From f2615ab5380d449ed5c4fa677a4929043d41b97b Mon Sep 17 00:00:00 2001 From: Denis 'GNUtoo' Carikli Date: Mon, 23 Aug 2021 19:19:53 +0200 Subject: Add support for gcc6 Without that fix, when building Replicant 6.0 on Trisquel 9 (etiona) we have the following build error: Using [...]/kernel/samsung/smdk4412 as source for kernel CHK include/generated/utsrelease.h make[3]: 'include/generated/mach-types.h' is up to date. CC kernel/bounds.s In file included from [...]/kernel/samsung/smdk4412/include/linux/compiler.h:48:0, from [...]/kernel/samsung/smdk4412/include/linux/stddef.h:4, from [...]/kernel/samsung/smdk4412/include/linux/posix_types.h:4, from [...]/kernel/samsung/smdk4412/include/linux/types.h:17, from [...]/kernel/samsung/smdk4412/include/linux/page-flags.h:8, from [...]/kernel/samsung/smdk4412/kernel/bounds.c:9: [...]/kernel/samsung/smdk4412/include/linux/compiler-gcc.h:99:30: fatal error: linux/compiler-gcc6.h: No such file or directory #include gcc_header(__GNUC__) ^ Signed-off-by: Denis 'GNUtoo' Carikli --- include/linux/compiler-gcc6.h | 66 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 include/linux/compiler-gcc6.h diff --git a/include/linux/compiler-gcc6.h b/include/linux/compiler-gcc6.h new file mode 100644 index 00000000000..a3d00d8d316 --- /dev/null +++ b/include/linux/compiler-gcc6.h @@ -0,0 +1,66 @@ +#ifndef __LINUX_COMPILER_H +#error "Please don't include directly, include instead." +#endif + +#define __used __attribute__((__used__)) +#define __must_check __attribute__((warn_unused_result)) +#define __compiler_offsetof(a, b) __builtin_offsetof(a, b) + +/* Mark functions as cold. gcc will assume any path leading to a call + to them will be unlikely. This means a lot of manual unlikely()s + are unnecessary now for any paths leading to the usual suspects + like BUG(), printk(), panic() etc. [but let's keep them for now for + older compilers] + + Early snapshots of gcc 4.3 don't support this and we can't detect this + in the preprocessor, but we can live with this because they're unreleased. + Maketime probing would be overkill here. + + gcc also has a __attribute__((__hot__)) to move hot functions into + a special section, but I don't see any sense in this right now in + the kernel context */ +#define __cold __attribute__((__cold__)) + +#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) + +#ifndef __CHECKER__ +# define __compiletime_warning(message) __attribute__((warning(message))) +# define __compiletime_error(message) __attribute__((error(message))) +#endif /* __CHECKER__ */ + +/* + * Mark a position in code as unreachable. This can be used to + * suppress control flow warnings after asm blocks that transfer + * control elsewhere. + * + * Early snapshots of gcc 4.5 don't support this and we can't detect + * this in the preprocessor, but we can live with this because they're + * unreleased. Really, we need to have autoconf for the kernel. + */ +#define unreachable() __builtin_unreachable() + +/* Mark a function definition as prohibited from being cloned. */ +#define __noclone __attribute__((__noclone__)) + +/* + * Tell the optimizer that something else uses this function or variable. + */ +#define __visible __attribute__((externally_visible)) + +/* + * GCC 'asm goto' miscompiles certain code sequences: + * + * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 + * + * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. + * Fixed in GCC 4.8.2 and later versions. + * + * (asm goto is automatically volatile - the naming reflects this.) + */ +#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) + +#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP +#define __HAVE_BUILTIN_BSWAP32__ +#define __HAVE_BUILTIN_BSWAP64__ +#define __HAVE_BUILTIN_BSWAP16__ +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ -- cgit v1.2.3