Remove various things which were checking for gcc-1.x and gcc-2.x compilers.
From: Adrian Bunk <bunk@stusta.de>
Some documentation updates and removes some code paths for gcc < 3.2.
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Eine deutsche Version dieser Datei finden Sie unter
<http://www.stefan-winter.de/Changes-2.4.0.txt>.
-Last updated: October 29th, 2002
-
Chris Ricker (kaboom@gatech.edu or chris.ricker@genetics.utah.edu).
Current Minimal Requirements
hardware, for example, you probably needn't concern yourself with
isdn4k-utils.
-o Gnu C 2.95.3 # gcc --version
+o Gnu C 3.2 # gcc --version
o Gnu make 3.79.1 # make --version
o binutils 2.12 # ld -v
o util-linux 2.10o # fdformat --version
---
The gcc version requirements may vary depending on the type of CPU in your
-computer. The next paragraph applies to users of x86 CPUs, but not
-necessarily to users of other CPUs. Users of other CPUs should obtain
-information about their gcc version requirements from another source.
-
-The recommended compiler for the kernel is gcc 2.95.x (x >= 3), and it
-should be used when you need absolute stability. You may use gcc 3.0.x
-instead if you wish, although it may cause problems. Later versions of gcc
-have not received much testing for Linux kernel compilation, and there are
-almost certainly bugs (mainly, but not exclusively, in the kernel) that
-will need to be fixed in order to use these compilers. In any case, using
-pgcc instead of plain gcc is just asking for trouble.
-
-The Red Hat gcc 2.96 compiler subtree can also be used to build this tree.
-You should ensure you use gcc-2.96-74 or later. gcc-2.96-54 will not build
-the kernel correctly.
-
-In addition, please pay attention to compiler optimization. Anything
-greater than -O2 may not be wise. Similarly, if you choose to use gcc-2.95.x
-or derivatives, be sure not to use -fstrict-aliasing (which, depending on
-your version of gcc 2.95.x, may necessitate using -fno-strict-aliasing).
+computer.
Make
----
Kernel compilation
******************
-gcc 2.95.3
-----------
-o <ftp://ftp.gnu.org/gnu/gcc/gcc-2.95.3.tar.gz>
+gcc
+---
+o <ftp://ftp.gnu.org/gnu/gcc/>
Make
----
COMPILING the kernel:
- - Make sure you have gcc 2.95.3 available.
- gcc 2.91.66 (egcs-1.1.2), and gcc 2.7.2.3 are known to miscompile
- some parts of the kernel, and are *no longer supported*.
- Also remember to upgrade your binutils package (for as/ld/nm and company)
- if necessary. For more information, refer to Documentation/Changes.
+ - Make sure you have at least gcc 3.2 available.
+ For more information, refer to Documentation/Changes.
Please note that you can still run a.out user programs with this kernel.
#error Sorry, your compiler targets APCS-26 but this kernel requires APCS-32
#endif
/*
- * GCC 2.95.1, 2.95.2: ignores register clobber list in asm().
* GCC 3.0, 3.1: general bad code generation.
* GCC 3.2.0: incorrect function argument offset calculation.
* GCC 3.2.x: miscompiles NEW_AUX_ENT in fs/binfmt_elf.c
* (http://gcc.gnu.org/PR8896) and incorrect structure
* initialisation in fs/jffs2/erase.c
*/
-#if __GNUC__ < 2 || \
- (__GNUC__ == 2 && __GNUC_MINOR__ < 95) || \
- (__GNUC__ == 2 && __GNUC_MINOR__ == 95 && __GNUC_PATCHLEVEL__ != 0 && \
- __GNUC_PATCHLEVEL__ < 3) || \
- (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
#error Your compiler is too buggy; it is known to miscompile kernels.
-#error Known good compilers: 2.95.3, 2.95.4, 2.96, 3.3
+#error Known good compilers: 3.3
#endif
/* Use marker if you need to separate the values later */
#if defined(__APCS_32__) && defined(CONFIG_CPU_26)
#error Sorry, your compiler targets APCS-32 but this kernel requires APCS-26
#endif
-#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 95)
-#error Sorry, your compiler is known to miscompile kernels. Only use gcc 2.95.3 and later.
-#endif
-#if __GNUC__ == 2 && __GNUC_MINOR__ == 95
-/* shame we can't detect the .1 or .2 releases */
-#warning GCC 2.95.2 and earlier miscompiles kernels.
-#endif
/* Use marker if you need to separate the values later */
and passes the first three arguments of a function call in registers.
This will probably break binary only modules.
- This feature is only enabled for gcc-3.0 and later - earlier compilers
- generate incorrect output with certain kernel constructs when
- -mregparm=3 is used.
-
config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS
# CPU-specific tuning. Anything which can be shared with UML should go here.
include $(srctree)/arch/i386/Makefile.cpu
-# -mregparm=3 works ok on gcc-3.0 and later
-#
-GCC_VERSION := $(call cc-version)
-cflags-$(CONFIG_REGPARM) += $(shell if [ $(GCC_VERSION) -ge 0300 ] ; then echo "-mregparm=3"; fi ;)
+cflags-$(CONFIG_REGPARM) += -mregparm=3
# Disable unit-at-a-time mode, it makes gcc use a lot more stack
# due to the lack of sharing of stacklots.
# CPU tuning section - shared with UML.
# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.
-#-mtune exists since gcc 3.4, and some -mcpu flavors didn't exist in gcc 2.95.
+#-mtune exists since gcc 3.4
HAS_MTUNE := $(call cc-option-yn, -mtune=i386)
ifeq ($(HAS_MTUNE),y)
tune = $(call cc-option,-mtune=$(1),)
cflags-$(CONFIG_M486) += -march=i486
cflags-$(CONFIG_M586) += -march=i586
cflags-$(CONFIG_M586TSC) += -march=i586
-cflags-$(CONFIG_M586MMX) += $(call cc-option,-march=pentium-mmx,-march=i586)
+cflags-$(CONFIG_M586MMX) += -march=pentium-mmx
cflags-$(CONFIG_M686) += -march=i686
cflags-$(CONFIG_MPENTIUMII) += -march=i686 $(call tune,pentium2)
cflags-$(CONFIG_MPENTIUMIII) += -march=i686 $(call tune,pentium3)
cflags-$(CONFIG_MK6) += -march=k6
# Please note, that patches that add -march=athlon-xp and friends are pointless.
# They make zero difference whatsosever to performance at this time.
-cflags-$(CONFIG_MK7) += $(call cc-option,-march=athlon,-march=i686 $(align)-functions=4)
-cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,$(call cc-option,-march=athlon,-march=i686 $(align)-functions=4))
+cflags-$(CONFIG_MK7) += -march=athlon
+cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon)
cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586)
cflags-$(CONFIG_X86_ELAN) += -march=i486
# Geode GX1 support
-cflags-$(CONFIG_MGEODEGX1) += $(call cc-option,-march=pentium-mmx,-march=i486)
+cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx
ftp://ftp.hpl.hp.com/pub/linux-ia64/gas-030124.tar.gz)
endif
-ifneq ($(shell if [ $(GCC_VERSION) -lt 0300 ] ; then echo "bad"; fi ;),)
-$(error Sorry, your compiler is too old. GCC v2.96 is known to generate bad code.)
-endif
-
ifeq ($(GCC_VERSION),0304)
cflags-$(CONFIG_ITANIUM) += -mtune=merced
cflags-$(CONFIG_MCKINLEY) += -mtune=mckinley
* the clobber lists for spin_lock() in include/asm-ia64/spinlock.h.
*/
-#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
GLOBAL_ENTRY(ia64_spinlock_contention_pre3_4)
.prologue
#ifdef ASM_SUPPORTED
# ifdef CONFIG_SMP
-# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+# if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
/*
* This is not a normal routine and we don't want a function descriptor for it, so we use
* a fake declaration here.
u64 *prev_pfs_loc; /* state for WAR for old spinlock ool code */
} ia64_backtrace_t;
-#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
/*
* Returns non-zero if the PC is in the spinlock contention out-of-line code
* with non-standard calling sequence (on older compilers).
printk("raid0 : conf->hash_spacing is %llu blocks.\n",
(unsigned long long)conf->hash_spacing);
{
-#if __GNUC__ < 3
- volatile
-#endif
sector_t s = mddev->array_size;
sector_t space = conf->hash_spacing;
int round;
{
-#if __GNUC__ < 3
- volatile
-#endif
sector_t x = block >> conf->preshift;
sector_div(x, (u32)conf->hash_spacing);
zone = conf->hash_table[x];
};
char *v4l2_ioctl_names[256] = {
-#if __GNUC__ >= 3
[0 ... 255] = "UNKNOWN",
-#endif
[_IOC_NR(VIDIOC_QUERYCAP)] = "VIDIOC_QUERYCAP",
[_IOC_NR(VIDIOC_RESERVED)] = "VIDIOC_RESERVED",
[_IOC_NR(VIDIOC_ENUM_FMT)] = "VIDIOC_ENUM_FMT",
mlog(ML_ENTRY, "ENTRY:\n"); \
} while (0)
-/* We disable this for old compilers since they don't have support for
- * __builtin_types_compatible_p.
+/*
+ * We disable this for sparse.
*/
-#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) && \
- !defined(__CHECKER__)
+#if !defined(__CHECKER__)
#define mlog_exit(st) do { \
if (__builtin_types_compatible_p(typeof(st), unsigned long)) \
mlog(ML_EXIT, "EXIT: %lu\n", (unsigned long) (st)); \
* By comparing each compnent, we don't have to worry about extra
* endian issues in treating two 32 bit numbers as one 64 bit number
*/
-static
-#if defined(__GNUC__) && (__GNUC__ == 2) && ( (__GNUC_MINOR__ == 95) || (__GNUC_MINOR__ == 96))
-__attribute__((unused)) /* gcc 2.95, 2.96 miscompile this when inlined */
-#else
-__inline__
-#endif
-xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
+static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
{
if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
#undef inline
#undef __inline__
#undef __inline
-#if __GNUC__ == 3 && __GNUC_MINOR__ >= 1 || __GNUC__ > 3
#undef __always_inline
#define __always_inline inline __attribute__((always_inline))
-#endif
#endif /* __ALPHA_COMPILER_H */
#define spin_lock_prefetch(lock) do { } while (0)
#endif
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
extern inline void prefetch(const void *ptr)
{
__builtin_prefetch(ptr, 0, 3);
}
#endif
-#else
-extern inline void prefetch(const void *ptr)
-{
- __asm__ ("ldl $31,%0" : : "m"(*(char *)ptr));
-}
-
-extern inline void prefetchw(const void *ptr)
-{
- __asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
-}
-
-#ifdef CONFIG_SMP
-extern inline void spin_lock_prefetch(const void *ptr)
-{
- __asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
-}
-#endif
-
-#endif /* GCC 3.1 */
-
#endif /* __ASM_ALPHA_PROCESSOR_H */
#define _ASM_IA64_BUG_H
#ifdef CONFIG_BUG
-#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
-# define ia64_abort() __builtin_trap()
-#else
-# define ia64_abort() (*(volatile int *) 0 = 0)
-#endif
+#define ia64_abort() __builtin_trap()
#define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); ia64_abort(); } while (0)
/* should this BUG be made generic? */
{
register volatile unsigned int *ptr asm ("r31") = &lock->lock;
-#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
# ifdef CONFIG_ITANIUM
/* don't use brl on Itanium... */
asm volatile ("{\n\t"
* not preserve it's value. Hairy, but it lets us remove 2 loads
* and 2 stores in this critical code path. -DaveM
*/
-#if __GNUC__ >= 3
#define EXTRA_CLOBBER ,"%l1"
-#else
-#define EXTRA_CLOBBER
-#endif
#define switch_to(prev, next, last) \
do { if (test_thread_flag(TIF_PERFCTR)) { \
unsigned long __tmp; \
#ifndef __UM_RWSEM_H__
#define __UM_RWSEM_H__
-#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
-#define __builtin_expect(exp,c) (exp)
-#endif
-
#include "asm/arch/rwsem.h"
#endif
/* User programs sometimes end up including this header file
(indirectly, via uClibc header files), so I'm a bit nervous just
including <linux/compiler.h>. */
-#if !defined(__builtin_expect) && __GNUC__ == 2 && __GNUC_MINOR__ < 96
-#define __builtin_expect(x, expected_value) (x)
-#endif
#define __syscall_return(type, res) \
do { \
__syscall_return (type, __ret); \
}
-#if __GNUC__ < 3
-/* In older versions of gcc, `asm' statements with more than 10
- input/output arguments produce a fatal error. To work around this
- problem, we use two versions, one for gcc-3.x and one for earlier
- versions of gcc (the `earlier gcc' version doesn't work with gcc-3.x
- because gcc-3.x doesn't allow clobbers to also be input arguments). */
-#define __SYSCALL6_TRAP(syscall, ret, a, b, c, d, e, f) \
- __asm__ __volatile__ ("trap " SYSCALL_LONG_TRAP \
- : "=r" (ret), "=r" (syscall) \
- : "1" (syscall), \
- "r" (a), "r" (b), "r" (c), "r" (d), \
- "r" (e), "r" (f) \
- : SYSCALL_CLOBBERS, SYSCALL_ARG4, SYSCALL_ARG5);
-#else /* __GNUC__ >= 3 */
#define __SYSCALL6_TRAP(syscall, ret, a, b, c, d, e, f) \
__asm__ __volatile__ ("trap " SYSCALL_LONG_TRAP \
: "=r" (ret), "=r" (syscall), \
"r" (a), "r" (b), "r" (c), "r" (d), \
"2" (e), "3" (f) \
: SYSCALL_CLOBBERS);
-#endif
#define _syscall6(type, name, atype, a, btype, b, ctype, c, dtype, d, etype, e, ftype, f) \
type name (atype a, btype b, ctype c, dtype d, etype e, ftype f) \
extern __u16 ntohs(__be16);
extern __be16 htons(__u16);
-#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
+#if defined(__GNUC__) && defined(__OPTIMIZE__)
#define ___htonl(x) __cpu_to_be32(x)
#define ___htons(x) __cpu_to_be16(x)
/*
* Allow constant folding
*/
-#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
+#if defined(__GNUC__) && defined(__OPTIMIZE__)
# define __swab16(x) \
(__builtin_constant_p((__u16)(x)) ? \
___swab16((x)) : \
/*
* Allow constant folding
*/
-#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)
+#if defined(__GNUC__) && defined(__OPTIMIZE__)
# define __swahw32(x) \
(__builtin_constant_p((__u32)(x)) ? \
___swahw32((x)) : \
({ unsigned long __ptr; \
__asm__ ("" : "=g"(__ptr) : "0"(ptr)); \
(typeof(ptr)) (__ptr + (off)); })
+
+
+#define inline inline __attribute__((always_inline))
+#define __inline__ __inline__ __attribute__((always_inline))
+#define __inline __inline __attribute__((always_inline))
+#define __deprecated __attribute__((deprecated))
+#define noinline __attribute__((noinline))
+#define __attribute_pure__ __attribute__((pure))
+#define __attribute_const__ __attribute__((__const__))
/* These definitions are for GCC v3.x. */
#include <linux/compiler-gcc.h>
-#if __GNUC_MINOR__ >= 1
-# define inline inline __attribute__((always_inline))
-# define __inline__ __inline__ __attribute__((always_inline))
-# define __inline __inline __attribute__((always_inline))
-#endif
-
-#if __GNUC_MINOR__ > 0
-# define __deprecated __attribute__((deprecated))
-#endif
-
#if __GNUC_MINOR__ >= 3
# define __attribute_used__ __attribute__((__used__))
#else
# define __attribute_used__ __attribute__((__unused__))
#endif
-#define __attribute_pure__ __attribute__((pure))
-#define __attribute_const__ __attribute__((__const__))
-
-#if __GNUC_MINOR__ >= 1
-#define noinline __attribute__((noinline))
-#endif
-
#if __GNUC_MINOR__ >= 4
#define __must_check __attribute__((warn_unused_result))
#endif
/* These definitions are for GCC v4.x. */
#include <linux/compiler-gcc.h>
-#define inline inline __attribute__((always_inline))
-#define __inline__ __inline__ __attribute__((always_inline))
-#define __inline __inline __attribute__((always_inline))
-#define __deprecated __attribute__((deprecated))
#define __attribute_used__ __attribute__((__used__))
-#define __attribute_pure__ __attribute__((pure))
-#define __attribute_const__ __attribute__((__const__))
-#define noinline __attribute__((noinline))
#define __must_check __attribute__((warn_unused_result))
#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
#endif
/* Trap pasters of __FUNCTION__ at compile-time */
-#if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
#define __FUNCTION__ (__func__)
-#endif
#endif
#else /* CONFIG_SECCOMP */
-#if (__GNUC__ > 2)
- typedef struct { } seccomp_t;
-#else
- typedef struct { int gcc_is_buggy; } seccomp_t;
-#endif
+typedef struct { } seccomp_t;
#define secure_computing(x) do { } while (0)
/* static inline to preserve typechecking */
#else
-/*
- * All gcc 2.95 versions and early versions of 2.96 have a nasty bug
- * with empty initializers.
- */
-#if (__GNUC__ > 2)
typedef struct { } raw_spinlock_t;
#define __RAW_SPIN_LOCK_UNLOCKED { }
-#else
-typedef struct { int gcc_is_buggy; } raw_spinlock_t;
-#define __RAW_SPIN_LOCK_UNLOCKED (raw_spinlock_t) { 0 }
-#endif
#endif
-#if (__GNUC__ > 2)
typedef struct {
/* no debug version on UP */
} raw_rwlock_t;
#define __RAW_RW_LOCK_UNLOCKED { }
-#else
-typedef struct { int gcc_is_buggy; } raw_rwlock_t;
-#define __RAW_RW_LOCK_UNLOCKED (raw_rwlock_t) { 0 }
-#endif
#endif /* __LINUX_SPINLOCK_TYPES_UP_H */
#ifdef WF_DEBUG
-#if defined(NEW_MACRO_VARARGS) || __GNUC__ >= 3
#define DPRINT(cond, ...) \
if ((dev->debug & (cond)) == (cond)) { \
snd_printk (__VA_ARGS__); \
}
#else
-#define DPRINT(cond, args...) \
- if ((dev->debug & (cond)) == (cond)) { \
- snd_printk (args); \
- }
-#endif
-#else
#define DPRINT(cond, args...)
#endif /* WF_DEBUG */
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