 Morgan Smith <Morgan.J.Smith@outlook.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -143,7 +144,7 @@
               (files '("arm-none-eabi/include")))
              (search-path-specification
               (variable "CROSS_CPLUS_INCLUDE_PATH")
-              (files '("arm-none-eabi/include")))
+              (files '("arm-none-eabi/include" "arm-none-eabi/include/c++")))
              (search-path-specification
               (variable "CROSS_LIBRARY_PATH")
               (files '("arm-none-eabi/lib"))))))))
@@ -313,7 +314,7 @@ usable on embedded products.")
               (files '("arm-none-eabi/include")))
              (search-path-specification
               (variable "CROSS_CPLUS_INCLUDE_PATH")
-              (files '("arm-none-eabi/include")))
+              (files '("arm-none-eabi/include" "arm-none-eabi/include/c++")))
              (search-path-specification
               (variable "CROSS_LIBRARY_PATH")
               (files '("arm-none-eabi/lib"))))))))
@@ -376,7 +377,7 @@ usable on embedded products.")
              "--with-newlib"
              ,(string-append "--with-gxx-include-dir="
                              (assoc-ref %outputs "out")
-                             "/arm-none-eabi/include")))))
+                             "/arm-none-eabi/include/c++")))))
       (native-inputs
        `(("newlib" ,newlib)
          ("xgcc" ,xgcc)
-- 
2.29.2