HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| 8912421c | 1 | # readlink.m4 serial 7 |
| ffca4c22 AW |
2 | dnl Copyright (C) 2003, 2007, 2009 Free Software Foundation, Inc. |
| 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]) | |
| 10 | AC_CHECK_FUNCS_ONCE([readlink]) | |
| 11 | if test $ac_cv_func_readlink = no; then | |
| 12 | HAVE_READLINK=0 | |
| 13 | AC_LIBOBJ([readlink]) | |
| 14 | gl_PREREQ_READLINK | |
| 8912421c LC |
15 | else |
| 16 | AC_CACHE_CHECK([whether readlink signature is correct], | |
| 17 | [gl_cv_decl_readlink_works], | |
| 18 | [AC_COMPILE_IFELSE( | |
| 19 | [AC_LANG_PROGRAM( | |
| 20 | [[#include <unistd.h> | |
| 21 | /* Cause compilation failure if original declaration has wrong type. */ | |
| 22 | ssize_t readlink (const char *, char *, size_t);]])], | |
| 23 | [gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])]) | |
| 24 | AC_CACHE_CHECK([whether readlink handles trailing slash correctly], | |
| 25 | [gl_cv_func_readlink_works], | |
| 26 | [# We have readlink, so assume ln -s works. | |
| 27 | ln -s conftest.no-such conftest.link | |
| 28 | AC_RUN_IFELSE( | |
| 29 | [AC_LANG_PROGRAM( | |
| 30 | [[#include <unistd.h> | |
| 31 | ]], [[char buf[20]; | |
| 32 | return readlink ("conftest.link/", buf, sizeof buf) != -1;]])], | |
| 33 | [gl_cv_func_readlink_works=yes], [gl_cv_func_readlink_works=no], | |
| 34 | [gl_cv_func_readlink_works="guessing no"]) | |
| 35 | rm -f conftest.link]) | |
| 36 | if test "$gl_cv_func_readlink_works" != yes; then | |
| 37 | AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink | |
| 38 | fails to recognize a trailing slash.]) | |
| 39 | REPLACE_READLINK=1 | |
| 40 | AC_LIBOBJ([readlink]) | |
| 41 | elif test "$gl_cv_decl_readlink_works" != yes; then | |
| 42 | REPLACE_READLINK=1 | |
| 43 | AC_LIBOBJ([readlink]) | |
| 44 | fi | |
| ffca4c22 AW |
45 | fi |
| 46 | ]) | |
| 47 | ||
| 48 | # Like gl_FUNC_READLINK, except prepare for separate compilation (no AC_LIBOBJ). | |
| 49 | AC_DEFUN([gl_FUNC_READLINK_SEPARATE], | |
| 50 | [ | |
| 51 | AC_CHECK_FUNCS_ONCE([readlink]) | |
| 52 | gl_PREREQ_READLINK | |
| 53 | ]) | |
| 54 | ||
| 55 | # Prerequisites of lib/readlink.c. | |
| 56 | AC_DEFUN([gl_PREREQ_READLINK], | |
| 57 | [ | |
| 58 | : | |
| 59 | ]) |