cmake: Added ENABLE_STATIC_LIBS option

- Allows building static libraries
- For users calling find_package(UHD), provides extra options
  for building apps statically linking UHD.
- Updated the init_usrp example to link UHD statically.

1 files changed, 118 insertions, 0 deletions

diff --git a/host/cmake/Modules/UHDConfig.cmake.in b/host/cmake/Modules/UHDConfig.cmake.in
new file mode 100644
index 000000000..78f01706f
--- /dev/null
+++ b/host/cmake/Modules/UHDConfig.cmake.in
@@ -0,0 +1,118 @@
+#
+# Copyright 2014 Ettus Research LLC
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+########################################################################
+#
+# Find the header <uhd/config.hpp> and library "libuhd" for the USRP
+# Hardware Driver.  Priorty for prefix search is:
+# 1) ENV(UHD_DIR)
+# 2) pkg-config results, if available;
+# 3) CMAKE_INSTALL_PREFIX
+# 4) /usr/local/
+# 5) /usr/
+#
+# Version info is handled by UHDConfigVersion.cmake only; not here.
+#
+########################################################################
+
+# set that this file was found, for use in GNU Radio's FindUHD.cmake.
+# Have to use the ENV, since this file might not allow CACHE changes.
+
+set(ENV{UHD_CONFIG_USED} TRUE)
+
+# set default values
+
+SET(UHD_FOUND TRUE)
+SET(UHD_INCLUDE_HINTS)
+SET(UHD_LIBDIR_HINTS)
+SET(UHD_DIR $ENV{UHD_DIR})
+
+IF(UHD_DIR)
+    LIST(APPEND UHD_INCLUDE_HINTS ${UHD_DIR}/include)
+    LIST(APPEND UHD_LIBDIR_HINTS ${UHD_DIR}/lib)
+ENDIF()
+
+INCLUDE(FindPkgConfig)
+IF(PKG_CONFIG_FOUND)
+  IF(NOT ${CMAKE_VERSION} VERSION_LESS "2.8.0")
+    SET(UHD_QUIET "QUIET")
+  ENDIF()
+  PKG_CHECK_MODULES(PC_UHD ${UHD_QUIET} uhd)
+  IF(PC_UHD_FOUND)
+    LIST(APPEND UHD_INCLUDE_HINTS ${PC_UHD_INCLUDEDIR})
+    LIST(APPEND UHD_LIBDIR_HINTS ${PC_UHD_LIBDIR})
+  ENDIF()
+ENDIF()
+
+LIST(APPEND UHD_INCLUDE_HINTS ${CMAKE_INSTALL_PREFIX}/include)
+LIST(APPEND UHD_LIBDIR_HINTS ${CMAKE_INSTALL_PREFIX}/lib)
+
+
+# Search for static libs if so required
+IF( UHD_USE_STATIC_LIBS )
+    SET( _UHD_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
+    IF(WIN32)
+        SET(CMAKE_FIND_LIBRARY_SUFFIXES .lib .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
+    ELSE()
+        SET(CMAKE_FIND_LIBRARY_SUFFIXES .a )
+    ENDIF()
+    # This is set during build of UHD to match the installed version:
+    SET(UHD_STATIC_LIB_DEPS "@UHD_LINK_LIST_STATIC@")
+ENDIF()
+
+# Verify that <uhd/config.hpp> and libuhd are available, and, if a
+# version is provided, that UHD meets the version requirements -- no
+# matter what pkg-config might think.
+
+FIND_PATH(
+    UHD_INCLUDE_DIRS
+    NAMES uhd/config.hpp
+    HINTS ${UHD_INCLUDE_HINTS}
+    PATHS /usr/local/include
+          /usr/include
+)
+
+FIND_LIBRARY(
+    UHD_LIBRARIES
+    NAMES uhd
+    HINTS ${UHD_LIBDIR_HINTS}
+    PATHS /usr/local/lib
+          /usr/lib
+)
+
+# Set up linker flags for static linking:
+IF(UHD_USE_STATIC_LIBS)
+    IF(WIN32)
+        MESSAGE(FATAL_ERROR "Static linking not available on Windows")
+    ELSE(WIN32)
+        # This works for gcc and Clang:
+        SET(UHD_STATIC_LIB_LINK_FLAG "-Wl,-whole-archive ${UHD_LIBRARIES} -Wl,-no-whole-archive")
+    ENDIF(WIN32)
+    # Restore the library suffixes, if we changed them:
+    SET(CMAKE_FIND_LIBRARY_SUFFIXES ${_UHD_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES})
+ENDIF(UHD_USE_STATIC_LIBS)
+
+IF(UHD_LIBRARIES AND UHD_INCLUDE_DIRS)
+
+  INCLUDE(FindPackageHandleStandardArgs)
+  FIND_PACKAGE_HANDLE_STANDARD_ARGS(UHD DEFAULT_MSG UHD_LIBRARIES UHD_INCLUDE_DIRS)
+  MARK_AS_ADVANCED(UHD_LIBRARIES UHD_INCLUDE_DIRS)
+
+ELSEIF(UHD_FIND_REQUIRED)
+
+  MESSAGE(FATAL_ERROR "UHD is required, but was not found.")
+
+ENDIF()