| --- make.conf.example |
| +++ make.conf.example |
| @@ -22,6 +22,15 @@ |
| # Example: |
| #USE="X gtk gnome -alsa" |
| |
| +# Host Setting |
| +# =========== |
| +# |
| +# All RV64 systems should use this host setting: |
| +CHOST="riscv64-unknown-linux-gnu" |
| + |
| +# whereas all RV32 ones should use: |
| +#CHOST="riscv32-unknown-linux-gnu" |
| + |
| # Host and optimization settings |
| # ============================== |
| # |
| @@ -39,9 +48,31 @@ |
| # -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. |
| +# -mcpu=<cpu-type> tells the compiler to take full advantage of the ABI and |
| +# instructions available on a certain CPU. This will produce code which may |
| +# not run on other RISC-V CPUs, even if they support the same ISA. |
| +# |
| +# -mtune=<cpu-type-or-series> results in code optimised for a specific CPU |
| +# (e.g. SiFive U74) or family (e.g. the SiFive 7 series) without breaking |
| +# compatibility with other RISC-V CPUs supporting the same ISA. |
| +# |
| +# -march=<isa-string> specifies the exact ISA for which to generate code. |
| +# This is normally not needed if you set -mcpu but might be useful for CPUs |
| +# not explicitly supported by gcc yet. Should that be the case and you aren't |
| +# sure what ISA string to use, the output of /proc/cpuinfo might give you a hint. |
| +# |
| +# -mabi=<abi-string> specifies the integer and floating-point calling convention |
| +# to use. Again, this is normally not needed if you set -mcpu. Care should be |
| +# taken while setting both -march and -mabi, as some calling conventions are |
| +# impossible to implement on some ISAs. |
| +# |
| +# Please refer to the section "RISC-V Options" of the GCC manual for a list |
| +# of possible ABI, architecture, CPU and feature values. |
| +# |
| +# Decent examples: |
| # |
| -#CFLAGS="-O2 -pipe" |
| +#CFLAGS="-mcpu=sifive-u74 -O2 -pipe" |
| +#CFLAGS="-mtune=sifive-7-series -O2 -pipe" |
| # |
| # If you set a CFLAGS above, then this line will set your default C++ flags to |
| # the same settings. |
| @@ -76,7 +107,7 @@ |
| # 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" |
| +#ACCEPT_KEYWORDS="~riscv" |
| |
| # ACCEPT_LICENSE is used to mask packages based on licensing restrictions. |
| # It may contain both license and group names, where group names are |