[Bug ld/19803] gc-sections breaks PE DLL variable export

[martin.koegler at chello dot at]

https://sourceware.org/bugzilla/show_bug.cgi?id=19803

--- Comment #9 from martin.koegler at chello dot at ---
I have reworked the first version a little bit.

The DEF-handling looks OK. SEH prevents the removal of a function, 

Get dx.s from Comment #2.

t1.s:
=============
        .file   "t1.c"
        .section        .text.unlikely,"x"
.LCOLDB0:
        .text
.LHOTB0:
        .p2align 4,,15
        .globl  add
        .def    add;    .scl    2;      .type   32;     .endef
        .seh_proc       add
add:
        .seh_endprologue
        ret
        .seh_endproc
        .section        .text.unlikely,"x"
.LCOLDE0:
        .text
.LHOTE0:
        .ident  "GCC: (GNU) 5.3.0"
===============

dx.def:
=============
EXPORTS
    testval @1 DATA
=============

x86_64-w64-mingw32-as -o t1.o t1.s
x86_64-w64-mingw32-as  -o dx.o  dx.s
x86_64-w64-mingw32-ld -o dx.dll -shared dx.o t1.o --print-gc-sections 
--out-implib  dx.dll.a --gc-sections dx.def 

t1 is not removed, until the .seh statements are removed from t1.s.

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