diff options
Diffstat (limited to 'm4/link.m4')
| -rw-r--r-- | m4/link.m4 | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/m4/link.m4 b/m4/link.m4 new file mode 100644 index 00000000..479083cb --- /dev/null +++ b/m4/link.m4 @@ -0,0 +1,43 @@ +# link.m4 serial 5 +dnl Copyright (C) 2009-2011 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. + +AC_DEFUN([gl_FUNC_LINK], +[ + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_CHECK_FUNCS_ONCE([link]) + if test $ac_cv_func_link = no; then + HAVE_LINK=0 + AC_LIBOBJ([link]) + else + AC_CACHE_CHECK([whether link handles trailing slash correctly], + [gl_cv_func_link_works], + [touch conftest.a + # Assume that if we have lstat, we can also check symlinks. + if test $ac_cv_func_lstat = yes; then + ln -s conftest.a conftest.lnk + fi + AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[#include <unistd.h> + ]], + [[int result = 0; + if (!link ("conftest.a", "conftest.b/")) + result |= 1; +#if HAVE_LSTAT + if (!link ("conftest.lnk/", "conftest.b")) + result |= 2; +#endif + return result; + ]])], + [gl_cv_func_link_works=yes], [gl_cv_func_link_works=no], + [gl_cv_func_link_works="guessing no"]) + rm -f conftest.a conftest.b conftest.lnk]) + if test "$gl_cv_func_link_works" != yes; then + REPLACE_LINK=1 + AC_LIBOBJ([link]) + fi + fi +]) |