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https://github.com/crosstool-ng/crosstool-ng.git
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20a8525e8b
Make this behavior default in case the core gcc backend is used for final compiler (i.e., for baremetal configurations). Not setting this option breaks canadian baremetal configurations, and not setting it makes little sense at all in any baremetal configuration (since in baremetal we don't have any libc to begin with). Signed-off-by: Alexey Neyman <stilor@att.net>
388 lines
12 KiB
Groff
388 lines
12 KiB
Groff
# gcc configuration options
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config CC_GCC_ENABLE_CXX_FLAGS
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string
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prompt "Flags to pass to --enable-cxx-flags"
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default ""
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help
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Enter here the value of the gcc's ./configure option --enable-cxx-flags.
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Leave empty if you don't know better.
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Note: just pass in the option _value_, that is only the part that goes
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after the '=' sign.
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config CC_GCC_CORE_EXTRA_CONFIG_ARRAY
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string
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prompt "Core gcc extra config"
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default ""
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depends on CC_CORE_PASS_1_NEEDED || CC_CORE_PASS_2_NEEDED
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help
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Extra flags to pass onto ./configure when configuring the core gcc.
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The core gcc is a stripped down, C-only compiler needed to build
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the C library. Kinda bootstrap gcc, if you wish.
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You can enter multiple arguments here, and arguments can contain spaces
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if they are properly quoted (or escaped, but prefer quotes). Eg.:
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--with-foo="1st arg with 4 spaces" --with-bar=2nd-arg-without-space
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config CC_GCC_EXTRA_CONFIG_ARRAY
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string
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prompt "gcc extra config"
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default ""
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help
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Extra flags to pass onto ./configure when configuring gcc.
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You can enter multiple arguments here, and arguments can contain spaces
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if they are properly quoted (or escaped, but prefer quotes). Eg.:
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--with-foo="1st arg with 4 spaces" --with-bar=2nd-arg-without-space
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config CC_GCC_MULTILIB_LIST
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string
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prompt "List of multilib variants"
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depends on MULTILIB
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help
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Architecture-specific option of expanding or restricting the list of
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the multilib variants to be built. Refer to GCC installation manual
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for the format of this option for a particular architecture.
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Leave empty to use the default list for this architecture.
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config STATIC_TOOLCHAIN
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bool
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select CC_GCC_STATIC_LIBSTDCXX
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config CC_GCC_STATIC_LIBSTDCXX
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bool
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prompt "Link libstdc++ statically into the gcc binary"
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default y
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depends on CONFIGURE_has_static_link || CANADIAN || CROSS_NATIVE
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select WANTS_STATIC_LINK if CROSS || NATIVE
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select WANTS_STATIC_LINK_CXX if CROSS || NATIVE
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help
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Newer gcc versions require some c++ libraries. So statically
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linking libstdc++ increases the likeliness that the gcc binary will
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run on machines other than the one which it was built on, without
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having to worry about distributing the matching version of libstdc++
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along with it.
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config CC_GCC_SYSTEM_ZLIB
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bool
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prompt "Use system zlib"
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help
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Do not use bundled zlib, and use the zlib already available for
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the host (eg. the system library).
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If zlib is built as a companion library, selecting this option
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will use it.
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If you want to build a static toolchain, you will need to also
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install the static version of zlib for your host.
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If unsure, say 'n'.
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config CC_GCC_CONFIG_TLS
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tristate
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prompt "Configure TLS (Thread Local Storage)"
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depends on !LIBC_bionic
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default m
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help
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Specify that the target supports TLS (Thread Local Storage). Usually
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configure can correctly determine if TLS is supported. In cases where
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it guesses incorrectly, TLS can be explicitly enabled or disabled.
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This can happen if the assembler supports TLS but the C library does
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not, or if the assumptions made by the configure test are incorrect.
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Option | TLS use | Associated ./configure switch
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---------+--------------------+--------------------------------
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Y | forcibly used | --enable-tls
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M | auto | (none, ./configure decides)
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N | forcibly not used | --disable-tls
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If unsure, say 'M'.
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#-----------------------------------------------------------------------------
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# Optimisation features
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comment "Optimisation features"
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# Defined in config/cc/gcc.in
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# For graphite: gcc needs cloog and isl
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# In >= gcc-5.x, cloog is no longer needed, but isl is.
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# Prompt in config/cc/gcc.in.2
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config CC_GCC_USE_GRAPHITE
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bool "Enable GRAPHITE loop optimisations"
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default y
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select CLOOG_NEEDED if !CC_GCC_5_or_later
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select ISL_NEEDED
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help
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Enable the GRAPHITE loop optimsations.
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On some systems (eg. Cygwin), CLooG and ISL (required to enable
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GRAPHITE) may not build properly (yet), so you'll have to say 'N'
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here (or help debug the issues)
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TODO: Is this still true on Cygwin?
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# The way LTO works is a bit twisted.
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# See: http://gcc.gnu.org/wiki/LinkTimeOptimization#Requirements
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# Basically:
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# - if binutils has plugins: LTO is handled by ld/gold by loading
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# the plugin when linking
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# - if binutils does not have plugins: LTO is handled by collect2
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# In any case, LTO support does not depend on plugins, but takes
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# advantage of it
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config CC_GCC_USE_LTO
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bool "Enable LTO"
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default y
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depends on ! STATIC_TOOLCHAIN
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help
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Enable the Link Time Optimisations.
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#-----------------------------------------------------------------------------
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comment "Settings for libraries running on target"
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config CC_GCC_ENABLE_TARGET_OPTSPACE
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bool
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prompt "Optimize gcc libs for size"
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default y
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help
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Pass --enable-target-optspace to crossgcc's configure.
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This will compile crossgcc's libs with -Os.
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config CC_GCC_LIBMUDFLAP
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bool
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prompt "Compile libmudflap"
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help
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libmudflap is a pointer-use checking tool, which can detect
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various mis-usages of pointers in C and (to some extents) C++.
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You should say 'N' here, as libmduflap generates instrumented
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code (thus it is a bit bigger and a bit slower) and requires
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re-compilation and re-link, while it exists better run-time
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alternatives (eg. DUMA, dmalloc...) that need neither re-
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compilation nor re-link.
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config CC_GCC_LIBGOMP
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bool
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prompt "Compile libgomp"
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depends on !THREADS_NONE
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help
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libgomp is "the GNU implementation of the OpenMP Application Programming
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Interface (API) for multi-platform shared-memory parallel programming in
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C/C++ and Fortran". See:
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http://gcc.gnu.org/onlinedocs/libgomp/
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GNU OpenMP support requires threading.
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The default is 'N'. Say 'Y' if you need it, and report success/failure.
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config CC_GCC_LIBSSP
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bool
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prompt "Compile libssp"
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help
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libssp is the run-time Stack-Smashing Protection library.
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The default is 'N'. Say 'Y' if you need it, and report success/failure.
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config CC_GCC_LIBQUADMATH
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bool
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prompt "Compile libquadmath"
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help
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libquadmath is a library which provides quad-precision mathematical
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functions on targets supporting the __float128 datatype. See:
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http://gcc.gnu.org/onlinedocs/libquadmath/
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The default is 'N'. Say 'Y' if you need it, and report success/failure.
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config CC_GCC_LIBSANITIZER
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bool
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prompt "Compile libsanitizer"
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depends on THREADS_NATIVE
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depends on ! LIBC_uClibc && ! LIBC_musl # Currently lacks required headers (like netrom.h)
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help
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libsanitizer is a library which provides run-time sanitising of either
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or both of:
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- memory access patterns (out-of-bonds, use-after-free)
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- racy data accesses (in multi-threaded programs)
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The default is 'N'. Say 'Y' if you need it, and report success/failure.
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config CC_GCC_LIBMPX
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bool
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default y
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prompt "Compile libmpx"
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depends on CC_GCC_HAS_LIBMPX
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depends on ARCH_x86
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# MUSL does not define libc types that GCC requires. Mingw lacks certain headers.
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depends on !LIBC_musl && ! LIBC_mingw
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help
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Enable GCC support for Intel Memory Protection Extensions (MPX).
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#-----------------------------------------------------------------------------
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comment "Misc. obscure options."
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config CC_CXA_ATEXIT
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bool
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prompt "Use __cxa_atexit"
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default y
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depends on ! BARE_METAL || LIBC_PROVIDES_CXA_ATEXIT
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help
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If you get the missing symbol "__cxa_atexit" when building C++ programs,
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you might want to try disabling this option.
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config CC_GCC_DISABLE_PCH
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bool
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prompt "Do not build PCH"
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help
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Say 'y' here to not use Pre-Compiled Headers in the resulting toolchain.
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at the expense of speed when compiling C++ code.
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For some configurations (most notably canadian?), PCH are broken, and
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need to be disabled. Please see:
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40974
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config CC_GCC_SJLJ_EXCEPTIONS
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tristate
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prompt "Use sjlj for exceptions"
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depends on ! BARE_METAL
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default m
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help
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'sjlj' is short for setjmp/longjmp.
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On some architectures, stack unwinding during exception handling
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works perfectly well without using sjlj, while on some others,
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use of sjlj is required for proper stack unwinding.
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Option | sjlj use | Associated ./configure switch
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---------+--------------------+--------------------------------
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Y | forcibly used | --enable-sjlj-exceptions
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M | auto | (none, ./configure decides)
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N | forcibly not used | --disable-sjlj-exceptions
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It should be safe to say 'M' or 'N'.
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It can happen that ./configure is wrong in some cases. Known
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case is for ARM big endian, where you should say 'N'.
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config CC_GCC_LDBL_128
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tristate
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prompt "Enable 128-bit long doubles"
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default m
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help
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Saying 'Y' will force gcc to use 128-bit wide long doubles
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Saying 'N' will force gcc to use 64-bit wide long doubles
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Saying 'M' will let gcc choose (default is 128-bit for
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glibc >= 2.4, 64-bit otherwise)
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If in doubt, keep the default, ie. 'M'.
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config CC_GCC_BUILD_ID
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bool
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prompt "Enable build-id"
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help
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Tells GCC to pass --build-id option to the linker for all final
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links (links performed without the -r or --relocatable option),
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if the linker supports it. If you say 'y' here, but your linker
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does not support --build-id option, a warning is issued and this
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option is ignored.
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The default is off.
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choice CC_GCC_LNK_HASH_STYLE_CHOICE
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bool
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prompt "linker hash style"
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depends on BINUTILS_HAS_HASH_STYLE
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config CC_GCC_LNK_HASH_STYLE_DEFAULT
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bool
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prompt "Default"
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help
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Do not specify any value, and use the default value (sysv).
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config CC_GCC_LNK_HASH_STYLE_SYSV
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bool
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prompt "sysv"
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help
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Force use of the SYSV hash style.
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config CC_GCC_LNK_HASH_STYLE_GNU
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bool
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prompt "gnu"
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help
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Force use of the GNU hash style.
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config CC_GCC_LNK_HASH_STYLE_BOTH
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bool
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prompt "both"
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help
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Force use of both hash styles.
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endchoice # CC_GCC_LNK_HASH_STYLE_CHOICE
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config CC_GCC_LNK_HASH_STYLE
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string
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default "" if CC_GCC_LNK_HASH_STYLE_DEFAULT
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default "sysv" if CC_GCC_LNK_HASH_STYLE_SYSV
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default "gnu" if CC_GCC_LNK_HASH_STYLE_GNU
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default "both" if CC_GCC_LNK_HASH_STYLE_BOTH
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choice CC_GCC_DEC_FLOATS_CHOICE
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bool "Decimal floats"
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default CC_GCC_DEC_FLOATS_AUTO
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help
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Choose what type of decimal floats to support.
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Note that using decimal floats requires a C library that provides
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support for fenv (namely, the fenv.h header). This is the case
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for (e)glibc, and uClibc on x86/32. For other C libraries, or
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uClibc on other archs, this might not be the case, so you should
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disable support for decimal floats.
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The default is to let ./configure decide.
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config CC_GCC_DEC_FLOAT_AUTO
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bool "auto"
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help
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Let ./configure decide. If you say 'y' here, gcc will default to:
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- 'bid' for x86 (32- and 64-bit)
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- 'dpd' for powerpc
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- 'no' for the other architectures
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config CC_GCC_DEC_FLOAT_BID
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bool "bid"
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help
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Use the 'binary integer decimal' format for decimal floats.
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config CC_GCC_DEC_FLOAT_DPD
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bool "dpd"
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help
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Use the 'densely packed decimal' for decimal floats.
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config CC_GCC_DEC_FLOATS_NO
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bool "no"
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help
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Do not support decimal floats. The default.
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endchoice # CC_GCC_DEC_FLOATS_CHOICE
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config CC_GCC_DEC_FLOATS
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string
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default "" if CC_GCC_DEC_FLOATS_AUTO
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default "bid" if CC_GCC_DEC_FLOATS_BID
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default "dpd" if CC_GCC_DEC_FLOATS_DPD
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default "no" if CC_GCC_DEC_FLOATS_NO
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#-----------------------------------------------------------------------------
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config CC_GCC_HAS_ARCH_OPTIONS
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bool
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comment "archictecture-specific options"
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depends on CC_GCC_HAS_ARCH_OPTIONS
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if ARCH_mips
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source "config/cc/gcc.in.mips"
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endif # ARCH_mips
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