From 51e430392d125ad7b36ec43e1448f3235d221b39 Mon Sep 17 00:00:00 2001 From: Stefan Tauner Date: Fri, 2 Dec 2016 02:09:23 +0100 Subject: Fix undefined behavior in some preprocessor define checks Macros like the one below would produce undefined behavior when used as expression/condition in #if preprocessor directives: This patch replaces all such statements with a more verbose but well-defined #if/#define x 1/#else/#define x 0/#endif Found by clang (warning introduced in r258128), reported by Idwer. Signed-off-by: Stefan Tauner Acked-by: Carl-Daniel Hailfinger --- hwaccess.c | 18 +++++++++++++++--- platform.h | 18 +++++++++++++++--- 2 files changed, 30 insertions(+), 6 deletions(-) diff --git a/hwaccess.c b/hwaccess.c index 1901ee6a7..80852e71f 100644 --- a/hwaccess.c +++ b/hwaccess.c @@ -37,9 +37,21 @@ #error "Unknown operating system" #endif -#define USE_IOPL (IS_LINUX || IS_MACOSX || defined(__NetBSD__) || defined(__OpenBSD__)) -#define USE_DEV_IO (defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)) -#define USE_IOPERM (defined(__gnu_hurd__)) +#if (IS_LINUX || IS_MACOSX || defined(__NetBSD__) || defined(__OpenBSD__)) + #define USE_IOPL (1) +#else + #define USE_IOPL (0) +#endif +#if (defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)) + #define USE_DEV_IO (1) +#else + #define USE_DEV_IO (0) +#endif +#if (defined(__gnu_hurd__)) + #define USE_IOPERM (1) +#else + #define USE_IOPERM (0) +#endif #if USE_IOPERM #include diff --git a/platform.h b/platform.h index c5a52ef89..d70a6e0dd 100644 --- a/platform.h +++ b/platform.h @@ -25,9 +25,21 @@ #define __PLATFORM_H__ 1 // Helper defines for operating systems -#define IS_LINUX (defined(__gnu_linux__) || defined(__linux__)) -#define IS_MACOSX (defined(__APPLE__) && defined(__MACH__)) /* yes, both. */ -#define IS_WINDOWS (defined(_WIN32) || defined(_WIN64) || defined(__WIN32__) || defined(__WINDOWS__)) +#if (defined(__gnu_linux__) || defined(__linux__)) + #define IS_LINUX (1) +#else + #define IS_LINUX (0) +#endif +#if (defined(__APPLE__) && defined(__MACH__)) /* yes, both. */ + #define IS_MACOSX (1) +#else + #define IS_MACOSX (0) +#endif +#if (defined(_WIN32) || defined(_WIN64) || defined(__WIN32__) || defined(__WINDOWS__)) + #define IS_WINDOWS (1) +#else + #define IS_WINDOWS (0) +#endif // Likewise for target architectures #if defined (__i386__) || defined (__x86_64__) || defined(__amd64__) -- cgit v1.2.3