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Chet Ramey
28 lines
805 B
Plaintext
28 lines
805 B
Plaintext
# Check for bool that conforms to C2023.
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dnl Copyright 2022-2024 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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AC_DEFUN([gl_C_BOOL],
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[
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AC_CACHE_CHECK([for bool, true, false], [gl_cv_c_bool],
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[AC_COMPILE_IFELSE(
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[AC_LANG_SOURCE([[
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#if true == false
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#error "true == false"
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#endif
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extern bool b;
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bool b = true == false;]])],
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[gl_cv_c_bool=yes],
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[gl_cv_c_bool=no])])
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if test "$gl_cv_c_bool" = yes; then
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AC_DEFINE([HAVE_C_BOOL], [1],
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[Define to 1 if bool, true and false work as per C2023.])
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fi
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AC_CHECK_HEADERS_ONCE([stdbool.h])
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])
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