kc3-lang/gnulib/m4/strerror_r.m4

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• Hash : 11525f62
  Author :
  Date : 2023-01-22T14:11:49
  

  Resolve conflicts for functions introduced in Android API level 23.
  
  * m4/strerror_r.m4 (gl_FUNC_STRERROR_R_WORKS): Conditionally set
  REPLACE_STRERROR_R.
  * lib/string.in.h (strerror_r): Disable _GL_CXXALIASWARN invocation on
  non-glibc systems.
  

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• m4/strerror_r.m4

• # strerror_r.m4 serial 26
  dnl Copyright (C) 2002, 2007-2023 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
  
  AC_DEFUN([gl_FUNC_STRERROR_R],
  [
    AC_REQUIRE([gl_STRING_H_DEFAULTS])
    AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
  
    dnl Some systems don't declare strerror_r() if _THREAD_SAFE and _REENTRANT
    dnl are not defined.
    AC_CHECK_DECLS_ONCE([strerror_r])
    if test $ac_cv_have_decl_strerror_r = no; then
      HAVE_DECL_STRERROR_R=0
    fi
  
    if test $ac_cv_func_strerror_r = yes; then
      if test "$GL_GENERATE_ERRNO_H:$REPLACE_STRERROR_0" = false:0; then
        if test $gl_cv_func_strerror_r_posix_signature = yes; then
          case "$gl_cv_func_strerror_r_works" in
            dnl The system's strerror_r has bugs.  Replace it.
            *no) REPLACE_STRERROR_R=1 ;;
          esac
        else
          dnl The system's strerror_r() has a wrong signature. Replace it.
          REPLACE_STRERROR_R=1
        fi
      else
        dnl The system's strerror_r() cannot know about the new errno values we
        dnl add to <errno.h>, or any fix for strerror(0). Replace it.
        REPLACE_STRERROR_R=1
      fi
    fi
  ])
  
  # Prerequisites of lib/strerror_r.c.
  AC_DEFUN([gl_PREREQ_STRERROR_R], [
    AC_REQUIRE([AC_FUNC_STRERROR_R])
    dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
    AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
    gl_CHECK_FUNCS_ANDROID([catgets], [[#include <nl_types.h>]])
    AC_CHECK_FUNCS_ONCE([snprintf])
  ])
  
  # Detect if strerror_r works, but without affecting whether a replacement
  # strerror_r will be used.
  AC_DEFUN([gl_FUNC_STRERROR_R_WORKS],
  [
    AC_REQUIRE([gl_HEADER_ERRNO_H])
    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  
    dnl Persuade Android <string.h> to use the GNU strerror_r API,
    dnl and Solaris <string.h> to declare strerror_r.
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  
    AC_REQUIRE([gl_FUNC_STRERROR_0])
  
    gl_CHECK_FUNCS_ANDROID([strerror_r], [[#include <string.h>]])
    if test $ac_cv_func_strerror_r = yes; then
      if test "$GL_GENERATE_ERRNO_H:$REPLACE_STRERROR_0" = false:0; then
        dnl The POSIX prototype is:  int strerror_r (int, char *, size_t);
        dnl glibc, Cygwin:           char *strerror_r (int, char *, size_t);
        dnl AIX 5.1, OSF/1 5.1:      int strerror_r (int, char *, int);
        AC_CACHE_CHECK([for strerror_r with POSIX signature],
          [gl_cv_func_strerror_r_posix_signature],
          [AC_COMPILE_IFELSE(
             [AC_LANG_PROGRAM(
                [[#include <string.h>
                  int strerror_r (int, char *, size_t);
                ]],
                [])],
             [gl_cv_func_strerror_r_posix_signature=yes],
             [gl_cv_func_strerror_r_posix_signature=no])
          ])
        if test $gl_cv_func_strerror_r_posix_signature = yes; then
          dnl AIX 6.1 strerror_r fails by returning -1, not an error number.
          dnl HP-UX 11.31 strerror_r always fails when the buffer length argument
          dnl is less than 80.
          dnl FreeBSD 8.s strerror_r claims failure on 0
          dnl Mac OS X 10.5 strerror_r treats 0 like -1
          dnl Solaris 10 strerror_r corrupts errno on failure
          AC_CACHE_CHECK([whether strerror_r works],
            [gl_cv_func_strerror_r_works],
            [AC_RUN_IFELSE(
               [AC_LANG_PROGRAM(
                  [[#include <errno.h>
                    #include <string.h>
                  ]],
                  [[int result = 0;
                    char buf[79];
                    if (strerror_r (EACCES, buf, 0) < 0)
                      result |= 1;
                    errno = 0;
                    if (strerror_r (EACCES, buf, sizeof buf) != 0)
                      result |= 2;
                    strcpy (buf, "Unknown");
                    if (strerror_r (0, buf, sizeof buf) != 0)
                      result |= 4;
                    if (errno)
                      result |= 8;
                    if (strstr (buf, "nknown") || strstr (buf, "ndefined"))
                      result |= 0x10;
                    errno = 0;
                    *buf = 0;
                    if (strerror_r (-3, buf, sizeof buf) < 0)
                      result |= 0x20;
                    if (errno)
                      result |= 0x40;
                    if (!*buf)
                      result |= 0x80;
                    return result;
                  ]])],
               [gl_cv_func_strerror_r_works=yes],
               [gl_cv_func_strerror_r_works=no],
               [
  changequote(,)dnl
                case "$host_os" in
                         # Guess no on AIX.
                  aix*)  gl_cv_func_strerror_r_works="guessing no";;
                         # Guess no on HP-UX.
                  hpux*) gl_cv_func_strerror_r_works="guessing no";;
                         # Guess no on BSD variants.
                  *bsd*)  gl_cv_func_strerror_r_works="guessing no";;
                         # Guess yes otherwise.
                  *)     gl_cv_func_strerror_r_works="guessing yes";;
                esac
  changequote([,])dnl
               ])
            ])
        else
          dnl The system's strerror() has a wrong signature.
          dnl glibc >= 2.3.4 and cygwin 1.7.9 have a function __xpg_strerror_r.
          AC_CHECK_FUNCS_ONCE([__xpg_strerror_r])
          dnl In glibc < 2.14, __xpg_strerror_r does not populate buf on failure.
          dnl In cygwin < 1.7.10, __xpg_strerror_r clobbers strerror's buffer.
          if test $ac_cv_func___xpg_strerror_r = yes; then
            AC_CACHE_CHECK([whether __xpg_strerror_r works],
              [gl_cv_func_strerror_r_works],
              [AC_RUN_IFELSE(
                 [AC_LANG_PROGRAM(
                    [[#include <errno.h>
                      #include <string.h>
                      extern
                      #ifdef __cplusplus
                      "C"
                      #endif
                      int __xpg_strerror_r(int, char *, size_t);
                    ]],
                    [[int result = 0;
                      char buf[256] = "^";
                      char copy[256];
                      char *str = strerror (-1);
                      strcpy (copy, str);
                      if (__xpg_strerror_r (-2, buf, 1) == 0)
                        result |= 1;
                      if (*buf)
                        result |= 2;
                      __xpg_strerror_r (-2, buf, 256);
                      if (strcmp (str, copy))
                        result |= 4;
                      return result;
                    ]])],
                 [gl_cv_func_strerror_r_works=yes],
                 [gl_cv_func_strerror_r_works=no],
                 [dnl Guess no on all platforms that have __xpg_strerror_r,
                  dnl at least until fixed glibc and cygwin are more common.
                  gl_cv_func_strerror_r_works="$gl_cross_guess_normal"
                 ])
              ])
          fi
        fi
      fi
    else
      case "$gl_cv_onwards_func_strerror_r" in
        future*) REPLACE_STRERROR_R=1 ;;
      esac
    fi
  ])
  

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