The docs say we take ISA strings, but that's never really been the case: at a bare minimum we've required lower case strings, but there's generally been some subtle differences as well in things like version handling and such. We talked about removing the lower case requirement in the last GNU toolchain meeting and we've always called other differences just bugs. We don't have profile support yet, but based on the discussions on the RISC-V lists it looks like we're going to have some differences there as well.
So let's just stop pretending these are ISA strings. That's been a headache for years now, if we're meant to just be ISA-string-like here then we don't have to worry about all these long-tail ISA string parsing issues. Link: https://lists.riscv.org/g/sig-toolchains/message/486 gcc/ChangeLog doc/invoke.texi (RISC-V): -march doesn't take ISA strings. --- This is now woefully under-documented, as we can't even fall back on the "it's just an ISA string" excuse any more. I'm happy to go document that, but figured I'd just send this along now so we can have the discussion. --- gcc/doc/invoke.texi | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 94a2e20cfc1..780b0364c52 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -28617,11 +28617,11 @@ Produce code conforming to version 20191213. The default is @option{-misa-spec=20191213} unless GCC has been configured with @option{--with-isa-spec=} specifying a different default version. -@item -march=@var{ISA-string} +@item -march=@var{target-string} @opindex march -Generate code for given RISC-V ISA (e.g.@: @samp{rv64im}). ISA strings must be -lower-case. Examples include @samp{rv64i}, @samp{rv32g}, @samp{rv32e}, and -@samp{rv32imaf}. +Generate code for given target (e.g.@: @samp{rv64im}). Target strings are +similar to ISA strings, but must be lower-case. Examples include @samp{rv64i}, +@samp{rv32g}, @samp{rv32e}, and @samp{rv32imaf}. When @option{-march=} is not specified, use the setting from @option{-mcpu}. -- 2.38.1
