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avr-libc: add support for avr-libc C library

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This commit adds support for the avr-libc C library.
According to the project page at http://www.nongnu.org/avr-libc , the
avr-libc package provides a subset of the standard C library for Atmel
AVR 8-bit RISC microcontrollers. In addition, the library provides the
basic startup code needed by most applications.

Support for this library in crosstool-ng is only enabled for the AVR
8-bit target.

The avr-libc manual and most distributions build the AVR 8-bit gcc
toolchain with the "avr" (non-canonical) target.
Some experimentation also led to the conclusion that other (canonical)
targets are not very well supported, so we force the "avr" target for
crosstool-ng as well.

The manual also recommends building avr-libc after the final gcc build.
To accomplish this with crosstool-ng, a new do_libc_post_cc step is
added, in which currently only avr-libc performs its build, and is a
no-op for the other libc options.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
This commit is contained in:
Erico Nunes
2015-06-21 20:53:06 -03:00
parent 230dc12285
commit b8e64a0c08
12 changed files with 165 additions and 1 deletions
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10
scripts/functions
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@ -1206,6 +1206,11 @@ CT_DoBuildTargetTuple() {
*glibc) CT_TARGET_SYS=gnu;;
uClibc) CT_TARGET_SYS=uclibc;;
musl) CT_TARGET_SYS=musl;;
avr-libc)
# avr-libc only seems to work with the non-canonical "avr" target.
CT_TARGET_SKIP_CONFIG_SUB=y
CT_TARGET_SYS= # CT_TARGET_SYS must be empty too
;;
*) CT_TARGET_SYS=elf;;
esac
@ -1259,7 +1264,10 @@ CT_DoBuildTargetTuple() {
esac
# Canonicalise it
CT_TARGET=$(CT_DoConfigSub "${CT_TARGET}")
if [ "${CT_TARGET_SKIP_CONFIG_SUB}" != "y" ]; then
CT_TARGET=$(CT_DoConfigSub "${CT_TARGET}")
fi
# Prepare the target CFLAGS
CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_ENDIAN_CFLAG}"
CT_ARCH_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_ARCH_ARCH_CFLAG}"