libc/musl: add musl-libc support

This patch adds initial support for musl-libc.

Musl-libc versions currently supported:
* 1.0.3 (Stable)
* 1.1.3 (Previous Mainline)
* 1.1.4 (Mainline)

Futher improvements are needed.
* gcc-4.9.x has issues (Might be fixed in musl-1.1.4).
* Multilib support is needed.
* Checks to make sure paths are correct.
* Move to 2-step gcc build. 3-step build is not necessary.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
[yann.morin.1998@free.fr: removed the gcc musl patch, to be added later;
 removed dead code do_get_arch()]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

1 files changed, 49 insertions, 0 deletions

diff --git a/config/libc/musl.in b/config/libc/musl.in
new file mode 100644
index 0000000..7bab480
--- /dev/null
+++ b/config/libc/musl.in
@@ -0,0 +1,49 @@
+# musl options
+
+## depends on ! WINDOWS && ! BARE_METAL
+##
+## select LIBC_SUPPORT_THREADS_NATIVE
+## select CC_CORE_PASSES_NEEDED
+##
+## help Musl is a new standard library to power a new generation of Linux-based
+## help devices. musl is lightweight, fast, simple, free, and strives to be
+## help correct in the sense of standards-conformance and safety.
+
+config THREADS
+    default "musl"
+
+choice
+    bool
+    prompt "musl version"
+# Don't remove next line
+# CT_INSERT_VERSION_BELOW
+
+config LIBC_MUSL_V_1_1_4
+    bool
+    prompt "1.1.4 (Mainline)"
+    depends on EXPERIMENTAL
+
+config LIBC_MUSL_V_1_1_3
+    bool
+    prompt "1.1.3"
+    depends on EXPERIMENTAL
+
+config LIBC_MUSL_V_1_0_3
+    bool
+    prompt "1.0.3 (Stable)"
+
+config LIBC_MUSL_V_CUSTOM
+    bool
+    prompt "Custom musl"
+    depends on EXPERIMENTAL
+
+endchoice
+
+config LIBC_VERSION
+    string
+# Don't remove next line
+# CT_INSERT_VERSION_STRING_BELOW
+    default "1.1.4" if LIBC_MUSL_V_1_1_4
+    default "1.1.3" if LIBC_MUSL_V_1_1_3
+    default "1.0.3" if LIBC_MUSL_V_1_0_3
+    default "custom" if LIBC_MUSL_V_CUSTOM