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| author | Paul Eggert <eggert@cs.ucla.edu> | 2011-07-22 13:40:03 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2011-07-22 13:41:19 -0700 |
| commit | 339613b6bdd8d4a51435cba9e903b8b5bb082da4 (patch) | |
| tree | 170c9516716a58b4a3c85414094dfcc74601045d | |
| parent | f603b2d228e4f5ea811c17470361b683e4fee1ee (diff) | |
| download | coreutils-339613b6bdd8d4a51435cba9e903b8b5bb082da4.tar.xz | |
dd, shred: use fdatasync only if declared
* 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)
| -rw-r--r-- | m4/jm-macros.m4 | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/m4/jm-macros.m4 b/m4/jm-macros.m4 index 6e9722100..58b000d3f 100644 --- a/m4/jm-macros.m4 +++ b/m4/jm-macros.m4 @@ -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= |