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• Compiler is able to find function without matching .h file is updated?

  - by Maxim Veksler

  Hello Friends, I'm writing a C University project and stumbled upon a compiler behavior which I don't understand. In this file http://code.google.com/p/openu-bsc-maximveksler/source/browse/trunk/20465/semester/tasks/maman14/alpha/maman14/assembler/phaseOne.c?r=112 I've added a call to function named freeAsmInstruction(). This function is defined in file named lineParser.c, yet I haven't updated the matching lineParser.h header file to include this function declaration. Why does this code compile? I would expect that gcc would fail to compile phaseOne.c until the correct lineParser.h is updated with the declaration of freeAsmInstruction(). I would appreciate an explanation. Thank you, Maxim

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• Compile 32bit mercurial on x86_64

  - by krashalot

  I'm using the academic version of EPD (Enthought Python Distribution) which is 32bit. My computer is Linux x86_64. platform.architecture() returns ('32bit','ELF') I want to install Mercurial. The instructions in README didn't work at first, because make gave this error: "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)." I commented out that line in pyport.h and then it compiled fine. Now, after successful compilation I get this error when running it: ImportError: /scratch/epd/lib/python2.6/site-packages/mercurial/osutil.so: wrong ELF class: ELFCLASS64 It appears that I compiled a 64bit version of hg, and it won't run with my 32bit python. I don't see any arch flags in the mercurial makefile. How can I force it to compile in 32bit mode?

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• Portable applications for phones?

  - by peoro

  What's the best way to write an application in order to get it working on the several phones out there (iPhone, symbian-based, xpPhone, and so on)? The idea I have in mind is that of writing a few interfaces to abstract from phone-dependent stuff (ie: some Input/Output interfaces), implementing such interfaces on the several phones and then writing an application that doesn't use any phone-dependent thing. But is this really possible? What would be the language I should choose for my interfaces and applications? (would love to use C++, hopefully even with GCC extensions) Is there any project that aims to offer what I need? (maybe something like SDL?)

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• Efficiency of data structures in C99 (possibly affected by endianness)

  - by Ninefingers

  Hi All, I have a couple of questions that are all inter-related. Basically, in the algorithm I am implementing a word w is defined as four bytes, so it can be contained whole in a uint32_t. However, during the operation of the algorithm I often need to access the various parts of the word. Now, I can do this in two ways: uint32_t w = 0x11223344; uint8_t a = (w & 0xff000000) >> 24; uint8_t b = (w & 0x00ff0000) >> 16; uint8_t b = (w & 0x0000ff00) >> 8; uint8_t d = (w & 0x000000ff); However, part of me thinks that isn't particularly efficient. I thought a better way would be to use union representation like so: typedef union { struct { uint8_t d; uint8_t c; uint8_t b; uint8_t a; }; uint32_t n; } word32; Using this method I can assign word32 w = 0x11223344; then I can access the various parts as I require (w.a=11 in little endian). However, at this stage I come up against endianness issues, namely, in big endian systems my struct is defined incorrectly so I need to re-order the word prior to it being passed in. This I can do without too much difficulty. My question is, then, is the first part (various bitwise ands and shifts) efficient compared to the implementation using a union? Is there any difference between the two generally? Which way should I go on a modern, x86_64 processor? Is endianness just a red herring here? I could inspect the assembly output of course, but my knowledge of compilers is not brilliant. I would have thought a union would be more efficient as it would essentially convert to memory offsets, like so: mov eax, [r9+8] Would a compiler realise that is what happening in the bit-shift case above? If it matters, I'm using C99, specifically my compiler is clang (llvm). Thanks in advance.

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• Failed to convert a wmv file to mp4 with ffmpeg

  - by Olaf Erlandsen

  i need a help with this command FFMPEG COMMAND: ffmpeg -y -i /input.wmv -vcodec libx264 -acodec libfaac -ac 2 -bufsize 20M -sameq -f mp4 /output.mp4 Output: ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers built on Oct 9 2012 07:04:08 with gcc 4.4.6 (GCC) 20120305 (Red Hat 4.4.6-4) [wmv3 @ 0x16a4800] Extra data: 8 bits left, value: 0 Guessed Channel Layout for Input Stream #0.0 : stereo Input #0, asf, from '/input.wmv': Metadata: WMFSDKVersion : 11.0.5721.5275 WMFSDKNeeded : 0.0.0.0000 IsVBR : 0 Duration: 00:01:35.10, start: 0.000000, bitrate: 496 kb/s Stream #0:0(spa): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, s16, 64 kb/s Stream #0:1(spa): Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 320x240, 425 kb/s, SAR 1:1 DAR 4:3, 29.97 tbr, 1k tbn, 1k tbc [libx264 @ 0x16c3000] VBV bufsize set but maxrate unspecified, ignored [libx264 @ 0x16c3000] using SAR=1/1 [libx264 @ 0x16c3000] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 [libx264 @ 0x16c3000] profile High, level 1.3 [libx264 @ 0x16c3000] 264 - core 128 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 [wmv3 @ 0x16a4800] Extra data: 8 bits left, value: 0 Output #0, mp4, to '/output.mp4': Metadata: WMFSDKVersion : 11.0.5721.5275 WMFSDKNeeded : 0.0.0.0000 IsVBR : 0 encoder : Lavf54.29.104 Stream #0:0(spa): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 30k tbn, 29.97 tbc Stream #0:1(spa): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s Stream mapping: Stream #0:1 -> #0:0 (wmv3 -> libx264) Stream #0:0 -> #0:1 (wmav2 -> libfaac) Press [q] to stop, [?] for help [libfaac @ 0x16b3600] Que input is backward in time [mp4 @ 0x16bb3a0] st:0 PTS: 6174 DTS: 6174 < 7169 invalid, clipping frame= 144 fps=0.0 q=29.0 size= 207kB time=00:00:03.38 bitrate= 500.3kbits/s frame= 259 fps=257 q=29.0 size= 447kB time=00:00:07.30 bitrate= 501.3kbits/s frame= 375 fps=248 q=29.0 size= 668kB time=00:00:11.01 bitrate= 496.5kbits/s frame= 487 fps=241 q=29.0 size= 836kB time=00:00:14.85 bitrate= 460.7kbits/s frame= 605 fps=240 q=29.0 size= 1080kB time=00:00:18.92 bitrate= 467.4kbits/s frame= 719 fps=238 q=29.0 size= 1306kB time=00:00:22.80 bitrate= 469.2kbits/s frame= 834 fps=237 q=29.0 size= 1546kB time=00:00:26.52 bitrate= 477.3kbits/s frame= 953 fps=237 q=29.0 size= 1763kB time=00:00:30.27 bitrate= 477.0kbits/s frame= 1071 fps=237 q=29.0 size= 1986kB time=00:00:34.36 bitrate= 473.4kbits/s frame= 1161 fps=231 q=29.0 size= 2160kB time=00:00:37.21 bitrate= 475.4kbits/s frame= 1221 fps=220 q=29.0 size= 2282kB time=00:00:39.53 bitrate= 472.9kbits/s frame= 1280 fps=212 q=29.0 size= 2392kB time=00:00:41.16 bitrate= 476.1kbits/s frame= 1331 fps=203 q=29.0 size= 2502kB time=00:00:43.23 bitrate= 474.1kbits/s frame= 1379 fps=195 q=29.0 size= 2618kB time=00:00:44.72 bitrate= 479.6kbits/s frame= 1430 fps=189 q=29.0 size= 2733kB time=00:00:46.34 bitrate= 483.0kbits/s frame= 1487 fps=184 q=29.0 size= 2851kB time=00:00:48.40 bitrate= 482.6kbits/s frame= 1546 fps=180 q=26.0 size= 2973kB time=00:00:50.43 bitrate= 482.9kbits/s frame= 1610 fps=177 q=29.0 size= 3112kB time=00:00:52.40 bitrate= 486.5kbits/s frame= 1672 fps=174 q=29.0 size= 3231kB time=00:00:54.35 bitrate= 487.0kbits/s frame= 1733 fps=171 q=29.0 size= 3348kB time=00:00:56.51 bitrate= 485.3kbits/s frame= 1792 fps=169 q=29.0 size= 3459kB time=00:00:58.28 bitrate= 486.2kbits/s frame= 1851 fps=166 q=29.0 size= 3588kB time=00:01:00.32 bitrate= 487.2kbits/s frame= 1910 fps=164 q=29.0 size= 3716kB time=00:01:02.36 bitrate= 488.1kbits/s frame= 1972 fps=162 q=29.0 size= 3833kB time=00:01:04.45 bitrate= 487.1kbits/s frame= 2032 fps=161 q=29.0 size= 3946kB time=00:01:06.40 bitrate= 486.8kbits/s frame= 2091 fps=159 q=29.0 size= 4080kB time=00:01:08.35 bitrate= 488.9kbits/s frame= 2150 fps=158 q=29.0 size= 4201kB time=00:01:10.54 bitrate= 487.9kbits/s frame= 2206 fps=156 q=29.0 size= 4315kB time=00:01:12.39 bitrate= 488.3kbits/s frame= 2263 fps=154 q=29.0 size= 4438kB time=00:01:14.21 bitrate= 489.9kbits/s frame= 2327 fps=154 q=29.0 size= 4567kB time=00:01:16.16 bitrate= 491.2kbits/s frame= 2388 fps=152 q=29.0 size= 4666kB time=00:01:18.48 bitrate= 487.0kbits/s frame= 2450 fps=152 q=29.0 size= 4776kB time=00:01:20.24 bitrate= 487.6kbits/s frame= 2511 fps=151 q=29.0 size= 4890kB time=00:01:22.15 bitrate= 487.6kbits/s frame= 2575 fps=150 q=29.0 size= 5015kB time=00:01:24.42 bitrate= 486.6kbits/s frame= 2635 fps=149 q=29.0 size= 5130kB time=00:01:26.62 bitrate= 485.2kbits/s frame= 2695 fps=148 q=29.0 size= 5258kB time=00:01:28.65 bitrate= 485.9kbits/s frame= 2758 fps=147 q=29.0 size= 5382kB time=00:01:30.64 bitrate= 486.4kbits/s frame= 2816 fps=147 q=29.0 size= 5521kB time=00:01:32.69 bitrate= 487.9kbits/s get_buffer() failed Error while decoding stream #0:0: Invalid argument frame= 2848 fps=143 q=-1.0 Lsize= 5787kB time=00:01:35.10 bitrate= 498.4kbits/s video:5099kB audio:581kB subtitle:0 global headers:0kB muxing overhead 1.884230% [libx264 @ 0x16c3000] frame I:12 Avg QP:22.64 size: 12092 [libx264 @ 0x16c3000] frame P:1508 Avg QP:25.39 size: 2933 [libx264 @ 0x16c3000] frame B:1328 Avg QP:30.62 size: 491 [libx264 @ 0x16c3000] consecutive B-frames: 10.0% 80.8% 8.1% 1.1% [libx264 @ 0x16c3000] mb I I16..4: 1.8% 72.1% 26.0% [libx264 @ 0x16c3000] mb P I16..4: 0.4% 2.4% 0.3% P16..4: 48.3% 19.6% 19.3% 0.0% 0.0% skip: 9.5% [libx264 @ 0x16c3000] mb B I16..4: 0.1% 0.2% 0.0% B16..8: 52.6% 6.6% 2.3% direct: 1.4% skip:36.8% L0:48.8% L1:42.5% BI: 8.7% [libx264 @ 0x16c3000] 8x8 transform intra:75.3% inter:55.4% [libx264 @ 0x16c3000] coded y,uvDC,uvAC intra: 77.9% 81.7% 33.1% inter: 24.2% 11.6% 1.1% [libx264 @ 0x16c3000] i16 v,h,dc,p: 25% 16% 44% 14% [libx264 @ 0x16c3000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 15% 29% 6% 5% 6% 6% 7% 7% [libx264 @ 0x16c3000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 15% 17% 7% 9% 8% 9% 7% 7% [libx264 @ 0x16c3000] i8c dc,h,v,p: 50% 19% 24% 7% [libx264 @ 0x16c3000] Weighted P-Frames: Y:3.8% UV:1.1% [libx264 @ 0x16c3000] ref P L0: 75.6% 19.1% 4.2% 1.0% 0.1% [libx264 @ 0x16c3000] ref B L0: 98.1% 1.9% 0.0% [libx264 @ 0x16c3000] ref B L1: 98.9% 1.1% [libx264 @ 0x16c3000] kb/s:439.47 FFMPEG Configuration: --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-gpl --enable-postproc --enable-nonfree libavutil 51. 73.101 / 51. 73.101 libavcodec 54. 59.100 / 54. 59.100 libavformat 54. 29.104 / 54. 29.104 libavdevice 54. 2.101 / 54. 2.101 libavfilter 3. 17.100 / 3. 17.100 libswscale 2. 1.101 / 2. 1.101 libswresample 0. 15.100 / 0. 15.100 libpostproc 52. 0.100 / 52. 0.100 PROBLEM #1: [libfaac @ 0x16b3600] Que input is backward in time [mp4 @ 0x16bb3a0] st:0 PTS: 6174 DTS: 6174 < 7169 invalid, clipping PROBLEM #2: get_buffer() failed Error while decoding stream #0:0: Invalid argument

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• How to build sqlite for Python 2.4?

  - by Verrtex

  I would like to use pysqlite interface between Python and sdlite database. I have already Python and SQLite on my computer. But I have troubles with installation of pysqlite. During the installation I get the following error message: error: command 'gcc' failed with exit status 1 As far as I understood the problems appears because version of my Python is 2.4.3 and SQLite is integrated in Python since 2.5. However, I also found out that it IS possible to build sqlite for Python 2.4 (using some tricks, probably). Does anybody know how to build sqlite for Python 2.4? As another option I could try to install higher version of Python. However I do not have root privileges. Does anybody know what will be the easiest way to solve the problem (build SQLite fro Python 2.4, or install newer version of Python)? I have to mention that I would not like to overwrite the old version version of Python. Thank you in advance.

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• Is there any way to get MSVC to pass structs arguments in registers on x64?

  - by Luke

  For a function with signature: struct Pair { void *v1, *v2 }; void f(Pair p); compiled on x64, I would like Pair's fields to be passed via register, as if the function was: void f(void *v1, void *v2); Compiling a test with gcc 4.2.1 for x86_64 on OSX 10.6, I can see this is exactly what happens by examining the disassembly. However, compiling with MSVC 2008 for x64 on Windows, the disassembly shows that Pair is passed on the stack. I understand that platform ABIs can prevent this optimization; does anyone know any MSVC-specific annotations, calling conventions, flags, or other hacks that can get this to work? Thank you!

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• how to run fastcgi

  - by joels

  I have fastcgi installed and running. I downloaded a developerkit from fastcgi.com. It had some examples in it. One of the example files echos some stuff. It required a .libs and a .deps I put those folders along with a echo.fcgi file and into the webroot/cgi-bin. If I got to the echo.fcgi url, it works great. I created a simple c file that prints hello world. I compile it using gcc -Wall -o main -lfcgi main.c What do I do with it now? Does it require something like a perl script or php script to be executed. Or, should I just be able to put it in the webroot/cgi-bin folder and go to it's url?

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• Allocated memory address clash

  - by Louis

  Hi, i don't understand how this happen. This is portion of my code.. int isGoal(Node *node, int startNode){ int i; . . } When i debug this using gdb i found out that 'i' was allocated at the memory address that have been previously allocated. (gdb)print &node->path->next $26 = (struct intNode **) 0xffbff2f0 (gdb) print &i $22 = (int *) 0xffbff2f0 node-path-next has been already defined outside this function. But as u can see they share the same address which at some point make the pointer point to another place when the i counter is changed. I compiled it using gcc on solaris platform Any helps would be really appreciated..

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• How to reduce compilation times with Boost Asio

  - by Artyom

  Boost.Asio is great library but it has one huge drawback -- extreamly slow compilation times. A simple implementation (really simple) of HTTP protocol (about 1k lines of code) requires about 13.5s to compile under GCC 4.4! I tryed to use PCH but it does not improve compilation times too much (about 1s. only). So are there any tutorials on how to make Boost.Asio compilation times faster? For example what headers should I exactly include for what class. I use for example: io_service, tcp::ip::sockets, tcp::ip::acceptor, deadline_timer, buffers and few functions like async_read, async_write. Any suggestions? P.S.: I do use pimpl whenever I can.

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• Boost python module building

  - by Ockonal

  Hello, I'm using boost.python and I need in building some module for it. I have an some_module.cpp file in project. How can I build it correctly to the shared library for using it with python in future? When I learned it, I had only 1 file and I built it with command: gcc -shared -Wl,-soname,hello.so -o hello.so test.cpp -I /usr/include/python2.6/ -lboost_python And I don't know how to configure it in whole project. I'm using Eclipse and Code::Blocks IDEs.

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• IOKit header assert.h gone? [answered]

  - by Julian Kessel

  I want to get the hardware address of my mac's ethernet card. In all samples I saw in include on IOKit/assert.h . Which doesn't seem to exist on my system. GCC throws an error saying he doesn't know the type IOEthernetAddress. Is assert.h necessary for my task? It would be great if someone coud give me a working sample. [edit] here's my code, think this will help understanding the problem: #include <IOKit/assert.h> #include <IOKit/network/IOEthernetController.h> #include <IOKit/network/IOEthernetInterface.h> int main(){ IOEthernetAddress addr; getHardwareAddress(&addr); printf("%x", addr); return 0; }

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• OS X contains heapsort in stdlib.h which conflicts with heapsort in sort library

  - by CryptoQuick

  I'm using Ariel Faigon's sort library, found here: http://www.yendor.com/programming/sort/ I was able to get all my code working on Linux, but unfortunately, when trying to compile with GCC on Mac, its default stdlib.h contains another heapsort, which unfortunately results in a conflicting types error. Here's the man page for Apple heapsort: http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/heapsort.3.html Commenting out the heapsort in the sort library header causes a whole heap of problems. (pardon the pun) I also briefly thought of commenting out my use of stdlib.h, but I use malloc and realloc, so that won't work at all. Any ideas?

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• something wrong in my program by using GData xmlsupport

  - by ben

  Ld build/Debug-iphonesimulator/newParser.app/newParser normal i386 cd /Users/apple/Desktop/newParser setenv MACOSX_DEPLOYMENT_TARGET 10.5 setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.sdk -L/Users/apple/Desktop/newParser/build/Debug-iphonesimulator -F/Users/apple/Desktop/newParser/build/Debug-iphonesimulator -filelist /Users/apple/Desktop/newParser/build/newParser.build/Debug-iphonesimulator/newParser.build/Objects-normal/i386/newParser.LinkFileList -mmacosx-version-min=10.5 -lxml2 -framework Foundation -framework UIKit -framework CoreGraphics -o /Users/apple/Desktop/newParser/build/Debug-iphonesimulator/newParser.app/newParser Undefined symbols: "_kGDataXMLXPathDefaultNamespacePrefix", referenced from: _kGDataXMLXPathDefaultNamespacePrefix$non_lazy_ptr in GDataXMLNode.o (maybe you meant: _kGDataXMLXPathDefaultNamespacePrefix$non_lazy_ptr) ld: symbol(s) not found collect2: ld returned 1 exit status

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• my version of strlcpy

  - by robUK

  Hello, gcc 4.4.4 c89 My program does a lot of string coping. I don't want to use the strncpy as it doesn't nul terminate. And I can't use strlcpy as its not portable. Just a few questions. How can I put my function those its paces to ensure that it is completely safe and stable. Unit testing? Is this good enough for production? size_t s_strlcpy(char *dest, const char *src, const size_t len) { size_t i = 0; /* Always copy 1 less then the destination to make room for the nul */ for(i = 0; i < len - 1; i++) { /* only copy up to the first nul is reached */ if(*src != '\0') { *dest++ = *src++; } else { break; } } /* nul terminate the string */ *dest = '\0'; /* Return the number of bytes copied */ return i; } Many thanks for any suggestions,

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• Undefined symbol sunOglCurPrimTablePtr in Solaris-x86

  - by yowkee

  I was porting a C++ program from Solaris Sparc to Solaris x86. The program utilizes OpenGL library and the compilation is performed in a Sun Ultra27 workstation with the default GCC (3.4.3) and OpenGL library come with the machine. However, the following OpenGL call couldn't found while linking: Undefined symbol first referenced in file sunOglCurPrimTablePtr ../../lib/libgltt.so sunOglCurrentContext ../../lib/libgltt.so which, both sunOglCurPrimTablePtr and sunOglCurrentContext should be available in the default OpenGL library /usr/lib/libGL.so (links to /usr/X11/lib/NVIDIA/libGL.so.1). But I couldn't find anything from it: > nm /usr/lib/libGL.so /usr/lib/libGL.so: Searching on web, SUN or Nvidia didn't lead to any helpful resource. Any clue or helps? Thanks!

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• What are some tips for troubleshooting builds of complicated software?

  - by Goose Bumper

  Sometimes I want to build Python or GCC from scratch just for fun, but I can't parse the errors I get, or don't understand statements like "libtool link error # XYZ". What are some tricks that unix/systems gurus use to compile software of this size from scratch? Of course I already do things like read config.log (if there is one), google around, and post in newsgroups. I'm looking for things that either make the process go smoother or get me more information about the error to help me understand and fix it. It's a little tough to get this information sometimes, because some compile bugs can be quite obscure. What can I do at that point?

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• Should you remove all warnings in your Verilog or VHDL design? Wh or why not?

  - by Brian Carlton

  In (regular) software I have worked at companies where the gcc option -Wall is used to show all warnings. Then they need to be dealt with. With non-trivial FPGA/ASIC design in Verilog or VHDL there are often many many warnings. Should I worry about all of them? Do you have any specific techniques to suggest? My flow is mainly for FPGAs (Altera and Xilinx in particular), but I assume the same rules would apply to ASIC design, possibly more so due to the inability to change the design after it is built.

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• Linux core dumps are too large!

  - by themoondothshine

  Hey guys, Recently I've been noticing an increase in the size of the core dumps generated by my application. Initially, they were just around 5MB in size and contained around 5 stack frames, and now I have core dumps of 2GBs and the information contained within them are no different from the smaller dumps. Is there any way I can control the size of core dumps generated? Shouldn't they be at least smaller than the application binary itself? Binaries are compiled in this way: Compiled in release mode with debug symbols (ie, -g compiler option in GCC). Debug symbols are copied onto a separate file and stripped from the binary. A GNU debug symbols link is added to the binary. At the beginning of the application, there's a call to setrlimit which sets the core limit to infinity -- Is this the problem?

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• How to format a function pointer?

  - by Longpoke

  Is there any way to print a pointer to a function in ANSI C? Of course this means you have to cast the function pointer to void pointer, but it appears that's not possible?? #include <stdio.h> int main() { int (*funcptr)() = main; printf("%p\n", (void* )funcptr); printf("%p\n", (void* )main); return 0; } $ gcc -ansi -pedantic -Wall test.c -o test test.c: In function 'main': test.c:6: warning: ISO C forbids conversion of function pointer to object pointer type test.c:7: warning: ISO C forbids conversion of function pointer to object pointer type $ ./test 0x400518 0x400518 It's "working", but non-standard...

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• Errors/warnings passing int/char arrays by reference

  - by Ankur Banerjee

  I'm working on a program where I try to pass parameters by reference. I'm trying to pass a 2D int array and a 1D char array by reference. Function prototype: void foo (int* (&a)[2][2], char* (&b)[4]) Function call: foo (a, b); However, when I compile the code with -ansi and -Wall flags on gcc, I get the following errors: foo.c: At top level: error: expected ‘)’ before ‘&’ token error: expected ‘;’, ‘,’ or ‘)’ before ‘char’ foo.c: In function ‘main’: error: too many arguments to function ‘foo’ I've stripped out the rest of the code of my program and concentrated on the bits which throw up the errors. I've searched around on StackOverflow and tried out different ways to pass the parameters, but none of them seem to work. (I took this way of passing parameters from the discussion on StackOverflow here.) Could you please tell me where I'm going wrong?

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• shared libraries creating a soft link

  - by robUK

  Hello, Redhat 5.5 gcc version 4.1.2 I have a directory call lib, and in that directory I have all the shared libraries (about 30) that we get from our customer as we use their API. We link with this API. directory structure: /usr/CSAPI/lib However, our customer will update their API so we get new libraries, normally about 3 or 4. What I have been doing is when I get new libraries. Is to remove the old one and put in another directory. And replace them with the new libaries in the lib directory. /usr/CSAPI/Old_libs The new and old will have the same name. i.e. libcs.so < old libcs.so < new Is there a better way to manage this? I was thinking of creating a soft line, but as the names are the same, I am not sure that this will work. Many thanks,

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• Are fopen/fread/fgets PID-safe in C ?

  - by Jane

  Various users are browsing through a website 100% programmed in C (CGI). Each webpage uses fopen/fgets/fread to read common data (like navigation bars) from files. Would each call to fopen/fgets/fread interefere with each other if various people are browsing the same page ? If so, how can this be solved in C ? (This is a Linux server, compiling is done with gcc and this is for a CGI website programmed in C.) Example: FILE *DATAFILE = fopen(PATH, "r"); if ( DATAFILE != NULL ) { while ( fgets( LINE, BUFFER, DATAFILE ) ) { /* do something */ } }

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• Stackless installation and configuration with DJango

  - by crashekar

  I am trying to run a DJango Command Extension which uses stackless. I have installed Stackless Python (compiled with python 2.5) so whenever I type python2.5 at the console it fires up indicating that the version is Python 2.5.2 Stackless 3.1b3 060516 (python-2.52:72942, May 26 2009, 23:07:34) [GCC 4.3.3] on linux2 But in my eclipse I have configured my django application to run with python2.6. Specifically in the PyDev settings. So obviously when I mention import stackless it says that there is no such package. The problem is even if I add the '/usr/local/lib/python2.5/site-packages' directory it does not import stackless. What is the solution to this issue ?

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• C, Cygwin, and compiling drand and srand

  - by Kaytiana

  Hello, I have a C code which I am trying to compile in Cygwin and which contains both the drand() and srand() functions. I had Windows Vista with Cygwin installed and the code seemed to comile fine, but my computer broke and I had to get a new one. The new computer has Windows 7 64-bit version. I had a few issues downloading Cygwin but finally managed to do it by only selecting a few packages and then have been trying to get the rest that I need. The problem is I don't have the help I had installing it on my other computer so I don't know which packages I actually need, so I have just been guessing (all the gcc ones) but I mustn't have the one I need for srand and drand to work. If anyone could point me in the right direction, and also possibly just let me know which packages I need to compile C so I can check I have them all that would be great. Thanks a lot in advance for any help. Sorry, that was a lot of words! Kaytiana

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