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<p class="MsoNormal">LLVM_ENABLE_EH is a global option, not a target property. For a single target, it’s more appropriate to use LLVM_REQUIRES_EH, which is also a variable you’ll need to set before calling add_llvm_component_library. You can do something like<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">set(LLVM_REQUIRES_EH_ORIGINAL ${LLVM_REQUIRES_EH})<o:p></o:p></p>
<p class="MsoNormal">set(LLVM_REQUIRES_EH YES)<o:p></o:p></p>
<p class="MsoNormal">add_llvm_component_library(LLVMTargetLibrary<o:p></o:p></p>
<p class="MsoNormal"> TargetFile1.cpp<o:p></o:p></p>
<p class="MsoNormal"> TargetFile2.cpp<o:p></o:p></p>
<p class="MsoNormal"> )<o:p></o:p></p>
<p class="MsoNormal">set(LLVM_REQUIRES_EH ${LLVM_REQUIRES_EH_ORIGINAL})<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The implementation for this functionality lives in llvm/cmake/modules/AddLLVM.cmake [1], where you can see what effect LLVM_REQUIRES_EH has.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[1] <a href="https://github.com/llvm/llvm-project/blob/master/llvm/cmake/modules/AddLLVM.cmake">
https://github.com/llvm/llvm-project/blob/master/llvm/cmake/modules/AddLLVM.cmake</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">llvm-dev <llvm-dev-bounces@lists.llvm.org> on behalf of "Davis, Alan via llvm-dev" <llvm-dev@lists.llvm.org><br>
<b>Reply-To: </b>"Davis, Alan" <adavis@ti.com><br>
<b>Date: </b>Sunday, January 12, 2020 at 5:09 PM<br>
<b>To: </b>LLVM Developers Mailing List <llvm-dev@lists.llvm.org><br>
<b>Subject: </b>[llvm-dev] how to enable exceptions for one component<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I’d like to enable exceptions for a single target-specific LLVM component which is built as library. That is, I’d like to allow it to throw exceptions to its (non-LLVM) client to signal errors. In the CMakeLists.txt for the component, I
tried: <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">add_llvm_component_library(LLVMTargetLibrary<o:p></o:p></p>
<p class="MsoNormal"> TargetFile1.cpp<o:p></o:p></p>
<p class="MsoNormal"> TargetFile2.cpp<o:p></o:p></p>
<p class="MsoNormal"> )<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">set_property(TARGET LLVMTargetLibrary PROPERTY LLVM_ENABLE_EH ON)
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">But it still compiles with –fno-exceptions.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks for any advice.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">-Alan<o:p></o:p></p>
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