Re: [CMake] Prefix header for Makefiles
CMake does not really support this. At build time CMake scans the source files and builds the depend list. Since your file is not actually included it does not end up in the depend list. To add this as a feature you would have to put the information into DependInfo.cmake and have cmDependsC.cxx read the information. If you are interested, I would suggest you come up with a patch and post it to the cmake-developer mailing list. You could also try the ninja generator as it uses the compiler to compute depends and should have the correct information. -Bill -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
Re: [CMake] Prefix header for Makefiles
Hi, On Wed, Aug 26, 2015 at 3:10 PM, Jakob van Bethlehem jsvanbethle...@gmail.com wrote: Hej Andrew, CMake does never scan source files (as far as I know), as it is not a compiler. From your question it almost seem you are making this assumption, so I just wanted to make sure to mention at least this. Thats wrong, CMake has to parse the source files you add to a target to be able to determine its dependencies (recursively) so it can generate makefile rules that ensure that if one of the (indirectly) included headers changes the source file is recompiled. You can see this in cmDependsC.cxx in the CMake sources for C (and possibly C++) source files. It of course does not parse the C/C++ code, it merely finds lines that start with #include or #import and figures out the absolute path of the mentioned header file based on the targets include directories. Of course you can help CMake here by specifying all headers in the add_executable/add_library call, but that easily ends up being a maintenance nightmare for files outside of your actual project (system headers, third-party libraries etc.). Andreas -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
Re: [CMake] Prefix header for Makefiles
Hi,
You are wrong. CMake, during configuration/generation phase generates
dependencies over C/C++ files.
So, the simple approach to handle dependency between Cpp and h files is to let
CMake handle it:
add_executable (my_exe Main.cpp)
And, that it! By default current source directory is passed to the compiler for
resolving #include directives.
And for adding other directories, use command target_include_directories.
Marc
From: CMake on behalf of Jakob van Bethlehem
Date: Wednesday 26 August 2015 15:10
To: cmake@cmake.orgmailto:cmake@cmake.org
Subject: Re: [CMake] Prefix header for Makefiles
Hej Andrew,
CMake does never scan source files (as far as I know), as it is not a compiler.
From your question it almost seem you are making this assumption, so I just
wanted to make sure to mention at least this.
Then, for your particular issue: two things that come to my mind:
* I’d imagine you have somewhere a add_executable(main Main.cpp Prefix.h
DependHeader.h) - as far as I can tell, the only thing that really matters, is
that the main executable gets recompiled whenever you make a change in any of
the headers. To put it differently, I *don’t* think you (should) need the
OBJECT_DEPENDS.
* If you’re worried about scaling, maybe you could have a look at the file(GLOB
) command. However, be sure to also carefully read the potential problems with
that approach. In my current (big) project, we explicitly list each source file
for most parts of the source tree. In practice you’re surely *not* going to add
all 50 new files at once. It is a very simple thing to add the newly created
file to some variable in the correct CMakeLists.txt file. You just have to
remember to do it, it’s really not a big deal.
By the way, we’re actually using the PrecompiledHeader script - it works
flawlessly.
Sincerely, Jakob
On 26 Aug 2015, at 11:48, Andrew Shaitorov
andrew.shaito...@gmail.commailto:andrew.shaito...@gmail.com wrote:
Hi All!
I have a very annoying problem with CMake Makefiles generator.
I'm using prefix header (see attached archive for minimized test).
There is one source file named Main.cpp and two header files: Prefix.h and
DependHeader.h. Prefix.h includes DependHeader.h and Main.cpp includes Prefix.h
by using prefix header compiler flag (-include for GCC/Clang and /FI for MSVC):
set_source_files_properties(Main.cpp PROPERTIES
COMPILE_FLAGS -include Prefix.h
OBJECT_DEPENDS ${CMAKE_CURRENT_LIST_DIR}/Prefix.h)
When I change Prefix.h, then make recompiles Main.cpp as needed. But when I
make a change in DependHeader.h, then no recompilation happens. Its clear for
me that I have to specify all depend files in OBJECT_DEPENDS option, but in
real project there may be a lot of depend files with nested includes. And the
most annoying thing is that the project compiles without any errors and may
just crash because of struct layout or other critical changes in depend headers.
I seems like the following script have the same problem when using
FORCE_INCLUDE option:
https://github.com/larsch/cmake-precompiled-header/blob/master/PrecompiledHeader.cmake
I looked in CMake source code and didn't find a way to add Prefix.h in a list
for dependency scanning. Also I don't know how to run depend scanner on
Prefix.h in CMake script to generate a list of all depend files for
OBJECT_DEPENDS option.
Any advise?
Best,
Andrew.
CMakePrefixHeaderTest.zip--
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Re: [CMake] Prefix header for Makefiles
Hej Andrew,
CMake does never scan source files (as far as I know), as it is not a compiler.
From your question it almost seem you are making this assumption, so I just
wanted to make sure to mention at least this.
Then, for your particular issue: two things that come to my mind:
* I’d imagine you have somewhere a add_executable(main Main.cpp Prefix.h
DependHeader.h) - as far as I can tell, the only thing that really matters, is
that the main executable gets recompiled whenever you make a change in any of
the headers. To put it differently, I *don’t* think you (should) need the
OBJECT_DEPENDS.
* If you’re worried about scaling, maybe you could have a look at the file(GLOB
) command. However, be sure to also carefully read the potential problems with
that approach. In my current (big) project, we explicitly list each source file
for most parts of the source tree. In practice you’re surely *not* going to add
all 50 new files at once. It is a very simple thing to add the newly created
file to some variable in the correct CMakeLists.txt file. You just have to
remember to do it, it’s really not a big deal.
By the way, we’re actually using the PrecompiledHeader script - it works
flawlessly.
Sincerely, Jakob
On 26 Aug 2015, at 11:48, Andrew Shaitorov andrew.shaito...@gmail.com wrote:
Hi All!
I have a very annoying problem with CMake Makefiles generator.
I'm using prefix header (see attached archive for minimized test).
There is one source file named Main.cpp and two header files: Prefix.h and
DependHeader.h. Prefix.h includes DependHeader.h and Main.cpp includes
Prefix.h by using prefix header compiler flag (-include for GCC/Clang and /FI
for MSVC):
set_source_files_properties(Main.cpp PROPERTIES
COMPILE_FLAGS -include Prefix.h
OBJECT_DEPENDS ${CMAKE_CURRENT_LIST_DIR}/Prefix.h)
When I change Prefix.h, then make recompiles Main.cpp as needed. But when I
make a change in DependHeader.h, then no recompilation happens. Its clear for
me that I have to specify all depend files in OBJECT_DEPENDS option, but in
real project there may be a lot of depend files with nested includes. And the
most annoying thing is that the project compiles without any errors and may
just crash because of struct layout or other critical changes in depend
headers.
I seems like the following script have the same problem when using
FORCE_INCLUDE option:
https://github.com/larsch/cmake-precompiled-header/blob/master/PrecompiledHeader.cmake
https://github.com/larsch/cmake-precompiled-header/blob/master/PrecompiledHeader.cmake
I looked in CMake source code and didn't find a way to add Prefix.h in a list
for dependency scanning. Also I don't know how to run depend scanner on
Prefix.h in CMake script to generate a list of all depend files for
OBJECT_DEPENDS option.
Any advise?
Best,
Andrew.
CMakePrefixHeaderTest.zip--
Powered by www.kitware.com
Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Kitware offers various services to support the CMake community. For more
information on each offering, please visit:
CMake Support: http://cmake.org/cmake/help/support.html
CMake Consulting: http://cmake.org/cmake/help/consulting.html
CMake Training Courses: http://cmake.org/cmake/help/training.html
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Follow this link to subscribe/unsubscribe:
http://public.kitware.com/mailman/listinfo/cmake
--
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Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Kitware offers various services to support the CMake community. For more
information on each offering, please visit:
CMake Support: http://cmake.org/cmake/help/support.html
CMake Consulting: http://cmake.org/cmake/help/consulting.html
CMake Training Courses: http://cmake.org/cmake/help/training.html
Visit other Kitware open-source projects at
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Follow this link to subscribe/unsubscribe:
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