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35 lines
1.2 KiB
Plaintext
35 lines
1.2 KiB
Plaintext
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dnl #
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dnl # If -latomic exists, it's needed for __atomic intrinsics.
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dnl #
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dnl # Some systems (like FreeBSD 13) don't have a libatomic at all because
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dnl # their toolchain doesn't ship it – they obviously don't need it.
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dnl #
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dnl # Others (like sufficiently ancient CentOS) have one,
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dnl # but terminally broken or unlinkable (e.g. it's a dangling symlink,
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dnl # or a linker script that points to a nonexistent file) –
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dnl # most arches affected by this don't actually need -latomic (and if they do,
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dnl # then they should have libatomic that actually exists and links,
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dnl # so don't fall into this category).
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dnl #
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dnl # Technically, we could check if the platform *actually* needs -latomic,
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dnl # or if it has native support for all the intrinsics we use,
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dnl # but it /really/ doesn't matter, and C11 recommends to always link it.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_USER_LIBATOMIC], [
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AC_MSG_CHECKING([whether -latomic is present])
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saved_libs="$LIBS"
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LIBS="$LIBS -latomic"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
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LIBATOMIC_LIBS="-latomic"
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AC_MSG_RESULT([yes])
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], [
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LIBATOMIC_LIBS=""
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AC_MSG_RESULT([no])
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])
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LIBS="$saved_libs"
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AC_SUBST([LIBATOMIC_LIBS])
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])
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