Blame gl/m4/func.m4

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# func.m4 serial 2
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dnl Copyright (C) 2008-2016 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Written by Simon Josefsson
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AC_DEFUN([gl_FUNC],
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[
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  AC_CACHE_CHECK([whether __func__ is available], [gl_cv_var_func],
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     AC_COMPILE_IFELSE(
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       [AC_LANG_PROGRAM([[]], [[const char *str = __func__;]])],
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       [gl_cv_var_func=yes],
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       [gl_cv_var_func=no]))
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  if test "$gl_cv_var_func" != yes; then
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    AC_DEFINE([__func__], ["<unknown function>"],
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              [Define as a replacement for the ISO C99 __func__ variable.])
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  fi
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])