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| author | Helge Deller <deller@kernel.org> | 2026-04-05 00:40:16 +0200 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2026-04-08 13:48:50 +0300 |
| commit | cf634dfcd8fc5dded8849d41e2eeaa189b06feb0 (patch) | |
| tree | 4657037297c09eb85c1c705713dc293dbb037b17 /meson.build | |
| parent | 276b060a743609bb41bc7ae3f6942e2bcc29a641 (diff) | |
| download | qemu-cf634dfcd8fc5dded8849d41e2eeaa189b06feb0.tar.gz qemu-cf634dfcd8fc5dded8849d41e2eeaa189b06feb0.zip | |
Allow building qemu tools on 32-bit hosts
Qemu's tools like qemu-img are often needed on 32-bit platforms,
although the actual qemu emulators have been discontinued on 32-bit.
To allow building the tools on 32-bit this patch implements three small
changes:
a) The check in meson.build is changed to still error out if the user
tries to build qemu-system or qemu-user on a 32-bit platform, but allows
building tools (e.g. by "--enable-tools") alone.
b) The compile time check in atomic.h now checks against
sizeof(uint64_t) so that 32-bit environments can still build
successfully, while 128-bit atomic operations are prevented to sneak in.
c) Allow linking against libatomic as long as we don't build the
qemu-system and qemu-user binaries.
Sucessfully tested on the 32-bit big-endian powerpc architecture.
Signed-off-by: Helge Deller <deller@gmx.de>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'meson.build')
| -rw-r--r-- | meson.build | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/meson.build b/meson.build index daa58e46a3..ab3e97eb9f 100644 --- a/meson.build +++ b/meson.build @@ -323,8 +323,8 @@ endif # Compiler flags # ################## -if cc.sizeof('void *') < 8 - error('QEMU requires a 64-bit CPU host architecture') +if (cc.sizeof('void *') < 8) and (have_system or have_user) + error('QEMU emulator requires a 64-bit CPU host architecture. Only tools may be built for 32-bit.') endif foreach lang : all_languages @@ -423,8 +423,16 @@ endif # # Later checks assume we won't get atomic ops for int128 without # explicitly asking for -latomic, so we must disable GCC's new -# automatic linking with the new -fno-link-libatomic flag -qemu_isa_flags += cc.get_supported_arguments('-fno-link-libatomic') +# automatic linking with the new -fno-link-libatomic flag. +# +# When not building the emulators, but qemu helper tools only +# (e.g. on 32-bit hosts), libatomic is sometimes required and +# thus acceptable. +if (have_system or have_user) + qemu_isa_flags += cc.get_supported_arguments('-fno-link-libatomic') +else + qemu_ldflags += cc.get_supported_link_arguments('-latomic') +endif qemu_common_flags = qemu_isa_flags + qemu_common_flags |