Control: tags -1 + moreinfo Hi Fabian,
On Thu, 09 Oct 2025 17:58:55 +0200 Fabian Greffrath <[email protected]> wrote:
the /usr/share/cmake/debtoolchainfilegen tool comes handy to create a toolchain file for cross-building. However, when cross-building is involved, it is often a good idea to reset the build flags for the compilers and linkers - or at least reduce them to a subset that is known to work on the build architecture.That's what the *_FOR_BUILD flags are for.I'd suggest to include these flags in the toolchain file generated by debtoolchainfilegen, in the same form that they are emitted by dpkg-buildflags. Either always, or only if a parameter (say '-f') is additionally given to debtoolchainfilegen.Example: set(CMAKE_C_FLAGS "$ENV{CFLAGS_FOR_BUILD} $ENV{CPPFLAGS_FOR_BUILD}") set(CMAKE_EXE_LINKER_FLAGS "$ENV{LDFLAGS_FOR_BUILD}") Thanks for considering!
[Cc'ing Helmut because he wrote the debtoolchainfilegen tool and can probably fill in the blanks in my understanding]
AFAICT, the generated config is supposed to be used for the host compiler, so I'm not entirely sure I understand how the *_FOR_BUILD flags fit into the picture here. I am open to improvements for the cross-build use-case, though.
Cheers Timo -- ⢀⣴⠾⠻⢶⣦⠀ ╭────────────────────────────────────────────────────╮ ⣾⠁⢠⠒⠀⣿⡁ │ Timo Röhling │ ⢿⡄⠘⠷⠚⠋⠀ │ 9B03 EBB9 8300 DF97 C2B1 23BF CC8C 6BDD 1403 F4CA │ ⠈⠳⣄⠀⠀⠀⠀ ╰────────────────────────────────────────────────────╯
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