[Bug ld/21703] The first symbol definition is overwritten by second definition when --allow-multiple-definition is provieded

[renlin.li at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21703

--- Comment #6 from Renlin Li <renlin.li at arm dot com> ---
I create a test case to show the bug.

arm-none-eabi-gcc main_arm.c -O2 -march=armv7-a -mfloat-abi=softfp
-specs=aprofile-validation.specs -c -o main_arm.o
arm-none-eabi-gcc  -O2 -mthumb -march=armv7-a -mfloat-abi=softfp
-specs=aprofile-validation.specs -c foo_arm.c -o foo_arm.o
arm-none-eabi-gcc  -O2 -mthumb -march=armv7-a -mfloat-abi=softfp
-specs=aprofile-validation.specs -c foo_thumb.c -o foo_thumb.o

arm-none-eabi-gcc main_arm.o foo_thumb.o foo_arm.o
-specs=aprofile-validation.specs  -o main.exe  -Wl,--allow-multiple-definition

In this case, we would expect in main.exe, the function get called is the thumb
version, and BLX is used to do the function call.

But BL is used to call the thumb function.
I have checked weak symbol and dynamic symbol are properly handled.

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