projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 9c9d63b1 PM |
1 | # readlink.m4 serial 16 |
| 2 | dnl Copyright (C) 2003, 2007, 2009-2021 Free Software Foundation, Inc. | |
| 2196f55f YQ |
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_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
| 11 | AC_CHECK_FUNCS_ONCE([readlink]) | |
| 12 | if test $ac_cv_func_readlink = no; then | |
| 13 | HAVE_READLINK=0 | |
| 14 | else | |
| 15 | AC_CACHE_CHECK([whether readlink signature is correct], | |
| 16 | [gl_cv_decl_readlink_works], | |
| 17 | [AC_COMPILE_IFELSE( | |
| 18 | [AC_LANG_PROGRAM( | |
| 19 | [[#include <unistd.h> | |
| 20 | /* Cause compilation failure if original declaration has wrong type. */ | |
| 21 | ssize_t readlink (const char *, char *, size_t);]])], | |
| 22 | [gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])]) | |
| 23 | dnl Solaris 9 ignores trailing slash. | |
| 24 | dnl FreeBSD 7.2 dereferences only one level of links with trailing slash. | |
| 25 | AC_CACHE_CHECK([whether readlink handles trailing slash correctly], | |
| 9c9d63b1 | 26 | [gl_cv_func_readlink_trailing_slash], |
| 2196f55f YQ |
27 | [# We have readlink, so assume ln -s works. |
| 28 | ln -s conftest.no-such conftest.link | |
| 29 | ln -s conftest.link conftest.lnk2 | |
| 30 | AC_RUN_IFELSE( | |
| 31 | [AC_LANG_PROGRAM( | |
| 32 | [[#include <unistd.h> | |
| 33 | ]], [[char buf[20]; | |
| 34 | return readlink ("conftest.lnk2/", buf, sizeof buf) != -1;]])], | |
| 9c9d63b1 PM |
35 | [gl_cv_func_readlink_trailing_slash=yes], |
| 36 | [gl_cv_func_readlink_trailing_slash=no], | |
| 2196f55f | 37 | [case "$host_os" in |
| 9c9d63b1 PM |
38 | # Guess yes on Linux or glibc systems. |
| 39 | linux-* | linux | *-gnu* | gnu*) | |
| 40 | gl_cv_func_readlink_trailing_slash="guessing yes" ;; | |
| 41 | # Guess no on AIX or HP-UX. | |
| 42 | aix* | hpux*) | |
| 43 | gl_cv_func_readlink_trailing_slash="guessing no" ;; | |
| 44 | # If we don't know, obey --enable-cross-guesses. | |
| 45 | *) | |
| 46 | gl_cv_func_readlink_trailing_slash="$gl_cross_guess_normal" ;; | |
| 2196f55f YQ |
47 | esac |
| 48 | ]) | |
| 49 | rm -f conftest.link conftest.lnk2]) | |
| 9c9d63b1 | 50 | case "$gl_cv_func_readlink_trailing_slash" in |
| 2196f55f YQ |
51 | *yes) |
| 52 | if test "$gl_cv_decl_readlink_works" != yes; then | |
| 53 | REPLACE_READLINK=1 | |
| 54 | fi | |
| 55 | ;; | |
| 56 | *) | |
| 57 | AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink | |
| 58 | fails to recognize a trailing slash.]) | |
| 59 | REPLACE_READLINK=1 | |
| 60 | ;; | |
| 61 | esac | |
| 9c9d63b1 PM |
62 | |
| 63 | AC_CACHE_CHECK([whether readlink truncates results correctly], | |
| 64 | [gl_cv_func_readlink_truncate], | |
| 65 | [# We have readlink, so assume ln -s works. | |
| 66 | ln -s ab conftest.link | |
| 67 | AC_RUN_IFELSE( | |
| 68 | [AC_LANG_PROGRAM( | |
| 69 | [[#include <unistd.h> | |
| 70 | ]], [[char c; | |
| 71 | return readlink ("conftest.link", &c, 1) != 1;]])], | |
| 72 | [gl_cv_func_readlink_truncate=yes], | |
| 73 | [gl_cv_func_readlink_truncate=no], | |
| 74 | [case "$host_os" in | |
| 75 | # Guess yes on Linux or glibc systems. | |
| 76 | linux-* | linux | *-gnu* | gnu*) | |
| 77 | gl_cv_func_readlink_truncate="guessing yes" ;; | |
| 78 | # Guess no on AIX or HP-UX. | |
| 79 | aix* | hpux*) | |
| 80 | gl_cv_func_readlink_truncate="guessing no" ;; | |
| 81 | # If we don't know, obey --enable-cross-guesses. | |
| 82 | *) | |
| 83 | gl_cv_func_readlink_truncate="$gl_cross_guess_normal" ;; | |
| 84 | esac | |
| 85 | ]) | |
| 86 | rm -f conftest.link conftest.lnk2]) | |
| 87 | case $gl_cv_func_readlink_truncate in | |
| 88 | *yes) | |
| 89 | if test "$gl_cv_decl_readlink_works" != yes; then | |
| 90 | REPLACE_READLINK=1 | |
| 91 | fi | |
| 92 | ;; | |
| 93 | *) | |
| 94 | AC_DEFINE([READLINK_TRUNCATE_BUG], [1], [Define to 1 if readlink | |
| 95 | sets errno instead of truncating a too-long link.]) | |
| 96 | REPLACE_READLINK=1 | |
| 97 | ;; | |
| 98 | esac | |
| 2196f55f YQ |
99 | fi |
| 100 | ]) | |
| 101 | ||
| 102 | # Like gl_FUNC_READLINK, except prepare for separate compilation | |
| 103 | # (no REPLACE_READLINK, no AC_LIBOBJ). | |
| 104 | AC_DEFUN([gl_FUNC_READLINK_SEPARATE], | |
| 105 | [ | |
| 106 | AC_CHECK_FUNCS_ONCE([readlink]) | |
| 107 | gl_PREREQ_READLINK | |
| 108 | ]) | |
| 109 | ||
| 110 | # Prerequisites of lib/readlink.c. | |
| 111 | AC_DEFUN([gl_PREREQ_READLINK], | |
| 112 | [ | |
| 113 | : | |
| 114 | ]) |