On Friday 25 March 2011, Chatterjee, Shash wrote: > Hi Alex, > > >- CMakeFindEclipseCDT4.cmake : this is slightly changed version from the > > one shipped with cmake 2.8.4, it produces debug output. Please replace > > the CMakeFindEclipseCDT4.cmake in your cmake 2.8.4 installation with this > > file. Then create a fresh and empty build directory, and let cmake run > > there, with the same command line as you posted. Capture the output, both > > stdout and stderr in a log file and post it here. > > Thanks for sending this, most illuminating :-) > > >I saw that you are using ccache, maybe this behaves slightly different for > >some things ? > > I am using Fedora Core 14, with all latest yum updates. I have not done > anything knowingly for cmake to prefer ccache over gcc directly, so looks > like by default cmake will use ccache over straight GCC if it finds it. Of > course, the speedup is most welcome. > > I have attached two versions of the log output. The first one is with the > problem reproduced. > > I noticed in your debug output that the C compiler was being detected as > blank, and no C++ include directories were being found even though the > compiler was detected as "GNU". I changed the project definition in my > CMakeLists.txt from "project ( eclipsetest CXX ) " to "project ( eclipstest > C CXX ) " and everything worked as expected.
Ah, indeed, it was using CMAKE_C_COMPILER also when finding out the C++ stuff, which works, but only if CMAKE_C_COMPILER is actually set. Please try the attached version, this should also work with your CXX-only project. Let me know whether it works for you. Thanks Alex
#============================================================================= # Copyright 2009 Kitware, Inc. # # Distributed under the OSI-approved BSD License (the "License"); # see accompanying file Copyright.txt for details. # # This software is distributed WITHOUT ANY WARRANTY; without even the # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # See the License for more information. #============================================================================= # (To distribute this file outside of CMake, substitute the full # License text for the above reference.) # This file is included in CMakeSystemSpecificInformation.cmake if # the Eclipse CDT4 extra generator has been selected. FIND_PROGRAM(CMAKE_ECLIPSE_EXECUTABLE NAMES eclipse DOC "The Eclipse executable") # This variable is used by the Eclipse generator and appended to the make invocation commands. SET(CMAKE_ECLIPSE_MAKE_ARGUMENTS "" CACHE STRING "Additional command line arguments when Eclipse invokes make. Enter e.g. -j<some_number> to get parallel builds") # This variable is used by the Eclipse generator in out-of-source builds only. SET(ECLIPSE_CDT4_GENERATE_SOURCE_PROJECT FALSE CACHE BOOL "If enabled, CMake will generate a source project for Eclipse in CMAKE_SOURCE_DIR") MARK_AS_ADVANCED(ECLIPSE_CDT4_GENERATE_SOURCE_PROJECT) # The Eclipse generator needs to know the standard include path # so that Eclipse ca find the headers at runtime and parsing etc. works better # This is done here by actually running gcc with the options so it prints its # system include directories, which are parsed then and stored in the cache. MACRO(_DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang _resultIncludeDirs _resultDefines) message(STATUS "Getting include dirs for ${_lang} ...") SET(${_resultIncludeDirs}) SET(_gccOutput) FILE(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy" "\n" ) IF (${_lang} STREQUAL "CXX") SET(_compilerExecutable "${CMAKE_CXX_COMPILER}") ELSE (${_lang} STREQUAL "CXX") SET(_compilerExecutable "${CMAKE_C_COMPILER}") ENDIF (${_lang} STREQUAL "CXX") EXECUTE_PROCESS(COMMAND ${_compilerExecutable} -v -E -x ${_lang} -dD dummy WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/CMakeFiles ERROR_VARIABLE _gccOutput OUTPUT_VARIABLE _gccStdout ) FILE(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy") MESSAGE(STATUS "stderr: -${_gccOutput}-") MESSAGE(STATUS "stdout: -${_gccStdout}-") # First find the system include dirs: IF( "${_gccOutput}" MATCHES "> search starts here[^\n]+\n *(.+) *\n *End of (search) list" ) # split the output into lines and then remove leading and trailing spaces from each of them: STRING(REGEX MATCHALL "[^\n]+\n" _includeLines "${CMAKE_MATCH_1}") FOREACH(nextLine ${_includeLines}) STRING(STRIP "${nextLine}" _includePath) LIST(APPEND ${_resultIncludeDirs} "${_includePath}") ENDFOREACH(nextLine) ENDIF( "${_gccOutput}" MATCHES "> search starts here[^\n]+\n *(.+) *\n *End of (search) list" ) # now find the builtin macros: STRING(REGEX MATCHALL "#define[^\n]+\n" _defineLines "${_gccStdout}") # A few example lines which the regexp below has to match properly: # #define MAX(a,b) ((a) > (b) ? (a) : (b)) # #define __fastcall __attribute__((__fastcall__)) # #define FOO (23) # #define __UINTMAX_TYPE__ long long unsigned int # #define __UINTMAX_TYPE__ long long unsigned int # #define __i386__ 1 FOREACH(nextLine ${_defineLines}) STRING(REGEX MATCH "^#define +([A-Za-z_][A-Za-z0-9_]*)(\\([^\\)]+\\))? +(.+) *$" _dummy "${nextLine}") SET(_name "${CMAKE_MATCH_1}${CMAKE_MATCH_2}") STRING(STRIP "${CMAKE_MATCH_3}" _value) #MESSAGE(STATUS "m1: -${CMAKE_MATCH_1}- m2: -${CMAKE_MATCH_2}- m3: -${CMAKE_MATCH_3}-") LIST(APPEND ${_resultDefines} "${_name}") IF(_value) LIST(APPEND ${_resultDefines} "${_value}") ELSE() LIST(APPEND ${_resultDefines} " ") ENDIF() ENDFOREACH(nextLine) ENDMACRO(_DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang) # Save the current LC_ALL, LC_MESSAGES, and LANG environment variables and set them # to "C" that way GCC's "search starts here" text is in English and we can grok it. SET(_orig_lc_all $ENV{LC_ALL}) SET(_orig_lc_messages $ENV{LC_MESSAGES}) SET(_orig_lang $ENV{LANG}) IF(_orig_lc_all) SET(ENV{LC_ALL} C) ENDIF(_orig_lc_all) IF(_orig_lc_messages) SET(ENV{LC_MESSAGES} C) ENDIF(_orig_lc_messages) IF(_orig_lang) SET(ENV{LANG} C) ENDIF(_orig_lang) message(STATUS "This is CMakeFindEclipse.cmake, compiler id is -${CMAKE_C_COMPILER_ID}- , -${CMAKE_CXX_COMPILER_ID}-") # Now check for C, works for gcc and Intel compiler at least IF (NOT CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS) IF ("${CMAKE_C_COMPILER_ID}" MATCHES GNU OR "${CMAKE_C_COMPILER_ID}" MATCHES Intel) _DETERMINE_GCC_SYSTEM_INCLUDE_DIRS(c _dirs _defines) SET(CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS "${_dirs}" CACHE INTERNAL "C compiler system include directories") SET(CMAKE_ECLIPSE_C_SYSTEM_DEFINED_MACROS "${_defines}" CACHE INTERNAL "C compiler system defined macros") ENDIF ("${CMAKE_C_COMPILER_ID}" MATCHES GNU OR "${CMAKE_C_COMPILER_ID}" MATCHES Intel) ENDIF (NOT CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS) # And now the same for C++ IF (NOT CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS) IF ("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU OR "${CMAKE_CXX_COMPILER_ID}" MATCHES Intel) _DETERMINE_GCC_SYSTEM_INCLUDE_DIRS(c++ _dirs _defines) SET(CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS "${_dirs}" CACHE INTERNAL "CXX compiler system include directories") SET(CMAKE_ECLIPSE_CXX_SYSTEM_DEFINED_MACROS "${_defines}" CACHE INTERNAL "CXX compiler system defined macros") ENDIF ("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU OR "${CMAKE_CXX_COMPILER_ID}" MATCHES Intel) ENDIF (NOT CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS) # Restore original LC_ALL, LC_MESSAGES, and LANG IF(_orig_lc_all) SET(ENV{LC_ALL} ${_orig_lc_all}) ENDIF(_orig_lc_all) IF(_orig_lc_messages) SET(ENV{LC_MESSAGES} ${_orig_lc_messages}) ENDIF(_orig_lc_messages) IF(_orig_lang) SET(ENV{LANG} ${_orig_lang}) ENDIF(_orig_lang)
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