https://sourceware.org/bugzilla/show_bug.cgi?id=24574
Bug ID: 24574
Summary: extern symbols in dlls are misleading under debugger
Product: binutils
Version: 2.31
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: sbence92 at gmail dot com
Target Milestone: ---
Host: x86-64-mingw32
Target: x86-64-mingw32
Build: x86-64-mingw32
Created attachment 11782
--> https://sourceware.org/bugzilla/attachment.cgi?id=11782&action=edit
example
With binutils 2.31 and later extern symbols in DLLs point to junk when
inspected under a debugger. The source of the problem seems to be ld because
the bug is reproducible with ld 2.31 and gdb 8.3 but it isn't with ld 2.30 with
same gdb.
If your run make all in the attached example (after specifying the your
toolchain) you find the the address of pcode_st is different in
productionCode.dll and test.dll under a debugger.
If you change extern prodCode_st pcode_st; in test.cpp to
__declspec(dllimport) prodCode_st pcode_st; the problem goes away.
linking with --enable-auto-import does not help.
toolchain for reproduction: mingw64 gcc 8.3 from msys2 + binutils 2.31.1 from
http://repo.msys2.org/mingw/x86_64/
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