Another option is to use BUILD_SHARED_LIBS to control static vs. shared. Set
it to false on MSVC and true everywhere else, then omit the library type in the
add_library calls that you wish to have controllable behaviour. Those
add_library calls will then consult BUILD_SHARED_LIBS to determine whether to
generate a static or shared lib.
________________________________
From: CMake <cmake-boun...@cmake.org> on behalf of David Aldrich
<david.aldrich.n...@gmail.com>
Sent: November 7, 2019 3:52 AM
To: Petr Kmoch <petr.km...@gmail.com>
Cc: CMake MailingList <cmake@cmake.org>
Subject: Re: [CMake] Using generator expression with add_library
Thank you. So I guess I can make it as simple as:
if(MSVC)
add_library(${_star_lib_name} STATIC "")
else()
add_library(${_star_lib_name} SHARED "")
endif()
I just wondered if there was a more elegant way.
On Thu, Nov 7, 2019 at 11:45 AM Petr Kmoch
<petr.km...@gmail.com<mailto:petr.km...@gmail.com>> wrote:
Hi.
The argument STATIC or SHARED is processed at CMake configure time (that is,
when CMake is executing the add_library() command). However, generator
expressions are only evaluated at generate time, which comes only after all
CMake code is processed.
Fortunately for you, compiler ID is something that is already known at
configure time, meaning you don't need to use a genex to read it. You can just
do this:
if(MSVC)
set(LibType STATIC)
else()
set(LibType SHARED)
endif()
add_library(
${_star_lib_name}
${LibType}
...
)
(Feel free to modify the if(), use CMAKE_<LANG>_COMPILER_ID
(https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_COMPILER_ID.html) etc.
as necessary).
Petr
On Thu, 7 Nov 2019 at 12:28, David Aldrich
<david.aldrich.n...@gmail.com<mailto:david.aldrich.n...@gmail.com>> wrote:
I want to build a shared library for Linux and a static library for Windows. So
I have tried:
set (_star_lib_name "StdStars")
add_library(${_star_lib_name}
$<$<CXX_COMPILER_ID:GNU>:SHARED>
$<$<CXX_COMPILER_ID:MSVC>:STATIC>
""
)
but that gives me error:
CMake Error at
C:/SVNProj/zodiac/branches/TRY_TML_CMake_3Oct2019/StarLibs/StdStars/CMakeLists.txt:7
(add_library):
Cannot find source file:
STATIC
Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
.hpp .hxx .in .txx
What is the correct way of doing this please?
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