Fix #312, CMake cleanup

Do not clobber the CMAKE_C_FLAGS value as part of the OSAL build.
Instead, use target_compile_options and target_include_directories
as needed to set the compile options for specific targets.

This also creates a separate CMakeLists.txt file for each OS/BSP
implementation library rather than using aux_source_directory.
Each implementation-specific build can then set any additional
options as required for that platform.

Note that any entity needing to compile/link with OSAL should
now obtain the requisite compile flags and directories by querying
the INTERFACE_COMPILE_DEFINITIONS and INTERFACE_INCLUDE_DIRECTORIES
properties on the osal library target.

src/bsp/mcp750-vxworks/CMakeLists.txt

@@ -0,0 +1,31 @@
+######################################################################
+#
+# CMAKE build recipe for MCP750 Board Support Package (BSP)
+#
+######################################################################
+
+add_library(osal_mcp750-vxworks_impl OBJECT 
+	src/bsp_start.c
+	src/bsp_voltab.c
+)
+
+target_include_directories(osal_mcp750-vxworks_impl PUBLIC
+    $ENV{WIND_BASE}/target/h
+    $ENV{WIND_BASE}/target/h/wrn/coreip
+    $ENV{WIND_BASE}/target/config/mcp750
+)
+
+# NOTE: the __PPC__ and MCP750 macros are referenced in some system headers.
+# therefore all code compiled for this platform should always define these symbols.
+target_compile_definitions(osal_mcp750-vxworks_impl PUBLIC
+    "__PPC__"
+    "MCP750"
+)
+
+add_library(ut_bsp STATIC EXCLUDE_FROM_ALL
+	ut-src/bsp_ut.c
+	ut-src/bsp_ut_voltab.c
+)
+target_include_directories(ut_bsp PRIVATE ${UT_ASSERT_SOURCE_DIR}/inc)
+
+

src/bsp/mcp750-vxworks/build_options.cmake

@@ -0,0 +1,8 @@
+##########################################################################
+#
+# Build options for "mcp750-vxworks" BSP
+#
+##########################################################################
+
+# This indicates where to stage target binaries created during the build
+set(OSAL_BSP_STAGING_INSTALL_DIR "CF:0")

src/bsp/pc-linux/CMakeLists.txt

@@ -0,0 +1,40 @@
+######################################################################
+#
+# CMAKE build recipe for PC-LINUX Board Support Package (BSP)
+#
+######################################################################
+
+# NOTE: Although this is traditionally called "pc-linux", it is generic
+# enough to be applied to non-PC systems running embedded Linux, such
+# as Raspberry Pi, BeagleBoard, Zync, or custom hardware.
+
+add_library(osal_pc-linux_impl OBJECT 
+	src/bsp_start.c
+	src/bsp_voltab.c
+)
+
+# OSAL needs conformance to at least POSIX.1c (aka POSIX 1995) - this includes all the
+# real-time support and threading extensions.
+#
+# When compiling against glibc, using "_XOPEN_SOURCE=600" enables the X/Open 6 standard.
+# XPG6 includes all necessary XPG5, POSIX.1c features as well as SUSv2/UNIX98 extensions.
+# This OSAL implementation uses clock_nanosleep(), mq_timedreceive(), and
+# mq_timedsend() which are enhancements added in the XPG6 standard.
+#
+# See http://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
+# for a more detailed description of the feature test macros and available values
+target_compile_definitions(osal_pc-linux_impl PUBLIC 
+    _XOPEN_SOURCE=600
+)
+
+add_library(ut_bsp STATIC EXCLUDE_FROM_ALL
+	ut-src/bsp_ut.c
+	ut-src/bsp_ut_voltab.c
+)
+target_include_directories(ut_bsp PRIVATE 
+	${UT_ASSERT_SOURCE_DIR}/inc
+)
+target_compile_definitions(ut_bsp PUBLIC 
+    _XOPEN_SOURCE=600
+)
+

src/bsp/pc-linux/build_options.cmake

@@ -0,0 +1,28 @@
+##########################################################################
+#
+# Build options for "pc-linux" BSP
+#
+##########################################################################
+
+
+
+# Linux system libraries required for the final link of applications using OSAL 
+target_link_libraries(osal 
+    pthread dl rt 
+)
+
+# C flags that should be used when (re-) compiling code for unit testing.
+# Note: --coverage is just a shortcut for "-ftest-coverage" and "-fprofile-arcs"
+# This also does not work well when cross compiling since paths to the _compile_ dir
+# are baked into the executables, so they will not be there when copied to the target
+# Note - although GCC understands the same flags for compile and link here, this may
+# not be true on all platforms so the compile and link flags are specified separately.
+if (NOT CMAKE_CROSSCOMPILING)
+  set(UT_COVERAGE_COMPILE_FLAGS -pg --coverage)
+  set(UT_COVERAGE_LINK_FLAGS    -pg --coverage)
+endif()
+
+# This indicates where to stage target binaries created during the build
+# It should reflect the _real_ location of the persistent storage path used by
+# the BSP which is intended to be used for runtime modules or files.
+set(OSAL_BSP_STAGING_INSTALL_DIR "eeprom1")

src/bsp/pc-rtems/CMakeLists.txt

@@ -0,0 +1,16 @@
+######################################################################
+#
+# CMAKE build recipe for PC-RTEMS Board Support Package (BSP)
+#
+######################################################################
+
+add_library(osal_pc-rtems_impl OBJECT 
+	src/bsp_start.c
+	src/bsp_voltab.c
+)
+
+add_library(ut_bsp STATIC EXCLUDE_FROM_ALL
+	ut-src/bsp_ut.c
+	ut-src/bsp_ut_voltab.c
+)
+target_include_directories(ut_bsp PRIVATE ${UT_ASSERT_SOURCE_DIR}/inc)

src/bsp/pc-rtems/build_options.cmake

@@ -0,0 +1,15 @@
+##########################################################################
+#
+# Build options for "pc-rtems" BSP
+#
+##########################################################################
+
+# Link the RTEMS BSP with the "rtemscpu" system library
+target_link_libraries(osal
+    rtemscpu
+)
+
+# This indicates where to stage target binaries created during the build
+# It should reflect the _real_ location of the persistent storage path used by
+# the BSP which is intended to be used for runtime modules or files.
+set(OSAL_BSP_STAGING_INSTALL_DIR "eeprom")

src/os/posix/CMakeLists.txt

@@ -0,0 +1,19 @@
+######################################################################
+#
+# CMAKE build recipe for POSIX OSAL implementation
+#
+######################################################################
+
+# This CMake script generates targets specific to the POSIX implementation
+# It defines an OBJECT target named "osal_posix_impl"
+
+add_library(osal_posix_impl OBJECT 
+	osapi.c
+	osfileapi.c
+	osfilesys.c
+	osloader.c
+	osnetwork.c
+	osselect.c
+	ostimer.c
+)
+

src/os/posix/build_options.cmake

@@ -1,30 +1,9 @@
+##########################################################################
 #
-# For POSIX systems based on glibc (i.e. Linux) certain features must be enabled
-# Glibc headers support multiple standards and multiple versions of the standards,
-# so the definitions of these macros determine which standard we will use
+# Build options for "posix" implementation layer
 #
-# OSAL needs conformance to at least POSIX.1c (aka POSIX 1995) - this includes all the
-# real-time support and threading extensions.
-#
-# When compiling against glibc, using "_XOPEN_SOURCE=600" enables the X/Open 6 standard.
-# XPG6 includes all necessary XPG5, POSIX.1c features as well as SUSv2/UNIX98 extensions.
-# This OSAL implementation uses clock_nanosleep(), mq_timedreceive(), and
-# mq_timedsend() which are enhancements added in the XPG6 standard.  (The previous OSAL
-# POSIX implementation needed only XPG5).  It may be possible to conditionally compile
-# these calls in case of a C library that does not have XPG6.
-#
-# Note that this definition assumes glibc -- in case of compiling OSAL for some platform
-# that supports POSIX but does not use glibc (e.g. uclibc) this definition shouldn't
-# harm anything, but it may need to be tweaked.
-#
-# See http://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
-# for a more detailed description of the feature test macros and available values
-#
-set(OSAL_COMMON_COMPILE_DEFS "${OSAL_COMMON_COMPILE_DEFS} -D_XOPEN_SOURCE=600")
-
-# OSAL_LINK_LIBS determines which system-level libraries must be included in the
-# link command in order to produce the final binary.  These libs will be used for
-# ALL targets that utilize the POSIX OS layer.  Additional target-specific libraries
-# may also be specified in the BSP or the cross-compile toolchain.
-set (OSAL_LINK_LIBS ${OSAL_LINK_LIBS} pthread dl rt)
+##########################################################################
 
+# this file is a placeholder for POSIX-specific compile tuning
+# currently no extra flags/definitions needed
+

src/os/rtems/CMakeLists.txt

@@ -0,0 +1,17 @@
+######################################################################
+#
+# CMAKE build recipe for RTEMS OSAL implementation
+#
+######################################################################
+
+# This CMake script generates targets specific to the RTEMS implementation
+# It defines an OBJECT target named "osal_rtems_impl"
+add_library(osal_rtems_impl OBJECT 
+	osapi.c
+	osfileapi.c
+	osfilesys.c
+	osloader.c
+	osnetwork.c
+	osselect.c
+	ostimer.c
+)

src/os/rtems/build_options.cmake

@@ -1,10 +1,9 @@
+##########################################################################
+#
+# Build options for "rtems" implementation layer
+#
+##########################################################################
 
-# Some upper-level code may be gated on _RTEMS_OS_ being defined
-set(OSAL_COMMON_COMPILE_DEFS "${OSAL_COMMON_COMPILE_DEFS} -D_RTEMS_OS_")
-
-# OSAL_LINK_LIBS determines which system-level libraries must be included in the
-# link command in order to produce the final binary.  These libs will be used for
-# ALL targets that utilize the RTEMS OS layer.  Additional target-specific libraries
-# may also be specified in the BSP or the cross-compile toolchain.
-SET(OSAL_LINK_LIBS rtemscpu)
-
+# this file is a placeholder for RTEMS-specific compile tuning
+# currently no extra flags/definitions needed
+