Hi,
I tried to compile glibc 2.3.6 and 2.4 for an e500 target using
gcc-4.1.2-20070128.
I applied the proposed patch for PR30370 go get gcc compiled.
Unfortunately, glibc compilation fails. After some testing, I was able
to create a small test program - see below. It turns out that the
problem was introduced into the 4.1 branch between 11/17/06 and
11/24/06. gcc-4.2-20070131 also fails.
I tried both "--with-cpu=8540" and "--enable-e500-double --with-cpu=8548"
configuration options. gcc compiled for other powerpc/ppc targets
appears to be ok.
Has anyone besides me seen this problem ?
Thanks,
Guenter
Test code is as follows. Compile with any option for -me500 to see the
resulting error. Failing code in glibc is atomic_increment() in
elf/dl-profile.c,
line 550.
-----------------------------------------------
#define testmacro(mem) \
({ \
__typeof (*(mem)) __val; \
__asm __volatile (" addi %0,%2,1\n" \
: "=&b" (__val), "=m" (*mem) \
: "b" (mem), "m" (*mem) \
: "cr0", "memory"); \
__val; \
})
struct teststruct1
{
int count;
} __attribute__ ((packed));
struct teststruct2
{
int count;
};
void testfunc (struct teststruct1 *s1, struct teststruct2 *s2)
{
int v;
testmacro(&v); // ok
testmacro(&s1->count); // fails
testmacro(&s2->count); // ok
}
--------------------------------------------------
Compiler output:
$ ppc-teak-linuxspe1-gcc -c testcc.c
testcc.c: In function 'testfunc':
testcc.c:26: error: output number 1 not directly addressable
testcc.c:26: warning: use of memory input without lvalue in asm operand
3 is deprecated
