[parisc-linux] glibc-2.3.3 & gcc-snapshot (3.5.0) pb

[Joel Soete]

Hi Carlos,

I find a better reason why the build of glibc failed with gcc-3.5: here is
the dump of rtld.os (which would contains ref to set_dp):
with gcc-3.3
------------
palx2000:/Develop/parisc-linux/build/glibc# objdump -d ./elf/rtld.os | more

./elf/rtld.os:     file format elf32-hppa-linux

Disassembly of section .text:

00000000 <set_dp>:
       0:	4b 54 00 48 	ldw 24(,r26),r20
       4:	0e 88 10 9b 	ldw 4(,r20),dp
       8:	e8 40 c0 00 	bv r0(rp)
       c:	08 1a 02 5c 	copy r26,ret0

00000010 <_start>:
      10:	37 de 00 80 	ldo 40(sp),sp
      14:	6b d9 3f b1 	stw r25,-28(,sp)
      18:	6b d8 3f a9 	stw r24,-2c(,sp)
      1c:	ea 60 00 00 	b,l 24 <_start+0x14>,r19
      20:	d6 60 1c 1e 	depwi 0,31,2,r19
      24:	2a 60 00 00 	addil 0,r19,%r1
      28:	34 3a 00 00 	ldo 0(r1),r26
      2c:	2a 60 00 00 	addil 0,r19,%r1
      30:	48 34 00 00 	ldw 0(,r1),r20
      34:	0a 9a 04 14 	sub r26,r20,r20
      38:	0f 50 10 b3 	ldw,ma 8(,r26),r19
      3c:	86 66 20 12 	cmpib,=,n 3,r19,4c <_start+0x3c>
      40:	8e 60 3f ef 	cmpib,<>,n 0,r19,3c <_start+0x2c>
      44:	0f 50 10 b3 	ldw,ma 8(,r26),r19
      48:	04 00 00 00 	iitlbp r0,(sr0,r0)
      4c:	0f 59 10 93 	ldw -4(,r26),r19
      50:	0a 93 06 13 	add r19,r20,r19
      54:	e8 40 07 f0 	b,l 454 <_dl_start>,rp
      58:	37 1a 3f f9 	ldo -4(r24),r26

========><========

with gcc-3.5
------------
palx4000:/Develop/parisc-linux/build/glibc# objdump -d ./elf/rtld.os | more

./elf/rtld.os:     file format elf32-hppa-linux

Disassembly of section .text:

00000000 <_start>:
       0:	37 de 00 80 	ldo 40(sp),sp
       4:	6b d9 3f b1 	stw r25,-28(sp)
       8:	6b d8 3f a9 	stw r24,-2c(sp)
       c:	ea 60 00 00 	b,l 14 <_start+0x14>,r19
      10:	d6 60 1c 1e 	depwi 0,31,2,r19
      14:	2a 60 00 00 	addil 0,r19,%r1
      18:	34 3a 00 00 	ldo 0(r1),r26
      1c:	2a 60 00 00 	addil 0,r19,%r1
      20:	48 34 00 00 	ldw 0(r1),r20
      24:	0a 9a 04 14 	sub r26,r20,r20
      28:	0f 50 10 b3 	ldw,ma 8(,r26),r19
      2c:	86 66 20 12 	cmpib,=,n 3,r19,3c <_start+0x3c>
      30:	8e 60 3f ef 	cmpib,<>,n 0,r19,2c <_start+0x2c>
      34:	0f 50 10 b3 	ldw,ma 8(,r26),r19
      38:	04 00 00 00 	iitlbp r0,(sr0,r0)
      3c:	0f 59 10 93 	ldw -4(,r26),r19
      40:	0a 93 06 13 	add r19,r20,r19
      44:	e8 41 02 84 	b,l 318c <_dl_start>,rp
      48:	37 1a 3f f9 	ldo -4(r24),r26

Why ref to <set_dp> is removed by gcc-3.5?
Is there a new optimization in gcc which remove "defined but not used" in
resulting obj?

Should I log a pb near gcc team?

Thanks again,
    Joel


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