As a general part of testing for my platform (UnixWare),
I always run teh testsuites with -fPIC (I also multilib
for -fPIC). There is a general problem with PIC, and
its not unique to UnixWare, many of the same tests fail
on Linux when running the test suites with -fPIC. Many
of the errors are along the lines of:
cant find a register in class 'GENERAL_REGS' while
reloading 'asm'
For some of the test cases below, I believe its simply
becuase of the way the test case is written. However,
some I think are more problematic. They compile OK but
dont run when compiled -fPIC, but run fine when compiled
without it. In the list of test cases below, they are
marked with '*'. Those marked with '+' are the ones
that eject the GENERAL_REGS error above. The ones
marked with 'L' fail on Linux too.
+ L gcc.c-torture/compile/20000804-1.c -O0
+ L gcc.c-torture/compile/20000804-1.c -O1
* gcc.c-torture/execute/20050121-1.c -O0
* gcc.c-torture/execute/20050121-1.c -O1
* gcc.c-torture/execute/20050121-1.c -O2
* gcc.c-torture/execute/20050121-1.c -O3 -fomit-frame-pointer
* gcc.c-torture/execute/20050121-1.c -O3 -g
* gcc.c-torture/execute/20050121-1.c -Os
* gcc.c-torture/execute/960512-1.c -O0
* gcc.c-torture/execute/960512-1.c -O1
* gcc.c-torture/execute/960512-1.c -O2
* gcc.c-torture/execute/960512-1.c -O3 -fomit-frame-pointer
* gcc.c-torture/execute/960512-1.c -O3 -g
* gcc.c-torture/execute/960512-1.c -Os
* gcc.c-torture/execute/complex-1.c -O0
* gcc.c-torture/execute/complex-1.c -O1
* gcc.c-torture/execute/complex-1.c -O2
* gcc.c-torture/execute/complex-1.c -O3 -fomit-frame-pointer
* gcc.c-torture/execute/complex-1.c -O3 -g
* gcc.c-torture/execute/complex-1.c -Os
* gcc.c-torture/execute/complex-2.c -O0
* gcc.c-torture/execute/complex-2.c -O1
* gcc.c-torture/execute/complex-2.c -O2
* gcc.c-torture/execute/complex-2.c -O3 -fomit-frame-pointer
* gcc.c-torture/execute/complex-2.c -O3 -g
* gcc.c-torture/execute/complex-2.c -Os
* gcc.c-torture/execute/complex-6.c -O0
* gcc.c-torture/execute/complex-6.c -O1
* gcc.c-torture/execute/complex-6.c -O2
* gcc.c-torture/execute/complex-6.c -O3 -fomit-frame-pointer
* gcc.c-torture/execute/complex-6.c -O3 -g
* gcc.c-torture/execute/complex-6.c -Os
* gcc.dg/compat/scalar-return-3 c_compat_x_tst.o-c_compat_y_tst.o
gcc.dg/compat/vector-1_x.c
gcc.dg/compat/vector-2_x.c
(insn 48 47 34 (set (reg:SI 21 xmm0)
(mem:SI (plus:SI (reg/f:SI 6 bp)
(const_int -44 [0xffffffd4)) [0 S4 A8] 37 {*movsi_1_nointerunit} (nil)
(nil)))
ICE: in extract_constrain_insn_cached, at recog.c:2000
gcc.dg/compat/vector-1_y.c compile fails with:
In function test_v16qi:9 unable to find a register to spill in
class `GENERAL_REGS'. This is the insn:
(insn 45 49 46 0 (set (subreg:SI (reg:V16QI 73) 0)
(subreg:SI (reg:V16QI 21 xmm0) 0)) 37 {*movsi_1_nointerunit} (nil)
(nill))
gcc.dg/compat/vector-2_y.c compile fails with:
In function test_v4sf:9 unable to find a register to spill in
class `GENERAL_REGS'. This is the insn:
(insn 45 49 46 0 (set (subreg:SI (reg:V4SF 73) 0)
(subreg:SI (reg:V16QI 21 xmm0) 0)) 37 {*movsi_1_nointerunit} (nil)
(nill))
gcc.dg/20011119-1.c fails (also on Linux) with:
20011119-1.c:69: warning: asm operand 0 probably doesn't match constraints
20011119-1.c:69: error: impossible constraint in asm
gcc.dg/20020919-1.c fails (also on Linux) with:
error: PIC register '%ebx' clobbered by asm
gcc.dg/clobbers.c fails the same way
gcc.dg/i386-387-3.c
gcc.dg/i386-387-4.c
gcc.dg/i386-cmov1.c
gcc.dg/i386-mul.c
gcc.dg/i386-ssetype-1.c
gcc.dg/i386-ssetype-3.c
gcc.dg/i386-ssetype-5.c
All fail in assemble scans because the test cases dont take
PIC into account. This isnt a compiler error, but a test
case error. All fail on Linux too.
gcc.dg/sibcall-6.c execution test fails (on linux too)
I suspect that -fPIC doesn't get nearly as much testing as
it should, and I also bet that there is a solution to almost
all of these thats going to turn out to be pretty simple,
and will probably solve them all, as they mostly seem very
related.
--
Summary: Severe outages with -fPIC
Product: gcc
Version: 3.4.4
Status: UNCONFIRMED
Severity: critical
Priority: P1
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jkj at sco dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i586-pc-sysv5 i686-pc-linux-gnu
GCC host triplet: i586-pc-sysv5 i686-pc-linux-gnu
GCC target triplet: i586-pc-sysv5 i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23224
