| --- make.conf.example |
| +++ make.conf.example |
| @@ -22,6 +22,13 @@ |
| # Example: |
| #USE="X gtk gnome -alsa" |
| |
| +# Host Setting |
| +# ============ |
| +# |
| +# All PowerPC64 systems should use this host setting: |
| + |
| +CHOST="powerpc64-unknown-linux-gnu" |
| + |
| # Host and optimization settings |
| # ============================== |
| # |
| @@ -39,9 +46,38 @@ |
| # -frecord-gcc-switches, since otherwise the check could result in false |
| # positive results. |
| # |
| -# Please refer to the GCC manual for a list of possible values. |
| +# -mtune=<cpu-type> for PowerPC64 systems instructs the gcc compiler that |
| +# it can use instruction scheduling specific for that type of processor |
| +# specified |
| +# |
| +# -mcpu=<cpu-type> for PowerPC64 systems selects the type of processor you want |
| +# to optimize your code for. Code generated under those options will run best |
| +# on that processor. |
| +# |
| +# -mcpu=<cpu-type> and -mtune=<cpu-type> should both be specified |
| +# |
| +# GCC 3.x supports many ppc64 processor types including: power3, power4, |
| +# 970 (aka G5), and power5. |
| +# |
| +# RS64 processors should specify power3. |
| # |
| -#CFLAGS="-O2 -pipe" |
| +# Additional options of interest: |
| +# |
| +# -maltivec enables optional altivec support and should be used |
| +# only for 970 processors. It also requires that you have |
| +# the alitvec option compiled into your kernel to take full advantage of this |
| +# feature. Note: you should also include -mabi=altivec flag if using this option. |
| +# |
| +# -O3 for the most part seems ok but should be used with caution as |
| +# for instance app-editors/vim has problems if it is used. -O2 is a |
| +# good selection. |
| +# |
| +#Example CFLAGS setting |
| +#CFLAGS="-O2 -pipe -mcpu=970 -mtune=970 -maltivec -mabi=altivec" |
| +# |
| +#or |
| +# |
| +#CFLAGS="-O2 -pipe -mcpu=power3 -mtune=power3" |
| # |
| # If you set a CFLAGS above, then this line will set your default C++ flags to |
| # the same settings. |
| @@ -76,7 +112,10 @@ |
| # DO NOT PUT ANYTHING BUT YOUR SPECIFIC ~ARCHITECTURE IN THE LIST. |
| # IF YOU ARE UNSURE OF YOUR ARCH, OR THE IMPLICATIONS, DO NOT MODIFY THIS. |
| # |
| -#ACCEPT_KEYWORDS="~arch" |
| +# Note: this really shouldn't be enabled until _AFTER_ you bootstrap and emerge |
| +# system. If you want the testing things update after these steps are completed. |
| +# |
| +#ACCEPT_KEYWORDS="ppc64" |
| |
| # ACCEPT_LICENSE is used to mask packages based on licensing restrictions. |
| # It may contain both license and group names, where group names are |
