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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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5
package/eglibc/eglibc.mk
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@ -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

11
package/gcc/Config.in.host
View File

@ -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
@ -16,11 +22,13 @@ choice
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
depends on !BR2_ARM_EABIHF
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
@ -29,6 +37,7 @@ choice
depends on !BR2_ARM_EABIHF
# VFPv4 support appeared in gcc 4.5
depends on !BR2_ARM_FPU_VFPV4 && !BR2_ARM_FPU_VFPV4D16
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
@ -36,11 +45,13 @@ choice
# ARM EABIhf support appeared in gcc 4.6
depends on !BR2_ARM_EABIHF
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_bfin && !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_bfin && !BR2_sparc_sparchfleon && !BR2_sparc_sparchfleonv8 && !BR2_sparc_sparcsfleon && !BR2_sparc_sparcsfleonv8 && !BR2_pj4

8
package/gcc/gcc-initial/gcc-initial.mk
View File

@ -29,6 +29,7 @@ HOST_GCC_INITIAL_CONF_OPT = \
--enable-languages=c \
--disable-shared \
--without-headers \
--disable-threads \
--with-newlib \
--disable-largefile \
--disable-nls \
@ -40,4 +41,11 @@ HOST_GCC_INITIAL_CONF_ENV = \
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))

1
package/uclibc/Config.in
View File

@ -115,6 +115,7 @@ 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_arc
depends on !BR2_avr32
depends on !BR2_bfin

5
package/uclibc/uclibc.mk
View File

@ -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.

9
toolchain/Config.in
View File

@ -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