Home > General > Today’s GCC 4.6.2 compiler flags will be…

Today’s GCC 4.6.2 compiler flags will be…

-m32 -g0 -Os -flto=4 -fwhole-program -fuse-linker-plugin -march=native -mmmx -msse -mfpmath=sse -mcx16 -mssse3 -msse4.1 -msse2 -std=c++11 -Wall -Wshadow -Wno-deprecated -Winvalid-pch -Wno-array-bounds -Werror -Wno-strict-aliasing -Wno-unused-result -fno-stack-protector -ftracer -pthread

Interested to see if -Os has any noticeable improvement over -O3.

make -j33 or  — if I’m feeling frisky —  make -j.

cpuinfo shows 8 of these (it’s a dual four-core box)

~/pn/WW2/src$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5420 @ 2.50GHz
stepping : 10
cpu MHz : 600.000
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 xsave lahf_lm dts tpr_shadow vnmi flexpriority
bogomips : 5000.00
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
Categories: General
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