* [Buildroot] [PATCH] package/luajit: fix luvi
@ 2021-11-08 20:10 Francois Perrad
2021-11-09 22:51 ` Romain Naour
0 siblings, 1 reply; 3+ messages in thread
From: Francois Perrad @ 2021-11-08 20:10 UTC (permalink / raw)
To: buildroot
luvi uses the cross bytecode generation of host-luajit
the bytecode format has 2 flavors, depending of GC64 option.
since the commit https://github.com/LuaJIT/LuaJIT/commit/bd00094c3b50e193fb32aad79b7ea8ea6b78ed25
GC64 mode is enable by default on all 64bits platform.
with this patch, luajit and host-luajit are built with the same option,
so the bytecode generated by host-luajit is valid on luajit.
Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
---
package/luajit/luajit.mk | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/package/luajit/luajit.mk b/package/luajit/luajit.mk
index fbbd8ebc7..ba5d85434 100644
--- a/package/luajit/luajit.mk
+++ b/package/luajit/luajit.mk
@@ -15,6 +15,7 @@ LUAJIT_PROVIDES = luainterpreter
ifeq ($(BR2_PACKAGE_LUAJIT_COMPAT52),y)
LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_LUA52COMPAT
+HOST_LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_LUA52COMPAT
endif
# The luajit build procedure requires the host compiler to have the
@@ -26,8 +27,10 @@ endif
# libraries are installed.
ifeq ($(BR2_ARCH_IS_64),y)
LUAJIT_HOST_CC = $(HOSTCC)
+HOST_LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_GC64
else
LUAJIT_HOST_CC = $(HOSTCC) -m32
+HOST_LUAJIT_XCFLAGS += -DLUAJIT_DISABLE_GC64
endif
# We unfortunately can't use TARGET_CONFIGURE_OPTS, because the luajit
@@ -66,7 +69,7 @@ LUAJIT_POST_INSTALL_TARGET_HOOKS += LUAJIT_INSTALL_SYMLINK
define HOST_LUAJIT_BUILD_CMDS
$(HOST_MAKE_ENV) $(MAKE) PREFIX="$(HOST_DIR)" BUILDMODE=dynamic \
TARGET_LDFLAGS="$(HOST_LDFLAGS)" \
- XCFLAGS=$(LUAJIT_XCFLAGS) \
+ XCFLAGS=$(HOST_LUAJIT_XCFLAGS) \
-C $(@D) amalg
endef
--
2.32.0
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^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Buildroot] [PATCH] package/luajit: fix luvi
2021-11-08 20:10 [Buildroot] [PATCH] package/luajit: fix luvi Francois Perrad
@ 2021-11-09 22:51 ` Romain Naour
2021-11-10 8:06 ` Yann E. MORIN
0 siblings, 1 reply; 3+ messages in thread
From: Romain Naour @ 2021-11-09 22:51 UTC (permalink / raw)
To: Francois Perrad, buildroot
Hello François,
Le 08/11/2021 à 21:10, Francois Perrad a écrit :
> luvi uses the cross bytecode generation of host-luajit
> the bytecode format has 2 flavors, depending of GC64 option.
>
> since the commit https://github.com/LuaJIT/LuaJIT/commit/bd00094c3b50e193fb32aad79b7ea8ea6b78ed25
> GC64 mode is enable by default on all 64bits platform.
>
> with this patch, luajit and host-luajit are built with the same option,
> so the bytecode generated by host-luajit is valid on luajit.
I believe it would be great to add a new test to test bytecode generated by
host-luajit. It's only by "chance" that we noticed this issue.
>
> Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
> ---
> package/luajit/luajit.mk | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/package/luajit/luajit.mk b/package/luajit/luajit.mk
> index fbbd8ebc7..ba5d85434 100644
> --- a/package/luajit/luajit.mk
> +++ b/package/luajit/luajit.mk
> @@ -15,6 +15,7 @@ LUAJIT_PROVIDES = luainterpreter
>
> ifeq ($(BR2_PACKAGE_LUAJIT_COMPAT52),y)
> LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_LUA52COMPAT
> +HOST_LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_LUA52COMPAT
> endif
>
> # The luajit build procedure requires the host compiler to have the
> @@ -26,8 +27,10 @@ endif
> # libraries are installed.
> ifeq ($(BR2_ARCH_IS_64),y)
> LUAJIT_HOST_CC = $(HOSTCC)
> +HOST_LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_GC64
What if the host is an 32bits machine ?
The luvi test needs another change since luvi -v doesn't always return a list in
the same order:
See LuaJIT FAQ:
https://luajit.org/faq.html
Q: Table iteration with pairs() does not result in the same order?
http://lists.busybox.net/pipermail/buildroot/2021-November/627938.html
Best regards,
Romain
> else
> LUAJIT_HOST_CC = $(HOSTCC) -m32
> +HOST_LUAJIT_XCFLAGS += -DLUAJIT_DISABLE_GC64
> endif
>
> # We unfortunately can't use TARGET_CONFIGURE_OPTS, because the luajit
> @@ -66,7 +69,7 @@ LUAJIT_POST_INSTALL_TARGET_HOOKS += LUAJIT_INSTALL_SYMLINK
> define HOST_LUAJIT_BUILD_CMDS
> $(HOST_MAKE_ENV) $(MAKE) PREFIX="$(HOST_DIR)" BUILDMODE=dynamic \
> TARGET_LDFLAGS="$(HOST_LDFLAGS)" \
> - XCFLAGS=$(LUAJIT_XCFLAGS) \
> + XCFLAGS=$(HOST_LUAJIT_XCFLAGS) \
> -C $(@D) amalg
> endef
>
>
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Buildroot] [PATCH] package/luajit: fix luvi
2021-11-09 22:51 ` Romain Naour
@ 2021-11-10 8:06 ` Yann E. MORIN
0 siblings, 0 replies; 3+ messages in thread
From: Yann E. MORIN @ 2021-11-10 8:06 UTC (permalink / raw)
To: Romain Naour; +Cc: buildroot, Francois Perrad
François, Romain, All,
Thanks for the cross-investigations! 👍
On 2021-11-09 23:51 +0100, Romain Naour spake thusly:
> Le 08/11/2021 à 21:10, Francois Perrad a écrit :
> > luvi uses the cross bytecode generation of host-luajit
> > the bytecode format has 2 flavors, depending of GC64 option.
> >
> > since the commit https://github.com/LuaJIT/LuaJIT/commit/bd00094c3b50e193fb32aad79b7ea8ea6b78ed25
> > GC64 mode is enable by default on all 64bits platform.
> >
> > with this patch, luajit and host-luajit are built with the same option,
> > so the bytecode generated by host-luajit is valid on luajit.
> I believe it would be great to add a new test to test bytecode generated by
> host-luajit. It's only by "chance" that we noticed this issue.
We already have a luajit test in:
support/testing/tests/package/test_lua.py
> > Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
> > ---
> > package/luajit/luajit.mk | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/package/luajit/luajit.mk b/package/luajit/luajit.mk
> > index fbbd8ebc7..ba5d85434 100644
> > --- a/package/luajit/luajit.mk
> > +++ b/package/luajit/luajit.mk
> > @@ -15,6 +15,7 @@ LUAJIT_PROVIDES = luainterpreter
> >
> > ifeq ($(BR2_PACKAGE_LUAJIT_COMPAT52),y)
> > LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_LUA52COMPAT
> > +HOST_LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_LUA52COMPAT
> > endif
> >
> > # The luajit build procedure requires the host compiler to have the
> > @@ -26,8 +27,10 @@ endif
> > # libraries are installed.
> > ifeq ($(BR2_ARCH_IS_64),y)
> > LUAJIT_HOST_CC = $(HOSTCC)
> > +HOST_LUAJIT_XCFLAGS += -DLUAJIT_ENABLE_GC64
>
> What if the host is an 32bits machine ?
From https://luajit.org/extensions.html#string_dump (and the same file
in git still has the same wording):
The generated bytecode is portable and can be loaded on any
architecture that LuaJIT supports, independent of word size
or endianess.
However, from https://luajit.org/install.html#cross
The GNU Makefile-based build system allows cross-compiling on any
host for any supported target, as long as both architectures have
the same pointer size.
In git, the file reads differently, but the requirement remains:
The GNU Makefile-based build system allows cross-compiling on any
host for any supported target:
* Yes, you need a toolchain for both your host and your target!
* Both host and target architectures must have the same pointer
size.
* E.g. if you want to cross-compile to a 32 bit target on a 64
bit host, you need to install the multilib development package
(e.g. libc6-dev-i386 on Debian/Ubuntu) and build a 32 bit host
part (HOST_CC="gcc -m32").
* 64 bit targets always require compilation on a 64 bit host.
Gah... So, on a 32-bit host, we can't build for a 64-bit target, while
the opposite will require BR2_HOSTARCH_NEEDS_IA32_LIBS.
Meh, meh, meh...
> The luvi test needs another change since luvi -v doesn't always return a list in
> the same order:
> See LuaJIT FAQ:
> https://luajit.org/faq.html
> Q: Table iteration with pairs() does not result in the same order?
> http://lists.busybox.net/pipermail/buildroot/2021-November/627938.html
Yes, but this is a separate topic, which can be addressed in parallel.
Regards,
Yann E. MORIN.
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2021-11-08 20:10 [Buildroot] [PATCH] package/luajit: fix luvi Francois Perrad
2021-11-09 22:51 ` Romain Naour
2021-11-10 8:06 ` Yann E. MORIN
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