39/61: gnu: make-linux-libre: Fix cross-compilation.

[guix-commits]

mothacehe pushed a commit to branch wip-cross-system
in repository guix.

commit c9d4d49c3bd2d8c7fae25b3fc9e3ce20972182cd
Author: Mathieu Othacehe <address@hidden>
Date:   Fri Aug 2 11:25:22 2019 +0200

    gnu: make-linux-libre: Fix cross-compilation.
    
    * gnu/packages/linux.scm (make-linux-libre)[arguments]: Unset CROSS_CPATH to
    make sure that cross-libc is not found. Otherwise, some of its header would
    conflict with the one from linux (stdint.h and linux/types.h).
---
 gnu/packages/linux.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gnu/packages/linux.scm b/gnu/packages/linux.scm
index 0036b85..ac7312b 100644
--- a/gnu/packages/linux.scm
+++ b/gnu/packages/linux.scm
@@ -665,6 +665,9 @@ for ARCH and optionally VARIANT, or #f if there is no such 
configuration."
          (replace 'configure
            (lambda* (#:key inputs native-inputs target #:allow-other-keys)
              ;; Avoid introducing timestamps
+             ,@(if (%current-target-system)
+                   '((unsetenv "CROSS_CPATH"))
+                   '())
              (setenv "KCONFIG_NOTIMESTAMP" "1")
              (setenv "KBUILD_BUILD_TIMESTAMP" (getenv "SOURCE_DATE_EPOCH"))