-march=native is not supported on all architectures

[Tachi107]

Hi, the meson.build files currently add -march=native when the compiler is detected as GCC or Clang; unfortunately, the flag isn't available on all GCC's supported targets, so compilation currently fails on Debian's ia64, mipsel, powerpc, ppc64, ppc64el, riscv64 and sparc64 architectures; you can find the build logs at https://buildd.debian.org/status/logs.php?pkg=tomlplusplus&ver=3.2.0%2Bds-2

tomlplusplus/meson.build

Lines 62 to 64 in 698285d

	if is_gcc or is_clang
	devel_args += '-march=native'
	endif

I can think of two possible solutions:

1. Remove the is_gcc or is_clang check, and instead write devel_args += compiler.get_supported_arguments('-march=native') (see the docs). This could be done for pretty much all the added compiler flags by the way.
2. Remove -march=native altogether

PS: yes, I don't know if I've mentioned this before but tomlplusplus is now packaged by Debian :)

[marzer]

Yeah I recently learned about get_supported_arguments, and have been meaning to go back and re-write this repo's build scripts to use it (and other things I've learned).

[Tachi107]

Okay, I'm going to patch this in the Debian package waiting for this rewrite, since this only affects exotic architectures. As always, feel free to ping me if you need help! (I'll try to reply in less than two months this time :p)

Feel free to close this whenever you prefer :)

[marzer]

Just finished the re-write, everything should be much simpler and less hacky (i.e. things that are supposed to be handled at the CI level are now handled there, lol). You may want to give it a look to verify I haven't broken various things, though.

[Tachi107]

Il giorno dom 22 gen 2023 alle 11:53:34 -08:00:00, Mark Gillard ***@***.***> ha scritto:

Closed #185 as completed via cb1d6d7.

That surely is a rewrite! Had a brief look, and it looks good. Just some notes: - Wrapping defines like '-DTOML_HEADER_ONLY=0' in cpp.get_supported_arguments() might be overkill, as virtually all compilers support the -D notation (MSVC too if I recall correctly). It also technically slows down the configure step, as Meson has to perform an additional check. - Using files() when passing relative filenames to library() isn't needed, as e.g. 'toml.cpp' will get immediately consumed by library(). files() is useful when passing file names around in variables/arrays, e.g. when you add 'toml.cpp' to the array the include/ subdirectory and want to reference it in the src/ subdirectory. But as you can see, these are almost useless nitpicks. Good job, and thank you!

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