diff options
Diffstat (limited to 'gnulib/m4/linkat.m4')
| m--------- | gnulib | 0 | ||||
| -rw-r--r-- | gnulib/m4/linkat.m4 | 47 |
2 files changed, 47 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 4fc10daa05477586fea99b6b3ca02a87d1102fa diff --git a/gnulib/m4/linkat.m4 b/gnulib/m4/linkat.m4 new file mode 100644 index 00000000..630ce890 --- /dev/null +++ b/gnulib/m4/linkat.m4 @@ -0,0 +1,47 @@ +# serial 2 +# See if we need to provide linkat replacement. + +dnl Copyright (C) 2009-2010 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +# Written by Eric Blake. + +AC_DEFUN([gl_FUNC_LINKAT], +[ + AC_REQUIRE([gl_FUNC_OPENAT]) + AC_REQUIRE([gl_FUNC_LINK]) + AC_REQUIRE([gl_FUNC_LINK_FOLLOWS_SYMLINK]) + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + AC_CHECK_FUNCS_ONCE([linkat symlink]) + AC_CHECK_HEADERS_ONCE([sys/param.h]) + if test $ac_cv_func_linkat = no; then + HAVE_LINKAT=0 + AC_LIBOBJ([linkat]) + AC_LIBOBJ([at-func2]) + else + AC_CACHE_CHECK([whether linkat(,AT_SYMLINK_FOLLOW) works], + [gl_cv_func_linkat_follow], + [rm -rf conftest.f1 conftest.f2 + touch conftest.f1 + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ +#include <fcntl.h> +#include <unistd.h> +#ifdef __linux__ +/* Linux added linkat in 2.6.16, but did not add AT_SYMLINK_FOLLOW + until 2.6.18. Always replace linkat to support older kernels. */ +choke me +#endif +]], [return linkat (AT_FDCWD, "conftest.f1", AT_FDCWD, "conftest.f2", + AT_SYMLINK_FOLLOW);])], + [gl_cv_func_linkat_follow=yes], + [gl_cv_func_linkat_follow="need runtime check"]) + rm -rf conftest.f1 conftest.f2]) + if test "$gl_cv_func_linkat_follow" != yes; then + REPLACE_LINKAT=1 + AC_LIBOBJ([linkat]) + fi + fi +]) |