Thanks Dan

The CL is useful.

On Tuesday, July 20, 2021 at 10:58:21 PM UTC+8 Dan Willemsen wrote:

> One fix for this is to move over to using an Android.bp to build your app 
> rather than an Android.mk 🙂
>
> But I also submitted a fix for this into aosp/master last week: 
> https://android-review.googlesource.com/c/platform/build/+/1764131
>
> - Dan
>
> On Tue, Jul 20, 2021 at 9:42 AM [email protected] <
> [email protected]> wrote:
>
>> Hi ,
>>
>> Our Android 11 build has been failing randomly with the following error:
>>
>> *> cp: cannot create regular file 
>> 'out/target/common/R/androidx/vectordrawable/R.java': > File exists*
>>
>>
>> then, We found the reason for the compilation failure in build/make/core/
>> definitions.mk:
>>
>> define find-generated-R.java
>> $(hide) for GENERATED_MANIFEST_FILE in `find $(1) \
>>   -name Manifest.java 2> /dev/null`; do \
>>     dir=`awk '/package/{gsub(/\./,"/",$$2);gsub(/;/,"",$$2);print 
>> $$2;exit}' $$GENERATED_MANIFEST_FILE`; \
>>     mkdir -p $(TARGET_COMMON_OUT_ROOT)/R/$$dir; \
>>     cp $$GENERATED_MANIFEST_FILE $(TARGET_COMMON_OUT_ROOT)/R/$$dir; \
>>   done;
>> $(hide) for GENERATED_R_FILE in `find $(1) \
>>   -name R.java 2> /dev/null`; do \
>>     dir=`awk '/package/{gsub(/\./,"/",$$2);gsub(/;/,"",$$2);print 
>> $$2;exit}' $$GENERATED_R_FILE`; \
>>     mkdir -p $(TARGET_COMMON_OUT_ROOT)/R/$$dir; \
>> *    cp $$GENERATED_R_FILE $(TARGET_COMMON_OUT_ROOT)/R/$$dir \*
>> *      || exit 31; \*
>>     cp $$GENERATED_R_FILE $(2) || exit 32; \
>>   done;
>> @# Ensure that the target file is always created, i.e. also in case we 
>> did not
>> @# enter the GENERATED_R_FILE-loop above. This avoids unnecessary 
>> rebuilding.
>> $(hide) touch $(2)
>> endef
>>
>> When two or more unrelated modules depend on a module that needs to be 
>> compiled ç¼–by appt2, multiple files with the same name will be copied to the 
>> same directory.
>> When the compilation time of these modules overlaps, the copy operation 
>> conflicts, which leads to the failure of the build
>>
>> We also check the aosp master, it may has the same issue 
>>
>> B/R
>> Raymond
>>
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