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* [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process
@ 2020-10-12  1:11 Elliott Mitchell
  2020-10-13 13:26 ` Wei Liu
  2020-10-15  1:01 ` Marek Marczykowski-Górecki
  0 siblings, 2 replies; 6+ messages in thread
From: Elliott Mitchell @ 2020-10-12  1:11 UTC (permalink / raw)
  To: xen-devel
  Cc: Ian Jackson, Wei Liu, Marek =?unknown-8bit?Q?Marczykowski-G=C3=B3recki?=

Unexpectedly the environment variable which needs to be passed is
$LDSHARED and not $LD.  Otherwise Python may find the build `ld` instead
of the host `ld`.

Replace $(LDFLAGS) with $(SHLIB_LDFLAGS) as Python needs shared objects
it can load at runtime, not executables.

This uses $(CC) instead of $(LD) since Python distutils appends $CFLAGS
to $LDFLAGS which breaks many linkers.

Signed-off-by: Elliott Mitchell <ehem+xen@m5p.com>
---
This is now the *third* time this has been sent to the list.  Mark Pryor
has tested and confirms Python cross-building is working.  There is one
wart left which I'm unsure of the best approach for.

Having looked around a bit, I believe this is a Python 2/3 compatibility
issue.  "distutils" for Python 2 likely lacked a separate $LDSHARED or
$LD variable, whereas Python 3 does have this.  Alas this is pointless
due to the above (unless you can cause distutils.py to do the final link
step separately).
---
 tools/pygrub/Makefile | 9 +++++----
 tools/python/Makefile | 9 +++++----
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/tools/pygrub/Makefile b/tools/pygrub/Makefile
index 3063c4998f..37b2146214 100644
--- a/tools/pygrub/Makefile
+++ b/tools/pygrub/Makefile
@@ -3,20 +3,21 @@ XEN_ROOT = $(CURDIR)/../..
 include $(XEN_ROOT)/tools/Rules.mk
 
 PY_CFLAGS = $(CFLAGS) $(PY_NOOPT_CFLAGS)
-PY_LDFLAGS = $(LDFLAGS) $(APPEND_LDFLAGS)
+PY_LDFLAGS = $(SHLIB_LDFLAGS) $(APPEND_LDFLAGS)
 INSTALL_LOG = build/installed_files.txt
 
 .PHONY: all
 all: build
 .PHONY: build
 build:
-	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
+	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
 
 .PHONY: install
 install: all
 	$(INSTALL_DIR) $(DESTDIR)/$(bindir)
-	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) \
-		setup.py install --record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
+	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" \
+		LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py install \
+		--record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
 		 --root="$(DESTDIR)" --install-scripts=$(LIBEXEC_BIN) --force
 	set -e; if [ $(bindir) != $(LIBEXEC_BIN) -a \
 	             "`readlink -f $(DESTDIR)/$(bindir)`" != \
diff --git a/tools/python/Makefile b/tools/python/Makefile
index 8d22c03676..b675f5b4de 100644
--- a/tools/python/Makefile
+++ b/tools/python/Makefile
@@ -5,19 +5,20 @@ include $(XEN_ROOT)/tools/Rules.mk
 all: build
 
 PY_CFLAGS = $(CFLAGS) $(PY_NOOPT_CFLAGS)
-PY_LDFLAGS = $(LDFLAGS) $(APPEND_LDFLAGS)
+PY_LDFLAGS = $(SHLIB_LDFLAGS) $(APPEND_LDFLAGS)
 INSTALL_LOG = build/installed_files.txt
 
 .PHONY: build
 build:
-	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" $(PYTHON) setup.py build
+	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
 
 .PHONY: install
 install:
 	$(INSTALL_DIR) $(DESTDIR)$(LIBEXEC_BIN)
 
-	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) \
-		setup.py install --record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
+	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" \
+		LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py install \
+		--record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
 		--root="$(DESTDIR)" --force
 
 	$(INSTALL_PYTHON_PROG) scripts/convert-legacy-stream $(DESTDIR)$(LIBEXEC_BIN)
-- 
2.20.1


-- 
(\___(\___(\______          --=> 8-) EHM <=--          ______/)___/)___/)
 \BS (    |         ehem+sigmsg@m5p.com  PGP 87145445         |    )   /
  \_CS\   |  _____  -O #include <stddisclaimer.h> O-   _____  |   /  _/
8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445




^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process
  2020-10-12  1:11 [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process Elliott Mitchell
@ 2020-10-13 13:26 ` Wei Liu
  2020-10-15  1:02   ` Marek Marczykowski-Górecki
  2020-10-15  1:01 ` Marek Marczykowski-Górecki
  1 sibling, 1 reply; 6+ messages in thread
From: Wei Liu @ 2020-10-13 13:26 UTC (permalink / raw)
  To: Elliott Mitchell
  Cc: xen-devel, Ian Jackson, Wei Liu, Marek Marczykowski-Górecki

On Sun, Oct 11, 2020 at 06:11:39PM -0700, Elliott Mitchell wrote:
> Unexpectedly the environment variable which needs to be passed is
> $LDSHARED and not $LD.  Otherwise Python may find the build `ld` instead
> of the host `ld`.
> 
> Replace $(LDFLAGS) with $(SHLIB_LDFLAGS) as Python needs shared objects
> it can load at runtime, not executables.
> 
> This uses $(CC) instead of $(LD) since Python distutils appends $CFLAGS
> to $LDFLAGS which breaks many linkers.
> 
> Signed-off-by: Elliott Mitchell <ehem+xen@m5p.com>
> ---
> This is now the *third* time this has been sent to the list.  Mark Pryor
> has tested and confirms Python cross-building is working.  There is one
> wart left which I'm unsure of the best approach for.
> 
> Having looked around a bit, I believe this is a Python 2/3 compatibility
> issue.  "distutils" for Python 2 likely lacked a separate $LDSHARED or
> $LD variable, whereas Python 3 does have this.  Alas this is pointless
> due to the above (unless you can cause distutils.py to do the final link
> step separately).

I think this is well-reasoned but I don't have time to figure out and
verify the details.

Marek, do you have any comment on this?

> ---
>  tools/pygrub/Makefile | 9 +++++----
>  tools/python/Makefile | 9 +++++----
>  2 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/pygrub/Makefile b/tools/pygrub/Makefile
> index 3063c4998f..37b2146214 100644
> --- a/tools/pygrub/Makefile
> +++ b/tools/pygrub/Makefile
> @@ -3,20 +3,21 @@ XEN_ROOT = $(CURDIR)/../..
>  include $(XEN_ROOT)/tools/Rules.mk
>  
>  PY_CFLAGS = $(CFLAGS) $(PY_NOOPT_CFLAGS)
> -PY_LDFLAGS = $(LDFLAGS) $(APPEND_LDFLAGS)
> +PY_LDFLAGS = $(SHLIB_LDFLAGS) $(APPEND_LDFLAGS)
>  INSTALL_LOG = build/installed_files.txt
>  
>  .PHONY: all
>  all: build
>  .PHONY: build
>  build:
> -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
> +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
>  
>  .PHONY: install
>  install: all
>  	$(INSTALL_DIR) $(DESTDIR)/$(bindir)
> -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) \
> -		setup.py install --record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
> +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" \
> +		LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py install \
> +		--record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
>  		 --root="$(DESTDIR)" --install-scripts=$(LIBEXEC_BIN) --force
>  	set -e; if [ $(bindir) != $(LIBEXEC_BIN) -a \
>  	             "`readlink -f $(DESTDIR)/$(bindir)`" != \
> diff --git a/tools/python/Makefile b/tools/python/Makefile
> index 8d22c03676..b675f5b4de 100644
> --- a/tools/python/Makefile
> +++ b/tools/python/Makefile
> @@ -5,19 +5,20 @@ include $(XEN_ROOT)/tools/Rules.mk
>  all: build
>  
>  PY_CFLAGS = $(CFLAGS) $(PY_NOOPT_CFLAGS)
> -PY_LDFLAGS = $(LDFLAGS) $(APPEND_LDFLAGS)
> +PY_LDFLAGS = $(SHLIB_LDFLAGS) $(APPEND_LDFLAGS)
>  INSTALL_LOG = build/installed_files.txt
>  
>  .PHONY: build
>  build:
> -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" $(PYTHON) setup.py build
> +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
>  
>  .PHONY: install
>  install:
>  	$(INSTALL_DIR) $(DESTDIR)$(LIBEXEC_BIN)
>  
> -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) \
> -		setup.py install --record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
> +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" \
> +		LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py install \
> +		--record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
>  		--root="$(DESTDIR)" --force
>  
>  	$(INSTALL_PYTHON_PROG) scripts/convert-legacy-stream $(DESTDIR)$(LIBEXEC_BIN)
> -- 
> 2.20.1
> 
> 
> -- 
> (\___(\___(\______          --=> 8-) EHM <=--          ______/)___/)___/)
>  \BS (    |         ehem+sigmsg@m5p.com  PGP 87145445         |    )   /
>   \_CS\   |  _____  -O #include <stddisclaimer.h> O-   _____  |   /  _/
> 8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445
> 
> 


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process
  2020-10-12  1:11 [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process Elliott Mitchell
  2020-10-13 13:26 ` Wei Liu
@ 2020-10-15  1:01 ` Marek Marczykowski-Górecki
  2020-10-16 13:25   ` Wei Liu
  1 sibling, 1 reply; 6+ messages in thread
From: Marek Marczykowski-Górecki @ 2020-10-15  1:01 UTC (permalink / raw)
  To: Elliott Mitchell; +Cc: xen-devel, Ian Jackson, Wei Liu


[-- Attachment #1: Type: text/plain, Size: 3904 bytes --]

On Sun, Oct 11, 2020 at 06:11:39PM -0700, Elliott Mitchell wrote:
> Unexpectedly the environment variable which needs to be passed is
> $LDSHARED and not $LD.  Otherwise Python may find the build `ld` instead
> of the host `ld`.
> 
> Replace $(LDFLAGS) with $(SHLIB_LDFLAGS) as Python needs shared objects
> it can load at runtime, not executables.
> 
> This uses $(CC) instead of $(LD) since Python distutils appends $CFLAGS
> to $LDFLAGS which breaks many linkers.
> 
> Signed-off-by: Elliott Mitchell <ehem+xen@m5p.com>

Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

> ---
> This is now the *third* time this has been sent to the list.  Mark Pryor
> has tested and confirms Python cross-building is working.  There is one
> wart left which I'm unsure of the best approach for.
> 
> Having looked around a bit, I believe this is a Python 2/3 compatibility
> issue.  "distutils" for Python 2 likely lacked a separate $LDSHARED or
> $LD variable, whereas Python 3 does have this.  Alas this is pointless
> due to the above (unless you can cause distutils.py to do the final link
> step separately).
> ---
>  tools/pygrub/Makefile | 9 +++++----
>  tools/python/Makefile | 9 +++++----
>  2 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/pygrub/Makefile b/tools/pygrub/Makefile
> index 3063c4998f..37b2146214 100644
> --- a/tools/pygrub/Makefile
> +++ b/tools/pygrub/Makefile
> @@ -3,20 +3,21 @@ XEN_ROOT = $(CURDIR)/../..
>  include $(XEN_ROOT)/tools/Rules.mk
>  
>  PY_CFLAGS = $(CFLAGS) $(PY_NOOPT_CFLAGS)
> -PY_LDFLAGS = $(LDFLAGS) $(APPEND_LDFLAGS)
> +PY_LDFLAGS = $(SHLIB_LDFLAGS) $(APPEND_LDFLAGS)
>  INSTALL_LOG = build/installed_files.txt
>  
>  .PHONY: all
>  all: build
>  .PHONY: build
>  build:
> -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
> +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
>  
>  .PHONY: install
>  install: all
>  	$(INSTALL_DIR) $(DESTDIR)/$(bindir)
> -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) \
> -		setup.py install --record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
> +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" \
> +		LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py install \
> +		--record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
>  		 --root="$(DESTDIR)" --install-scripts=$(LIBEXEC_BIN) --force
>  	set -e; if [ $(bindir) != $(LIBEXEC_BIN) -a \
>  	             "`readlink -f $(DESTDIR)/$(bindir)`" != \
> diff --git a/tools/python/Makefile b/tools/python/Makefile
> index 8d22c03676..b675f5b4de 100644
> --- a/tools/python/Makefile
> +++ b/tools/python/Makefile
> @@ -5,19 +5,20 @@ include $(XEN_ROOT)/tools/Rules.mk
>  all: build
>  
>  PY_CFLAGS = $(CFLAGS) $(PY_NOOPT_CFLAGS)
> -PY_LDFLAGS = $(LDFLAGS) $(APPEND_LDFLAGS)
> +PY_LDFLAGS = $(SHLIB_LDFLAGS) $(APPEND_LDFLAGS)
>  INSTALL_LOG = build/installed_files.txt
>  
>  .PHONY: build
>  build:
> -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" $(PYTHON) setup.py build
> +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
>  
>  .PHONY: install
>  install:
>  	$(INSTALL_DIR) $(DESTDIR)$(LIBEXEC_BIN)
>  
> -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) \
> -		setup.py install --record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
> +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" \
> +		LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py install \
> +		--record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
>  		--root="$(DESTDIR)" --force
>  
>  	$(INSTALL_PYTHON_PROG) scripts/convert-legacy-stream $(DESTDIR)$(LIBEXEC_BIN)

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

[-- Attachment #2: signature.asc --]
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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process
  2020-10-13 13:26 ` Wei Liu
@ 2020-10-15  1:02   ` Marek Marczykowski-Górecki
  2020-10-15  4:03     ` Elliott Mitchell
  0 siblings, 1 reply; 6+ messages in thread
From: Marek Marczykowski-Górecki @ 2020-10-15  1:02 UTC (permalink / raw)
  To: Wei Liu; +Cc: Elliott Mitchell, xen-devel, Ian Jackson


[-- Attachment #1: Type: text/plain, Size: 4666 bytes --]

On Tue, Oct 13, 2020 at 01:26:06PM +0000, Wei Liu wrote:
> On Sun, Oct 11, 2020 at 06:11:39PM -0700, Elliott Mitchell wrote:
> > Unexpectedly the environment variable which needs to be passed is
> > $LDSHARED and not $LD.  Otherwise Python may find the build `ld` instead
> > of the host `ld`.
> > 
> > Replace $(LDFLAGS) with $(SHLIB_LDFLAGS) as Python needs shared objects
> > it can load at runtime, not executables.
> > 
> > This uses $(CC) instead of $(LD) since Python distutils appends $CFLAGS
> > to $LDFLAGS which breaks many linkers.
> > 
> > Signed-off-by: Elliott Mitchell <ehem+xen@m5p.com>
> > ---
> > This is now the *third* time this has been sent to the list.  Mark Pryor
> > has tested and confirms Python cross-building is working.  There is one
> > wart left which I'm unsure of the best approach for.
> > 
> > Having looked around a bit, I believe this is a Python 2/3 compatibility
> > issue.  "distutils" for Python 2 likely lacked a separate $LDSHARED or
> > $LD variable, whereas Python 3 does have this.  Alas this is pointless
> > due to the above (unless you can cause distutils.py to do the final link
> > step separately).
> 
> I think this is well-reasoned but I don't have time to figure out and
> verify the details.

Yes, it looks like distutils in Python 2 was even more limited than
the one in Python 3.

> Marek, do you have any comment on this?
> 
> > ---
> >  tools/pygrub/Makefile | 9 +++++----
> >  tools/python/Makefile | 9 +++++----
> >  2 files changed, 10 insertions(+), 8 deletions(-)
> > 
> > diff --git a/tools/pygrub/Makefile b/tools/pygrub/Makefile
> > index 3063c4998f..37b2146214 100644
> > --- a/tools/pygrub/Makefile
> > +++ b/tools/pygrub/Makefile
> > @@ -3,20 +3,21 @@ XEN_ROOT = $(CURDIR)/../..
> >  include $(XEN_ROOT)/tools/Rules.mk
> >  
> >  PY_CFLAGS = $(CFLAGS) $(PY_NOOPT_CFLAGS)
> > -PY_LDFLAGS = $(LDFLAGS) $(APPEND_LDFLAGS)
> > +PY_LDFLAGS = $(SHLIB_LDFLAGS) $(APPEND_LDFLAGS)
> >  INSTALL_LOG = build/installed_files.txt
> >  
> >  .PHONY: all
> >  all: build
> >  .PHONY: build
> >  build:
> > -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
> > +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
> >  
> >  .PHONY: install
> >  install: all
> >  	$(INSTALL_DIR) $(DESTDIR)/$(bindir)
> > -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) \
> > -		setup.py install --record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
> > +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" \
> > +		LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py install \
> > +		--record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
> >  		 --root="$(DESTDIR)" --install-scripts=$(LIBEXEC_BIN) --force
> >  	set -e; if [ $(bindir) != $(LIBEXEC_BIN) -a \
> >  	             "`readlink -f $(DESTDIR)/$(bindir)`" != \
> > diff --git a/tools/python/Makefile b/tools/python/Makefile
> > index 8d22c03676..b675f5b4de 100644
> > --- a/tools/python/Makefile
> > +++ b/tools/python/Makefile
> > @@ -5,19 +5,20 @@ include $(XEN_ROOT)/tools/Rules.mk
> >  all: build
> >  
> >  PY_CFLAGS = $(CFLAGS) $(PY_NOOPT_CFLAGS)
> > -PY_LDFLAGS = $(LDFLAGS) $(APPEND_LDFLAGS)
> > +PY_LDFLAGS = $(SHLIB_LDFLAGS) $(APPEND_LDFLAGS)
> >  INSTALL_LOG = build/installed_files.txt
> >  
> >  .PHONY: build
> >  build:
> > -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" $(PYTHON) setup.py build
> > +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py build
> >  
> >  .PHONY: install
> >  install:
> >  	$(INSTALL_DIR) $(DESTDIR)$(LIBEXEC_BIN)
> >  
> > -	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) \
> > -		setup.py install --record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
> > +	CC="$(CC)" CFLAGS="$(PY_CFLAGS)" LDSHARED="$(CC)" \
> > +		LDFLAGS="$(PY_LDFLAGS)" $(PYTHON) setup.py install \
> > +		--record $(INSTALL_LOG) $(PYTHON_PREFIX_ARG) \
> >  		--root="$(DESTDIR)" --force
> >  
> >  	$(INSTALL_PYTHON_PROG) scripts/convert-legacy-stream $(DESTDIR)$(LIBEXEC_BIN)
> > -- 
> > 2.20.1
> > 
> > 
> > -- 
> > (\___(\___(\______          --=> 8-) EHM <=--          ______/)___/)___/)
> >  \BS (    |         ehem+sigmsg@m5p.com  PGP 87145445         |    )   /
> >   \_CS\   |  _____  -O #include <stddisclaimer.h> O-   _____  |   /  _/
> > 8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445
> > 
> > 

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process
  2020-10-15  1:02   ` Marek Marczykowski-Górecki
@ 2020-10-15  4:03     ` Elliott Mitchell
  0 siblings, 0 replies; 6+ messages in thread
From: Elliott Mitchell @ 2020-10-15  4:03 UTC (permalink / raw)
  To: Marek Marczykowski-G??recki; +Cc: Wei Liu, xen-devel, Ian Jackson

On Thu, Oct 15, 2020 at 03:02:59AM +0200, Marek Marczykowski-G??recki wrote:
> On Tue, Oct 13, 2020 at 01:26:06PM +0000, Wei Liu wrote:
> > On Sun, Oct 11, 2020 at 06:11:39PM -0700, Elliott Mitchell wrote:
> > > Having looked around a bit, I believe this is a Python 2/3 compatibility
> > > issue.  "distutils" for Python 2 likely lacked a separate $LDSHARED or
> > > $LD variable, whereas Python 3 does have this.  Alas this is pointless
> > > due to the above (unless you can cause distutils.py to do the final link
> > > step separately).
> > 
> > I think this is well-reasoned but I don't have time to figure out and
> > verify the details.
> 
> Yes, it looks like distutils in Python 2 was even more limited than
> the one in Python 3.

Actually feels like two steps forward, one step back.  Separate
$LDSHARED, yet $CFLAGS is appended to $LDFLAGS during invocation.

Architecture name is included the output Python extension filename, yet
the only way to override requires writing Python code.  I've got ideas
to workaround this, but they're rather gross.


-- 
(\___(\___(\______          --=> 8-) EHM <=--          ______/)___/)___/)
 \BS (    |         ehem+sigmsg@m5p.com  PGP 87145445         |    )   /
  \_CS\   |  _____  -O #include <stddisclaimer.h> O-   _____  |   /  _/
8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445




^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process
  2020-10-15  1:01 ` Marek Marczykowski-Górecki
@ 2020-10-16 13:25   ` Wei Liu
  0 siblings, 0 replies; 6+ messages in thread
From: Wei Liu @ 2020-10-16 13:25 UTC (permalink / raw)
  To: Marek Marczykowski-Górecki
  Cc: Elliott Mitchell, xen-devel, Ian Jackson, Wei Liu

On Thu, Oct 15, 2020 at 03:01:48AM +0200, Marek Marczykowski-Górecki wrote:
> On Sun, Oct 11, 2020 at 06:11:39PM -0700, Elliott Mitchell wrote:
> > Unexpectedly the environment variable which needs to be passed is
> > $LDSHARED and not $LD.  Otherwise Python may find the build `ld` instead
> > of the host `ld`.
> > 
> > Replace $(LDFLAGS) with $(SHLIB_LDFLAGS) as Python needs shared objects
> > it can load at runtime, not executables.
> > 
> > This uses $(CC) instead of $(LD) since Python distutils appends $CFLAGS
> > to $LDFLAGS which breaks many linkers.
> > 
> > Signed-off-by: Elliott Mitchell <ehem+xen@m5p.com>
> 
> Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

Thanks. Applied.

Wei.


^ permalink raw reply	[flat|nested] 6+ messages in thread

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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-12  1:11 [SECOND RESEND] [PATCH] tools/python: Pass linker to Python build process Elliott Mitchell
2020-10-13 13:26 ` Wei Liu
2020-10-15  1:02   ` Marek Marczykowski-Górecki
2020-10-15  4:03     ` Elliott Mitchell
2020-10-15  1:01 ` Marek Marczykowski-Górecki
2020-10-16 13:25   ` Wei Liu

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