diff options
Diffstat (limited to 'ltdl/m4/readlink.m4')
-rwxr-xr-x | ltdl/m4/readlink.m4 | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/ltdl/m4/readlink.m4 b/ltdl/m4/readlink.m4 new file mode 100755 index 00000000..36cd41f9 --- /dev/null +++ b/ltdl/m4/readlink.m4 @@ -0,0 +1,62 @@ +# readlink.m4 serial 9 +dnl Copyright (C) 2003, 2007, 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. + +AC_DEFUN([gl_FUNC_READLINK], +[ + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_CHECK_FUNCS_ONCE([readlink]) + if test $ac_cv_func_readlink = no; then + HAVE_READLINK=0 + AC_LIBOBJ([readlink]) + gl_PREREQ_READLINK + else + AC_CACHE_CHECK([whether readlink signature is correct], + [gl_cv_decl_readlink_works], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <unistd.h> + /* Cause compilation failure if original declaration has wrong type. */ + ssize_t readlink (const char *, char *, size_t);]])], + [gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])]) + dnl Solaris 9 ignores trailing slash. + dnl FreeBSD 7.2 dereferences only one level of links with trailing slash. + AC_CACHE_CHECK([whether readlink handles trailing slash correctly], + [gl_cv_func_readlink_works], + [# We have readlink, so assume ln -s works. + ln -s conftest.no-such conftest.link + ln -s conftest.link conftest.lnk2 + AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[#include <unistd.h> +]], [[char buf[20]; + return readlink ("conftest.lnk2/", buf, sizeof buf) != -1;]])], + [gl_cv_func_readlink_works=yes], [gl_cv_func_readlink_works=no], + [gl_cv_func_readlink_works="guessing no"]) + rm -f conftest.link conftest.lnk2]) + if test "$gl_cv_func_readlink_works" != yes; then + AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink + fails to recognize a trailing slash.]) + REPLACE_READLINK=1 + AC_LIBOBJ([readlink]) + elif test "$gl_cv_decl_readlink_works" != yes; then + REPLACE_READLINK=1 + AC_LIBOBJ([readlink]) + fi + fi +]) + +# Like gl_FUNC_READLINK, except prepare for separate compilation (no AC_LIBOBJ). +AC_DEFUN([gl_FUNC_READLINK_SEPARATE], +[ + AC_CHECK_FUNCS_ONCE([readlink]) + gl_PREREQ_READLINK +]) + +# Prerequisites of lib/readlink.c. +AC_DEFUN([gl_PREREQ_READLINK], +[ + : +]) |