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dd, shred: use fdatasync only if declared

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* m4/jm-macros.m4 (coreutils_MACROS): Use fdatasync only if declared.
MacOS X 10.7 has an fdatasync that is not declared, and is rumored to
be ineffective.  (Bug#9141)
This commit is contained in:
Paul Eggert
2011-07-22 13:40:03 -07:00
parent f603b2d228
commit 339613b6bd
1 changed files with 10 additions and 4 deletions
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14
m4/jm-macros.m4
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@@ -93,14 +93,20 @@ AC_DEFUN([coreutils_MACROS],
cu_PREREQ_STAT_PROG
# for dd.c and shred.c
coreutils_saved_libs=$LIBS
LIB_FDATASYNC=
#
# Use fdatasync only if declared. On MacOS X 10.7, fdatasync exists but
# is not declared, and is ineffective.
LIB_FDATASYNC=
AC_SUBST([LIB_FDATASYNC])
AC_CHECK_DECLS_ONCE([fdatasync])
if test $ac_cv_have_decl_fdatasync = yes; then
coreutils_saved_libs=$LIBS
AC_SEARCH_LIBS([fdatasync], [rt posix4],
[test "$ac_cv_search_fdatasync" = "none required" ||
LIB_FDATASYNC=$ac_cv_search_fdatasync])
AC_SUBST([LIB_FDATASYNC])
AC_CHECK_FUNCS([fdatasync])
LIBS=$coreutils_saved_libs
LIBS=$coreutils_saved_libs
fi
# Check whether libcap is usable -- for ls --color support
LIB_CAP=