C++0x feature support in GCC 4.5

Here is a description of some nice new features available in C++0x supported by GCC 4.5.

http://www.ibm.com/developerworks/aix/library/au-gcc/index.html?cmp=dw&cpb=dwaix&ct=dwnew&cr=dwnen&ccy=zz&csr=030311

Here are some highlights.

Static assertions:

static_assert(sizeof(int) == 4, "Integer sizes expected to be 4");

New character types

char16_t guaranteed to be able to hold a UTF-16 character
char32_t guaranteed to be able to hold a UTF-32 character

Auto syntax type

auto *num1 = new int(7); // type for num1 it int*
const auto num2 = 3.1415; // type for num2 is double


Initializer lists

// in a variable definition
std::vector doubles = {2.3, 4.511, 1.23, 0.99};

// Initializer list used with new
std::list *d2 = new std::list {1.2, 1.3};

// Initialize a map
std::map = { {“key1”, 1}, {“key2”, 2} };

Flash on 64 bit Fedora 14

Download: http://download.macromedia.com/pub/labs/flashplayer10/flashplayer10_2_p3_64bit_linux_111710.tar.gz

# tar xzf flashplayer10_2_p3_64bit_linux_111710.tar.gz
# cp libflashplayer.so ~/.mozilla/plugins

Thanks to the Fedora forums:
http://forums.fedoraforum.org/archive/index.php/t-256318.html

If tail -f file gives "too many open files"

If tail -f file gives "too many open files" then add this to your /etc/sysctl.conf

fs.inotify.max_user_watches=16384

Or interactively:

# sysctl -w fs.inotify.max_user_watches=16384

Setup grub as the boot loader in your MBR

# Boot from CD and choose linux rescue which will mount the system.
# Write to the MBR. Assuming grub.conf is intact, continue with the process. Type "grub" (return) to enter the grub shell.

Tell grub where to find the requisite files. If you know where they are, enter something like:

root (hd0,1)

(hd0,1) means primary controller master, second partition. If you DON'T know where they are, type:

find /boot/grub/stage1

setup (hd0)

This command will install grub on the MBR of the first drive.

# Type quit and reboot. Everything should proceed normally.

In our case, the details were all identical except that we used (hd0,0) in place of (hd0,1) because our /boot was on the first partition of the first drive.

How to put real java on your Linux machine

Fedora Systems

This set of commands will get rid of the stupid gcj java that is packaged with Fedora and other Linux distros and replace it with the real java from Oracle.

alternatives --config java
alternatives --remove java /usr/lib/jvm/jre-1.4.2-gcj/bin/java
alternatives --install /usr/bin/java java /usr/java/latest/bin/java 1
alternatives --config javac
alternatives --remove javac /usr/lib/jvm/java-1.4.2-gcj/bin/javac
alternatives --install /usr/bin/javac javac /usr/java/latest/bin/javac 1

Ubuntu

update-java-alternatives -l
update-java-alternatives -s java-6-sun

Building an RPM on Fedora 12 for an older system

If you are building an RPM on a Fedora 12 system (or later) and you want that RPM to be installed on a system with an older version of rpm, such as an older Fedora or Centos, define these values in your ~/.rpmmacros.

%_binary_filedigest_algorithm 1
%_source_filedigest_algorithm 1
%_binary_payload w9.gzdio

This sets the hash algorithm and the payload compression used by RPM to be compatible with older versions of rpm. This avoids the following errors:

error: Failed dependencies:
rpmlib(FileDigests) <= 4.6.0-1 is needed by x
rpmlib(PayloadIsXz) <= 5.2-1 is needed by x

Linux drivers for a Dell 1235CN printer - kudos to Samsung

I purchased a Dell 1235CN laser multi-function printer, which arrived today. Unfortunately Fedora 12 doesn't know about the printer, so this lead me to the inevitable search for the right drivers.

I found a post by someone who had the same problem. She/he had called Dell support who told her/him that Dell did not support Linux for that printer, but that the printer is actually a rebadged Samsung CLX-3175 printer.

I visited the Samsung web site and was really happy to see that Samsung to a great job of supporting their printers on Windows, Mac and Linux. I was able to download a Linux tarball that contained the necessary drivers wrapped up in an easy to use installer.

http://www.samsung.com/au/consumer/print-solutions/print-multifunctions-copiers/colour-multifunction/CLX-3175FN/XSA/index.idx?pagetype=prd_detail&tab=support

After installing the tarball my printer was working.

Thanks to the people at Samsung! Excellent work for your top class Linux support.