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968dc13572
In absence of LTO, and dynamic libatomic, la.so ends up in the needs section of every toolchain executable; some consider this an issue. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12345 Closes #12359
29 lines
692 B
Plaintext
29 lines
692 B
Plaintext
dnl #
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dnl # If -latomic exists and atomic.c doesn't link without it,
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dnl # it's needed for __atomic intrinsics.
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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 required])
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saved_libs="$LIBS"
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LIBS="$LIBS -latomic"
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LIBATOMIC_LIBS=""
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AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
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LIBS="$saved_libs"
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saved_cflags="$CFLAGS"
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CFLAGS="$CFLAGS -isystem lib/libspl/include"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([#include "lib/libspl/atomic.c"], [])], [], [LIBATOMIC_LIBS="-latomic"])
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CFLAGS="$saved_cflags"
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])
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if test -n "$LIBATOMIC_LIBS"; then
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AC_MSG_RESULT([yes])
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else
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AC_MSG_RESULT([no])
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fi
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LIBS="$saved_libs"
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AC_SUBST([LIBATOMIC_LIBS])
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])
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