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From: "aladjev.andrew at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/99741] New: dllexport attribute is not compatible with c99
 inline
Date: Tue, 23 Mar 2021 21:48:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99741

            Bug ID: 99741
           Summary: dllexport attribute is not compatible with c99 inline
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: aladjev.andrew at gmail dot com
  Target Milestone: ---

Created attachment 50466
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50466&action=3Dedit
fit.tar.gz

Hello, please review the following cmake issue here
https://gitlab.kitware.com/cmake/cmake/-/issues/21940#note_925715.

I am trying to create cross platform application, than I need to compile it
using MSVC. MSVC requires mandatory dllexport and dllimport attributes for =
all
functions including C99 inline functions. Clang is completely ignoring these
attributes in GNU env and it is always successful
https://github.com/llvm/llvm-project/commit/606bd6dcc547cf2f9fd7387321db794=
19bf60041.
GCC ignores only dllimport attribute, but fails with dllexport attribute.

Please review simplified project: a1.h, a1.c, a2.c and CMakeLists.txt attac=
hed.
You can try to build it on windows using:

CC=3D"gcc" cmake -G "Unix Makefiles" -DCMAKE_VERBOSE_MAKEFILE=3D1 . && make
CC=3D"clang" cmake -G "Unix Makefiles" -DCMAKE_VERBOSE_MAKEFILE=3D1 . && ma=
ke

GCC provides error: multiple definition of func. I can't understand the rea=
son
of this error: maybe dllexport converted C99 inline declaration into C89?

Workaround for this issue is to remove dllexport attribute for windows plat=
form
+ gcc on makefile generator layer (cmake/etc).

PS this issue is indirectly related to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90161=