On 24/11/2018 22:21, Florian Klämpfl wrote:
Am 24.11.2018 um 10:08 schrieb C Western:
On 23/11/2018 09:50, Sven Barth via fpc-pascal wrote:
Am Fr., 23. Nov. 2018, 10:26 hat C Western <l...@c-m-w.me.uk
<mailto:l...@c-m-w.me.uk>> geschrieben:
I haven't been able to build trunk i386 fpc for a couple of weeks. Is
this supposed to be working, or have I misconfigured something? (I
don't
think I have changed anything.) The output is below. I don't think
it is
significant, but I am building on a 64 bit system, but with a 32 bit
starting compiler. (The 64 bit build with the 64 bit starting
compiler
works fine.)
We have i386 trunk building on at least one x86_64-linux machine, so it can't
be a principal problem. :/
Could you check whether it's FPC itself that segfaults or something else and if
the former try to retrieve a
stacktrace, please?
Regards,
Sven
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Looks like the ppc1 compiler crashes during setup:
gdb) run
Starting program: /home/me/fpc/trunk/fpcsrc/compiler/ppc1
Program received signal SIGSEGV, Segmentation fault.
0x08068760 in INITTLS () at system.pp:543
543 case phdr^.p_type of
(gdb) bt
#0 0x08068760 in INITTLS () at system.pp:543
#1 0x082a63fb in _FPC_PROC_START () at ./i386/si_prc.inc:105
(gdb) p phdr
$1 = (PPHDR) 0x8048034
(gdb) p phdr^
Cannot access memory at address 0x8048034
Can you please check what value phdr has at the crash location after applying
the following patch?
diff --git a/rtl/linux/system.pp b/rtl/linux/system.pp
index 0d7ed2b152..74b4592ace 100644
--- a/rtl/linux/system.pp
+++ b/rtl/linux/system.pp
@@ -525,6 +525,8 @@ procedure InitTLS; [public,alias:'FPC_INITTLS'];
while assigned(auxp^) do
inc(auxp);
inc(auxp);
+ phdr:=nil;
+ phnum:=0;
{ now we are at the auxillary vector }
while assigned(auxp^) do
begin
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That gives the same value as shown above, even after applying the patch.
Single stepping the code indicates that both variables are assigned:
(Some lines deleted).
Breakpoint 1, INITTLS () at system.pp:523
523 auxp:=ppointer(envp);
(gdb) n
525 while assigned(auxp^) do
(gdb) n
533 case plongint(auxp)^ of
(gdb) n
535 phdr:=pphdr(ppointer(auxp+1)^);
(gdb) n
539 inc(auxp,2);
(gdb) p phdr
$3 = (PPHDR) 0x8048034
(gdb) p phdr^
Cannot access memory at address 0x8048034
(gdb) n
533 case plongint(auxp)^ of
(gdb) n
539 inc(auxp,2);
(gdb) n
533 case plongint(auxp)^ of
(gdb) n
537 phnum:=pdword(auxp+1)^;
(gdb) n
539 inc(auxp,2);
(gdb) p phnum
$4 = 4
(gdb)
543 for i:=1 to phnum do
(gdb) n
545 case phdr^.p_type of
(gdb) n
Program received signal SIGSEGV, Segmentation fault.
0x0806ef01 in INITTLS () at system.pp:545
545 case phdr^.p_type of
(gdb) p phdr
$5 = (PPHDR) 0x8048034
(gdb)
Colin
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