diff options
Diffstat (limited to 'm4/lstat.m4')
| -rw-r--r-- | m4/lstat.m4 | 66 |
1 files changed, 60 insertions, 6 deletions
diff --git a/m4/lstat.m4 b/m4/lstat.m4 index b9777a6..e143d5c 100644 --- a/m4/lstat.m4 +++ b/m4/lstat.m4 @@ -1,7 +1,6 @@ -#serial 16 +# serial 27 -# Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007 -# Free Software Foundation, Inc. +# Copyright (C) 1997-2001, 2003-2016 Free Software Foundation, Inc. # # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, @@ -11,7 +10,62 @@ dnl From Jim Meyering. AC_DEFUN([gl_FUNC_LSTAT], [ - AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK - dnl Note: AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK does AC_LIBOBJ(lstat). - : + AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS]) + dnl If lstat does not exist, the replacement <sys/stat.h> does + dnl "#define lstat stat", and lstat.c is a no-op. + AC_CHECK_FUNCS_ONCE([lstat]) + if test $ac_cv_func_lstat = yes; then + AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK]) + case "$gl_cv_func_lstat_dereferences_slashed_symlink" in + *no) + REPLACE_LSTAT=1 + ;; + esac + else + HAVE_LSTAT=0 + fi +]) + +# Prerequisites of lib/lstat.c. +AC_DEFUN([gl_PREREQ_LSTAT], [:]) + +AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK], +[ + dnl We don't use AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK any more, because it + dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ. + AC_CACHE_CHECK([whether lstat correctly handles trailing slash], + [gl_cv_func_lstat_dereferences_slashed_symlink], + [rm -f conftest.sym conftest.file + echo >conftest.file + AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [AC_INCLUDES_DEFAULT], + [[struct stat sbuf; + if (symlink ("conftest.file", "conftest.sym") != 0) + return 1; + /* Linux will dereference the symlink and fail, as required by + POSIX. That is better in the sense that it means we will not + have to compile and use the lstat wrapper. */ + return lstat ("conftest.sym/", &sbuf) == 0; + ]])], + [gl_cv_func_lstat_dereferences_slashed_symlink=yes], + [gl_cv_func_lstat_dereferences_slashed_symlink=no], + [case "$host_os" in + *-gnu*) + # Guess yes on glibc systems. + gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; + *) + # If we don't know, assume the worst. + gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;; + esac + ]) + rm -f conftest.sym conftest.file + ]) + case "$gl_cv_func_lstat_dereferences_slashed_symlink" in + *yes) + AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1], + [Define to 1 if 'lstat' dereferences a symlink specified + with a trailing slash.]) + ;; + esac ]) |