Feature Request: dump out --with-arch options the compiler was built with

[MarcKarasek]

option for gcc to printout what arch extensions it was built with.

for example built with --with-arch=rv64imafdc some option to dump rv64imafdc to console.

Something like --arch

[jim-wilson]

gcc -v will show the configure options, including the --with-arch and --with-abi if any.

touch tmp.c; gcc -v tmp.c will show default options passed to cc1 and as which will show the default arch and abi options.

touch tmp.c; gcc -E -dM | grep __riscv will show the default predefined RISC-V macros. This doesn't give arch directly, but will give xlen and all extensions. It also give the abi by combining xlen and the float abi.

If you have an embedded elf compiler, then "touch tmp.c; gcc -S tmp.c; grep arch tmp.s" will give arch.

touch tmp.c; gcc -c tm-.c; readelf -h tmp.o will give float ABI. You can get xlen from whether this is ELF32 or ELF64. That gives you ABI.

[MarcKarasek]

thanks for the info.. -v option is not very well documented in the--help It says : Display the programs invoked by the compiler. Marc

…

On Mon, Nov 16, 2020 at 11:01 AM Jim Wilson ***@***.***> wrote: gcc -v will show the configure options, including the --with-arch and --with-abi if any. touch tmp.c; gcc -v tmp.c will show default options passed to cc1 and as which will show the default arch and abi options. touch tmp.c; gcc -E -dM | grep __riscv will show the default predefined RISC-V macros. This doesn't give arch directly, but will give xlen and all extensions. It also give the abi by combining xlen and the float abi. If you have an embedded elf compiler, then "touch tmp.c; gcc -S tmp.c; grep arch tmp.s" will give arch. touch tmp.c; gcc -c tm-.c; readelf -h tmp.o will give float ABI. You can get xlen from whether this is ELF32 or ELF64. That gives you ABI. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#775 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AD72ZM4V26435OJNDUMXXELSQFED7ANCNFSM4TXKQNBQ> .

-- /**************** Marc Karasek ASM T648 Herder of Cats ****************/

[TommyMurphyTM1234]

Duplicate issue?

#1101

[TommyMurphyTM1234]

-dumpspecs also shows the default arch/abi:

./riscv32-unknown-linux-gnu-gcc -dumpspecs 
...
*multilib_defaults:
march=rv32imafdc mabi=ilp32d
...

On this basis I'm closing this issue.