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  • Why is the volatile qualifier used through out std::atomic?

    - by Caspin
    From what I've read from Herb Sutter and others you would think that volatile and concurrent programming were completely orthogonal concepts, at least as far as C/C++ are concerned. However, in GCC c++0x extension all of std::atomic's member functions have the volatile qualifier. The same is true in Anthony Williams's implementation of std::atomic. So what's deal, do my atomic<> variables need be volatile or not?

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  • inline assembly error

    - by Manish
    I am using inline assembly for iphone, I working for device debug mode. The instruction is as follows: __asm__("smlatb %0, %1, %2 ,%3 \n\t": "=r"(Temp): "r"(treg5) : "r"(fac5) : "r"(Temp) ); And I am getting an errors: error : expected ')' before tokedn '(' error: unknown register name 'r' in 'asm' I am using X-code 3.0 and gcc 4.0. Any ideas?

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  • Recommended Clang command line options

    - by frou
    The Manual for Clang seems to be work in progress, so could you help me formulate the definitive command line options for compiling ANSI-C (AKA C89, C90) with maximum strictness and relevant/helpful warnings? Clang is a compiler front end for the C, C++, and Objective-C programming languages. It uses the Low Level Virtual Machine (LLVM) as its back end. It is still under development. Its goal is to offer a replacement to the GNU Compiler Collection (GCC)

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  • Error after installing Django (supposed PATH or PYTHONPATH "error")

    - by illuminated
    Hi all, I guess this is a PATH/PYTHONPATH error, but my attempts failed so far to make django working. System is Ubuntu 10.04, 64bit: mx:~/webapps$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=10.04 DISTRIB_CODENAME=lucid DISTRIB_DESCRIPTION="Ubuntu 10.04 LTS" Python version: 2.6.5: @mx:~/webapps$ python -V Python 2.6.5 When I run django-admin.py, the following happens: mx:~/webapps$ django-admin.py Traceback (most recent call last): File "/usr/local/bin/django-admin.py", line 2, in <module> from django.core import management ImportError: No module named django.core Similar when I import django in python shell: mx:~/webapps$ python Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import django Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named django >>> quit() More details: mx:~/webapps$ python -c "from distutils.sysconfig import get_python_lib; print get_python_lib()" /usr/lib/python2.6/dist-packages Within python shell: Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> print sys.path ['', '/usr/lib/python2.6/dist-packages/django', '/usr/local/lib/python2.6/dist-packages/django/bin', '/usr/local/lib/python2.6/dist-packages/django', '/home/petra/webapps', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages/PIL', '/usr/lib/pymodules/python2.6'] django-admin.py can be found here: mx:~/webapps$ locate django-admin.py ~/install/sources/Django-1.2.1/build/lib.linux-i686-2.6/django/bin/django-admin.py ~/install/sources/Django-1.2.1/build/scripts-2.6/django-admin.py ~/install/sources/Django-1.2.1/django/bin/django-admin.py /usr/local/bin/django-admin.py /usr/local/lib/python2.6/dist-packages/django/bin/django-admin.py /usr/local/lib/python2.6/dist-packages/django/bin/django-admin.pyc and in the end this doesn't help: export PYTHONPATH="/usr/lib/python2.6/dist-packages/django:$PYTHONPATH" nor this: export PYTHONPATH="/usr/local/lib/python2.6/dist-packages/django:$PYTHONPATH" How to solve this !? Thanks all in advance! :)

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  • Errors Installing PIL on Mac OS Tiger

    - by john2x
    I'm trying to install the Python Imaging Library on Mac OS X 10.4, but I get errors. I'm not sure where the error starts, it's just a huge wall of text when executing sudo python setup.py install. But the last few lines are: ... collect2: ld returned 1 exit status lipo: can't open input file: /var/tmp//ccNKvQpP.out (No such file or directory) error: command 'gcc' failed with exit status 1 I've googled, but none of the results are working.

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  • memcpy vs assignment in C

    - by SetJmp
    Under what circumstances should I expect memcpys to outperform assignments on modern INTEL/AMD hardware? I am using GCC 4.2.x on a 32 bit Intel platform (but am interested in 64 bit as well).

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  • #warning in Visual Studio

    - by paleozogt
    In gcc I can do compile-time warnings like this: #if !defined(_SOME_FEATURE_) #warning _SOME_FEATURE_ not defined-- be careful! #endif But in Visual Studio this doesn't work. Is there an alternative syntax for #warning?

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  • How to configure Eclipse with CDT?

    - by Burkhard
    Hello, I've been trying to use CDT with Eclipse 3.4 under Windows XP with cygwin. What do I need to do, in order to get startet? I used "eclipse-cpp-ganymede-SR1-win32.zip" found on the Eclipse homepage. Edit: The main problem is, that I cannot compile and run the code. In the run configuration, I tried gcc.exe for the C/C++ Application: After adding the path of make.exe to my $Path, and starting from scratch, it works perfectly.

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  • c declaring variables in blocks

    - by anon
    I know that in C++, I can declare variables pretty much everywhere. I recall once reading that in C, variables must be declared at the top of a function i.e. the following is invalid: void foo() { int good; if (...) { int bad; } } In the above code, is the declaraing of the bad varaible legal by C standards, or only legal due to a gcc extension? Thanks!

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  • c declaraing varibles in blocks

    - by anon
    I know that in C++, I can declare variables pretty much everywhere. I recall once reading that in C, variables must be declared at the top of a function i.e. the following is invalid: void foo() { int good; if (...) { int bad; } } In the above code, is the declaraing of the bad varaible legal by C standards, or only legal due to a gcc extension? Thanks!

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  • boost::bind breaks strict-aliasing rules?

    - by Kyle
    Using Boost 1.43 and GCC 4.4.3, the following code boost::bind(&SomeObject::memberFunc, this, _1)); Generates the following warning boost/function/function_base.hpp:321: warning: dereferencing type-punned pointer will break strict-aliasing rules What's the correct way to eliminate these warnings without setting -fno-strict-aliasing?

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  • How to make this Makefile more concise?

    - by David
    I know there are ways to remove duplicates in Makefile. Can you tell me how to make the Makefile below more concise? Thanks! And is there any tool to automate it? CC=gcc CFLAGS=-pthread -g -o all: dotprod_mutex dotprod_serial dotprod_mutex: dotprod_mutex.c $(CC) $(CFLAGS) dotprod_mutex dotprod_mutex.c dotprod_serial: dotprod_serial.c $(CC) $(CFLAGS) dotprod_serial dotprod_serial.c

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  • how to read scanf with spaces

    - by Matias
    I'm having a weird problem i'm trying to read a string from a console with scanf() like this scanf("%[^\n]",string1); but it doesnt read anything. it just skips the entire scanf. I'm trying it in gcc compiler

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  • Automating GNUStep from Notepad++

    - by kim3er
    I use GNUStep to compile Objective-C on Windows 7 using GCC and MinGW. I'd like to be able to automate the "make" instruction (with make files) from Notepad++ and have any complier errors reported to Notepad++s console window. Does anyone have any experience with this? Rich

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  • An interview question on conditional operator

    - by nthrgeek
    I recently encountered with this question: How to reduce this expression: s73?61:60;. The hint given was that Instead of using conditional operator we could use a simple comparison which will work fine. I am not sure but I think it is possible with some GCC extension,although I am unable to figure it out myself. EDIT:The whole expression is this : s-=s73?61:60

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  • "range of" in if condition C programming

    - by Samantha
    Hello, I'm working on a simple C prorgam, and i'ms tuck with an if test: int line_number = 0; if ((line_number >= argv[2]) && (line_number <= argv[4]) ) gcc says: cp.c:25: warning: comparison between pointer and integer cp.c:25: warning: comparison between pointer and integer What can I do to properly write the range of line I want to deal with ? Thank you!

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  • multiple definition of inline function

    - by K71993
    Hi, I have gone through some posts related to this topic but was not able to sort out my doubt completly. This might be a very navie question. Code Description I have a header file "inline.h" and two translation unit "main.cpp" and "tran.cpp". Details of code are as below inline.h file details #ifndef __HEADER__ #include <stdio.h> extern inline int func1(void) { return 5; } static inline int func2(void) { return 6; } inline int func3(void) { return 7; } #endif main.c file details are below #define <stdio.h> #include <inline.h> int main(int argc, char *argv[]) { printf("%d\n",func1()); printf("%d\n",func2()); printf("%d\n",func3()); return 0; } tran.cpp file details (Not that the functions are not inline here) #include <stdio.h> int func1(void) { return 500; } int func2(void) { return 600; } int func3(void) { return 700; } Question The above code does not compile in gcc compiler whereas compiles in g++ (Assuming you make changes related to gcc in code like changing the code to .c not using any C++ header files... etc). The error displayed is "duplicate definition of inline function - func3". Can you clarify why this difference is present across compile? When you run the program (g++ compiled) by creating two seperate compilation unit (main.o and tran.o and create an executable a.out), the output obtained is 500 6 700 Why does the compiler pick up the definition of the function which is not inline. Actually since #include is used to "add" the inline definiton I had expected 5,6,7 as the output. My understanding was during compilation since the inline definition is found, the function call would be "replaced" by inline function definition. Can you please tell me in detailed steps the process of compilation and linking which would lead us to 500,6,700 output. I can only understand the output 6. Thanks in advance for valuable input.

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  • Error while compiling the Xcode project (IPhone)

    - by Sridhar
    Hello, I added ffmpeg iphone port into my library and I can able to use a few of its functions like avcodec_init(),.. without any errors. But when I include this function call "avcodec_register_all" Xcode is giving error after compilation The error message is : *--------------- ld: ldr 12-bit displacement out of range (4276 max +/-4096) in _CFRelease$stub in _CFRelease$stub from /Users/foxit/Documents/CameraTest/build/CameraTest.build/Debug-iphoneos/CameraTest.build/Objects-normal/armv6/CameraTest Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1 *------------- Does anyone know whats wrong with this ? Regards, Raghu

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  • Example compilers

    - by saf
    I'm searching for the source code of a compiler capable of creating Win32 programs from an input program in a programming language (It doesn't matter which, maybe the simpler the better) Yet I can't find anything right for me and huge compilers like GCC make me extremely confused as they have so many features that I don't know where to start. Is there an OpenSource Win32 micro-compiler for some programming language out there I could take a look at?

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  • Using Crypt32 with Dev-Cpp - Unable to link to CryptUnprotectData

    - by jgworks
    While trying to compile the example code from 'Example C Program: Using CryptProtectData' I ran into a roadblock; The linker cannot find CryptUnprotectData. Here is the console output: Compiler: Default compiler Building Makefile: "C:\Dev-Cpp\test\Makefile.win" Executing make... make.exe -f "C:\Dev-Cpp\test\Makefile.win" all gcc.exe main.o -o "Project1.exe" -L"C:/Dev-Cpp/lib" -l crypt32 main.o(.text+0xcb):main.c: undefined reference to `CryptProtectData' main.o(.text+0x121):main.c: undefined reference to `CryptUnprotectData' collect2: ld returned 1 exit status make.exe: *** [Project1.exe] Error 1 Execution terminated

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