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5e8754f9 SDJ |
1 | # strerror.m4 serial 17 |
2 | dnl Copyright (C) 2002, 2007-2016 Free Software Foundation, Inc. | |
6ec2e0f5 SDJ |
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_STRERROR], | |
8 | [ | |
9 | AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) | |
10 | AC_REQUIRE([gl_HEADER_ERRNO_H]) | |
11 | AC_REQUIRE([gl_FUNC_STRERROR_0]) | |
12 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
13 | m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [ | |
14 | AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS]) | |
15 | ]) | |
16 | if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then | |
17 | AC_CACHE_CHECK([for working strerror function], | |
18 | [gl_cv_func_working_strerror], | |
19 | [AC_RUN_IFELSE( | |
20 | [AC_LANG_PROGRAM( | |
21 | [[#include <string.h> | |
22 | ]], | |
23 | [[if (!*strerror (-2)) return 1;]])], | |
24 | [gl_cv_func_working_strerror=yes], | |
25 | [gl_cv_func_working_strerror=no], | |
26 | [case "$host_os" in | |
5e8754f9 SDJ |
27 | # Guess yes on glibc systems. |
28 | *-gnu*) gl_cv_func_working_strerror="guessing yes" ;; | |
29 | # If we don't know, assume the worst. | |
30 | *) gl_cv_func_working_strerror="guessing no" ;; | |
6ec2e0f5 SDJ |
31 | esac |
32 | ]) | |
33 | ]) | |
34 | case "$gl_cv_func_working_strerror" in | |
35 | *yes) ;; | |
36 | *) | |
37 | dnl The system's strerror() fails to return a string for out-of-range | |
38 | dnl integers. Replace it. | |
39 | REPLACE_STRERROR=1 | |
40 | ;; | |
41 | esac | |
42 | m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [ | |
43 | dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's | |
44 | dnl buffer, we must replace strerror. | |
45 | case "$gl_cv_func_strerror_r_works" in | |
46 | *no) REPLACE_STRERROR=1 ;; | |
47 | esac | |
48 | ]) | |
49 | else | |
50 | dnl The system's strerror() cannot know about the new errno values we add | |
51 | dnl to <errno.h>, or any fix for strerror(0). Replace it. | |
52 | REPLACE_STRERROR=1 | |
53 | fi | |
54 | ]) | |
55 | ||
56 | dnl Detect if strerror(0) passes (that is, does not set errno, and does not | |
57 | dnl return a string that matches strerror(-1)). | |
58 | AC_DEFUN([gl_FUNC_STRERROR_0], | |
59 | [ | |
60 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
61 | REPLACE_STRERROR_0=0 | |
62 | AC_CACHE_CHECK([whether strerror(0) succeeds], | |
63 | [gl_cv_func_strerror_0_works], | |
64 | [AC_RUN_IFELSE( | |
65 | [AC_LANG_PROGRAM( | |
66 | [[#include <string.h> | |
67 | #include <errno.h> | |
68 | ]], | |
69 | [[int result = 0; | |
70 | char *str; | |
71 | errno = 0; | |
72 | str = strerror (0); | |
73 | if (!*str) result |= 1; | |
74 | if (errno) result |= 2; | |
75 | if (strstr (str, "nknown") || strstr (str, "ndefined")) | |
76 | result |= 4; | |
77 | return result;]])], | |
78 | [gl_cv_func_strerror_0_works=yes], | |
79 | [gl_cv_func_strerror_0_works=no], | |
80 | [case "$host_os" in | |
5e8754f9 SDJ |
81 | # Guess yes on glibc systems. |
82 | *-gnu*) gl_cv_func_strerror_0_works="guessing yes" ;; | |
83 | # If we don't know, assume the worst. | |
84 | *) gl_cv_func_strerror_0_works="guessing no" ;; | |
6ec2e0f5 SDJ |
85 | esac |
86 | ]) | |
87 | ]) | |
88 | case "$gl_cv_func_strerror_0_works" in | |
89 | *yes) ;; | |
90 | *) | |
91 | REPLACE_STRERROR_0=1 | |
92 | AC_DEFINE([REPLACE_STRERROR_0], [1], [Define to 1 if strerror(0) | |
93 | does not return a message implying success.]) | |
94 | ;; | |
95 | esac | |
96 | ]) |