Remove make preinstall

A speciality of the RTEMS build system was the make preinstall step.  It
copied header files from arbitrary locations into the build tree.  The
header files were included via the -Bsome/build/tree/path GCC command
line option.

This has at least seven problems:

* The make preinstall step itself needs time and disk space.

* Errors in header files show up in the build tree copy.  This makes it
  hard for editors to open the right file to fix the error.

* There is no clear relationship between source and build tree header
  files.  This makes an audit of the build process difficult.

* The visibility of all header files in the build tree makes it
  difficult to enforce API barriers.  For example it is discouraged to
  use BSP-specifics in the cpukit.

* An introduction of a new build system is difficult.

* Include paths specified by the -B option are system headers.  This
  may suppress warnings.

* The parallel build had sporadic failures on some hosts.

This patch removes the make preinstall step.   All installed header
files are moved to dedicated include directories in the source tree.
Let @RTEMS_CPU@ be the target architecture, e.g. arm, powerpc, sparc,
etc.  Let @RTEMS_BSP_FAMILIY@ be a BSP family base directory, e.g.
erc32, imx, qoriq, etc.

The new cpukit include directories are:

* cpukit/include

* cpukit/score/cpu/@RTEMS_CPU@/include

* cpukit/libnetworking

The new BSP include directories are:

* bsps/include

* bsps/@RTEMS_CPU@/include

* bsps/@RTEMS_CPU@/@RTEMS_BSP_FAMILIY@/include

There are build tree include directories for generated files.

The include directory order favours the most general header file, e.g.
it is not possible to override general header files via the include path
order.

The "bootstrap -p" option was removed.  The new "bootstrap -H" option
should be used to regenerate the "headers.am" files.

Update #3254.

1 files changed, 63 insertions, 0 deletions

diff --git a/cpukit/include/rtems/ringbuf.h b/cpukit/include/rtems/ringbuf.h
new file mode 100644
index 0000000000..c16a79d1ae
--- /dev/null
+++ b/cpukit/include/rtems/ringbuf.h
@@ -0,0 +1,63 @@
+/**
+ * @file
+ *
+ * @brief Simple Ring Buffer Functionality
+ *
+ * This file provides simple ring buffer functionality.
+ */
+
+
+#ifndef _RTEMS_RINGBUF_H
+#define _RTEMS_RINGBUF_H
+
+#include <rtems.h>
+
+#ifndef RINGBUF_QUEUE_LENGTH
+#define RINGBUF_QUEUE_LENGTH 128
+#endif
+
+typedef struct {
+  uint8_t buffer[RINGBUF_QUEUE_LENGTH];
+  volatile int  head;
+  volatile int  tail;
+  rtems_interrupt_lock lock;
+} Ring_buffer_t;
+
+#define Ring_buffer_Initialize( _buffer ) \
+  do { \
+    (_buffer)->head = (_buffer)->tail = 0; \
+    rtems_interrupt_lock_initialize(&(_buffer)->lock, "ring buffer"); \
+  } while ( 0 )
+
+#define Ring_buffer_Destory( _buffer ) \
+  do { \
+    rtems_interrupt_lock_destroy(&(_buffer)->lock); \
+  } while ( 0 )
+
+#define Ring_buffer_Is_empty( _buffer ) \
+   ( (_buffer)->head == (_buffer)->tail )
+
+#define Ring_buffer_Is_full( _buffer ) \
+   ( (_buffer)->head == ((_buffer)->tail + 1) % RINGBUF_QUEUE_LENGTH )
+
+#define Ring_buffer_Add_character( _buffer, _ch ) \
+  do { \
+    rtems_interrupt_lock_context lock_context; \
+    \
+    rtems_interrupt_lock_acquire( &(_buffer)->lock, &lock_context ); \
+      (_buffer)->tail = ((_buffer)->tail+1) % RINGBUF_QUEUE_LENGTH; \
+      (_buffer)->buffer[ (_buffer)->tail ] = (_ch); \
+    rtems_interrupt_lock_release( &(_buffer)->lock, &lock_context ); \
+  } while ( 0 )
+
+#define Ring_buffer_Remove_character( _buffer, _ch ) \
+  do { \
+    rtems_interrupt_lock_context lock_context; \
+    \
+    rtems_interrupt_lock_acquire( &(_buffer)->lock, &lock_context ); \
+      (_buffer)->head = ((_buffer)->head+1) % RINGBUF_QUEUE_LENGTH; \
+      (_ch) = (_buffer)->buffer[ (_buffer)->head ]; \
+    rtems_interrupt_lock_release( &(_buffer)->lock, &lock_context ); \
+  } while ( 0 )
+
+#endif