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((test) ? puts (#test) : printf (__VA_ARGS__)) static void test_varargs_macros (void) { int x = 1234; int y = 5678; debug ("Flag"); debug ("X = %d\n", x); showlist (The first, second, and third items.); report (x>y, "x is %d but y is %d", x, y); } // Check long long types. #define BIG64 18446744073709551615ull #define BIG32 4294967295ul #define BIG_OK (BIG64 / BIG32 == 4294967297ull && BIG64 % BIG32 == 0) #if !BIG_OK your preprocessor is broken; #endif #if BIG_OK #else your preprocessor is broken; #endif static long long int bignum = -9223372036854775807LL; static unsigned long long int ubignum = BIG64; struct incomplete_array { int datasize; double data[]; }; struct named_init { int number; const wchar_t *name; double average; }; typedef const char *ccp; static inline int test_restrict (ccp restrict text) { // See if C++-style comments work. // Iterate through items via the restricted pointer. // Also check for declarations in for loops. for (unsigned int i = 0; *(text+i) != '\0'; ++i) continue; return 0; } // Check varargs and va_copy. static void test_varargs (const char *format, ...) { va_list args; va_start (args, format); va_list args_copy; va_copy (args_copy, args); const char *str; int number; float fnumber; while (*format) { switch (*format++) { case 's': // string str = va_arg (args_copy, const char *); break; case 'd': // int number = va_arg (args_copy, int); break; case 'f': // float fnumber = va_arg (args_copy, double); break; default: break; } } va_end (args_copy); va_end (args); } int main () { // Check bool. _Bool success = false; // Check restrict. if (test_restrict ("String literal") == 0) success = true; char *restrict newvar = "Another string"; // Check varargs. test_varargs ("s, d' f .", "string", 65, 34.234); test_varargs_macros (); // Check flexible array members. struct incomplete_array *ia = malloc (sizeof (struct incomplete_array) + (sizeof (double) * 10)); ia->datasize = 10; for (int i = 0; i < ia->datasize; ++i) ia->data[i] = i * 1.234; // Check named initializers. struct named_init ni = { .number = 34, .name = L"Test wide string", .average = 543.34343, }; ni.number = 58; int dynamic_array[ni.number]; dynamic_array[ni.number - 1] = 543; // work around unused variable warnings return (!success || bignum == 0LL || ubignum == 0uLL || newvar[0] == 'x' || dynamic_array[ni.number - 1] != 543); ; return 0; } _ACEOF for ac_arg in '' -std=gnu99 -std=c99 -c99 -AC99 -D_STDC_C99= -qlanglvl=extc99 do CC="$ac_save_CC $ac_arg" if ac_fn_c_try_compile "$LINENO"; then : ac_cv_prog_cc_c99=$ac_arg fi rm -f core conftest.err conftest.$ac_objext test "x$ac_cv_prog_cc_c99" != "xno" && break done rm -f conftest.$ac_ext CC=$ac_save_CC fi # AC_CACHE_VAL case "x$ac_cv_prog_cc_c99" in x) { $as_echo "$as_me:${as_lineno-$LINENO}: result: none needed" >&5 $as_echo "none needed" >&6; } ;; xno) { $as_echo "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5 $as_echo "unsupported" >&6; } ;; *) CC="$CC $ac_cv_prog_cc_c99" { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c99" >&5 $as_echo "$ac_cv_prog_cc_c99" >&6; } ;; esac if test "x$ac_cv_prog_cc_c99" != xno; then : ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c99 else { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO C89" >&5 $as_echo_n "checking for $CC option to accept ISO C89... 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" >&6; } if ${ax_cv_check_cflags___fPIE+:} false; then : $as_echo_n "(cached) " >&6 else ax_check_save_flags=$CFLAGS CFLAGS="$CFLAGS -fPIE" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ int main () { ; return 0; } _ACEOF if ac_fn_c_try_compile "$LINENO"; then : ax_cv_check_cflags___fPIE=yes else ax_cv_check_cflags___fPIE=no fi rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext CFLAGS=$ax_check_save_flags fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fPIE" >&5 $as_echo "$ax_cv_check_cflags___fPIE" >&6; } if test x"$ax_cv_check_cflags___fPIE" = xyes; then : CPPFLAGS="$CPPFLAGS -fPIE" else : fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the linker accepts -pie" >&5 $as_echo_n "checking whether the linker accepts -pie... " >&6; } if ${ax_cv_check_ldflags___pie+:} false; then : $as_echo_n "(cached) " >&6 else ax_check_save_flags=$LDFLAGS LDFLAGS="$LDFLAGS -pie" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ int main () { ; return 0; } _ACEOF if ac_fn_c_try_link "$LINENO"; then : ax_cv_check_ldflags___pie=yes else ax_cv_check_ldflags___pie=no fi rm -f core conftest.err conftest.$ac_objext \ conftest$ac_exeext conftest.$ac_ext LDFLAGS=$ax_check_save_flags fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_ldflags___pie" >&5 $as_echo "$ax_cv_check_ldflags___pie" >&6; } if test x"$ax_cv_check_ldflags___pie" = xyes; then : LDFLAGS="$LDFLAGS -pie" else : fi ;; esac { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the linker accepts -Wl,-z,relro" >&5 $as_echo_n "checking whether the linker accepts -Wl,-z,relro... 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" >&6; } if ${tinc_cv_attribute___nonnull__+:} false; then : $as_echo_n "(cached) " >&6 else tempcflags="$CFLAGS" CFLAGS="$CFLAGS -Wall -Werror" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ void *test(void *x) __attribute__ ((__nonnull__)); void *test(void *x) { return (void *)x; } _ACEOF if ac_fn_c_try_compile "$LINENO"; then : tinc_cv_attribute___nonnull__=yes else tinc_cv_attribute___nonnull__=no fi rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext CFLAGS="$tempcflags" fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $tinc_cv_attribute___nonnull__" >&5 $as_echo "$tinc_cv_attribute___nonnull__" >&6; } if test ${tinc_cv_attribute___nonnull__} = no; then $as_echo "#define __nonnull__ /**/" >>confdefs.h fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking for working __warn_unused_result__ attribute" >&5 $as_echo_n "checking for working __warn_unused_result__ attribute... " >&6; } if ${tinc_cv_attribute___warn_unused_result__+:} false; then : $as_echo_n "(cached) " >&6 else tempcflags="$CFLAGS" CFLAGS="$CFLAGS -Wall -Werror" cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ void *test(void *x) __attribute__ ((__warn_unused_result__)); void *test(void *x) { return (void *)x; } _ACEOF if ac_fn_c_try_compile "$LINENO"; then : tinc_cv_attribute___warn_unused_result__=yes else tinc_cv_attribute___warn_unused_result__=no fi rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext CFLAGS="$tempcflags" fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $tinc_cv_attribute___warn_unused_result__" >&5 $as_echo "$tinc_cv_attribute___warn_unused_result__" >&6; } if test ${tinc_cv_attribute___warn_unused_result__} = no; then $as_echo "#define __warn_unused_result__ /**/" >>confdefs.h fi ac_fn_c_check_type "$LINENO" "struct ether_header" "ac_cv_type_struct_ether_header" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_ether_header" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_ETHER_HEADER 1 _ACEOF fi ac_fn_c_check_type "$LINENO" "struct arphdr" "ac_cv_type_struct_arphdr" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_arphdr" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_ARPHDR 1 _ACEOF fi ac_fn_c_check_type "$LINENO" "struct ether_arp" "ac_cv_type_struct_ether_arp" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_ether_arp" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_ETHER_ARP 1 _ACEOF fi ac_fn_c_check_type "$LINENO" "struct ip" "ac_cv_type_struct_ip" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_ip" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_IP 1 _ACEOF fi ac_fn_c_check_type "$LINENO" "struct icmp" "ac_cv_type_struct_icmp" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_icmp" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_ICMP 1 _ACEOF fi ac_fn_c_check_type "$LINENO" "struct ip6_hdr" "ac_cv_type_struct_ip6_hdr" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_ip6_hdr" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_IP6_HDR 1 _ACEOF fi ac_fn_c_check_type "$LINENO" "struct icmp6_hdr" "ac_cv_type_struct_icmp6_hdr" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_icmp6_hdr" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_ICMP6_HDR 1 _ACEOF fi ac_fn_c_check_type "$LINENO" "struct nd_neighbor_solicit" "ac_cv_type_struct_nd_neighbor_solicit" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_nd_neighbor_solicit" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_ND_NEIGHBOR_SOLICIT 1 _ACEOF fi ac_fn_c_check_type "$LINENO" "struct nd_opt_hdr" "ac_cv_type_struct_nd_opt_hdr" "#include \"$srcdir/src/have.h\" " if test "x$ac_cv_type_struct_nd_opt_hdr" = xyes; then : cat >>confdefs.h <<_ACEOF #define HAVE_STRUCT_ND_OPT_HDR 1 _ACEOF fi for ac_func in asprintf daemon fchmod flock fork gettimeofday mlockall putenv recvmmsg strsignal nanosleep unsetenv vsyslog devname fdevname do : as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh` ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var" if eval test \"x\$"$as_ac_var"\" = x"yes"; then : cat >>confdefs.h <<_ACEOF #define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1 _ACEOF fi done ac_fn_c_check_func "$LINENO" "getopt_long" "ac_cv_func_getopt_long" if test "x$ac_cv_func_getopt_long" = xyes; then : getopt=true; $as_echo "#define HAVE_GETOPT_LONG 1" >>confdefs.h else getopt=false fi if test "$getopt" = true; then GETOPT_TRUE= GETOPT_FALSE='#' else GETOPT_TRUE='#' GETOPT_FALSE= fi ac_fn_c_check_decl "$LINENO" "res_init" "ac_cv_have_decl_res_init" " #include #include " if test "x$ac_cv_have_decl_res_init" = xyes; then : ac_have_decl=1 else ac_have_decl=0 fi cat >>confdefs.h <<_ACEOF #define HAVE_DECL_RES_INIT $ac_have_decl _ACEOF if test $ac_have_decl = 1; then : { $as_echo "$as_me:${as_lineno-$LINENO}: checking for res_init in -lresolv" >&5 $as_echo_n "checking for res_init in -lresolv... 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