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toolchain-internal: skip gcc-intermediate when possible

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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
use only a two stages build process when possible.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas Petazzoni
2013-09-02 18:06:29 +02:00
committed by Peter Korsgaard
parent a8164107ec
commit 2babed4a50
6 changed files with 35 additions and 4 deletions
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9
toolchain/Config.in
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@@ -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