[GNC-dev] debug info

c.holtermann at gmx.de c.holtermann at gmx.de
Thu Dec 20 15:10:13 EST 2018


Am 2018-12-15 17:19, schrieb John Ralls:
>> On Dec 15, 2018, at 6:16 AM, c.holtermann at gmx.de wrote:
>> 
>> Hello,
>> 
>> when debugging for my recent pull request #439 I needed to use
>> gdb. When compiling the maint branch from github I didn't have debug
>> information (line numbers) in gdb. I needed to add them by including
>> the -g flag in CMakelLists.txt. I did it only for c and not for c++.
>> Patch below for illustrative purposes.
>> 
>> Wouldn't it be good to have a command line option or environment
>> variable to enable that debug information for c and c++ ?
> 
> Christoph,
> 
> Of course. That’s why Cmake provides CMAKE_BUILD_TYPE. To make a debug
> build, add the argument -D CMAKE_BUILD_TYPE=Debug to your cmake
> invocation.
> 
> BTW, the flags passed to the compilers are also modifiable from the
> command line using CMAKE_C_FLAGS and CMAKE_CXX_FLAGS. No need to
> change CMakeLists.txt.
> 
> Should you ever need to do this for an autotools project the
> equivalents are the environment variables CFLAGS and CXXFLAGS;
> autotools also reads CPPFLAGS and applies the contents to both c and
> c++ compiles. Autotools unfortunately doesn’t have an equivalent to
> CMAKE_BUILD_TYPE so you have to adjust the compiler flags.
> 
> Regards,
> John Ralls

John,

thank you for that. It was very helpful. I think I didn't find this 
information
on the wiki. Maybe I overlooked it but I'll see if I can add it to the 
wiki.

regards,

Christoph Holtermann


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