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, 91 insertions, 0 deletions

diff --git a/bsps/arm/lpc176x/include/bsp/system-clocks.h b/bsps/arm/lpc176x/include/bsp/system-clocks.h
new file mode 100644
index 0000000000..26087ff3e9
--- /dev/null
+++ b/bsps/arm/lpc176x/include/bsp/system-clocks.h
@@ -0,0 +1,91 @@
+/**
+ * @file
+ *
+ * @ingroup lpc176x_clocks
+ *
+ * @brief System clocks.
+ */
+
+/*
+ * Copyright (c) 2008, 2009
+ * embedded brains GmbH
+ * Obere Lagerstr. 30
+ * D-82178 Puchheim
+ * Germany
+ * <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef LIBBSP_ARM_LPC176X_SYSTEM_CLOCKS_H
+#define LIBBSP_ARM_LPC176X_SYSTEM_CLOCKS_H
+
+#include <bsp/lpc176x.h>
+#include <bsp/timer-defs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * @defgroup lpc176x_clock System Clocks
+ *
+ * @ingroup lpc176x
+ *
+ * @brief System clocks.
+ *
+ * @{
+ */
+
+/**
+ * @brief Initializes the standard timer.
+ *
+ * This function uses Timer 1.
+ */
+void lpc176x_timer_initialize( void );
+
+/**
+ * @brief Returns current standard timer value in CPU clocks.
+ *
+ * @return This function uses Timer 1.
+ */
+static inline unsigned lpc176x_get_timer1( void )
+{
+  return LPC176X_T1TC;
+}
+
+/**
+ * @brief Delay for @a us micro seconds.
+ *
+ * This function uses the standard timer and assumes that the CPU
+ * frequency is in whole MHz numbers.  The delay value @a us will be
+ * converted to CPU ticks and there is no protection against integer
+ * overflows.
+ *
+ * This function uses Timer 1.
+ */
+void lpc176x_micro_seconds_delay( unsigned us );
+
+/**
+ * @brief Returns the PLL output clock frequency in [Hz].
+ *
+ * @return Returns zero in case of an unexpected PLL input frequency.
+ */
+unsigned lpc176x_pllclk( void );
+
+/**
+ * @brief Returns the CPU clock frequency in [Hz].
+ *
+ * @return Returns zero in case of an unexpected PLL input frequency.
+ */
+unsigned lpc176x_cclk( void );
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* LIBBSP_ARM_LPC176X_SYSTEM_CLOCKS_H */