The execution order of constructors in undefined and depends on the toolchain. While recent toolchains seems to have a stable order, it doesn't work for older ones and may also change at any time.

Stop validating the order and instead only validate that all constructors are executed.

Reported-by: Willy Tarreau w@1wt.eu Closes: https://lore.kernel.org/lkml/20250301110735.GA18621@1wt.eu/ Signed-off-by: Thomas Weißschuh linux@weissschuh.net --- tools/testing/selftests/nolibc/nolibc-test-linkage.c | 6 +++--- tools/testing/selftests/nolibc/nolibc-test.c | 8 ++++---- 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/nolibc/nolibc-test-linkage.c b/tools/testing/selftests/nolibc/nolibc-test-linkage.c index 5ff4c8a1db2a46cf3f8cb55bdabaa5e8819b344c..a7ca8325863face9cd4134a717fe4c7761bdeb7f 100644 --- a/tools/testing/selftests/nolibc/nolibc-test-linkage.c +++ b/tools/testing/selftests/nolibc/nolibc-test-linkage.c @@ -11,16 +11,16 @@ void *linkage_test_errno_addr(void) return &errno; }

-int linkage_test_constructor_test_value; +int linkage_test_constructor_test_value = 0;

__attribute__((constructor)) static void constructor1(void) { - linkage_test_constructor_test_value = 2; + linkage_test_constructor_test_value |= 1 << 0; }

__attribute__((constructor)) static void constructor2(void) { - linkage_test_constructor_test_value *= 3; + linkage_test_constructor_test_value |= 1 << 1; } diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index a5abf16dbfe0f2aed286964fdfc391bc6201ef3b..5884a891c491544050fc35b07322c73a1a9dbaf3 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -692,14 +692,14 @@ int expect_strtox(int llen, void *func, const char *input, int base, intmax_t ex __attribute__((constructor)) static void constructor1(void) { - constructor_test_value = 1; + constructor_test_value |= 1 << 0; }

__attribute__((constructor)) static void constructor2(int argc, char **argv, char **envp) { if (argc && argv && envp) - constructor_test_value *= 2; + constructor_test_value |= 1 << 1; }

int run_startup(int min, int max) @@ -738,9 +738,9 @@ int run_startup(int min, int max) CASE_TEST(environ_HOME); EXPECT_PTRNZ(1, getenv("HOME")); break; CASE_TEST(auxv_addr); EXPECT_PTRGT(test_auxv != (void *)-1, test_auxv, brk); break; CASE_TEST(auxv_AT_UID); EXPECT_EQ(1, getauxval(AT_UID), getuid()); break; - CASE_TEST(constructor); EXPECT_EQ(is_nolibc, constructor_test_value, 2); break; + CASE_TEST(constructor); EXPECT_EQ(is_nolibc, constructor_test_value, 0x3); break; CASE_TEST(linkage_errno); EXPECT_PTREQ(1, linkage_test_errno_addr(), &errno); break; - CASE_TEST(linkage_constr); EXPECT_EQ(is_nolibc, linkage_test_constructor_test_value, 6); break; + CASE_TEST(linkage_constr); EXPECT_EQ(1, linkage_test_constructor_test_value, 0x3); break; case __LINE__: return ret; /* must be last */ /* note: do not set any defaults so as to permit holes above */

--- base-commit: 6e406202a44a1a37176da0333cec10d5320c4b33 change-id: 20250306-nolibc-constructor-order-6921e8c93591

Best regards,