kc3-lang/gnulib/m4/ffs.m4

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• Hash : 0ff4d2d5
  Author :
  Date : 2023-01-03T19:48:59
  

  ffs: Document Android problem.
  
  * doc/posix-functions/ffs.texi: Mention Android problem.
  * m4/ffs.m4: Update comment.
  

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• m4/ffs.m4

• # ffs.m4 serial 6
  dnl Copyright (C) 2011-2023 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_FFS],
  [
    AC_REQUIRE([gl_STRINGS_H_DEFAULTS])
  
    dnl We can't use AC_CHECK_FUNC here, because ffs() is defined as a
    dnl static inline function when compiling for Android 13 or older.
    dnl But require that ffs() is declared; otherwise we may be using
    dnl the GCC built-in function, which leads to warnings
    dnl "warning: implicit declaration of function 'ffs'".
    AC_CACHE_CHECK([for ffs], [gl_cv_func_ffs],
      [AC_LINK_IFELSE(
         [AC_LANG_PROGRAM(
            [[#include <strings.h>
              int x;
            ]],
            [[int (*func) (int) = ffs;
              return func (x);
            ]])
         ],
         [gl_cv_func_ffs=yes],
         [gl_cv_func_ffs=no])
      ])
    if test $gl_cv_func_ffs = no; then
      HAVE_FFS=0
    fi
  ])
  

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