User forums > General (but related to Code::Blocks)
something about M_PI
coutnut:
Hi! Guys, nice to meet u all here.
I am really new to CBs. and I am learning programing in the structure of OpenCASCADE. Typically, I should use VS2019. However my computer is a little bit old, if I use the VS2019, sometimes it'll crash. So I aim to program with CBs, language is cpp.
Here is the problem. I got a gp_Dir2d.lxx which uses M_PI.
I defineed ||#define D_USE_MATH_DEFINES || and || #define _USE_MATH_DEFINES || ,|| #include <math.h> || but error came out : 'M_PI' was not declared in this scope.
I am really confused. What should I do to fix it? (PS:this works in VS2019,BUT I really need a lighter IDE!)
stahta01:
Sounds like an Compiler and Code::Blocks (C::B) configuration related issue.
Therefore the Compiler Toolchain info is needed. NOTE: C::B is not an Compiler.
Operating System (OS) including 64 or 32 bit might also be needed.
Example info expected is:
Compiler: GCC (Rev5, Built by MSYS2 project) 10.3.0
C::B Version: svn-r12452
OS Info: Microsoft Windows 7 64 bit
From C::B Help -> About (Information Tab)
--- Code: ---Name : Code::Blocks
Version : svn-r12452
SDK Version : 2.9.0
Scintilla Version : 3.7.5
Author : The Code::Blocks Team
E-mail : info@codeblocks.org
Website : http://www.codeblocks.org
OS : Windows 7 (build 7601, Service Pack 1), 64-bit edition
Scaling factor : 1.000000
Detected scaling factor : 1.000000
Display PPI : 96x96
Display count : 1
Display 0 (\\.\DISPLAY1): XY=[0,0]; Size=[1366,768]; Primary
wxWidgets Library (wxMSW port)
Version 3.1.5 (Unicode: wchar_t, debug level: 1),
compiled at Apr 25 2021 09:56:34
Runtime version of toolkit used is 6.1.
--- End code ---
I am 80 percent sure the problem is caused by using GCC with a non standard file extension of "lxx".
But, I have no idea about how to fix the problem.
Posting the build log might help an expert to help you. NOTE: Build Log not Build messages
Edit: Add example build log
--- Code: ----------------- Build: Debug in testpi (compiler: GNU GCC Compiler)---------------
x86_64-w64-mingw32-g++.exe -Wall -fexceptions -pedantic -std=c++17 -g -c C:/Users/stahta01/test/testpi/main.cpp -o obj/Debug/main.o
x86_64-w64-mingw32-g++.exe -o bin/Debug/testpi.exe obj/Debug/main.o
Output file is bin\Debug\testpi.exe with size 143.26 KB
Process terminated with status 0 (0 minute(s), 5 second(s))
0 error(s), 0 warning(s) (0 minute(s), 5 second(s))
--- End code ---
Tim S.
stahta01:
The file "gp_Dir2d.lxx" that I found in opencascade project was never meant to be treated as a source file as in being compiled.
Instead it should be treated as a header file and the compiling and linking turned off for the file.
So, the file extension of "lxx" should not be a problem. Still waiting for a build log!
Tim S.
sodev:
M_PI is not part of the C standard but part of POSIX. Most probably the OP is using GCC and that one is more strict regarding the standard. Using a C standard with GNU extensions does help in that case, e.g. instead of using --std=c11 use --std=gnu11.
coutnut:
--- Quote from: stahta01 on September 07, 2021, 11:45:49 pm ---The file "gp_Dir2d.lxx" that I found in opencascade project was never meant to be treated as a source file as in being compiled.
Instead it should be treated as a header file and the compiling and linking turned off for the file.
So, the file extension of "lxx" should not be a problem. Still waiting for a build log!
Tim S.
--- End quote ---
Thanks for you guys' replies!
I'm really appreciate that!
Sorry to response so late, I was temporarily working on some other stuff in the past months. Give me the pardon!
Also something wrong with my pc, so I rebuild the project. The error still exists.
Here is part of build log, and I using "..." to replace the fullpath
Also, the 12 errors are all the same.
--- Code: ---...\opencascade-7.5.0\inc/gp_Vec.lxx: In member function 'Standard_Boolean gp_Vec::IsParallel(const gp_Vec&, Standard_Real) const':
...\opencascade-7.5.0\inc/gp_Vec.lxx:111:39: error: 'M_PI' was not declared in this scope
return Ang <= AngularTolerance || M_PI - Ang <= AngularTolerance;
^
Process terminated with status 1 (0 minute(s), 1 second(s))
12 error(s), 0 warning(s) (0 minute(s), 1 second(s))
--- End code ---
--- Quote from: sodev on September 08, 2021, 04:30:47 pm ---M_PI is not part of the C standard but part of POSIX. Most probably the OP is using GCC and that one is more strict regarding the standard. Using a C standard with GNU extensions does help in that case, e.g. instead of using --std=c11 use --std=gnu11.
--- End quote ---
Actually, I use the GNU GCC Compiler in the project.
As for the compiler flags, I picked the -std=c++11.
But error remains.
By the way, I tried to include math.h instead of cmath, this still happens.
Attachment is the pic of the compiler flags.
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