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memfd-wrappers: only define memfd_create() if not already defined

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glibc 2.27 is to be released soon, and it will provide memfd_create().
If glibc provides the function, we must not define it ourselves,
otherwise building fails due to conflict between the two implementations
of the same function.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=104733
This commit is contained in:
Tanu Kaskinen 2018-01-24 03:51:49 +02:00
parent 6d7e057b37
commit dfb0460fb4
2 changed files with 7 additions and 3 deletions
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3
configure.ac
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@ -610,6 +610,9 @@ AS_IF([test "x$enable_memfd" = "xyes" && test "x$HAVE_MEMFD" = "x0"],
[AC_MSG_ERROR([*** Your Linux kernel does not support memfd shared memory.
*** Use linux v3.17 or higher for such a feature.])])
AS_IF([test "x$HAVE_MEMFD" = "x1"],
AC_CHECK_FUNCS([memfd_create]))
AC_SUBST(HAVE_MEMFD)
AM_CONDITIONAL([HAVE_MEMFD], [test "x$HAVE_MEMFD" = x1])
AS_IF([test "x$HAVE_MEMFD" = "x1"], AC_DEFINE([HAVE_MEMFD], 1, [Have memfd shared memory.]))