Introduce a new EXPERIMENTAL feature: BARE_METAL.

This should ultimately llow to build bare-metal compilers, for targets that have no kernel and no C library.
Move the C library build script to their own sub-directory; introduce an empty build script for bare-metal.
Move the compiler build script to its own sub-directory.
Move the kernel build script to its own sub-directory; introduce an empty build script for bare-metal.
Update the ARM target tuples to enable bare-metal targets.
Add two ARM bare-metal samples.
Add latest Linux kernel versions.

 /trunk/scripts/build/kernel/none.sh              |   77     6    71     0 +----
 /trunk/scripts/build/cc/gcc.sh                   |   58    41    17     0 ++-
 /trunk/scripts/build/libc/none.sh                |  513     9   504     0 +-----------------------------
 /trunk/scripts/crosstool.sh                      |   17     9     8     0 +
 /trunk/scripts/functions                         |    6     4     2     0 +
 /trunk/scripts/showSamples.sh                    |    6     3     3     0
 /trunk/samples/arm-unknown-elf/crosstool.config  |  225   225     0     0 +++++++++++++
 /trunk/samples/arm-unknown-eabi/crosstool.config |  223   223     0     0 +++++++++++++
 /trunk/config/kernel/linux_headers_install.in    |   64    27    37     0 ++--
 /trunk/config/kernel.in                          |    9     8     1     0 +
 /trunk/config/toolchain.in                       |    1     1     0     0 +
 /trunk/config/cc/gcc.in                          |    3     3     0     0 +
 /trunk/config/debug/dmalloc.in                   |    1     1     0     0 +
 /trunk/config/debug/gdb.in                       |    4     3     1     0 +
 /trunk/config/debug/strace.in                    |    1     1     0     0 +
 /trunk/config/debug/duma.in                      |    1     1     0     0 +
 /trunk/config/cc.in                              |    8     8     0     0 +
 /trunk/config/target.in                          |   13    13     0     0 +
 /trunk/config/binutils.in                        |    1     1     0     0 +
 /trunk/config/gmp_mpfr.in                        |    1     1     0     0 +
 /trunk/config/libc.in                            |   17    11     6     0 +
 /trunk/arch/arm/functions                        |    3     1     2     0 -
 22 files changed, 600 insertions(+), 652 deletions(-)

13 files changed, 79 insertions, 45 deletions

diff --git a/config/binutils.in b/config/binutils.in
index a83b50c7..a3eb211f 100644
--- a/config/binutils.in
+++ b/config/binutils.in
@@ -79,6 +79,7 @@ config BINUTILS_EXTRA_CONFIG
 config BINUTILS_FOR_TARGET
     bool
     prompt "binutils libraries for the target"
+    depends on ! BARE_METAL
     default n
     help
       Some utilities may need binutils libraries to be available on
diff --git a/config/cc.in b/config/cc.in
index 1ad692eb..a88832ea 100644
--- a/config/cc.in
+++ b/config/cc.in
@@ -53,6 +53,8 @@ config CC_SUPPORT_OBJC
 config CC_SUPPORT_OBJCXX
     bool
 
+if ! BARE_METAL
+
 comment "Additional supported languages:"
 
 config CC_LANG_CXX
@@ -136,4 +138,10 @@ config CC_LANG_OTHERS
       Eg. gcc-4.1+ has a toy programming language, treelang. As it is not usefull
       in real life, it is not available in the selection above.
 
+endif # ! BARE_METAL
+
+if BARE_METAL
+comment "Only C language supported on bare metal"
+endif # BARE_METAL
+
 endmenu
diff --git a/config/cc/gcc.in b/config/cc/gcc.in
index 02d1879f..64d27cb3 100644
--- a/config/cc/gcc.in
+++ b/config/cc/gcc.in
@@ -130,6 +130,7 @@ config CC_CXA_ATEXIT
     bool
     prompt "Use __cxa_atexit"
     default y
+    depends on ! BARE_METAL
     help
       If you get the missing symbol "__cxa_atexit" when building C++ programs,
       you might want to try disabling this option.
@@ -138,6 +139,7 @@ choice
     bool
     prompt "Use sjlj for exceptions"
     default CC_SJLJ_EXCEPTIONS_CONFIGURE
+    depends on ! BARE_METAL
 
 # This config option is used nowhere in the code on purpose.
 # It only serves as a choice entry to force neither using nor not using sjlj
@@ -185,6 +187,7 @@ config CC_EXTRA_CONFIG
     string
     prompt "gcc extra config"
     default ""
+    depends on ! BARE_METAL
     help
       Extra flags to pass onto ./configure when configuring gcc.
 
diff --git a/config/debug/dmalloc.in b/config/debug/dmalloc.in
index 8a53c71a..692c2292 100644
--- a/config/debug/dmalloc.in
+++ b/config/debug/dmalloc.in
@@ -4,6 +4,7 @@ menuconfig DMALLOC
     bool
     prompt "dmalloc"
     default n
+    depends on ! BARE_METAL
 
 if DMALLOC
 
diff --git a/config/debug/duma.in b/config/debug/duma.in
index 16f3d2a3..5de4e7c0 100644
--- a/config/debug/duma.in
+++ b/config/debug/duma.in
@@ -4,6 +4,7 @@ menuconfig DUMA
     bool
     prompt "D.U.M.A."
     default n
+    depends on ! BARE_METAL
     help
       D.U.M.A. - Detect Unintended Memory Access
       A memory bound checker, with additional features.
diff --git a/config/debug/gdb.in b/config/debug/gdb.in
index 43239ac2..b65a71b2 100644
--- a/config/debug/gdb.in
+++ b/config/debug/gdb.in
@@ -13,7 +13,7 @@ config GDB_CROSS
     bool
     prompt "Cross-gdb"
     default y
-    select GDB_GDBSERVER
+    select GDB_GDBSERVER if ! BARE_METAL
     help
       Build and install a cross-gdb for the target, to run on host.
 
@@ -45,6 +45,7 @@ config GDB_NATIVE
     bool
     prompt "Native gdb"
     default n
+    depends on ! BARE_METAL
     help
       Build and install a native gdb for the target, to run on the target.
 
@@ -78,6 +79,7 @@ config GDB_GDBSERVER
     bool
     prompt "gdbserver"
     default n
+    depends on ! BARE_METAL
     help
       Build and install a gdbserver for the target, to run on the target.
 
diff --git a/config/debug/strace.in b/config/debug/strace.in
index 234556ae..055bb222 100644
--- a/config/debug/strace.in
+++ b/config/debug/strace.in
@@ -4,6 +4,7 @@ menuconfig STRACE
     bool
     prompt "strace"
     default n
+    depends on ! BARE_METAL
 
 if STRACE
 
diff --git a/config/gmp_mpfr.in b/config/gmp_mpfr.in
index c384ecc5..02afb769 100644
--- a/config/gmp_mpfr.in
+++ b/config/gmp_mpfr.in
@@ -20,6 +20,7 @@ config GMP_MPFR_TARGET
     bool
     prompt "Build libraries for the target"
     depends on GMP_MPFR
+    depends on ! BARE_METAL
     default n
     help
       Also build libraries for the target. This can be usefull if you want
diff --git a/config/kernel.in b/config/kernel.in
index 607917de..f46a937f 100644
--- a/config/kernel.in
+++ b/config/kernel.in
@@ -1,11 +1,16 @@
 # Kernel options
 
-menu "Kernel"
+
 
 config KERNEL
     string
+    default "none"  if BARE_METAL
     default "linux" if KERNEL_LINUX
 
+if ! BARE_METAL
+
+menu "Kernel"
+
 choice
     bool
     prompt "Target OS"
@@ -27,3 +32,5 @@ source config/kernel/linux.in
 endif
 
 endmenu
+
+endif # ! BARE_METAL
diff --git a/config/kernel/linux_headers_install.in b/config/kernel/linux_headers_install.in
index db7af991..fc3df3fb 100644
--- a/config/kernel/linux_headers_install.in
+++ b/config/kernel/linux_headers_install.in
@@ -32,44 +32,10 @@ config KERNEL_INSTALL_V_2_6_23_17
     prompt "2.6.23.17 (OBSOLETE)"
     depends on KERNEL_VERSION_SEE_EXTRAVERSION && OBSOLETE
 
-config KERNEL_INSTALL_V_2_6_24
-    bool
-    prompt "2.6.24"
-
-config KERNEL_INSTALL_V_2_6_24_1
-    bool
-    prompt "2.6.24.1"
-    depends on KERNEL_VERSION_SEE_EXTRAVERSION
-
-config KERNEL_INSTALL_V_2_6_24_2
-    bool
-    prompt "2.6.24.2"
-    depends on KERNEL_VERSION_SEE_EXTRAVERSION
-
-config KERNEL_INSTALL_V_2_6_24_3
-    bool
-    prompt "2.6.24.3"
-    depends on KERNEL_VERSION_SEE_EXTRAVERSION
-
-config KERNEL_INSTALL_V_2_6_24_4
-    bool
-    prompt "2.6.24.4"
-    depends on KERNEL_VERSION_SEE_EXTRAVERSION
-
-config KERNEL_INSTALL_V_2_6_24_5
-    bool
-    prompt "2.6.24.5"
-    depends on KERNEL_VERSION_SEE_EXTRAVERSION
-
-config KERNEL_INSTALL_V_2_6_24_6
-    bool
-    prompt "2.6.24.6"
-    depends on KERNEL_VERSION_SEE_EXTRAVERSION
-
 config KERNEL_INSTALL_V_2_6_24_7
     bool
-    prompt "2.6.24.7"
-    depends on KERNEL_VERSION_SEE_EXTRAVERSION
+    prompt "2.6.24.7 (OBSOLETE)"
+    depends on KERNEL_VERSION_SEE_EXTRAVERSION && OBSOLETE
 
 config KERNEL_INSTALL_V_2_6_25
     bool
@@ -150,6 +116,16 @@ config KERNEL_INSTALL_V_2_6_25_15
     prompt "2.6.25.15"
     depends on KERNEL_VERSION_SEE_EXTRAVERSION
 
+config KERNEL_INSTALL_V_2_6_25_16
+    bool
+    prompt "2.6.25.16"
+    depends on KERNEL_VERSION_SEE_EXTRAVERSION
+
+config KERNEL_INSTALL_V_2_6_25_17
+    bool
+    prompt "2.6.25.17"
+    depends on KERNEL_VERSION_SEE_EXTRAVERSION
+
 config KERNEL_INSTALL_V_2_6_26
     bool
     prompt "2.6.26"
@@ -169,6 +145,16 @@ config KERNEL_INSTALL_V_2_6_26_3
     prompt "2.6.26.3"
     depends on KERNEL_VERSION_SEE_EXTRAVERSION
 
+config KERNEL_INSTALL_V_2_6_26_4
+    bool
+    prompt "2.6.26.4"
+    depends on KERNEL_VERSION_SEE_EXTRAVERSION
+
+config KERNEL_INSTALL_V_2_6_26_5
+    bool
+    prompt "2.6.26.5"
+    depends on KERNEL_VERSION_SEE_EXTRAVERSION
+
 # CT_INSERT_VERSION_ABOVE
 # Don't remove above line!
 endchoice
@@ -204,11 +190,15 @@ config KERNEL_VERSION
     default "2.6.25.12" if KERNEL_INSTALL_V_2_6_25_12
     default "2.6.25.13" if KERNEL_INSTALL_V_2_6_25_13
     default "2.6.25.14" if KERNEL_INSTALL_V_2_6_25_14
-    default "2.6.25.15" if KERNEL_INSTALL_V_2_6_25_15
+    default "2.6.25.14" if KERNEL_INSTALL_V_2_6_25_15
+    default "2.6.25.15" if KERNEL_INSTALL_V_2_6_25_16
+    default "2.6.25.15" if KERNEL_INSTALL_V_2_6_25_17
     default "2.6.26" if KERNEL_INSTALL_V_2_6_26
     default "2.6.26.1" if KERNEL_INSTALL_V_2_6_26_1
     default "2.6.26.2" if KERNEL_INSTALL_V_2_6_26_2
     default "2.6.26.3" if KERNEL_INSTALL_V_2_6_26_3
+    default "2.6.26.4" if KERNEL_INSTALL_V_2_6_26_4
+    default "2.6.26.5" if KERNEL_INSTALL_V_2_6_26_5
 # CT_INSERT_VERSION_STRING_ABOVE
 # Don't remove above line!
 
diff --git a/config/libc.in b/config/libc.in
index a8cf28ce..d5647520 100644
--- a/config/libc.in
+++ b/config/libc.in
@@ -1,5 +1,14 @@
 # C library options
 
+config LIBC
+    string
+    default "none"   if BARE_METAL
+    default "glibc"  if LIBC_GLIBC
+    default "eglibc" if LIBC_EGLIBC
+    default "uClibc" if LIBC_UCLIBC
+
+if ! BARE_METAL
+
 menu "C-library"
 
 choice
@@ -49,12 +58,6 @@ endchoice
 config LIBC_VERSION
     string
 
-config LIBC
-    string
-    default "glibc" if LIBC_GLIBC
-    default "eglibc" if LIBC_EGLIBC
-    default "uClibc" if LIBC_UCLIBC
-
 config LIBC_SUPPORT_NPTL
     bool
     default n
@@ -106,3 +109,5 @@ config LIBC_VERSION
       have to save your C library tarball by yourself.
 
 endmenu
+
+endif # ! BARE_METAL
diff --git a/config/target.in b/config/target.in
index b5c7af12..bd7b725b 100644
--- a/config/target.in
+++ b/config/target.in
@@ -28,6 +28,19 @@ config TARGET_LDFLAGS
 
 comment "General target options"
 
+config BARE_METAL
+    bool
+    prompt "Bare metal (EXPERIMENTAL)"
+    default n
+    depends on EXPERIMENTAL
+    help
+      Say 'y' here if you want a simple C compiler with no C library.
+
+      You probably want to say 'y' here if you plan to use your compiler
+      to build only kernels or bootloaders
+
+      'Bare metal' also refer to those programs that run without any kernel.
+
 choice
     bool
     prompt "Target architecture:"
diff --git a/config/toolchain.in b/config/toolchain.in
index db4f1526..4078a29a 100644
--- a/config/toolchain.in
+++ b/config/toolchain.in
@@ -15,6 +15,7 @@ config USE_SYSROOT
 config SHARED_LIBS
     bool
     prompt "Build shared libraries"
+    depends on ! BARE_METAL
     default y
     help
       Say 'y' here, unless you don't want shared libraries.