[ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Clemens Gruber]

Hi,

the used host-xz version was not available anymore, I therefore updated
it and in the process, decided to update some of the other host
libraries as well.

In the next patch following these host tool version bumps, I made a
first attempt to move to current stable gcc, glibc, binutils and gdb.
(Just as a starting point, marked RFC)

Thanks,
Clemens

Clemens Gruber (6):
  host-gmp: bump version to 6.1.0
  host-isl: bump version to 0.14.1
  host-libelf: bump version to 0.164
  host-mpc: bump version to 1.0.3
  host-mpfr: bump version to 3.1.3
  host-xz: bump version to 5.2.2

 ....guess-disable-build-tests-to-use-generic.patch | 22 ----------------------
 patches/gmp-6.0.0a/series                          |  4 ----
 ....guess-disable-build-tests-to-use-generic.patch | 22 ++++++++++++++++++++++
 patches/gmp-6.1.0/series                           |  4 ++++
 rules/host-gmp.make                                |  4 ++--
 rules/host-isl.make                                |  4 ++--
 rules/host-libelf.make                             |  4 ++--
 rules/host-mpc.make                                |  4 ++--
 rules/host-mpfr.make                               |  4 ++--
 rules/host-xz.make                                 |  4 ++--
 10 files changed, 38 insertions(+), 38 deletions(-)
 delete mode 100644 patches/gmp-6.0.0a/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
 delete mode 100644 patches/gmp-6.0.0a/series
 create mode 100644 patches/gmp-6.1.0/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
 create mode 100644 patches/gmp-6.1.0/series

-- 
2.6.4


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[ptxdist] [PATCH 1/6] host-gmp: bump version to 6.1.0

[Clemens Gruber]

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 ....guess-disable-build-tests-to-use-generic.patch | 22 ----------------------
 patches/gmp-6.0.0a/series                          |  4 ----
 ....guess-disable-build-tests-to-use-generic.patch | 22 ++++++++++++++++++++++
 patches/gmp-6.1.0/series                           |  4 ++++
 rules/host-gmp.make                                |  4 ++--
 5 files changed, 28 insertions(+), 28 deletions(-)
 delete mode 100644 patches/gmp-6.0.0a/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
 delete mode 100644 patches/gmp-6.0.0a/series
 create mode 100644 patches/gmp-6.1.0/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
 create mode 100644 patches/gmp-6.1.0/series

diff --git a/patches/gmp-6.0.0a/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch b/patches/gmp-6.0.0a/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
deleted file mode 100644
index 193a32d..0000000
--- a/patches/gmp-6.0.0a/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
+++ /dev/null
@@ -1,22 +0,0 @@
-From: Michael Olbrich <m.olbrich@pengutronix.de>
-Date: Tue, 2 Jun 2015 11:28:32 +0200
-Subject: [PATCH] HACK: config.guess: disable build tests to use generic CPU
- type
-
-Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
----
- config.guess | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/config.guess b/config.guess
-index 02b61f45aaf8..6d004f688aef 100755
---- a/config.guess
-+++ b/config.guess
-@@ -2,6 +2,7 @@
- #
- # GMP config.guess wrapper.
- 
-+CC_FOR_BUILD=no_compiler_found
- 
- # Copyright 2000-2006, 2008, 2011-2014 Free Software Foundation, Inc.
- #
diff --git a/patches/gmp-6.0.0a/series b/patches/gmp-6.0.0a/series
deleted file mode 100644
index 44e7026..0000000
--- a/patches/gmp-6.0.0a/series
+++ /dev/null
@@ -1,4 +0,0 @@
-# generated by git-ptx-patches
-#tag:base --start-number 1
-0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
-# 642de0c224f96536babfe1f65f6fd5fb  - git-ptx-patches magic
diff --git a/patches/gmp-6.1.0/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch b/patches/gmp-6.1.0/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
new file mode 100644
index 0000000..193a32d
--- /dev/null
+++ b/patches/gmp-6.1.0/0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
@@ -0,0 +1,22 @@
+From: Michael Olbrich <m.olbrich@pengutronix.de>
+Date: Tue, 2 Jun 2015 11:28:32 +0200
+Subject: [PATCH] HACK: config.guess: disable build tests to use generic CPU
+ type
+
+Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
+---
+ config.guess | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/config.guess b/config.guess
+index 02b61f45aaf8..6d004f688aef 100755
+--- a/config.guess
++++ b/config.guess
+@@ -2,6 +2,7 @@
+ #
+ # GMP config.guess wrapper.
+ 
++CC_FOR_BUILD=no_compiler_found
+ 
+ # Copyright 2000-2006, 2008, 2011-2014 Free Software Foundation, Inc.
+ #
diff --git a/patches/gmp-6.1.0/series b/patches/gmp-6.1.0/series
new file mode 100644
index 0000000..44e7026
--- /dev/null
+++ b/patches/gmp-6.1.0/series
@@ -0,0 +1,4 @@
+# generated by git-ptx-patches
+#tag:base --start-number 1
+0001-HACK-config.guess-disable-build-tests-to-use-generic.patch
+# 642de0c224f96536babfe1f65f6fd5fb  - git-ptx-patches magic
diff --git a/rules/host-gmp.make b/rules/host-gmp.make
index 91b43e8..70947aa 100644
--- a/rules/host-gmp.make
+++ b/rules/host-gmp.make
@@ -16,8 +16,8 @@ HOST_PACKAGES-$(PTXCONF_HOST_GMP) += host-gmp
 #
 # Paths and names
 #
-HOST_GMP_VERSION	:= 6.0.0a
-HOST_GMP_MD5		:= 1e6da4e434553d2811437aa42c7f7c76
+HOST_GMP_VERSION	:= 6.1.0
+HOST_GMP_MD5		:= a9868ef2556ad6a2909babcd1428f3c7
 HOST_GMP		:= gmp-$(HOST_GMP_VERSION)
 HOST_GMP_SUFFIX		:= tar.xz
 HOST_GMP_URL		:= $(call ptx/mirror, GNU, gmp/$(HOST_GMP).$(HOST_GMP_SUFFIX))
-- 
2.6.4


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[ptxdist] [PATCH 2/6] host-isl: bump version to 0.14.1

[Clemens Gruber]

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 rules/host-isl.make | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/host-isl.make b/rules/host-isl.make
index f6ad3c1..e86b098 100644
--- a/rules/host-isl.make
+++ b/rules/host-isl.make
@@ -16,8 +16,8 @@ HOST_PACKAGES-$(PTXCONF_HOST_ISL) += host-isl
 #
 # Paths and names
 #
-HOST_ISL_VERSION	:= 0.12.2
-HOST_ISL_MD5		:= e039bfcfb6c2ab039b8ee69bf883e824
+HOST_ISL_VERSION	:= 0.14.1
+HOST_ISL_MD5		:= 118d1a379abf7606a3334c98a8411c79
 HOST_ISL		:= isl-$(HOST_ISL_VERSION)
 HOST_ISL_SUFFIX		:= tar.bz2
 HOST_ISL_URL		:= http://isl.gforge.inria.fr/$(HOST_ISL).$(HOST_ISL_SUFFIX)
-- 
2.6.4


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[ptxdist] [PATCH 3/6] host-libelf: bump version to 0.164

[Clemens Gruber]

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 rules/host-libelf.make | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/host-libelf.make b/rules/host-libelf.make
index d0bb0ac..611be4d 100644
--- a/rules/host-libelf.make
+++ b/rules/host-libelf.make
@@ -16,8 +16,8 @@ HOST_PACKAGES-$(PTXCONF_HOST_LIBELF) += host-libelf
 #
 # Paths and names
 #
-HOST_LIBELF_VERSION	:= 0.160
-HOST_LIBELF_MD5		:= 7527f22dff8b1ac8c122cfc4d3d3bb1e
+HOST_LIBELF_VERSION	:= 0.164
+HOST_LIBELF_MD5		:= 2e4536c1c48034f188a80789a59114d8
 HOST_LIBELF		:= elfutils-$(HOST_LIBELF_VERSION)
 HOST_LIBELF_SUFFIX	:= tar.bz2
 HOST_LIBELF_URL		:= https://fedorahosted.org/releases/e/l/elfutils/$(HOST_LIBELF_VERSION)/$(HOST_LIBELF).$(HOST_LIBELF_SUFFIX)
-- 
2.6.4


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[ptxdist] [PATCH 4/6] host-mpc: bump version to 1.0.3

[Clemens Gruber]

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 rules/host-mpc.make | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/host-mpc.make b/rules/host-mpc.make
index 156b8e1..e257151 100644
--- a/rules/host-mpc.make
+++ b/rules/host-mpc.make
@@ -16,8 +16,8 @@ HOST_PACKAGES-$(PTXCONF_HOST_MPC) += host-mpc
 #
 # Paths and names
 #
-HOST_MPC_VERSION	:= 1.0.2
-HOST_MPC_MD5		:= 68fadff3358fb3e7976c7a398a0af4c3
+HOST_MPC_VERSION	:= 1.0.3
+HOST_MPC_MD5		:= d6a1d5f8ddea3abd2cc3e98f58352d26
 HOST_MPC		:= mpc-$(HOST_MPC_VERSION)
 HOST_MPC_SUFFIX		:= tar.gz
 HOST_MPC_URL		:= http://www.multiprecision.org/mpc/download/$(HOST_MPC).$(HOST_MPC_SUFFIX)
-- 
2.6.4


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[ptxdist] [PATCH 5/6] host-mpfr: bump version to 3.1.3

[Clemens Gruber]

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 rules/host-mpfr.make | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/host-mpfr.make b/rules/host-mpfr.make
index 5586601..13da63d 100644
--- a/rules/host-mpfr.make
+++ b/rules/host-mpfr.make
@@ -16,8 +16,8 @@ HOST_PACKAGES-$(PTXCONF_HOST_MPFR) += host-mpfr
 #
 # Paths and names
 #
-HOST_MPFR_VERSION	:= 3.1.2
-HOST_MPFR_MD5		:= ee2c3ac63bf0c2359bf08fc3ee094c19
+HOST_MPFR_VERSION	:= 3.1.3
+HOST_MPFR_MD5		:= 5fdfa3cfa5c86514ee4a241a1affa138
 HOST_MPFR		:= mpfr-$(HOST_MPFR_VERSION)
 HOST_MPFR_SUFFIX	:= tar.bz2
 HOST_MPFR_SOURCE	:= $(SRCDIR)/$(HOST_MPFR).$(HOST_MPFR_SUFFIX)
-- 
2.6.4


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[ptxdist] [PATCH 6/6] host-xz: bump version to 5.2.2

[Clemens Gruber]

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 rules/host-xz.make | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/host-xz.make b/rules/host-xz.make
index f73e676..75926ff 100644
--- a/rules/host-xz.make
+++ b/rules/host-xz.make
@@ -16,8 +16,8 @@ HOST_PACKAGES-$(PTXCONF_HOST_XZ) += host-xz
 #
 # Paths and names
 #
-HOST_XZ_VERSION	:= 5.0.7
-HOST_XZ_MD5	:= 5b8c56cc95bee12e4fbd80e8b721773e
+HOST_XZ_VERSION	:= 5.2.2
+HOST_XZ_MD5	:= f90c9a0c8b259aee2234c4e0d7fd70af
 HOST_XZ		:= xz-$(HOST_XZ_VERSION)
 HOST_XZ_SUFFIX	:= tar.bz2
 HOST_XZ_URL	:= http://tukaani.org/xz/$(HOST_XZ).$(HOST_XZ_SUFFIX)
-- 
2.6.4


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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Robert Schwebel]

Hi Clemens,

On Sun, Dec 13, 2015 at 04:34:43PM +0100, Clemens Gruber wrote:
> the used host-xz version was not available anymore, I therefore updated
> it and in the process, decided to update some of the other host
> libraries as well.
> 
> In the next patch following these host tool version bumps, I made a
> first attempt to move to current stable gcc, glibc, binutils and gdb.
> (Just as a starting point, marked RFC)

Thanks for your patches, but Michael is already testing the toolchain
for the new december release. Please stay tuned, a release is already
being prepared based on the latest-and-greatest.

rsc
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Ladislav Michl]

On Sun, Dec 13, 2015 at 08:37:14PM +0100, Robert Schwebel wrote:
> Hi Clemens,
> 
> On Sun, Dec 13, 2015 at 04:34:43PM +0100, Clemens Gruber wrote:
> > the used host-xz version was not available anymore, I therefore updated
> > it and in the process, decided to update some of the other host
> > libraries as well.
> > 
> > In the next patch following these host tool version bumps, I made a
> > first attempt to move to current stable gcc, glibc, binutils and gdb.
> > (Just as a starting point, marked RFC)
> 
> Thanks for your patches, but Michael is already testing the toolchain
> for the new december release. Please stay tuned, a release is already
> being prepared based on the latest-and-greatest.

Hi Robert,

staying tunned is not enough ;-) Is there any preview available? I just
checked pengutronix' git and didn't find anything related.
I need this patch included: https://gcc.gnu.org/ml/gcc-patches/2012-07/msg01483.html
and will eventuely provide patch against OSELAS.Toolchain if needed.

Best regards,
	ladis

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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Michael Olbrich]

On Mon, Dec 14, 2015 at 02:51:45PM +0100, Ladislav Michl wrote:
> On Sun, Dec 13, 2015 at 08:37:14PM +0100, Robert Schwebel wrote:
> > Hi Clemens,
> > 
> > On Sun, Dec 13, 2015 at 04:34:43PM +0100, Clemens Gruber wrote:
> > > the used host-xz version was not available anymore, I therefore updated
> > > it and in the process, decided to update some of the other host
> > > libraries as well.
> > > 
> > > In the next patch following these host tool version bumps, I made a
> > > first attempt to move to current stable gcc, glibc, binutils and gdb.
> > > (Just as a starting point, marked RFC)
> > 
> > Thanks for your patches, but Michael is already testing the toolchain
> > for the new december release. Please stay tuned, a release is already
> > being prepared based on the latest-and-greatest.
> 
> Hi Robert,
> 
> staying tunned is not enough ;-) Is there any preview available? I just
> checked pengutronix' git and didn't find anything related.
> I need this patch included: https://gcc.gnu.org/ml/gcc-patches/2012-07/msg01483.html
> and will eventuely provide patch against OSELAS.Toolchain if needed.

This is fixed in gcc-5.3 right? That's the compiler the new toolchain will
use.

Michael

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Clemens Gruber]

On Thu, Dec 17, 2015 at 11:49:17AM +0100, Michael Olbrich wrote:
> On Mon, Dec 14, 2015 at 02:51:45PM +0100, Ladislav Michl wrote:
> > On Sun, Dec 13, 2015 at 08:37:14PM +0100, Robert Schwebel wrote:
> > > Hi Clemens,
> > > 
> > > On Sun, Dec 13, 2015 at 04:34:43PM +0100, Clemens Gruber wrote:
> > > > the used host-xz version was not available anymore, I therefore updated
> > > > it and in the process, decided to update some of the other host
> > > > libraries as well.
> > > > 
> > > > In the next patch following these host tool version bumps, I made a
> > > > first attempt to move to current stable gcc, glibc, binutils and gdb.
> > > > (Just as a starting point, marked RFC)
> > > 
> > > Thanks for your patches, but Michael is already testing the toolchain
> > > for the new december release. Please stay tuned, a release is already
> > > being prepared based on the latest-and-greatest.
> > 
> > Hi Robert,
> > 
> > staying tunned is not enough ;-) Is there any preview available? I just
> > checked pengutronix' git and didn't find anything related.
> > I need this patch included: https://gcc.gnu.org/ml/gcc-patches/2012-07/msg01483.html
> > and will eventuely provide patch against OSELAS.Toolchain if needed.
> 
> This is fixed in gcc-5.3 right? That's the compiler the new toolchain will
> use.
> 
> Michael

Yes, this is fixed in 5.3!
See libstdc++-v3/libsupc++/eh_personality.cc, line 385.

Btw.: Michael, it would be great if you could push your current
development state of OSELAS.Toolchain to git.pengutronix.de to see where
you are at.

Thanks.
Clemens

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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Jon Ringle]

On Sun, Dec 13, 2015 at 2:37 PM, Robert Schwebel
<r.schwebel@pengutronix.de> wrote:
> Thanks for your patches, but Michael is already testing the toolchain
> for the new december release. Please stay tuned, a release is already
> being prepared based on the latest-and-greatest.

What is the status of the new oselas toolchain?
We're concerned about CVE-2015-7547 (google it), which is fixed in glibc-2.23

Thanks,
Jon

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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Erwin Rol]

On 18-2-2016 20:03, Jon Ringle wrote:
> On Sun, Dec 13, 2015 at 2:37 PM, Robert Schwebel
> <r.schwebel@pengutronix.de> wrote:
>> Thanks for your patches, but Michael is already testing the toolchain
>> for the new december release. Please stay tuned, a release is already
>> being prepared based on the latest-and-greatest.
> 
> What is the status of the new oselas toolchain?
> We're concerned about CVE-2015-7547 (google it), which is fixed in glibc-2.23

I second the concerns, a "official" ptxdist toolchain update would be nice.

- Erwin

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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Robert Schwebel]

On Thu, Feb 18, 2016 at 08:06:39PM +0100, Erwin Rol wrote:
> >> Thanks for your patches, but Michael is already testing the toolchain
> >> for the new december release. Please stay tuned, a release is already
> >> being prepared based on the latest-and-greatest.
> > 
> > What is the status of the new oselas toolchain?
> > We're concerned about CVE-2015-7547 (google it), which is fixed in glibc-2.23
> 
> I second the concerns, a "official" ptxdist toolchain update would be nice.

The patches have already been backported and Michael is testing the
toolchain updates.

rsc
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Bruno Thomsen]

> > >
> > > What is the status of the new oselas toolchain?
> > > We're concerned about CVE-2015-7547 (google it), which is fixed in
> > > glibc-2.23
> >
> > I second the concerns, a "official" ptxdist toolchain update would be nice.

+1

>
> The patches have already been backported and Michael is testing the toolchain updates.

Do you have an approx. ETA on the new toolchain? Are we talking weeks or months?


Venlig hilsen / Best regards
Kamstrup A/S
Bruno Thomsen
Development engineer
Technology

Kamstrup A/S
Industrivej 28
DK-8660 Skanderborg
T: +45 89 93 10 00
D: +45 89 93 13 94

bth@kamstrup.com
kamstrup.com
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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Michael Olbrich]

On Fri, Feb 19, 2016 at 07:42:47AM +0000, Bruno Thomsen wrote:
> > > >
> > > > What is the status of the new oselas toolchain?
> > > > We're concerned about CVE-2015-7547 (google it), which is fixed in
> > > > glibc-2.23
> > >
> > > I second the concerns, a "official" ptxdist toolchain update would be nice.
> 
> +1
> 
> >
> > The patches have already been backported and Michael is testing the toolchain updates.
> 
> Do you have an approx. ETA on the new toolchain? Are we talking weeks or months?

I've pushed the relevant commits to the toolchain git. I expect, that
source tarballs with new releases will probably follow next week.

Note: I've added some build fixes for the older releases, but you'll
probably need to use a gcc-4.x as host compiler (set it in "ptxdist setup"
if necessary).

Michael

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Pengutronix e.K.                           |                             |
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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Clemens Gruber]

Hi Michael,

On Fri, Feb 19, 2016 at 02:56:41PM +0100, Michael Olbrich wrote:
> I've pushed the relevant commits to the toolchain git. I expect, that
> source tarballs with new releases will probably follow next week.

We talked about a new toolchain with the latest and greatest (tm) a few
months ago.
It should include GCC 5.3, GDB 7.10.1, Binutils 2.26 and now glibc 2.23.

Are there any remaining problems with those new versions which delay the
release?

Would be nice if we could take a look at this new latest-and-greatest
toolchain on the master branch of the OSELAS.Toolchain git repository.

Thanks,
Clemens

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Re: [ptxdist] [PATCH 0/6] OSELAS.Toolchain host tool version bumps

[Clemens Gruber]

On Fri, Feb 19, 2016 at 03:59:56PM +0100, Clemens Gruber wrote:
> Hi Michael,
> 
> On Fri, Feb 19, 2016 at 02:56:41PM +0100, Michael Olbrich wrote:
> > I've pushed the relevant commits to the toolchain git. I expect, that
> > source tarballs with new releases will probably follow next week.
> 
> We talked about a new toolchain with the latest and greatest (tm) a few
> months ago.
> It should include GCC 5.3, GDB 7.10.1, Binutils 2.26 and now glibc 2.23.
> 
> Are there any remaining problems with those new versions which delay the
> release?
> 
> Would be nice if we could take a look at this new latest-and-greatest
> toolchain on the master branch of the OSELAS.Toolchain git repository.
> 
> Thanks,
> Clemens

I forgot to say:
I already use such a toolchain and only a few minor patch fixups were
necessary for arm-v7a-* (but it is clearly much more work to ensure that
it still works on every possible platform you support instead of one or
two)

Maybe it's also time to remove the glibc-ports entry as the major
architectures are included in glibc mainline since 2.19, right?

I'd also suggest adding --enable-stackguard-randomization to the glibc
default configure arguments.
Without it, every binary built with -fstack-protector uses the same
canary value (0xff0a0000).
With that option, the binary uses a different random canary at runtime
(different at each invocation, taken from /dev/urandom).
Debian and ArchLinux both have this option enabled since many years.

Cheers,
Clemens

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