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Annotation of embedaddon/libiconv/srcm4/readlink.m4, revision 1.1.1.3

1.1.1.3 ! misho       1: # readlink.m4 serial 14
        !             2: dnl Copyright (C) 2003, 2007, 2009-2019 Free Software Foundation, Inc.
1.1       misho       3: dnl This file is free software; the Free Software Foundation
                      4: dnl gives unlimited permission to copy and/or distribute it,
                      5: dnl with or without modifications, as long as this notice is preserved.
                      6: 
                      7: AC_DEFUN([gl_FUNC_READLINK],
                      8: [
                      9:   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
1.1.1.3 ! misho      10:   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1.1       misho      11:   AC_CHECK_FUNCS_ONCE([readlink])
                     12:   if test $ac_cv_func_readlink = no; then
                     13:     HAVE_READLINK=0
1.1.1.2   misho      14:   else
                     15:     AC_CACHE_CHECK([whether readlink signature is correct],
                     16:       [gl_cv_decl_readlink_works],
                     17:       [AC_COMPILE_IFELSE(
                     18:          [AC_LANG_PROGRAM(
                     19:            [[#include <unistd.h>
                     20:       /* Cause compilation failure if original declaration has wrong type.  */
                     21:       ssize_t readlink (const char *, char *, size_t);]])],
                     22:          [gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])])
                     23:     dnl Solaris 9 ignores trailing slash.
                     24:     dnl FreeBSD 7.2 dereferences only one level of links with trailing slash.
                     25:     AC_CACHE_CHECK([whether readlink handles trailing slash correctly],
                     26:       [gl_cv_func_readlink_works],
                     27:       [# We have readlink, so assume ln -s works.
                     28:        ln -s conftest.no-such conftest.link
                     29:        ln -s conftest.link conftest.lnk2
                     30:        AC_RUN_IFELSE(
                     31:          [AC_LANG_PROGRAM(
                     32:            [[#include <unistd.h>
                     33: ]], [[char buf[20];
                     34:       return readlink ("conftest.lnk2/", buf, sizeof buf) != -1;]])],
                     35:          [gl_cv_func_readlink_works=yes], [gl_cv_func_readlink_works=no],
1.1.1.3 ! misho      36:          [case "$host_os" in
        !            37:                              # Guess yes on Linux systems.
        !            38:             linux-* | linux) gl_cv_func_readlink_works="guessing yes" ;;
        !            39:                              # Guess yes on glibc systems.
        !            40:             *-gnu* | gnu*)   gl_cv_func_readlink_works="guessing yes" ;;
        !            41:                              # If we don't know, assume the worst.
        !            42:             *)               gl_cv_func_readlink_works="guessing no" ;;
        !            43:           esac
        !            44:          ])
1.1.1.2   misho      45:       rm -f conftest.link conftest.lnk2])
1.1.1.3 ! misho      46:     case "$gl_cv_func_readlink_works" in
        !            47:       *yes)
        !            48:         if test "$gl_cv_decl_readlink_works" != yes; then
        !            49:           REPLACE_READLINK=1
        !            50:         fi
        !            51:         ;;
        !            52:       *)
        !            53:         AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink
        !            54:           fails to recognize a trailing slash.])
        !            55:         REPLACE_READLINK=1
        !            56:         ;;
        !            57:     esac
1.1       misho      58:   fi
                     59: ])
                     60: 
1.1.1.2   misho      61: # Like gl_FUNC_READLINK, except prepare for separate compilation
                     62: # (no REPLACE_READLINK, no AC_LIBOBJ).
1.1       misho      63: AC_DEFUN([gl_FUNC_READLINK_SEPARATE],
                     64: [
                     65:   AC_CHECK_FUNCS_ONCE([readlink])
                     66:   gl_PREREQ_READLINK
                     67: ])
                     68: 
                     69: # Prerequisites of lib/readlink.c.
                     70: AC_DEFUN([gl_PREREQ_READLINK],
                     71: [
                     72:   :
                     73: ])