814f63ec32
Add a new option BR2_GCC_ENABLE_LTO that builds gcc and binutils with
LTO support.
Individual packages still have to enable LTO explicitly by passing '-flto' to
GCC, which passes it on to the linker. This option does not add that flag
globally. Some packages detect if the compiler supports LTO and enable the flag
if it does.
To support LTO, ar and ranlib must be called with an argument which triggers the
usage of the LTO plugin. Since GCC doesn't call these tools itself, it instead
provides wrappers for ar and ranlib that pass the LTO arguments. This way
existing Makefiles don't need to be changed for LTO support. However, these
wrappers are called <tuple>-gcc-ar which matches the pattern to link to the
buildroot wrapper in the external toolchain logic. So the external toolchain
logic is updated to provide the correct symlink.
[Thomas:
- Add a separate BR2_BINUTILS_ENABLE_LTO option to enable LTO
support in binutils. This is a blind option, selected by
BR2_GCC_ENABLE_LTO. It just avoids having binutils.mk poke
directly into gcc Config.in options.
- Remove the check on the AVR32 special gcc version, which we don't
support anymore.
- Adapt the help text of the LTO Config.in option to no longer
mention "Since version 4.5", since we only support gcc >= 4.5 in
Buildroot anyway.
- Fix typo in toolchain-external.mk comment.]
Signed-off-by: Peter Kümmel <syntheticpp@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
154 lines
4.7 KiB
Plaintext
154 lines
4.7 KiB
Plaintext
comment "GCC Options"
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config BR2_GCC_NEEDS_MPC
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bool
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config BR2_GCC_SUPPORTS_GRAPHITE
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bool
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choice
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prompt "GCC compiler Version"
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default BR2_GCC_VERSION_4_8_ARC if BR2_arc
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default BR2_GCC_VERSION_4_9_X if BR2_microblaze || BR2_powerpc64le
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default BR2_GCC_VERSION_4_5_X if BR2_bfin
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default BR2_GCC_VERSION_4_8_X
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help
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Select the version of gcc you wish to use.
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config BR2_GCC_VERSION_4_5_X
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bool "gcc 4.5.x"
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# Broken or unsupported architectures
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depends on !BR2_microblaze && !BR2_aarch64 && !BR2_arc \
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&& !BR2_powerpc64le && !BR2_nios2
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# Broken or unsupported ARM cores
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depends on !BR2_cortex_a7 && !BR2_cortex_a12 && \
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!BR2_cortex_a15 && !BR2_fa526 && !BR2_pj4
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# Broken or unsupported PPC cores
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depends on !BR2_powerpc_e5500 && !BR2_powerpc_e6500 && \
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!BR2_powerpc_power8
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# SPARC -mcpu=leon3 appeared in gcc 4.8.x
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depends on !BR2_sparc_leon3
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# Broken or unsupported X86 cores
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depends on !BR2_x86_corei7 && !BR2_x86_jaguar && !BR2_x86_steamroller
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# ARM EABIhf support appeared in gcc 4.6
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depends on !BR2_ARM_EABIHF
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# musl patches only for gcc 4.7+
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depends on !BR2_TOOLCHAIN_BUILDROOT_MUSL
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select BR2_GCC_NEEDS_MPC
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config BR2_GCC_VERSION_4_7_X
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bool "gcc 4.7.x"
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# Broken or unsupported architectures
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depends on !BR2_microblaze && !BR2_aarch64 && !BR2_arc \
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&& !BR2_bfin && !BR2_powerpc64le && !BR2_nios2
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# Broken or unsupported ARM cores
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depends on !BR2_cortex_a12 && !BR2_pj4
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# Broken or unsupported PPC cores
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depends on !BR2_powerpc_e5500 && !BR2_powerpc_e6500 && \
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!BR2_powerpc_power8
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# SPARC -mcpu=leon3 appeared in gcc 4.8.x
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depends on !BR2_sparc_leon3
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# Broken or unsupported x86 cores
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depends on !BR2_x86_jaguar && !BR2_x86_steamroller
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select BR2_GCC_NEEDS_MPC
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config BR2_GCC_VERSION_4_8_X
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bool "gcc 4.8.x"
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# Broken or unsupported architectures
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depends on !BR2_microblaze && !BR2_arc \
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&& !BR2_bfin && !BR2_powerpc64le && !BR2_nios2
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# Broken or unsupported ARM cores
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depends on !BR2_cortex_a12
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# Broken or unsupported PPC cores
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depends on !BR2_powerpc_power8
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select BR2_GCC_NEEDS_MPC
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select BR2_GCC_SUPPORTS_GRAPHITE
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config BR2_GCC_VERSION_4_8_ARC
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bool "gcc 4.8-arc"
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# Only supported architecture
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depends on BR2_arc
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select BR2_GCC_NEEDS_MPC
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config BR2_GCC_VERSION_4_9_X
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bool "gcc 4.9.x"
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# Broken or unsupported architectures
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depends on !BR2_arc && !BR2_bfin
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# PR60102 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60102
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select BR2_GCC_NEEDS_MPC
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select BR2_GCC_SUPPORTS_GRAPHITE
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endchoice
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config BR2_GCC_SUPPORTS_FINEGRAINEDMTUNE
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bool
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default y
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config BR2_GCC_VERSION
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string
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default "4.5.4" if BR2_GCC_VERSION_4_5_X
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default "4.7.4" if BR2_GCC_VERSION_4_7_X
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default "4.8.4" if BR2_GCC_VERSION_4_8_X
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default "4.9.2" if BR2_GCC_VERSION_4_9_X
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default "arc-2014.12" if BR2_GCC_VERSION_4_8_ARC
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config BR2_EXTRA_GCC_CONFIG_OPTIONS
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string "Additional gcc options"
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default ""
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help
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Any additional gcc configure options you may want to
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include. Those options are applied for all of the gcc
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initial, gcc intermediate and gcc final passes.
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config BR2_TOOLCHAIN_BUILDROOT_CXX
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bool "Enable C++ support"
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select BR2_INSTALL_LIBSTDCPP
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help
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Enable this option if you want your toolchain to support the
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C++ language and you want C++ libraries to be installed on
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your target system.
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config BR2_GCC_ENABLE_TLS
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bool "Enable compiler tls support" if BR2_TOOLCHAIN_BUILDROOT_UCLIBC
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default y
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depends on BR2_PTHREADS_NATIVE || BR2_TOOLCHAIN_BUILDROOT_EGLIBC || BR2_TOOLCHAIN_BUILDROOT_GLIBC
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help
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Enable the compiler to generate code for accessing
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thread local storage variables
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config BR2_GCC_ENABLE_LTO
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bool "Enable compiler link-time-optimization support"
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select BR2_BINUTILS_ENABLE_LTO
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help
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This option enables link-time optimization (LTO) support in
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gcc.
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config BR2_GCC_ENABLE_OPENMP
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bool "Enable compiler OpenMP support"
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depends on !BR2_PTHREADS_NONE && !BR2_arc && !BR2_microblaze
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help
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Enable OpenMP support for the compiler
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config BR2_GCC_ENABLE_LIBMUDFLAP
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bool "Enable libmudflap support"
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# There are architectures, or specific configurations for
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# which mudflap is not supported.
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depends on !BR2_bfin && !BR2_ARM_INSTRUCTIONS_THUMB && !BR2_powerpc_SPE
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depends on !BR2_GCC_VERSION_4_9_X
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help
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libmudflap is a gcc library used for the mudflap pointer
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debugging functionality. It is only needed if you intend to
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use the -fmudflap gcc flag.
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See http://gcc.gnu.org/wiki/Mudflap_Pointer_Debugging and
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the help of the gcc -fmudflap option for more details.
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If you're unsure, leave this option disabled.
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config BR2_GCC_ENABLE_GRAPHITE
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bool "Enable graphite support"
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depends on BR2_GCC_SUPPORTS_GRAPHITE
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help
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This option enables the graphite optimizations in the
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compiler.
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