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Diffstat (limited to 'cnf/make.conf.example.riscv.diff')
| -rw-r--r-- | cnf/make.conf.example.riscv.diff | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/cnf/make.conf.example.riscv.diff b/cnf/make.conf.example.riscv.diff new file mode 100644 index 000000000..df1e6a70d --- /dev/null +++ b/cnf/make.conf.example.riscv.diff @@ -0,0 +1,61 @@ +--- 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 |