Hi Bruce,
When I excuted "make -C /usr/src/kernel scripts prepare" on target
mechine, I will be asked for choicing if to enable "GCC_PLUGINS" and
other configurations depend on "GCC_PLUGINS" (The .config file doesn't
contain 'GCC_PLUGINS is not set')
But there were never be asked for these before yocto add the
configuration which is "EXTRA_OEMAKE += " HOSTCXX="${BUILD_CXX}
${BUILD_CXXFLAGS} ${BUILD_LDFLAGS}""
With these, I met a failure during compiling an external module on
target mechine after I enabled the GCC_PLUGINS and
CONFIG_GCC_PLUGIN_RANDSTRUCT by above methond. Failure messages as
below. There might be some other unexpected situations with GCC_PLUGIN
enabled.
In my oppinion, GCC_PLUGINS is rarely used, and It can be enable by who
want to use it. So how about disable it by defualt in ktypes/base
/base.cfg file? Do you think it is appropriate?
======================cut here===============================
$ make -C /usr/src/kernel scripts prepare
......
\ * GCC plugins
*
GCC plugins (GCC_PLUGINS) [Y/n/?] (NEW) y
Generate some entropy during boot and runtime
(GCC_PLUGIN_LATENT_ENTROPY) [N/y/?] (NEW) y
Randomize layout of sensitive kernel structures (GCC_PLUGIN_RANDSTRUCT)
[N/y/?] (NEW) y
Use cacheline-aware structure randomization
(GCC_PLUGIN_RANDSTRUCT_PERFORMANCE) [N/y/?] (NEW) y
*
\ * Memory initialization
*
Initialize kernel stack variables at function entry
> 1. no automatic initialization (weakest) (INIT_STACK_NONE)
2. zero-init structs marked for userspace (weak)
(GCC_PLUGIN_STRUCTLEAK_USER) (NEW)
3. zero-init structs passed by reference (strong)
(GCC_PLUGIN_STRUCTLEAK_BYREF) (NEW)
4. zero-init anything passed by reference (very strong)
(GCC_PLUGIN_STRUCTLEAK_BYREF_ALL) (NEW)
choice[1-4?]: 1
Poison kernel stack before returning from syscalls
(GCC_PLUGIN_STACKLEAK) [N/y/?] (NEW) y
Minimum stack frame size of functions tracked by STACKLEAK
(STACKLEAK_TRACK_MIN_SIZE) [100] (NEW)
Show STACKLEAK metrics in the /proc file system (STACKLEAK_METRICS)
[N/y/?] (NEW) y
Allow runtime disabling of kernel stack erasing
(STACKLEAK_RUNTIME_DISABLE) [N/y/?] (NEW) y
Enable heap memory zeroing on allocation by default
(INIT_ON_ALLOC_DEFAULT_ON) [N/y/?] n
Enable heap memory zeroing on free by default (INIT_ON_FREE_DEFAULT_ON)
[N/y/?] n
HOSTCC scripts/dtc/dtc.o
......
==
then build the module,
==
$ make -C /usr/src/kernel M=/module_path/module_example modules
Build external kernel module ...
make: Entering directory '/lib/modules/5.4.57-yocto-standard/build'
CC [M] /module_path/module_example/hello.o
Building modules, stage 2.
MODPOST 1 modules
ERROR: "module_layout" [/module_path/module_example/hello.ko] undefined!
make[1]: *** [scripts/Makefile.modpost:94: __modpost] Error 1
make: *** [Makefile:1630: modules] Error 2
make: Leaving directory '/lib/modules/5.4.57-yocto-standard/build'
==
Regards,
Yanfei
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