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i386: Remove build support for GCC older than GCC 6

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Since GCC 6.2 or later is required to build glibc, remove build support
for GCC older than GCC 6.

Testd with GCC 6.4 and GCC 9.3.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
H.J. Lu 2020-04-07 06:44:37 -07:00
parent 10b2cdc3b3
commit 93a0959ef2
3 changed files with 4 additions and 52 deletions
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2
sysdeps/i386/sysdep.h
View File

@ -18,8 +18,6 @@
#include <sysdeps/x86/sysdep.h>
#include <features.h> /* For __GNUC_PREREQ. */
/* It is desirable that the names of PIC thunks match those used by
GCC so that multiple copies are eliminated by the linker. Because
GCC 4.6 and earlier use __i686 in the names, it is necessary to

31
sysdeps/i386/tls-macros.h
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@ -1,5 +1,3 @@
#include <features.h> /* For __GNUC_PREREQ. */
#define TLS_LE(x) \
({ int *__l; \
asm ("movl %%gs:0,%0\n\t" \
@ -7,14 +5,6 @@
: "=r" (__l)); \
__l; })
#if defined PIC && !__GNUC_PREREQ (5,0)
# define TLS_IE(x) \
({ int *__l; \
asm ("movl %%gs:0,%0\n\t" \
"subl " #x "@gottpoff(%%ebx),%0" \
: "=r" (__l)); \
__l; })
#else
#define TLS_IE(x) \
({ int *__l, __b; \
asm ("call 1f\n\t" \
@ -27,17 +17,7 @@
"subl " #x "@gottpoff(%%ebx),%0" \
: "=r" (__l), "=&b" (__b)); \
__l; })
#endif
#if defined PIC && !__GNUC_PREREQ (5,0)
# define TLS_LD(x) \
({ int *__l, __c, __d; \
asm ("leal " #x "@tlsldm(%%ebx),%%eax\n\t" \
"call ___tls_get_addr@plt\n\t" \
"leal " #x "@dtpoff(%%eax), %%eax" \
: "=a" (__l), "=&c" (__c), "=&d" (__d)); \
__l; })
#else
#define TLS_LD(x) \
({ int *__l, __b, __c, __d; \
asm ("call 1f\n\t" \
@ -51,17 +31,7 @@
"leal " #x "@dtpoff(%%eax), %%eax" \
: "=a" (__l), "=&b" (__b), "=&c" (__c), "=&d" (__d)); \
__l; })
#endif
#if defined PIC && !__GNUC_PREREQ (5,0)
# define TLS_GD(x) \
({ int *__l, __c, __d; \
asm ("leal " #x "@tlsgd(%%ebx),%%eax\n\t" \
"call ___tls_get_addr@plt\n\t" \
"nop" \
: "=a" (__l), "=&c" (__c), "=&d" (__d)); \
__l; })
#else
#define TLS_GD(x) \
({ int *__l, __b, __c, __d; \
asm ("call 1f\n\t" \
@ -75,4 +45,3 @@
"nop" \
: "=a" (__l), "=&b" (__b), "=&c" (__c), "=&d" (__d)); \
__l; })
#endif

17
sysdeps/unix/sysv/linux/i386/sysdep.h
View File

@ -48,7 +48,7 @@
to compile glibc. Disable GCC 5 optimization when compiling for
profiling or when -fno-omit-frame-pointer is used since asm ("ebp")
can't be used to put the 6th argument in %ebp for syscall. */
#if __GNUC_PREREQ (5,0) && !defined PROF && CAN_USE_REGISTER_ASM_EBP
#if !defined PROF && CAN_USE_REGISTER_ASM_EBP
# define OPTIMIZE_FOR_GCC_5
#endif
@ -580,21 +580,6 @@ struct libc_do_syscall_args
# define EXTRAVAR_5
#endif
/* Consistency check for position-independent code. Disabled for GCC 5
and above since there is no fixed PIC register in GCC 5 and above. */
#if defined __PIC__ && !__GNUC_PREREQ (5,0)
# define check_consistency() \
({ int __res; \
__asm__ __volatile__ \
(LOAD_PIC_REG_STR (cx) ";" \
"subl %%ebx, %%ecx;" \
"je 1f;" \
"ud2;" \
"1:\n" \
: "=c" (__res)); \
__res; })
#endif
#endif /* __ASSEMBLER__ */