This has nothing to do with DEAL_II_WITH_GMSH. That feature is only
required if you use functionality from the Gmsh namespace
(https://www.dealii.org/developer/doxygen/deal.II/namespaceGmsh.html).
The error message
The violated condition was:
in
Additional information:
An input/output error has occurred.
occurs when the .msh file is not found. Does the file exist in the
current folder?
On Tue, Dec 15, 2020 at 1:48 PM Aaditya Lakshmanan
<aaditya8...@gmail.com> wrote:
>
> Hi,
> You probably also need to supply the flag -DDEAL_II_WITH_GMSH=ON in the
> cmake line.
>
> Best,
> Aaditya
>
> On Tuesday, December 15, 2020 at 1:21:00 PM UTC-5 husain.u...@gmail.com wrote:
>>
>>
>> Hello Deal.II community,
>> I am working on deal.II via the VM image (release 9.1.1). I am having
>> trouble reading the .msh file. I even tried running running step 49 and
>> received this error:
>>
>> ----------------------------------------------------
>> Exception on processing:
>>
>> --------------------------------------------------------
>> An error occurred in line <1408> of file
>> </home/ubuntu/deal.II/dealii/source/grid/grid_in.cc> in function
>> void dealii::GridIn<dim, spacedim>::read_msh(std::istream&) [with int
>> dim = 2; int spacedim = 2; std::istream = std::basic_istream<char>]
>> The violated condition was:
>> in
>> Additional information:
>> An input/output error has occurred. There are a number of reasons why
>> this may be happening, both for reading and writing operations.
>>
>> If this happens during an operation that tries to read data: First, you may
>> be trying to read from a file that doesn't exist or that is not readable
>> given its file permissions. Second, deal.II uses this error at times if it
>> tries to read information from a file but where the information in the file
>> does not correspond to the expected format. An example would be a truncated
>> file, or a mesh file that contains not only sections that describe the
>> vertices and cells, but also sections for additional data that deal.II does
>> not understand.
>>
>> If this happens during an operation that tries to write data: you may be
>> trying to write to a file to which file or directory permissions do not
>> allow you to write. A typical example is where you specify an output file in
>> a directory that does not exist.
>> --------------------------------------------------------
>>
>> Aborting!
>> ----------------------------------------------------
>>
>> I checked the detailed.log file and found DEAL_II_WITH_GMSH is OFF.
>> I also tried to install the latest version of gmsh (4.7.1) and ran the cmake
>> command for deal ii installation with -DGMSH_DIR=/path/to/gmsh added to it.
>> But it gives me warning
>>
>> CMake Warning:
>> Manually-specified variables were not used by the project:
>>
>> GMSH_DIR
>>
>> Can someone please suggest if I am missing anything here?
>
> --
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--
Timo Heister
http://www.math.clemson.edu/~heister/
--
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