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#
# For a description of the syntax of this configuration file,
# see extra/config/Kconfig-language.txt
#
#
# Binary format
#
if !ARCH_USE_MMU
choice
prompt "Target File Format"
config UCLIBC_FORMAT_ELF
bool "ELF (using ELF_FDPIC loader)"
depends on !ARCH_USE_MMU && (TARGET_arm || TARGET_m68k || \
TARGET_riscv32 || TARGET_riscv64)
select DOPIC
select STATIC_PIE
select ARCH_HAS_NO_SHARED
select HAVE_LDSO
config UCLIBC_FORMAT_FDPIC_ELF
bool "FDPIC ELF"
depends on !ARCH_USE_MMU && (TARGET_bfin || TARGET_frv || TARGET_arm || TARGET_xtensa)
select DOPIC
config UCLIBC_FORMAT_DSBT_ELF
bool "DBST ELF"
depends on !ARCH_USE_MMU && TARGET_c6x
select DOPIC
config UCLIBC_FORMAT_FLAT
bool "STATIC FLAT"
depends on !ARCH_USE_MMU && !TARGET_frv
select ARCH_HAS_NO_LDSO
config UCLIBC_FORMAT_FLAT_SEP_DATA
bool "STATIC FLAT (sep-data)"
depends on !ARCH_USE_MMU && !TARGET_frv
select ARCH_HAS_NO_LDSO
endchoice
endif
if ARCH_USE_MMU
comment "Using ELF file format"
endif
config ARCH_HAS_DEPRECATED_SYSCALLS
bool
help
New architectures do not support deprecated system calls. However,
these system calls are needed to build linuxthreads so
this symbol controls whether there is support for these threading libraries
or not.
#
# Endian Format
#
config ARCH_ANY_ENDIAN
bool
config ARCH_BIG_ENDIAN
bool
config ARCH_LITTLE_ENDIAN
bool
if ARCH_ANY_ENDIAN
choice
prompt "Target Processor Endianness"
help
This is the endianness you wish to use. Choose either Big
Endian, or Little Endian.
config ARCH_WANTS_BIG_ENDIAN
bool "Big Endian"
select ARCH_BIG_ENDIAN
config ARCH_WANTS_LITTLE_ENDIAN
bool "Little Endian"
select ARCH_LITTLE_ENDIAN
endchoice
endif
# if the arch only supports one endian, just display the setting
if !ARCH_ANY_ENDIAN && ARCH_LITTLE_ENDIAN
comment "Using Little Endian"
endif
if !ARCH_ANY_ENDIAN && ARCH_BIG_ENDIAN
comment "Using Big Endian"
endif
config ARCH_HAS_NO_MMU
bool
if ARCH_HAS_NO_MMU
comment "Target CPU lacks a memory management unit (MMU)"
endif
config ARCH_HAS_MMU
bool "Target CPU has a memory management unit (MMU)"
depends on !ARCH_HAS_NO_MMU
default y
help
If your target CPU does not have a memory management unit (MMU),
then answer N here. Normally, Linux runs on systems with an MMU.
If you are building a uClinux system, answer N.
Most people will answer Y.
config ARCH_USE_MMU
bool "Do you want to utilize the MMU?"
depends on ARCH_HAS_MMU
default y
help
If your target CPU has a MMU, and you wish to actually utilize it,
then answer Y here. Normal Linux requires an MMU.
If you're unsure, answer Y.
config UCLIBC_HAS_FLOATS
bool "Enable floating point number support"
default y
help
This option allows you to entirely omit all floating point number
support from uClibc. This will cause floating point functions like
strtod() to be omitted from uClibc. Other floating point functions,
such as printf() and scanf() will still be included in the library,
but will not contain support for floating point numbers.
Answering N to this option can reduce the size of uClibc.
Most people will answer Y.
config UCLIBC_HAS_FPU
bool "Target CPU has a floating point unit (FPU)"
default y
help
If your target CPU does not have a Floating Point Unit (FPU) or a
kernel FPU emulator, but you still wish to support floating point
functions, then uClibc will need to be compiled with soft floating
point support (-msoft-float). If your target CPU does not have an
FPU or an FPU emulator within the Linux kernel, then you should
answer N.
Most people will answer Y.
config UCLIBC_HAS_SOFT_FLOAT
bool
depends on UCLIBC_HAS_FLOATS && !UCLIBC_HAS_FPU
default y
config DO_C99_MATH
bool "Enable full C99 math library support"
depends on UCLIBC_HAS_FLOATS
help
If you want the uClibc math library to contain the full set C99
math library features, then answer Y. If you leave this set to
N the math library will contain only the math functions that were
listed as part of the traditional POSIX/IEEE 1003.1b-1993 standard.
Leaving this option set to N will save around 35k on an x86 system.
If your applications require the newer C99 math library functions,
then answer Y.
config DO_XSI_MATH
bool "Enable XSI math extensions to the ISO C standard (bessel)"
depends on UCLIBC_HAS_FLOATS
help
X/Open System Interfaces extensions to ISO C math functions
(differential equation functions):
j0, j1, jn - Bessel functions of the first kind
y0, y1, yn - Bessel functions of the second kind
config UCLIBC_HAS_FENV
bool "Enable C99 Floating-point environment"
depends on UCLIBC_HAS_FLOATS
depends on TARGET_i386 || \
TARGET_metag || \
TARGET_nds32 || \
(TARGET_powerpc && CONFIG_E500) || \
TARGET_x86_64
help
If you want the uClibc math library to contain the C99 floating
point environment, rounding and exception handling functions then
say Y here.
config UCLIBC_HAS_LONG_DOUBLE_MATH
bool "Enable long double support"
depends on DO_C99_MATH
default y
help
If you want the uClibc math library to contain the full set of C99
long double math library features, then answer Y.
Danger: These are only wrappers to the double library functions!
config KERNEL_HEADERS
string "Linux kernel header location"
default ""
help
The kernel source you use to compile with should be the same
as the Linux kernel you run your apps on. uClibc doesn't even
try to achieve binary compatibility across kernel versions.
So don't expect, for example, uClibc compiled with Linux kernel
2.0.x to implement lchown properly, since 2.0.x can't do that.
Similarly, if you compile uClibc vs Linux 2.4.x kernel headers,
but then run on Linux 2.0.x, lchown will be compiled into uClibc,
but won't work at all. You have been warned.
If you don't set this, we'll assume the toolchain can find them.
config UCLIBC_UCLINUX_BROKEN_MUNMAP
bool
depends on !ARCH_USE_MMU
default y
config HAVE_DOT_CONFIG
bool
default y
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