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| 1 | #serial 4
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| 2 |
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| 3 | dnl From Paul Eggert.
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| 4 |
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| 5 | AC_DEFUN([AC_C_BACKSLASH_A],
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| 6 | [
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| 7 | AC_CACHE_CHECK([whether backslash-a works in strings], ac_cv_c_backslash_a,
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| 8 | [AC_TRY_COMPILE([],
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| 9 | [
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| 10 | #if '\a' == 'a'
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| 11 | syntax error;
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| 12 | #endif
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| 13 | char buf['\a' == 'a' ? -1 : 1];
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| 14 | buf[0] = '\a';
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| 15 | return buf[0] != "\a"[0];
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| 16 | ],
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| 17 | ac_cv_c_backslash_a=yes,
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| 18 | ac_cv_c_backslash_a=no)])
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| 19 | if test $ac_cv_c_backslash_a = yes; then
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| 20 | AC_DEFINE(HAVE_C_BACKSLASH_A, 1,
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| 21 | [Define if backslash-a works in C strings.])
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| 22 | fi
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| 23 | ])
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