GNU bug report logs - #36477
Add Guix System cross-compilation support

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From: Mathieu Othacehe <m.othacehe <at> gmail.com>
To: 36477 <at> debbugs.gnu.org
Cc: Mathieu Othacehe <m.othacehe <at> gmail.com>
Subject: [bug#36477] [PATCH 11/31] gnu: texinfo: Fix cross-compilation.
Date: Mon,  8 Jul 2019 11:58:53 +0200

* gnu/packages/texinfo.scm (texinfo)[arguments]: Do not reset environment
before running configure with the native compiler, in a cross-compilation
context,
[inputs]: move perl from here ...
[native-inputs]: ... to here. Also add ncurses that is needed in a
cross-compilation context to build texinfo native tools.
---
 gnu/packages/texinfo.scm | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/texinfo.scm b/gnu/packages/texinfo.scm
index fa98bd56b8..36bb9132d9 100644
--- a/gnu/packages/texinfo.scm
+++ b/gnu/packages/texinfo.scm
@@ -42,8 +42,28 @@
                (base32
                 "0qjzvbvnv9003xdrcpi3jp7y68j4hq2ciw9frh2hghh698zlnxvp"))))
     (build-system gnu-build-system)
-    (inputs `(("ncurses" ,ncurses)
-              ("perl" ,perl)))
+    (arguments
+     ;; When cross-compiling, the package is configured twice: once with the
+     ;; native compiler and once with the cross-compiler. During the configure
+     ;; with the native compiler, the environment is reset. This leads to
+     ;; multiple environment variables missing. Do not reset the environment
+     ;; to prevent that.
+     `(,@(if (%current-target-system)
+             '(#:phases
+               (modify-phases %standard-phases
+                 (add-before 'configure 'fix-cross-configure
+                   (lambda _
+                     (substitute* "configure"
+                       (("env -i")
+                        "env "))
+                     #t))))
+             '())))
+    (inputs `(("ncurses" ,ncurses)))
+    ;; When cross-compiling, texinfo will build some of it's own binaries with
+    ;; the native compiler. This means ncurses is needed both in both inputs
+    ;; and native-inputs.
+    (native-inputs `(("perl" ,perl)
+                     ("ncurses" ,ncurses)))
 
     (native-search-paths
      ;; This is the variable used by the standalone Info reader.
-- 
2.17.1

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