Am 2018-12-15 17:19, schrieb John Ralls:
On Dec 15, 2018, at 6:16 AM, c.holterm...@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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