/* Test bool. Copyright (C) 2002-2007, 2009-2024 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ /* Written by Bruno Haible , 2007. */ /* Define ADDRESS_CHECK_OKAY if it is OK to assign an address to a 'bool' and this does not generate a warning (because we want this test to succeed even when using gcc's -Werror). */ #if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) \ || (__clang_major__ >= 4) /* We can silence the warning. */ # pragma GCC diagnostic ignored "-Waddress" # define ADDRESS_CHECK_OKAY #elif defined __GNUC__ || defined __clang__ /* There may be a warning. */ #else /* Ignore warnings from other compilers. */ # define ADDRESS_CHECK_OKAY #endif #include #ifdef TEST_STDBOOL_H # include #endif #if false "error: false is not 0" #endif #if true != 1 "error: true is not 1" #endif /* Several tests cannot be guaranteed with gnulib's , at least, not for all compilers and compiler options. */ #if ((HAVE_C_BOOL || defined __cplusplus \ || HAVE_STDBOOL_H || 3 <= __GNUC__ || 4 <= __clang_major__) \ && !(defined _MSC_VER || defined __SUNPRO_C)) # define WORKING_BOOL 1 #else # define WORKING_BOOL 0 #endif #if WORKING_BOOL struct s { bool s: 1; bool t; } s; #endif char a[true == 1 ? 1 : -1]; char b[false == 0 ? 1 : -1]; #if WORKING_BOOL char d[(bool) 0.5 == true ? 1 : -1]; # ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning. */ /* C99 may plausibly be interpreted as not requiring support for a cast from a variable's address to bool in a static initializer. So treat it like a GCC extension. */ # if defined __GNUC__ || defined __clang__ bool e = &s; # endif # endif char f[(bool) 0.0 == false ? 1 : -1]; #endif char g[true]; char h[sizeof (bool)]; #if WORKING_BOOL char i[sizeof s.t]; #endif enum { j = false, k = true, l = false * true, m = true * 256 }; bool n[m]; char o[sizeof n == m * sizeof n[0] ? 1 : -1]; char p[-1 - (bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; /* Catch a bug in an HP-UX C compiler. See https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html */ bool q = true; bool *pq = &q; int main () { int error = 0; #if WORKING_BOOL # ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning. */ /* A cast from a variable's address to bool is valid in expressions. */ { bool e1 = &s; if (!e1) error = 1; } # endif #endif /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0 reported by James Lemley on 2005-10-05; see https://lists.gnu.org/r/bug-coreutils/2005-10/msg00086.html This is a runtime test, since a corresponding compile-time test would rely on initializer extensions. */ { char digs[] = "0123456789"; if (&(digs + 5)[-2 + (bool) 1] != &digs[4]) error = 1; } return error; }