Patchwork toolchain-internal: skip gcc-intermediate when possible

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Submitter Thomas Petazzoni
Date July 11, 2013, 2:06 p.m.
Message ID <1373551564-15418-1-git-send-email-thomas.petazzoni@free-electrons.com>
Download mbox | patch
Permalink /patch/258467/
State Superseded
Headers show

Comments

Thomas Petazzoni - July 11, 2013, 2:06 p.m.
When NPTL support was introduced, gcc required a three stages build
process. Since gcc 4.7, this is no longer necessary, and it is
possible to get back to a two stages build process. This patch takes
advantage of this, by doing a two stages build process when possible.

We introduce a few hidden kconfig options:

 * BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD, which is set by the gcc
   Config.in logic to indicate that the compiler might need a three
   stages build. Currently, all versions prior to 4.7.x are selecting
   this kconfig option.

 * BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD, which indicates whether
   the C library might need a three stages build. This is the case for
   eglibc, and uClibc when NPTL is enabled.

 * BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD finally is enabled when both
   of the previous options are enabled. It indicates that a three
   stages build is actually needed.

In addition to those options, the uClibc/gcc build logic is changed to
take use only a two stages build process when possible.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
This stuff is fairly tricky, so if people could test, it would be
great. Also, I am not necessarily entirely happy with the new
Config.in options and their naming, so if people have suggestions, I'm
interested.

 package/eglibc/eglibc.mk               |  5 +++--
 package/gcc/Config.in.host             | 12 ++++++++++++
 package/gcc/gcc-initial/gcc-initial.mk |  8 ++++++++
 package/uclibc/Config.in               |  1 +
 package/uclibc/uclibc.mk               |  5 +++--
 toolchain/Config.in                    |  9 +++++++++
 6 files changed, 36 insertions(+), 4 deletions(-)
Thomas Petazzoni - July 27, 2013, 1:20 p.m.
Hello,

Could someone review/test/comment the below patch?

Thanks,

Thomas

On Thu, 11 Jul 2013 16:06:04 +0200, Thomas Petazzoni wrote:
> When NPTL support was introduced, gcc required a three stages build
> process. Since gcc 4.7, this is no longer necessary, and it is
> possible to get back to a two stages build process. This patch takes
> advantage of this, by doing a two stages build process when possible.
> 
> We introduce a few hidden kconfig options:
> 
>  * BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD, which is set by the gcc
>    Config.in logic to indicate that the compiler might need a three
>    stages build. Currently, all versions prior to 4.7.x are selecting
>    this kconfig option.
> 
>  * BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD, which indicates whether
>    the C library might need a three stages build. This is the case for
>    eglibc, and uClibc when NPTL is enabled.
> 
>  * BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD finally is enabled when both
>    of the previous options are enabled. It indicates that a three
>    stages build is actually needed.
> 
> In addition to those options, the uClibc/gcc build logic is changed to
> take use only a two stages build process when possible.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
> This stuff is fairly tricky, so if people could test, it would be
> great. Also, I am not necessarily entirely happy with the new
> Config.in options and their naming, so if people have suggestions, I'm
> interested.
> 
>  package/eglibc/eglibc.mk               |  5 +++--
>  package/gcc/Config.in.host             | 12 ++++++++++++
>  package/gcc/gcc-initial/gcc-initial.mk |  8 ++++++++
>  package/uclibc/Config.in               |  1 +
>  package/uclibc/uclibc.mk               |  5 +++--
>  toolchain/Config.in                    |  9 +++++++++
>  6 files changed, 36 insertions(+), 4 deletions(-)
> 
> diff --git a/package/eglibc/eglibc.mk b/package/eglibc/eglibc.mk
> index ccdc210..8bac72f 100644
> --- a/package/eglibc/eglibc.mk
> +++ b/package/eglibc/eglibc.mk
> @@ -14,8 +14,9 @@ EGLIBC_LICENSE_FILES = libc/COPYING libc/COPYING.LIB libc/LICENSES
>  # cross-compiler and the kernel headers
>  EGLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-gawk
>  
> -# Before eglibc is built, we must have the second stage cross-compiler
> -eglibc-build: host-gcc-intermediate
> +# Before eglibc is built, we must have the second stage
> +# cross-compiler, for some gcc versions
> +eglibc-build: $(if $(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),host-gcc-intermediate)
>  
>  EGLIBC_SUBDIR = build
>  
> diff --git a/package/gcc/Config.in.host b/package/gcc/Config.in.host
> index 86f7fdc..e34f73e 100644
> --- a/package/gcc/Config.in.host
> +++ b/package/gcc/Config.in.host
> @@ -3,6 +3,12 @@ comment "GCC Options"
>  config BR2_GCC_NEEDS_MPC
>  	bool
>  
> +# Until gcc 4.7, a three stage build process was needed when using
> +# NPTL. This hidden option tells whether gcc is a version that
> +# requires this three stage build process.
> +config BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
> +	bool
> +
>  choice
>  	prompt "GCC compiler Version"
>  	default BR2_GCC_VERSION_4_4_X if BR2_sparc_sparchfleon || BR2_sparc_sparchfleonv8 || BR2_sparc_sparcsfleon || BR2_sparc_sparcsfleonv8
> @@ -15,28 +21,34 @@ choice
>  	config BR2_GCC_VERSION_4_4_7_ARC
>  		depends on BR2_arc
>  		bool "gcc 4.4.7-arc"
> +		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>  
>  	config BR2_GCC_VERSION_4_2_2_AVR32_2_1_5
>  		depends on BR2_avr32
>  		bool "gcc 4.2.2-avr32-2.1.5"
> +		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>  
>  	config BR2_GCC_VERSION_4_3_X
>  		depends on !BR2_arc && !BR2_avr32 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_cortex_a5 && !BR2_cortex_a7 && !BR2_cortex_a8 && !BR2_cortex_a9 && !BR2_cortex_a15 && !BR2_x86_atom && !BR2_powerpc_e300c2 && !BR2_powerpc_e300c3 && !BR2_powerpc_e500mc && !BR2_powerpc_464 && !BR2_powerpc_464fp && !BR2_powerpc_476 && !BR2_powerpc_476fp && !BR2_fa526 && !BR2_pj4
>  		bool "gcc 4.3.x"
> +		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>  
>  	config BR2_GCC_VERSION_4_4_X
>  		depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a5 && !BR2_cortex_a7 && !BR2_cortex_a15 && !BR2_x86_atom && !BR2_powerpc_476 && !BR2_powerpc_476fp && !BR2_fa526 && !BR2_pj4
>  		bool "gcc 4.4.x"
> +		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>  
>  	config BR2_GCC_VERSION_4_5_X
>  		depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a7 && !BR2_cortex_a15 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_fa526 && !BR2_pj4
>  		select BR2_GCC_NEEDS_MPC
>  		bool "gcc 4.5.x"
> +		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>  
>  	config BR2_GCC_VERSION_4_6_X
>  		depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a7 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_pj4
>  		select BR2_GCC_NEEDS_MPC
>  		bool "gcc 4.6.x"
> +		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>  
>  	config BR2_GCC_VERSION_4_7_X
>  		depends on !BR2_arc && !BR2_avr32 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_pj4
> diff --git a/package/gcc/gcc-initial/gcc-initial.mk b/package/gcc/gcc-initial/gcc-initial.mk
> index 05c956a..08c7028 100644
> --- a/package/gcc/gcc-initial/gcc-initial.mk
> +++ b/package/gcc/gcc-initial/gcc-initial.mk
> @@ -29,6 +29,7 @@ HOST_GCC_INITIAL_CONF_OPT = \
>  	--enable-languages=c \
>  	--disable-shared \
>  	--without-headers \
> +	--disable-threads \
>  	--with-newlib \
>  	--disable-largefile \
>  	--disable-nls
> @@ -36,4 +37,11 @@ HOST_GCC_INITIAL_CONF_OPT = \
>  HOST_GCC_INITIAL_MAKE_OPT = all-gcc
>  HOST_GCC_INITIAL_INSTALL_OPT = install-gcc
>  
> +ifeq ($(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),)
> +ifeq ($(BR2_GCC_SUPPORTS_FINEGRAINEDMTUNE),y)
> +HOST_GCC_INITIAL_MAKE_OPT += all-target-libgcc
> +HOST_GCC_INITIAL_INSTALL_OPT += install-target-libgcc
> +endif
> +endif
> +
>  $(eval $(host-autotools-package))
> diff --git a/package/uclibc/Config.in b/package/uclibc/Config.in
> index f309243..23f7ae0 100644
> --- a/package/uclibc/Config.in
> +++ b/package/uclibc/Config.in
> @@ -114,6 +114,7 @@ choice
>  	config BR2_PTHREADS_NATIVE
>  		bool "Native POSIX Threading (NPTL)"
>  	        select BR2_TOOLCHAIN_HAS_THREADS
> +		select BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
>  		depends on !BR2_ARM_OABI
>  		depends on !BR2_x86_i386
>  		depends on !BR2_avr32
> diff --git a/package/uclibc/uclibc.mk b/package/uclibc/uclibc.mk
> index 421e323..2dbf328 100644
> --- a/package/uclibc/uclibc.mk
> +++ b/package/uclibc/uclibc.mk
> @@ -22,8 +22,9 @@ UCLIBC_INSTALL_STAGING = YES
>  # cross-compiler and the kernel headers
>  UCLIBC_DEPENDENCIES = host-gcc-initial linux-headers
>  
> -# Before uClibc is built, we must have the second stage cross-compiler
> -uclibc-build: host-gcc-intermediate
> +# Before uClibc is built, we must have the second stage
> +# cross-compiler, for some gcc versions, and when NPTL is used.
> +uclibc-build: $(if $(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),host-gcc-intermediate)
>  
>  # specifying UCLIBC_CONFIG_FILE on the command-line overrides the .config
>  # setting.
> diff --git a/toolchain/Config.in b/toolchain/Config.in
> index 53d2573..64cdf81 100644
> --- a/toolchain/Config.in
> +++ b/toolchain/Config.in
> @@ -1,5 +1,13 @@
>  menu "Toolchain"
>  
> +config BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD
> +	bool
> +	default y if BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD && \
> +		BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
> +
> +config BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
> +	bool
> +
>  # Should be selected for glibc or eglibc
>  config BR2_TOOLCHAIN_USES_GLIBC
>  	bool
> @@ -10,6 +18,7 @@ config BR2_TOOLCHAIN_USES_GLIBC
>  	select BR2_TOOLCHAIN_HAS_THREADS
>  	select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
>  	select BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
> +	select BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
>  
>  config BR2_TOOLCHAIN_USES_UCLIBC
>  	bool
Fabio Porcedda - Aug. 22, 2013, 8:25 a.m.
On Sat, Jul 27, 2013 at 3:20 PM, Thomas Petazzoni
<thomas.petazzoni@free-electrons.com> wrote:
> Hello,
>
> Could someone review/test/comment the below patch?

This patch does not apply to master or next branch, i need to apply
some other patches before to apply this patch?

Applying: toolchain-internal: skip gcc-intermediate when possible
error: patch failed: package/gcc/Config.in.host:15
error: package/gcc/Config.in.host: patch does not apply
error: patch failed: package/gcc/gcc-initial/gcc-initial.mk:29
error: package/gcc/gcc-initial/gcc-initial.mk: patch does not apply
error: patch failed: package/uclibc/Config.in:114
error: package/uclibc/Config.in: patch does not apply
Patch failed at 0001 toolchain-internal: skip gcc-intermediate when possible

Best regards
Fabio Porcedda

> Thanks,
>
> Thomas
>
> On Thu, 11 Jul 2013 16:06:04 +0200, Thomas Petazzoni wrote:
>> When NPTL support was introduced, gcc required a three stages build
>> process. Since gcc 4.7, this is no longer necessary, and it is
>> possible to get back to a two stages build process. This patch takes
>> advantage of this, by doing a two stages build process when possible.
>>
>> We introduce a few hidden kconfig options:
>>
>>  * BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD, which is set by the gcc
>>    Config.in logic to indicate that the compiler might need a three
>>    stages build. Currently, all versions prior to 4.7.x are selecting
>>    this kconfig option.
>>
>>  * BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD, which indicates whether
>>    the C library might need a three stages build. This is the case for
>>    eglibc, and uClibc when NPTL is enabled.
>>
>>  * BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD finally is enabled when both
>>    of the previous options are enabled. It indicates that a three
>>    stages build is actually needed.
>>
>> In addition to those options, the uClibc/gcc build logic is changed to
>> take use only a two stages build process when possible.
>>
>> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
>> ---
>> This stuff is fairly tricky, so if people could test, it would be
>> great. Also, I am not necessarily entirely happy with the new
>> Config.in options and their naming, so if people have suggestions, I'm
>> interested.
>>
>>  package/eglibc/eglibc.mk               |  5 +++--
>>  package/gcc/Config.in.host             | 12 ++++++++++++
>>  package/gcc/gcc-initial/gcc-initial.mk |  8 ++++++++
>>  package/uclibc/Config.in               |  1 +
>>  package/uclibc/uclibc.mk               |  5 +++--
>>  toolchain/Config.in                    |  9 +++++++++
>>  6 files changed, 36 insertions(+), 4 deletions(-)
>>
>> diff --git a/package/eglibc/eglibc.mk b/package/eglibc/eglibc.mk
>> index ccdc210..8bac72f 100644
>> --- a/package/eglibc/eglibc.mk
>> +++ b/package/eglibc/eglibc.mk
>> @@ -14,8 +14,9 @@ EGLIBC_LICENSE_FILES = libc/COPYING libc/COPYING.LIB libc/LICENSES
>>  # cross-compiler and the kernel headers
>>  EGLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-gawk
>>
>> -# Before eglibc is built, we must have the second stage cross-compiler
>> -eglibc-build: host-gcc-intermediate
>> +# Before eglibc is built, we must have the second stage
>> +# cross-compiler, for some gcc versions
>> +eglibc-build: $(if $(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),host-gcc-intermediate)
>>
>>  EGLIBC_SUBDIR = build
>>
>> diff --git a/package/gcc/Config.in.host b/package/gcc/Config.in.host
>> index 86f7fdc..e34f73e 100644
>> --- a/package/gcc/Config.in.host
>> +++ b/package/gcc/Config.in.host
>> @@ -3,6 +3,12 @@ comment "GCC Options"
>>  config BR2_GCC_NEEDS_MPC
>>       bool
>>
>> +# Until gcc 4.7, a three stage build process was needed when using
>> +# NPTL. This hidden option tells whether gcc is a version that
>> +# requires this three stage build process.
>> +config BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>> +     bool
>> +
>>  choice
>>       prompt "GCC compiler Version"
>>       default BR2_GCC_VERSION_4_4_X if BR2_sparc_sparchfleon || BR2_sparc_sparchfleonv8 || BR2_sparc_sparcsfleon || BR2_sparc_sparcsfleonv8
>> @@ -15,28 +21,34 @@ choice
>>       config BR2_GCC_VERSION_4_4_7_ARC
>>               depends on BR2_arc
>>               bool "gcc 4.4.7-arc"
>> +             select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>>
>>       config BR2_GCC_VERSION_4_2_2_AVR32_2_1_5
>>               depends on BR2_avr32
>>               bool "gcc 4.2.2-avr32-2.1.5"
>> +             select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>>
>>       config BR2_GCC_VERSION_4_3_X
>>               depends on !BR2_arc && !BR2_avr32 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_cortex_a5 && !BR2_cortex_a7 && !BR2_cortex_a8 && !BR2_cortex_a9 && !BR2_cortex_a15 && !BR2_x86_atom && !BR2_powerpc_e300c2 && !BR2_powerpc_e300c3 && !BR2_powerpc_e500mc && !BR2_powerpc_464 && !BR2_powerpc_464fp && !BR2_powerpc_476 && !BR2_powerpc_476fp && !BR2_fa526 && !BR2_pj4
>>               bool "gcc 4.3.x"
>> +             select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>>
>>       config BR2_GCC_VERSION_4_4_X
>>               depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a5 && !BR2_cortex_a7 && !BR2_cortex_a15 && !BR2_x86_atom && !BR2_powerpc_476 && !BR2_powerpc_476fp && !BR2_fa526 && !BR2_pj4
>>               bool "gcc 4.4.x"
>> +             select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>>
>>       config BR2_GCC_VERSION_4_5_X
>>               depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a7 && !BR2_cortex_a15 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_fa526 && !BR2_pj4
>>               select BR2_GCC_NEEDS_MPC
>>               bool "gcc 4.5.x"
>> +             select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>>
>>       config BR2_GCC_VERSION_4_6_X
>>               depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a7 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_pj4
>>               select BR2_GCC_NEEDS_MPC
>>               bool "gcc 4.6.x"
>> +             select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>>
>>       config BR2_GCC_VERSION_4_7_X
>>               depends on !BR2_arc && !BR2_avr32 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_pj4
>> diff --git a/package/gcc/gcc-initial/gcc-initial.mk b/package/gcc/gcc-initial/gcc-initial.mk
>> index 05c956a..08c7028 100644
>> --- a/package/gcc/gcc-initial/gcc-initial.mk
>> +++ b/package/gcc/gcc-initial/gcc-initial.mk
>> @@ -29,6 +29,7 @@ HOST_GCC_INITIAL_CONF_OPT = \
>>       --enable-languages=c \
>>       --disable-shared \
>>       --without-headers \
>> +     --disable-threads \
>>       --with-newlib \
>>       --disable-largefile \
>>       --disable-nls
>> @@ -36,4 +37,11 @@ HOST_GCC_INITIAL_CONF_OPT = \
>>  HOST_GCC_INITIAL_MAKE_OPT = all-gcc
>>  HOST_GCC_INITIAL_INSTALL_OPT = install-gcc
>>
>> +ifeq ($(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),)
>> +ifeq ($(BR2_GCC_SUPPORTS_FINEGRAINEDMTUNE),y)
>> +HOST_GCC_INITIAL_MAKE_OPT += all-target-libgcc
>> +HOST_GCC_INITIAL_INSTALL_OPT += install-target-libgcc
>> +endif
>> +endif
>> +
>>  $(eval $(host-autotools-package))
>> diff --git a/package/uclibc/Config.in b/package/uclibc/Config.in
>> index f309243..23f7ae0 100644
>> --- a/package/uclibc/Config.in
>> +++ b/package/uclibc/Config.in
>> @@ -114,6 +114,7 @@ choice
>>       config BR2_PTHREADS_NATIVE
>>               bool "Native POSIX Threading (NPTL)"
>>               select BR2_TOOLCHAIN_HAS_THREADS
>> +             select BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
>>               depends on !BR2_ARM_OABI
>>               depends on !BR2_x86_i386
>>               depends on !BR2_avr32
>> diff --git a/package/uclibc/uclibc.mk b/package/uclibc/uclibc.mk
>> index 421e323..2dbf328 100644
>> --- a/package/uclibc/uclibc.mk
>> +++ b/package/uclibc/uclibc.mk
>> @@ -22,8 +22,9 @@ UCLIBC_INSTALL_STAGING = YES
>>  # cross-compiler and the kernel headers
>>  UCLIBC_DEPENDENCIES = host-gcc-initial linux-headers
>>
>> -# Before uClibc is built, we must have the second stage cross-compiler
>> -uclibc-build: host-gcc-intermediate
>> +# Before uClibc is built, we must have the second stage
>> +# cross-compiler, for some gcc versions, and when NPTL is used.
>> +uclibc-build: $(if $(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),host-gcc-intermediate)
>>
>>  # specifying UCLIBC_CONFIG_FILE on the command-line overrides the .config
>>  # setting.
>> diff --git a/toolchain/Config.in b/toolchain/Config.in
>> index 53d2573..64cdf81 100644
>> --- a/toolchain/Config.in
>> +++ b/toolchain/Config.in
>> @@ -1,5 +1,13 @@
>>  menu "Toolchain"
>>
>> +config BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD
>> +     bool
>> +     default y if BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD && \
>> +             BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
>> +
>> +config BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
>> +     bool
>> +
>>  # Should be selected for glibc or eglibc
>>  config BR2_TOOLCHAIN_USES_GLIBC
>>       bool
>> @@ -10,6 +18,7 @@ config BR2_TOOLCHAIN_USES_GLIBC
>>       select BR2_TOOLCHAIN_HAS_THREADS
>>       select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
>>       select BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
>> +     select BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
>>
>>  config BR2_TOOLCHAIN_USES_UCLIBC
>>       bool
>
>
>
> --
> Thomas Petazzoni, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com
> _______________________________________________
> buildroot mailing list
> buildroot@busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot
Thomas Petazzoni - Aug. 23, 2013, 4:58 a.m.
Dear Fabio Porcedda,

On Thu, 22 Aug 2013 10:25:08 +0200, Fabio Porcedda wrote:
> On Sat, Jul 27, 2013 at 3:20 PM, Thomas Petazzoni
> <thomas.petazzoni@free-electrons.com> wrote:
> > Hello,
> >
> > Could someone review/test/comment the below patch?
> 
> This patch does not apply to master or next branch, i need to apply
> some other patches before to apply this patch?

No, it's just that other patches got merged since the patch was
written, so it no longer applies. I need to rebase it on top of the
next branch.

Thanks!

Thomas

Patch

diff --git a/package/eglibc/eglibc.mk b/package/eglibc/eglibc.mk
index ccdc210..8bac72f 100644
--- a/package/eglibc/eglibc.mk
+++ b/package/eglibc/eglibc.mk
@@ -14,8 +14,9 @@  EGLIBC_LICENSE_FILES = libc/COPYING libc/COPYING.LIB libc/LICENSES
 # cross-compiler and the kernel headers
 EGLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-gawk
 
-# Before eglibc is built, we must have the second stage cross-compiler
-eglibc-build: host-gcc-intermediate
+# Before eglibc is built, we must have the second stage
+# cross-compiler, for some gcc versions
+eglibc-build: $(if $(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),host-gcc-intermediate)
 
 EGLIBC_SUBDIR = build
 
diff --git a/package/gcc/Config.in.host b/package/gcc/Config.in.host
index 86f7fdc..e34f73e 100644
--- a/package/gcc/Config.in.host
+++ b/package/gcc/Config.in.host
@@ -3,6 +3,12 @@  comment "GCC Options"
 config BR2_GCC_NEEDS_MPC
 	bool
 
+# Until gcc 4.7, a three stage build process was needed when using
+# NPTL. This hidden option tells whether gcc is a version that
+# requires this three stage build process.
+config BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
+	bool
+
 choice
 	prompt "GCC compiler Version"
 	default BR2_GCC_VERSION_4_4_X if BR2_sparc_sparchfleon || BR2_sparc_sparchfleonv8 || BR2_sparc_sparcsfleon || BR2_sparc_sparcsfleonv8
@@ -15,28 +21,34 @@  choice
 	config BR2_GCC_VERSION_4_4_7_ARC
 		depends on BR2_arc
 		bool "gcc 4.4.7-arc"
+		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
 
 	config BR2_GCC_VERSION_4_2_2_AVR32_2_1_5
 		depends on BR2_avr32
 		bool "gcc 4.2.2-avr32-2.1.5"
+		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
 
 	config BR2_GCC_VERSION_4_3_X
 		depends on !BR2_arc && !BR2_avr32 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_cortex_a5 && !BR2_cortex_a7 && !BR2_cortex_a8 && !BR2_cortex_a9 && !BR2_cortex_a15 && !BR2_x86_atom && !BR2_powerpc_e300c2 && !BR2_powerpc_e300c3 && !BR2_powerpc_e500mc && !BR2_powerpc_464 && !BR2_powerpc_464fp && !BR2_powerpc_476 && !BR2_powerpc_476fp && !BR2_fa526 && !BR2_pj4
 		bool "gcc 4.3.x"
+		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
 
 	config BR2_GCC_VERSION_4_4_X
 		depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a5 && !BR2_cortex_a7 && !BR2_cortex_a15 && !BR2_x86_atom && !BR2_powerpc_476 && !BR2_powerpc_476fp && !BR2_fa526 && !BR2_pj4
 		bool "gcc 4.4.x"
+		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
 
 	config BR2_GCC_VERSION_4_5_X
 		depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a7 && !BR2_cortex_a15 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_fa526 && !BR2_pj4
 		select BR2_GCC_NEEDS_MPC
 		bool "gcc 4.5.x"
+		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
 
 	config BR2_GCC_VERSION_4_6_X
 		depends on !BR2_arc && !BR2_avr32 && !BR2_cortex_a7 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_pj4
 		select BR2_GCC_NEEDS_MPC
 		bool "gcc 4.6.x"
+		select BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
 
 	config BR2_GCC_VERSION_4_7_X
 		depends on !BR2_arc && !BR2_avr32 && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_pj4
diff --git a/package/gcc/gcc-initial/gcc-initial.mk b/package/gcc/gcc-initial/gcc-initial.mk
index 05c956a..08c7028 100644
--- a/package/gcc/gcc-initial/gcc-initial.mk
+++ b/package/gcc/gcc-initial/gcc-initial.mk
@@ -29,6 +29,7 @@  HOST_GCC_INITIAL_CONF_OPT = \
 	--enable-languages=c \
 	--disable-shared \
 	--without-headers \
+	--disable-threads \
 	--with-newlib \
 	--disable-largefile \
 	--disable-nls
@@ -36,4 +37,11 @@  HOST_GCC_INITIAL_CONF_OPT = \
 HOST_GCC_INITIAL_MAKE_OPT = all-gcc
 HOST_GCC_INITIAL_INSTALL_OPT = install-gcc
 
+ifeq ($(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),)
+ifeq ($(BR2_GCC_SUPPORTS_FINEGRAINEDMTUNE),y)
+HOST_GCC_INITIAL_MAKE_OPT += all-target-libgcc
+HOST_GCC_INITIAL_INSTALL_OPT += install-target-libgcc
+endif
+endif
+
 $(eval $(host-autotools-package))
diff --git a/package/uclibc/Config.in b/package/uclibc/Config.in
index f309243..23f7ae0 100644
--- a/package/uclibc/Config.in
+++ b/package/uclibc/Config.in
@@ -114,6 +114,7 @@  choice
 	config BR2_PTHREADS_NATIVE
 		bool "Native POSIX Threading (NPTL)"
 	        select BR2_TOOLCHAIN_HAS_THREADS
+		select BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
 		depends on !BR2_ARM_OABI
 		depends on !BR2_x86_i386
 		depends on !BR2_avr32
diff --git a/package/uclibc/uclibc.mk b/package/uclibc/uclibc.mk
index 421e323..2dbf328 100644
--- a/package/uclibc/uclibc.mk
+++ b/package/uclibc/uclibc.mk
@@ -22,8 +22,9 @@  UCLIBC_INSTALL_STAGING = YES
 # cross-compiler and the kernel headers
 UCLIBC_DEPENDENCIES = host-gcc-initial linux-headers
 
-# Before uClibc is built, we must have the second stage cross-compiler
-uclibc-build: host-gcc-intermediate
+# Before uClibc is built, we must have the second stage
+# cross-compiler, for some gcc versions, and when NPTL is used.
+uclibc-build: $(if $(BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD),host-gcc-intermediate)
 
 # specifying UCLIBC_CONFIG_FILE on the command-line overrides the .config
 # setting.
diff --git a/toolchain/Config.in b/toolchain/Config.in
index 53d2573..64cdf81 100644
--- a/toolchain/Config.in
+++ b/toolchain/Config.in
@@ -1,5 +1,13 @@ 
 menu "Toolchain"
 
+config BR2_TOOLCHAIN_NEEDS_THREE_STAGE_BUILD
+	bool
+	default y if BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD && \
+		BR2_GCC_VERSION_NEEDS_THREE_STAGE_BUILD
+
+config BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
+	bool
+
 # Should be selected for glibc or eglibc
 config BR2_TOOLCHAIN_USES_GLIBC
 	bool
@@ -10,6 +18,7 @@  config BR2_TOOLCHAIN_USES_GLIBC
 	select BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
 	select BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
+	select BR2_TOOLCHAIN_LIBC_NEEDS_THREE_STAGE_BUILD
 
 config BR2_TOOLCHAIN_USES_UCLIBC
 	bool