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[12/16] selftests: vDSO: parse_vdso: Test __SIZEOF_LONG__ instead of ULONG_MAX

Message ID 20250203-parse_vdso-nolibc-v1-12-9cb6268d77be@linutronix.de (mailing list archive)
State New
Headers show
Series selftests: vDSO: parse_vdso: Make compatible with nolibc | expand

Commit Message

Thomas Weißschuh Feb. 3, 2025, 9:05 a.m. UTC 
According to limits.h(2) ULONG_MAX is only guaranteed to expand to an
expression, not a symbolic constant which can be evaluated by the
preprocessor.
Specifically the definition of ULONG_MAX from nolibc can no be evaluated
by the preprocessor. To provide compatibility with nolibc, check with
__SIZEOF_LONG__ instead, with is provided directly by the preprocessor
and therefore always a symbolic constant.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 tools/testing/selftests/vDSO/parse_vdso.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c
index 200c534cc70e2c2381fce3be5c0ebe4cb5675e84..902b8f9984a1f70049d46bcd4f199df24f507dcb 100644
--- a/tools/testing/selftests/vDSO/parse_vdso.c
+++ b/tools/testing/selftests/vDSO/parse_vdso.c
@@ -26,7 +26,7 @@ 
 
 /* And here's the code. */
 #ifndef ELF_BITS
-# if ULONG_MAX > 0xffffffffUL
+# if __SIZEOF_LONG__ >= 8
 #  define ELF_BITS 64
 # else
 #  define ELF_BITS 32