From b8e64a0c08ea2c3b2940d8e7154970f0dc610ed5 Mon Sep 17 00:00:00 2001
From: Erico Nunes <nunes.erico@gmail.com>
Date: Sun, 21 Jun 2015 20:53:06 -0300
Subject: avr-libc: add support for avr-libc C library

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>
---
 config/libc/avr-libc.in   | 51 +++++++++++++++++++++++++++++++++++++++++++++++
 config/libc/avr-libc.in.2 |  8 ++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 config/libc/avr-libc.in
 create mode 100644 config/libc/avr-libc.in.2

(limited to 'config/libc')

diff --git a/config/libc/avr-libc.in b/config/libc/avr-libc.in
new file mode 100644
index 00000000..968ca6be
--- /dev/null
+++ b/config/libc/avr-libc.in
@@ -0,0 +1,51 @@
+# avr-libc options
+
+## depends on ARCH_avr
+## depends on ! LINUX && ! WINDOWS && BARE_METAL
+##
+## select LIBC_SUPPORT_THREADS_NONE
+##
+## help The AVR Libc package provides a subset of the standard C library for
+## help Atmel AVR 8-bit RISC microcontrollers. In addition, the library
+## help provides the basic startup code needed by most applications.
+
+choice
+    bool
+    prompt "avr-libc version"
+# Don't remove next line
+# CT_INSERT_VERSION_BELOW
+
+config LIBC_AVR_LIBC_V_1_8_1
+    bool
+    prompt "1.8.1"
+
+config LIBC_AVR_LIBC_V_1_8_0
+    bool
+    prompt "1.8.0"
+
+config LIBC_AVR_LIBC_CUSTOM
+    bool
+    prompt "Custom avr-libc"
+    depends on EXPERIMENTAL
+
+endchoice
+
+if LIBC_AVR_LIBC_CUSTOM
+
+config LIBC_AVR_LIBC_CUSTOM_LOCATION
+    string
+    prompt "Full path to custom avr-libc source"
+    default ""
+    help
+      Enter the path to the directory (or tarball) of your source for avr-libc,
+      or leave blank to use default CT_CUSTOM_LOCATION_ROOT_DIR/avr-libc
+
+endif # LIBC_AVR_LIBC_CUSTOM
+
+config LIBC_VERSION
+    string
+# Don't remove next line
+# CT_INSERT_VERSION_STRING_BELOW
+    default "1.8.1" if LIBC_AVR_LIBC_V_1_8_1
+    default "1.8.0" if LIBC_AVR_LIBC_V_1_8_0
+    default "custom" if LIBC_AVR_LIBC_CUSTOM
diff --git a/config/libc/avr-libc.in.2 b/config/libc/avr-libc.in.2
new file mode 100644
index 00000000..89a182fe
--- /dev/null
+++ b/config/libc/avr-libc.in.2
@@ -0,0 +1,8 @@
+# avr-libc second-part options
+
+config LIBC_AVR_LIBC_EXTRA_CONFIG_ARRAY
+    string
+    prompt "Extra config for avr-libc"
+    default ""
+    help
+      Extra flags to pass onto ./configure when configuring the avr-libc.
-- 
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