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build: Do not build (guix build syscalls) if 'mount' is missing from libc.

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This disables compilation of this module on GNU/Hurd.
Reported by Manolis Ragkousis <manolis837@gmail.com>.

* m4/guix.m4 (GUIX_CHECK_LIBC_MOUNT): New variable.
* configure.ac: Use it.  Define 'BUILD_SYSCALLS_MODULE' conditional.
* Makefile.am (MODULES, EXTRA_DIST): Make 'guix/build/syscalls.scm'
  conditional on BUILD_SYSCALLS_MODULE.
This commit is contained in:
Ludovic Courtès
2015-08-26 14:07:31 +02:00
parent c2b8467645
commit 12e5b26643
3 changed files with 32 additions and 1 deletions
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13
m4/guix.m4
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@@ -257,3 +257,16 @@ AC_DEFUN([GUIX_ASSERT_CXX11], [
AC_MSG_ERROR([C++ compiler '$CXX' does not support the C++11 standard])
fi
])
dnl GUIX_CHECK_LIBC_MOUNT
dnl
dnl Check whether libc provides 'mount'. On GNU/Hurd it doesn't (yet).
AC_DEFUN([GUIX_CHECK_LIBC_MOUNT], [
AC_CACHE_CHECK([whether libc provides 'mount'], [guix_cv_libc_has_mount],
[GUILE_CHECK([retval], [(dynamic-func \"mount\" (dynamic-link))])
if test "$retval" = 0; then
guix_cv_libc_has_mount="yes"
else
guix_cv_libc_has_mount="no"
fi])
])