gnu: bootstrap-gcc: Don't use CPATH search paths.

This updates the bootstrap-gcc to use the same search path strategy as
the main compilers, making the bootstrap environment more similar across
architectures, and fixing the bootstrap path on non-x86 architectures
again.

This is a follow up to commit 7cde865f12dd67e55946a52a21103e71f447eced.

* gnu/packages/bootstrap.scm (%bootstrap-gcc)[native-search-paths]: Use
  C_INCLUDE_PATH and CPLUS_INCLUDE_PATH instead of CPATH.

1 files changed, 5 insertions, 1 deletions

diff --git a/gnu/packages/bootstrap.scm b/gnu/packages/bootstrap.scm
index c39e60ec8bc..fee2ae11995 100644
--- a/gnu/packages/bootstrap.scm
+++ b/gnu/packages/bootstrap.scm
@@ -5,6 +5,7 @@
 ;;; Copyright © 2018, 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2019 Carl Dong <contact@carldong.me>
 ;;; Copyright © 2019 Léo Le Bouter <lle-bout@zaclys.net>
+;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -740,9 +741,12 @@ exec ~a/bin/.gcc-wrapped -B~a/lib \
                            "1m5miqkyng45l745n0sfafdpjkqv9225xf44jqkygwsipj2cv9ks")))))))))
     (native-search-paths
      (list (search-path-specification
-            (variable "CPATH")
+            (variable "C_INCLUDE_PATH")
             (files '("include")))
            (search-path-specification
+            (variable "CPLUS_INCLUDE_PATH")
+            (files '("include/c++" "include")))
+           (search-path-specification
             (variable "LIBRARY_PATH")
             (files '("lib" "lib64")))))
     (synopsis "Bootstrap binaries of the GNU Compiler Collection")