Error #540 Support For Exception Handling Is Disabled
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Rohit Grover. 25 replies Daniel Peter # 20 Feb 2010 Hi all I'm trying to port some code with a try ... catch block for exception handling, and get the message "Support for exception handling is disabled; use --exceptions to enable (E540)".
Error: Cannot Use 'try' With Exceptions Disabled
Would it be normal to have exception handling available for use with a device error: exception handling disabled, use fexceptions to enable like the mbed, or does this add some kind of unacceptable overhead? If it would be ok, how do we access the clang enable exceptions switch - I'm guessing that a lot of options are locked down because of the web interface to the compiler. ThanksDanielPS I never did like "on error goto" so please don't tell me that's a
Fexceptions C++
workaround ;-) Simon Ford # 20 Feb 2010 Hi Daniel, The conventional wisdom (and the advice from the armcc compiler guys) is that the overhead of exceptions is pretty high and therefore not appropriate for this sort of domain. For now, we are therefore not supporting exceptions (it is hard to remove support, but easy to add it). We'll definitely look at really understanding the space and time overheads at some point (mbed
Use -fexceptions To Enable
isn't really conventional, so perhaps exceptions are perfect!), but for now you'll have to stick to more conventional exception handling approaches. Simon Juergen Hausmann # 18 Oct 2010 Hi Simon, I wonder if exceptions handling is available meanwhile. Could you please give me a status? Thank you in advance and best regards Juergen Simon Ford # 18 Oct 2010 Hi Juergen, We don't support exception handling in the compiler, and it is not planned to add it. But i'd be happy to hear about how you usually use them in your microcontroller applications, or your experiences! But for now, you will have to turn to more standard C solutions. Thanks, Simon Juergen Hausmann # 19 Oct 2010 Hello Simon, thank you for your answer. Unfortunately my robotics specialist who developped a 3-axis robotic conversion matrix calculation for me where "divide by zero, ..." errors in the matrix calculation should be catched, checked the mbed infos before starting the software development and found support of exception handling for mbed: He found there: http://mbed.org/handbook/mbed-Compiler the link to the "ARM RVDS (v4.0)" : http://www.arm.com/products/tools/software-tools/rvds/arm-compiler.php where under "Accurate Code Generation" he found: "[...] The default library selected by the ARM Compiler offers a full complement of C/C++ functionality, including C++ exception handling and IEEE 754 floating point suppor
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Fexceptions Android
handling disabled, use -fexceptions to enable #17 Closed mojodna opened this Issue Feb 11, 2012 · clang error cannot use throw with exceptions disabled 13 comments Projects None yet Labels None yet Milestone No milestone Assignees No one assigned 7 participants mojodna commented Feb 11, 2012 • edited I'm https://developer.mbed.org/forum/mbed/topic/523/ trying to update zeromq.node to use gyp as part of the process of getting it running on Windows (JustinTulloss/zeromq.node#81). I'm currently blocked by gyp's -fno-exceptions default (I think), but will probably run into linking issues soon enough. Here's binding.gyp: { 'targets': [ { 'target_name': 'binding', 'sources': [ 'binding.cc' ], 'cflags': ['-fexceptions'], 'cflags_cc': ['-fexceptions'] } ] } https://github.com/nodejs/node-gyp/issues/17 Here's a transcript: seth@lotus:~/src/JustinTulloss/zeromq.node [⚡ gyp] $ node-gyp configure --target=0.7 info it worked if it ends with ok spawn python [ '/Users/seth/.node-gyp/0.7/tools/gyp_addon', '-f', 'make', '--suffix', '.gyp', '-I', '/Users/seth/.node-gyp/0.7/tools/patch2722.gypi', '-Dtarget_arch=x64' ] info done ok seth@lotus:~/src/JustinTulloss/zeromq.node [⚡ gyp] $ node-gyp build info it worked if it ends with ok spawn make [ 'BUILDTYPE=Release', '-f', 'Makefile.gyp' ] CXX(target) out/Release/obj.target/binding/binding.o binding.cc: In constructor ‘zmq::Context::Context(int)’: binding.cc:185: error: exception handling disabled, use -fexceptions to enable make: *** [out/Release/obj.target/binding/binding.o] Error 1 ERR! `make` failed with exit code: 2 ERR! not ok TooTallNate commented Feb 11, 2012 • edited Hey @mojodna. So the -fno-exceptions flag comes from node's common.gypi file. The following is supposed to negate that, try adding: ... 'cflags!': [ '-fno-exceptions' ], 'cflags_cc!': [ '-fno-exceptions' ] ... The ! at the end is supposed to make sure that that flag is not used. Let me know if that works. The real solution however would be to remove all instances of C++-style throw statements. That's what I did for node-ffi, but I
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