Programming :: Finding G++ Compiler Option To Avoid Forward Declarations
Sep 23, 2010
I am working for a product which was evolved over a decade. There I have some combination of C style coding and C++ coding in same libraries. I am landing on some instances where C style function is expecting forward declarations for some other function for which I can not declare (due to design and architecture). Is there any g++ compiler option that directs the g++ to look whole preprocessed file (because definition is there down in the preprocessed file) than only forward in the preprocessed file. All these years this code is working as we are using CC compiler and that looks entire preprocessed file than only in the forward direction.
if I can not include Header2.h first then Header1.h. I have to include Header1.h and Header2.h because on the design hierarchy in this product. Also the function definitions are in header files as they are either template functions or functions expanded through macros.
I use vim+cscope. Since a struct or a function can be declared many times, when I want to find how it is defined, I'm troubled by a long list of declarations.I use 'cscope f g [def]', and I don't know why declarations are listed.So how can I configure cscope so that declarations won't be listed?
I installed the newest version of Fedora last week using virtual box. I plan on doing some C++ programing(in net-beans) for school but u can't find the compiler any where. I assume their would be one installed when i installed fedora. I found a few websites saying i need to use the package manager to install it. I can't find this package manager i have searched for it. I don't want to go download and try to install a compiler if i already have one
I am using gNewsense, the current compiler installed is gcc 4.2.I need to install and run gcc 2.95.3. I tried everything to install the gcc 2.95.3 version , but infortunately failed. So I am looking for a linux distribution with gcc 2.95.3 as the complier already installed. Does it exist?
I cannot install g++ on my ubuntu...i can't find the option foe the G++ compiler in the Ubuntu Software centre...and while typing G++ in the terminal I get a message that tells me to add some pentium...
My application is developed using GCC and an binary executable created out of it which initializes successfully. By initialization, I meant all the threads in the application are created and I get the required response from the executable. There was a need to create a .so file out of my application instead of binary executable, as it needs to be integrated with another .so file to create a final patch. So we used -fPIC compiler option and created a .so and also an binary executable. But with -fPIC included, the executable fails to initialize at all. It executes some instructions in the main program, before finally haulting down with a " Program received signal SIGSEGV, Segmentation fault." error. And it always fails at the same faulty address which points to nothing in my application code. What is that -fPIC adds to the code, which makes my code fail with strange behaviour.
I have my laptop that is a full time Linux box. (My desktop system which is for gaming is still a windows box). I have been using Ubuntu for about a year now, and while it is a wonderful system, I am getting restless to try something new. The one thing I dislike about Ubuntu is that I really don't like Gnome (personal preference, I can see why some like it). So I was wondering what would be a good Distribution(s) that I can download and play with so see what KDE has done in the last year and perhaps play with Xfce. I have run SUSE and Ubuntu in the past.
I'm facing difficulty while writing to an already existing file . I'm making a shell (programming in C). I want a file (say , logfile) to keep a record of all the commands a user enters. For the first command it runs fine , but for the second time and thereafter it overwrites the previous contents. How do I avoid this?
i was wondering if there is away to avoid application from closing if a specific library not found? for example: if my application uses libPng and it wasn't found on the system running my app (binary and not source), is there anyway to just disable the part that uses png from my application?
I installed Fedora on my machine. I'm very new at Linux but would like to start coding in C++. I would like to know the steps to write and compile a Hello World program using C++ in Linux. (I've been a Microsoft person all my life).
I am using a arm compiler to build my program but getting following compiler error at the end - init.c.text+0x2c): undefined reference to '__libc_csu_fini' init.c.text+0x34): undefined reference to '__libc_csu_init'
I'm reading about GNU CPP(GNU C preprocessor). In the CPP manual -> 1.1 Character sets:
Code: After preprocessing is complete, string and character constants are converted again, into the execution character set. This character set is under control of the user; the default is UTF-8, matching the source character set. I think "under control of the user" means to use the option -fexec-charset=, right? And in the above part, it says pretty clear: "After preprocessing is complete", so the job -- "string and character constants are converted again, into the execution character set" -- should be done by the C compiler(compilation proper), not GNU CPP. Then the option -fexec-charset= should be an option controlling the C compiler, not the preprocessor. But in the GCC manual, this option is listed in the "3.11 Options Controlling the Preprocessor". I don't understand this, If this option is an option controlling the preprocessor, it conflicts with the CPP manual. How to understand this?
I have a large existing codebase that all compiles under Ubuntu 8.04 with g++ using Scons. I've been given the task of getting it to compile for Arm9 running uclinux. I have a arm-elf-g++ compiler that I need to use instead of the gcc version. I ended up borking my /usr/lib/scons/SCons/Tool/g++.py file to use arm-elf-g++ instead of g++, but I know that this is not correct, as I have to go edit that file every time I change compilers.
These are the 2 lines I switch out: Code: compilers = ['arm-elf-g++'] #compilers = ['g++']
I simply can not find anywhere in the scons documentation that indicates how to tell it to use a different compiler. It seems that it would go under "Environment" but beyond that I'm lost. The CPPPATH variable seems like it only tells scons where to find #include files. I suppose I could rename arm-elf-g++ to g++ and just set my path to find that one first, but that seems like a bit of a hack as well. It would also break other things on my machine.
I'm trying to figure out how pthreads are mapped from the compiler to the Linux kernel. The pthread prototypes are found in a compiler header file (pthread.h), yet the kernel would be responsible for scheduling the threads. So, how does the compiler resolve the pthread symbols at compile time?
Trying to start dhcpd reports "no subnet declaration for eth0 (192.168.1.1)" and "no subnet declaration for eth1 (10.100.1.17)". Is dhcpd using /etc/dhcpd.conf, or do I have the wrong config file? If it's right, why is this failing?
I am using makefile to complile all C Programming files. But certain files are not getting compiled and hence its object file is not getting generated. This is happening due to files haven't been modified for a long time. It seems that compiler knows that its object file is there hence no need to complie it actually it is not.
How can I disable structure alignment feature of gcc using command-line options ?I recently migrated to 64-bit OS, and doubt that I might be experiencing a structure alignment problem due to the new 64-bit architecture.I checked the sizes of the same C-style struct in both x86 and x86_64, and found out that they appear to be different by 20 bytes.I am not sure if this is due to structure alignment or the differences in data type lengths between two platforms.Hence, I will first disable the structure alignment feature, and then check the struct sizes again.
So for those of you who has built GCC from source would know that you can't install GCC without an existing GCC. So my question is, what would happen if all computers in the world suddenly just died, and all you had was the computer in front of you, and a copy of GCC 4.5. How would you install that?
I ask because I would like to install GCC 4.5 on my old powerbook G4 mac without installing a binary GCC provided by Tiger 10.4 disks. I would like to build GCC from source, without an existing GCC to complicate updating.
Code: <trus.analytics.platform.model.version>2.0.0-SNAPSHOT</trus.analytics.platform.model.version> with Code: <trus.analytics.platform.model.version>2.0.0-b-20</trus.analytics.platform.model.version> using sed command. Code: sed -i
I think there is a problem with front-slash but not sure how to resolve it.