configurator: fix bitshift tests (-fsanitize=undefined)

[ccan] / tools / configurator / configurator.c

diff --git a/tools/configurator/configurator.c b/tools/configurator/configurator.c
index f830cbca14eb3eb3a2f4070fc6564674a0428d2d..722a6f6928834e8e2df647bddbb28d96b59d5a83 100644 (file)
--- a/tools/configurator/configurator.c
+++ b/tools/configurator/configurator.c
@@ -197,7 +197,7 @@ static const struct test base_tests[] = {
          "return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;" },
        { "HAVE_BUILTIN_CTZ", "__builtin_ctz support",
          "INSIDE_MAIN", NULL, NULL,
-         "return __builtin_ctz(1 << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
+         "return __builtin_ctz(1U << (sizeof(int)*8 - 1)) == (sizeof(int)*8 - 1) ? 0 : 1;" },
        { "HAVE_BUILTIN_CTZL", "__builtin_ctzl support",
          "INSIDE_MAIN", NULL, NULL,
          "return __builtin_ctzl(1UL << (sizeof(long)*8 - 1)) == (sizeof(long)*8 - 1) ? 0 : 1;" },