Hi,
The problem happened after upgrade to lttng-ust 2.13.0. 2.12.0 don't have this issue.
liburcu version: 0.13.0
gcc: 11.2.0
This is my reproduce steps, it is cross compile enviroment based
on yocto project.
compile failed with error:
|
/work/cortexa15t2hf-neon-poky-linux-gnueabi/lttng-ust/2_2.13.0-r0/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi/../../libexec/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/11.2.0/ld:
../../../src/lib/lttng-ust/.libs/liblttng-ust.so: undefined
reference to `_uatomic_link_error'
| collect2: error: ld returned 1 exit status
| Makefile:399: recipe for target 'test_ust_error' failed
checked with "nm
../../../src/lib/lttng-ust/.libs/liblttng-ust.so" | grep atomic,
we can see 'U _uatomic_link_error', but since -Og
is used, liburcu don't define this function.
[snip]
#if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR
static inline __attribute__((always_inline, noreturn))
void _uatomic_link_error(void)
{
#ifdef ILLEGAL_INSTR
/*
* generate an illegal instruction. Cannot catch this with
* linker tricks when optimizations are disabled.
*/
__asm__ __volatile__(ILLEGAL_INSTR);
#else
__builtin_trap();
#endif
}
#else /* #if !defined __OPTIMIZE__ || defined
UATOMIC_NO_LINK_ERROR */
extern void _uatomic_link_error(void);
#endif /* #else #if !defined __OPTIMIZE__ || defined
UATOMIC_NO_LINK_ERROR */
[snip]
we cannot see 'U _uatomic_link_error' in following conditions, so compile successed:
1. without -Og(using -O2), + 32bit arm
2. -Og + 64bit arm
3. -Og + x86/x86-64
Do you have any idea about how to fix this? I don't understand why only "-Og + 32bit arm" will call function _uatomic_link_error.
Thanks
//Changqing