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| author | Pádraig Brady <P@draigBrady.com> | 2014-10-31 18:12:15 +0000 |
|---|---|---|
| committer | Pádraig Brady <P@draigBrady.com> | 2014-11-03 15:10:33 +0100 |
| commit | c8e57ce5bbfc176ca622fcfff5af1982dd9ff17e (patch) | |
| tree | d2220bb41dfe4779dafefd5b4d58122f781a4cef /m4 | |
| parent | 08a713e078f03e7a870b0111960c6f4c54357152 (diff) | |
| download | gnulib-c8e57ce5bbfc176ca622fcfff5af1982dd9ff17e.tar.gz | |
linkat: wrap to handle symlinks on OS X 10.10
* m4/linkat.m4 (gl_FUNC_LINKAT): linkat() is available on Yosemite
but not usable because it doesn't support creating hardlinks
to symlinks. Therefore add a generic test for this capability
and fallback to our emulation if linkat() fails with ENOTSUP.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/linkat.m4 | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/m4/linkat.m4 b/m4/linkat.m4 index 2da0e30cb1..a2b5213c16 100644 --- a/m4/linkat.m4 +++ b/m4/linkat.m4 @@ -20,6 +20,27 @@ AC_DEFUN([gl_FUNC_LINKAT], if test $ac_cv_func_linkat = no; then HAVE_LINKAT=0 else + dnl OS X Yosemite has linkat() but it's not sufficient + dnl to our needs since it doesn't support creating + dnl hardlinks to symlinks. Therefore check for that + dnl capability before considering using the system version. + AC_CACHE_CHECK([whether linkat() can link symlinks], + [gl_cv_func_linkat_nofollow], + [rm -rf conftest.l1 conftest.l2 + ln -s target conftest.l1 + AC_RUN_IFELSE([AC_LANG_PROGRAM( + [[#include <fcntl.h> + #include <unistd.h> + ]], + [return linkat (AT_FDCWD, "conftest.l1", AT_FDCWD, + "conftest.l2", 0); + ])], + [gl_cv_func_linkat_nofollow=yes + LINKAT_SYMLINK_NOTSUP=0], + [gl_cv_func_linkat_nofollow=no + LINKAT_SYMLINK_NOTSUP=1]) + rm -rf conftest.l1 conftest.l2]) + AC_CACHE_CHECK([whether linkat(,AT_SYMLINK_FOLLOW) works], [gl_cv_func_linkat_follow], [rm -rf conftest.f1 conftest.f2 @@ -37,6 +58,7 @@ choke me [gl_cv_func_linkat_follow=yes], [gl_cv_func_linkat_follow="need runtime check"]) rm -rf conftest.f1 conftest.f2]) + AC_CACHE_CHECK([whether linkat handles trailing slash correctly], [gl_cv_func_linkat_slash], [rm -rf conftest.a conftest.b conftest.c conftest.d @@ -85,11 +107,15 @@ choke me *yes) gl_linkat_slash_bug=0 ;; *) gl_linkat_slash_bug=1 ;; esac + if test "$gl_cv_func_linkat_follow" != yes \ + || test "$gl_cv_func_linkat_nofollow" != yes \ || test $gl_linkat_slash_bug = 1; then REPLACE_LINKAT=1 AC_DEFINE_UNQUOTED([LINKAT_TRAILING_SLASH_BUG], [$gl_linkat_slash_bug], [Define to 1 if linkat fails to recognize a trailing slash.]) + AC_DEFINE_UNQUOTED([LINKAT_SYMLINK_NOTSUP], [$LINKAT_SYMLINK_NOTSUP], + [Define to 1 if linkat can create hardlinks to symlinks]) fi fi ]) |