[Bug 223752] clang __attribute__((constructor)) gets wrong input parameters

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223752

dstaesse <dimitri.staessens at ugent.be> changed:

           What    |Removed                     |Added
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                 CC|                            |dimitri.staessens at ugent.be

--- Comment #1 from dstaesse <dimitri.staessens at ugent.be> ---
Created attachment 188120
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=188120&action=edit
main program code

Sorry, pushed submit too early.

I find that the argc and argv values that are passed to a shared library
constructor for a library that is compiled using clang fails. I get the same
result using FreeBSD 11.0-RELEASE, 11.1-RELEASE and 12-CURRENT

When compiling the attached code using

$clang -c -fPIC attrconst.c 
$clang -shared -o libattrconst.so attrconst.o
$clang -L . main.c -lattrconst -o test

and executing (bash) 
$LD_LIBRARY_PATH=. ./test

I get:
Initializing library.                                                           
Got 3 params.
argv[0] is (null).
Running the test.
Finalizing library.

Which is not what I was expecting.

Compiling the library using gcc, gives the correct result:

$gcc -c -fPIC attrconst.c 
$gcc -shared -o libattrconst.so attrconst.o
$gcc -L . main.c -lattrconst -o test
$LD_LIBRARY_PATH=. ./test
Initializing library.                                                           
Got 1 params.
argv[0] is ./test.
Running the test.
Finalizing library.

Could this be a bug in clang?

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