gnu: coreutils: Fix cross-compilation.

Previously cross-compiling coreutils would fail with:

  aarch64-linux-gnu-gcc   -Os -g0 -Wl,--as-needed -static -pthread -o src/uptime src/uptime.o src/libver.a lib/libcoreutils.a  lib/libcoreutils.a
  /gnu/store/hk8615wmmzk28k5z06g69jm6vbhc8lgk-glibc-cross-aarch64-linux-gnu-2.26.105-g0890d5379c-static/lib/libc.a(mktime.o): In function `__mktime_internal':
  /tmp/guix-build-glibc-cross-aarch64-linux-gnu-2.26.105-g0890d5379c.drv-0/glibc-2.26-105-g0890d5379c/time/mktime.c:353: multiple definition of `__mktime_internal'
  lib/libcoreutils.a(mktime.o):mktime.c:(.text+0x214): first defined here
  collect2: error: ld returned 1 exit status

* gnu/packages/base.scm (coreutils)[arguments]: Add #:configure-flags
when cross-compiling.

diff --git a/gnu/packages/base.scm b/gnu/packages/base.scm
index 022ee00..53db5fe 100644 (file)
--- a/gnu/packages/base.scm
+++ b/gnu/packages/base.scm
@@ -339,7 +339,13 @@ used to apply commands with arbitrarily long arguments.")
                        (("/bin/sh") (which "sh")))
                      (substitute* (find-files "tests" "\\.sh$")
                        (("#!/bin/sh") (which "sh")))
-                     #t)))))
+                     #t)))
+
+      ;; Work around a cross-compilation bug whereby libcoreutils.a would
+      ;; provide '__mktime_internal', which conflicts with the one in libc.a.
+      ,@(if (%current-target-system)
+            `(#:configure-flags '("gl_cv_func_working_mktime=yes"))
+            '())))
    (synopsis "Core GNU utilities (file, text, shell)")
    (description
     "GNU Coreutils includes all of the basic command-line tools that are