Programming :: Gc-sections Remove All Function Not Used?
Nov 18, 2010
This is my file, named xxx.c. And there are two functions in it.
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When I try to compile the whole project, I used -ffunction-sections,-fdata-sections to generate the .o files, use Wl,--gc-sections -Wl,--print-gc-sections to link to the exacutable file. gcc 4.3.2 ld 2.18 Debian 5 After the first time I compiled it, I got a list of Removed functions. But one second later, I rememberd that I forget to close the Compile Switch: Debug. Then I had to recompile it and got another list. Compare these two lists, I found that , bxx isn't on the second list. First I guess that bxx is a debug function but never used in debug mode, and it won't be compiled in release mode. I check the source and find that there was no compile switch for bxx. But it's caller function axx, is removed, both the debug switch is on and off. I try to compiled the project for several times , but the result is the same. I can't realized it , why? Is that the --gc-sections won't remove all the functions not used?
I have man properly installed on my boxes (I have ubuntu and debian, I would also be interested in how to do this for fedora) however only section 1 of the man pages is available. How do I install additionally sections? I am particularly in need of sections 2 and 3. command line instructions needed. I don't have a desktop environment on all my boxes.
how to make a site like this one, LinuxQuestions itself - it puts a thin line around each post, to demarcate it - for the website I'm building, I need exactly this functionality. Do I have to use the "gd" library?
As a curious side project I'm playing with mzXML data(an xml format for holding mass spec data). A typical scan can be quite large, even up into GB size. I'm wondering how would one go about parsing an xml file in sections, one section at a time. The idea being if the computer doesn't have enough memory to load up the entire data file, work on chunks of it at a time.
I have a system setup script for my Slackware installations that pulls all packages and source files from another machine and sets everything up to be identical between machines. The script works as expected but make it entirely unattended. How do I make the bash script deal with automatically selecting "Yes" for, for example "Install x(Yes/No): " when prompted by a make file?
I am doing some Linux kernel programming for my research project. I need to record the timestamp (by using cpuid and rdtsc) when an interrupt handler (top half) is first invoked. Due to the time critical nature of the problem itself, I have to do the timestamping inside the interrupt handler itself (the first operation when the handler is called). However, I understand that tasks that are not so time critical should be deferred to a tasklet function (bottom half) for processing because other interrupts are disabled in a (top-half) interrupt handler. I am currently out of idea on how I can pass the timestamp information that I have obtained in the interrupt handler to the corresponding tasklet function.
I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.
#!/bin/bash addelementtoarray() { local arrayname=$1
fit a surface i.e. W(x,y) using svdfit() provided by "Numerical Recipes in C". svdfit() is written for curve fitting and not for surface fitting.But one can use svdfit(), as claimed by authors of NR book, to do surface fitting. On page 680 of NR book, authors have given a hint on how to use svdfit() for fitting a surface. But I have not understood it.This link may be helpful (Chapter 15 th is relevant here.):[URL]This is my problem:
Code: I have a set of 100 numbers. I want to fit a 2-Dimensional function W(x,y) to these numbers.
I just installed ubuntu 9.1 on an inspiron 4000. The screen looks like like its been split and I can't see the options to try to change display options. I have uploaded a picture from my phone. It kinda sucks but it's there. I have tried "sudo dpkg-reconfigure xserver-xorg". this gives me nothing but an empty prompt. I have also tried "sudo nano /etc/X11/xorg.conf". this gives me box where I can type but enter doesn't make it submit, just moves down a line and there is no information there like it seems there should be. I got to the display preferences and it says the monitor is unknown. changing the display resolution does not fix it. FIXED by going here: [URL]...
I just installed ubuntu 9.1 on an inspiron 4000. The screen looks like like its been split and I can't see the options to try to change display options. I can't post pictures here but if you have a way for me to, I have some pictures too.
I have a question about calling an asm function from C....It doesn't work unless I create an asm variable to hold the value of the function in....Why?Here's the code that doesn't work...
asmfile.s - version one Code: .section .data mydata: .ascii "this is the message! .equ mylen, . - mydata
I want to use backtrace() function to debug a crash issue. I tried this sample code to see how backtrace works. backtrace() function always returns 0 with the below code. Is there any kernel configuration that needs to be set for proper working of backtrace?
#include <execinfo.h> #include <stdio.h> #include <stdlib.h> /* Obtain a backtrace and print it to stdout. */ void print_trace (void)
Can you offer me the code about fmod() in C. I want to know how this function work, i am very interested in it because i have no idea to implement it, i want to know... how to write the function... not 'how to use the function' can anyone post the source codes of this function here?
i have an open source application that was developed in C++ (it uses objects and namespaces all over the place). I also have another application that was developed in C. Now i am trying to insert the code made in C into C++ application, but when i do that , i get this error on compilation of the source code:
Code: error: 'mpi_init_vars' was not declared in this scope the function mpi_init_vars() is not part of object oriented programming and it doesn't belong to any scope, it was compiled into an object file and i am linking it with all objects of C++ application.
How can invoke the C function from C++ object oriented code?
Code: #!/bin/sh #System commands and other configurable. IPT=/sbin/iptables IP6T=/sbin/ip6tables IPST=/usr/sbin/ipset MODP=/sbin/modprobe GET=/usr/bin/wget INT_NET=192.168.1.0/24 .....
I can find lots of tutorials in how to use if, then, else. However, how do I define a variable inside the function? SEE>> Code: for c in $ISO Also, am I using the 'test' command correctly( -/+ week as valid test)?
I am doing a web site program and what I need is to call a C program in the PHP cloud.Do u think it would be possible? The web site would get the user input from PHP UI and pass to the C program , the C program would process the function with the user input and output the a PHP page.
Code: return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG); What is the above function returning.I am not clear with definition of what is being returned in the above code.
i want to compile function c in java and compile library is success.. when i call the library in java and error is :
Exception in thread "main" java.lang.UnsatisfiedLinkError: no libfunc.so in java.library.path at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1689) at java.lang.Runtime.loadLibrary0(Runtime.java:823) at java.lang.System.loadLibrary(System.java:1028)
I am not clear with certain sections of apache I saw a default virtual host file. as follows
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What does Directory / here represents is it same as document root or different. The following section where /var/www is included in Directory Index
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I am not clear as why by default ScriptAlias is present in the default vhost is it necessary to keep in other Virtual Hosts. Similarly /doc/ what is this referring to in following section
I've checked and double checked that there is no user and password directive in /etc/my.cnf and ~/.my.cnf but it seems that every time I issue mysql it will drop me into the command line without prompting for a password or giving any pause. Of course, the only table I have access to when doing this is information_schema with read only on most of it and no access on the rest, but I was just wondering where else an auto-login style authentication could be coming from.
I tried to make a (very simple) function to put in my .bashrc file to make a local backup of a file, but when I call the function and try to use tab completion I get the following error: Code: cp: cannot stat `help': No such file or directory The function I added is as follows:
Code: function bk { cp -f --backup=numbered ${1} ${1}.bak
