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Clang vs GCC - which produces faster binaries? [closed]
...velopers, and then when you push the code out into the world, Linux distro/BSD/etc. end-users will use GCC for the faster binaries.
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How to turn on (literally) ALL of GCC's warnings?
...
Gcc 4.3+ now has -Q --help=warnings, you can even specify --help=warnings,C to just print out the C related warnings.
I just wrote a m4 module to take advantage of this (also supports clang's -Weverything), see wget_manywarnings...
How to automatically generate a stacktrace when my program crashes
...ace:
/lib/libSegFault.so[0xb7f9e100]
??:0(??)[0xb7fa3400]
/usr/include/c++/4.3/bits/stl_queue.h:226(_ZNSt5queueISsSt5dequeISsSaISsEEE4pushERKSs)[0x805647a]
/home/dbingham/src/middle-earth-mud/alpha6/src/engine/player.cpp:73(_ZN6Player5inputESs)[0x805377c]
/home/dbingham/src/middle-earth-mud/alpha6/s...
How are msys, msys2, and msysgit related to each other?
...get, and to which MacOSX users are
used to from Homebrew or MacPorts, or BSD users from the Ports system,
to MSys2: a simple pacman -Syu will update all installed packages to
the newest versions currently available.
MSys2 is also very active, typically providing package updates
multiple...
How to modify a global variable within a function in bash?
... then let's implement an API for exactly this:
# This needs a modern bash 4.3 (see "help declare" if "-n" is present,
# we get rid of it below anyway).
: capture VARIABLE command args..
capture()
{
local -n output="$1"
shift
output="$("$@")"
}
Now, instead of writing
d1=$(d)
we can write
capt...
How to profile a bash shell script slow startup?
... follow in this...
Using script, scriptreplay and timing file
As part of BSD Utils, script (and scriptreplay) is a very old tool which can be used to profile bash, with a very small footprint.
script -t script.log 2>script.tim -c 'bash -x -c "
for ((i=3;i--;));do sleep .1;done
for ((i...
Pretty-print C++ STL containers
... which is available as part of C++0x, and works in Visual C++ 2010 and g++ 4.3 (needs the -std=c++0x flag) and later. This way there is no dependency on Boost.
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Cartesian product of x and y array points into single array of 2D points
...std. dev. of 7 runs, 10 loops each)
cartesian_product_transpose:
184 ms ± 4.32 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
cartesian_product_itertools:
3.69 s ± 73.5 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
In [7]: test_cartesian(*(x10 * 6))
cartesian_product:
26.5 ms ...
Unicode equivalents for \w and \b in Java regular expressions?
...ent wish to see that done (with some sort of open-source licence, probably BSD or ASL). I'm probably going to change the API from what it is in this alpha prototype, clean up the code, etc. But it helps us out tremendously, and we figure it will help others, too. I really wish Sun would do something...
How do I achieve the theoretical maximum of 4 FLOPs per cycle?
... Yes, thanks indeed it improves somewhat. I now get about 4.1-4.3 Gflops, or 1.55 flops per cycle. And no, in this example -O2 didn't loop unroll.
– user1059432
Dec 5 '11 at 18:37
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