Re: [ft] Fw: Could you help me for debugging FreeType library?

2019-05-03 Thread J Decker 
On Fri, May 3, 2019 at 6:14 PM Lawrence D'Oliveiro 
wrote:

> On Fri, 3 May 2019 03:00:25 +, suzuki toshiya wrote:
>
> > BTW, does cmake have any hardwired database for
> > the available flags for each compilers? I can check
> > for gcc and clang, but I'm not sure about other
> > proprietary compilers...
>
> I thought most C compilers supported at least some small core of
> GCC-compatible flags, including “-g” for generating debugging symbols
> and “-D” for defining preprocessor symbols that can be queried in the
> code. Plus of course the usual ones for specifying library and include
> paths. You can do a lot with just these.
>

Re CMake

Yes, and generally cmake provides those with the default flags by
compiler/generator/toolchain file.

[Dd][Ee][Bb][Uu][Gg]  includes -g , no optimization, and default flags if
the compiler uses them (_DEBUG)
[Rr][Ee][Ll][Ee][Aa][Ss][Ee] includes optimization, does not comiple with
symbols, and would be (NDEBUG)
RelWithDebInfo - includes optimization, but also debug information
MinSize - Extra optimzation, no symbols/debugging.

Unfortunatly, RelWithDebInfo on MSVC does also include multi-threaded-debug
runtime, so it's not very 'Release'.  This can be overridden...

But generally the default flags for compiler/generator selected in cmake
switch with CMAKE_BUILD_TYPE

There are Visutal Studio/Xcode/... multi-configuration generators, but they
don't really support multiple install outputs, so it's almost always
easiest to just make a new build per configuration like makefiles and only
build the appropriate configuration for that target.

(I wonder if there's somehow a way to disable generation of parallel
targets)

I find that with VS now, even Release gets PDB debugging information
associated with it so you can debug/step through things you've compiled.





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Re: [ft] Fw: Could you help me for debugging FreeType library?

2019-05-03 Thread Lawrence D'Oliveiro 
On Fri, 3 May 2019 03:00:25 +, suzuki toshiya wrote:

> BTW, does cmake have any hardwired database for
> the available flags for each compilers? I can check
> for gcc and clang, but I'm not sure about other
> proprietary compilers...

I thought most C compilers supported at least some small core of
GCC-compatible flags, including “-g” for generating debugging symbols
and “-D” for defining preprocessor symbols that can be queried in the
code. Plus of course the usual ones for specifying library and include
paths. You can do a lot with just these.

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Re: [ft] Fw: Could you help me for debugging FreeType library?

2019-05-03 Thread suzuki toshiya 
BTW, recent macOS does not ship gdb as a part of their SDK anymore,
and it seems that they have switched to lldb. are you using gdb?

Regards,
mpsuzuki

suzuki toshiya wrote:
> Hi,
> 
> It seems that cmake experts have left FreeType, so I try to respond
> you although I'm not an expert.
> 
> The shortest response would be: "CMakeLists.txt of FreeType does not
> support Debug build, so your attempt would not work". Nothing to say,
> the maintainers would welcome the proposal of patch, could you draft
> something?
> 
> --
> following is longer response.
> 
> My first question is: cmake has any predefined compiler flag set for
> CMAKE_C_FLAGS_DEBUG? By brief checking of cmake manual, it seems that
> the effect of CMAKE_BUILD_TYPE "Debug" is only the reflection of the
> CMAKE_C_FLAGS_DEBUG option in the compilation. I cannot find any
> predefined set of CMAKE_C_FLAGS_DEBUG from the manual, and in my
> experiment on macOS, no typical debug options like "-g" is given to.
> I'm afraid default value of CMAKE_C_FLAGS_DEBUG is empty, so, nothing
> special happened (please try "make VERBOSE=1" to check the commands
> are being issued).
> 
> In my impression, expecting "I set CMAKE_BUILD_TYPE to Debug, so the
> softwares should be built for debug mode" is something like a person
> wondering as "I changed the suffix of teacup.txt from txt to jpg, so
> I get teacup.jpg, but my browser does not show the picture of teacup.
> why?". In the package of the softwares whose CMakeLists.txt is ready
> for debug build, -DCMAK_BUILD_TYPE=Debug might work, but FT is not such.
> 
> Regards,
> mpsuzuki
> 
> Werner LEMBERG wrote:
>> Please help this guy.
>>
>>
>> Werner
>>
>>
>> 
> 
>> Hi Werner Lemberg:
>>
>> I am work focus rendering 2d text ,so I want to study your Project 
>> "FreeType",
>>
>> so I write a program ,use it to test "FreeType".
>>
>>
>> First of all,I git sources of FreeType,compile it to libfreetype.dylib on 
>> MacOS use Cmake:
>>
>>
>> I modified CMakeLists.txt of FreeType and add a line :
>>
>> SET(CMAKE_BUILD_TYPE "Debug")
>>
>> then use cmake compile,
>> ---?
>> mkdir build
>> cd build
>> cmake -D BUILD_SHARED_LIBS:BOOL=true ..
>> make
>> sudo make install?
>> ---
>>
>>
>>
>> Second I write a  test program  on MacOS.
>>
>>
>>
>>
>> But I can't use gdb by command line to debugging into libfreetype.dylib!
>>
>>
>> Can you help me ?
>>
>>
>> Thans a lot.
>>
>>
>> Best regards.
>>
>>
>> 韩忠涛
>> 终端网络部  大播放内核
>>
>> 爱奇艺公司   iQIYI, Inc.
>> 地址：北京市海淀区中关村大街甲1号鼎好电子大厦A座9层
>> 邮编：100080
>> 手机：＋86 13661073959
>> 邮箱：hanzhong...@qiyi.com
>>
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