I added a prink in /arch/x86/kernel/setup.c and I tried to run make after modifying the file but it shows errors as in the Title.
I have Makefile in that directory and don't know how to solve it
You need to make sure you have run one of the make XXXconfig options. I recommend make localmodconfig. Then you can run make. Just make sure you run make in the top level linux source directory and not one of the sub directories as those only contain lines such as obj-o += setup.o ... and no actual build targets.
Related
I'm trying to use add_custom_command to generate a file during the build. The command never seemed to be run, so I made this test file.
cmake_minimum_required( VERSION 2.6 )
add_custom_command(
OUTPUT hello.txt
COMMAND touch hello.txt
DEPENDS hello.txt
)
I tried running:
cmake .
make
And hello.txt was not generated. What have I done wrong?
The add_custom_target(run ALL ... solution will work for simple cases when you only have one target you're building, but breaks down when you have multiple top level targets, e.g. app and tests.
I ran into this same problem when I was trying to package up some test data files into an object file so my unit tests wouldn't depend on anything external. I solved it using add_custom_command and some additional dependency magic with set_property.
add_custom_command(
OUTPUT testData.cpp
COMMAND reswrap
ARGS testData.src > testData.cpp
DEPENDS testData.src
)
set_property(SOURCE unit-tests.cpp APPEND PROPERTY OBJECT_DEPENDS testData.cpp)
add_executable(app main.cpp)
add_executable(tests unit-tests.cpp)
So now testData.cpp will generated before unit-tests.cpp is compiled, and any time testData.src changes. If the command you're calling is really slow you get the added bonus that when you build just the app target you won't have to wait around for that command (which only the tests executable needs) to finish.
It's not shown above, but careful application of ${PROJECT_BINARY_DIR}, ${PROJECT_SOURCE_DIR} and include_directories() will keep your source tree clean of generated files.
Add the following:
add_custom_target(run ALL
DEPENDS hello.txt)
If you're familiar with makefiles, this means:
all: run
run: hello.txt
The problem with two existing answers is that they either make the dependency global (add_custom_target(name ALL ...)), or they assign it to a specific, single file (set_property(...)) which gets obnoxious if you have many files that need it as a dependency. Instead what we want is a target that we can make a dependency of another target.
The way to do this is to use add_custom_command to define the rule, and then add_custom_target to define a new target based on that rule. Then you can add that target as a dependency of another target via add_dependencies.
# this defines the build rule for some_file
add_custom_command(
OUTPUT some_file
COMMAND ...
)
# create a target that includes some_file, this gives us a name that we can use later
add_custom_target(
some_target
DEPENDS some_file
)
# then let's suppose we're creating a library
add_library(some_library some_other_file.c)
# we can add the target as a dependency, and it will affect only this library
add_dependencies(some_library some_target)
The advantages of this approach:
some_target is not a dependency for ALL, which means you only build it when it's required by a specific target. (Whereas add_custom_target(name ALL ...) would build it unconditionally for all targets.)
Because some_target is a dependency for the library as a whole, it will get built before all of the files in that library. That means that if there are many files in the library, we don't have to do set_property on every single one of them.
If we add DEPENDS to add_custom_command then it will only get rebuilt when its inputs change. (Compare this to the approach that uses add_custom_target(name ALL ...) where the command gets run on every build regardless of whether it needs to or not.)
For more information on why things work this way, see this blog post: https://samthursfield.wordpress.com/2015/11/21/cmake-dependencies-between-targets-and-files-and-custom-commands/
This question is pretty old, but even if I follow the suggested recommendations, it does not work for me (at least not every time).
I am using Android Studio and I need to call cMake to build C++ library. It works fine until I add the code to run my custom script (in fact, at the moment I try to run 'touch', as in the example above).
First of,
add_custom_command
does not work at all.
I tried
execute_process (
COMMAND touch hello.txt
)
it works, but not every time!
I tried to clean the project, remove the created file(s) manually, same thing.
Tried cMake versions:
3.10.2
3.18.1
3.22.1
when they work, they produce different results, depending on cMake version, one file or several. This is not that important as long as they work, but that's the issue.
Can somebody shed light on this mystery?
I need to build libpng, but without #define PNG_READ_eXIf_SUPPORTED in pnglibconf.h
I've read comments from pnglibconf.dfa, and here are some ways of disabling features, however I didn't manage to make what I want using them.
The problem is in that, build process is performed on build server, so I can't change any files inside of libpng submodule. Here is how server works:
Download clone sources from git
Generate makefile by running cmake ..
Run make command.
Thus I have libnpg, but with included PNG_READ_eXIf_SUPPORTED option.
Libpng is a submodule of my project, so it checked out by build server automatically so I can't change pnglibconf manually.
As it said in pnglibconf.dfa file:
There are three ways of disabling features, in no particular order:
1) Create 'pngusr.h', enter the required private build information
detailed below and #define PNG_NO_<option> for each option you
don't want in that file in that file. You can also turn on options
using PNG_<option>_SUPPORTED. When you have finished rerun
configure and rebuild pnglibconf.h file with -DPNG_USER_CONFIG:
make clean
CPPFLAGS='-DPNG_USER_CONFIG' ./configure
make pnglibconf.h
pngusr.h is only used during the creation of pnglibconf.h, but it
is safer to ensure that -DPNG_USER_CONFIG is specified throughout
the build by changing the CPPFLAGS passed to the initial ./configure
I tried to do what is written here. I run cmake .. -DCMAKE_C_FLAGS="-DPNG_USER_CONFIG -I/home/me/dev/include" where /home/me/dev/include - is a path to pngusr.h file
Then I run make command. However, PNG_READ_eXIf_SUPPORTED is still present in generated (by make command pnglibconf.h file).
So my main question is how to make libpng without PNG_READ_eXIf_SUPPORTED option?
It remains unclear to me whether and to what extent the specific customization mechanism you are trying to use works in the version of libpng you are trying to use. But it looks like there's a simpler way. Just below the excerpt you posted, in the same file, is the second (of three) alternatives:
2) Add definitions of the settings you want to change to CPPFLAGS;
for example:
-DPNG_DEFAULT_READ_MACROS=0
(lightly formatted). I'm not in a good position to test that on the CMake-based build system, but it seems to work like a charm in the Autotools build system. From examining and comparing the two, I think it will work for CMake, too. In particular, you would want to run
cmake .. -DCMAKE_CPP_FLAGS="-DPNG_NO_READ_eXIf"
for your particular case.
Note, by the way, that the CPP (i.e. preprocessor) flags are the right place for an option such as you are specifying (for -DPNG_USR_CONFIG in your original attempt, too). In practice, though, they probably still work in the C compiler flags.
I have a Makefile as follows:
work/step1.tab: temp.tab hcp_raw_data_sample.tab
command
work/step2.tab: work/step1.tab
command
I have temp.tab and hcp_raw_data_sample.tab in the home directory and want step1.tab and step2.tab to be created in the work directory. However, it is only step1.tab which gets created; step2.tab does not. What do I do?
When you run make it builds the first target listed in the makefile, in this case work/step1.tab. It doesn't see any reason to build step2.tab because it had everything it needed to build step1, which was the default target.
To have it build both, move work/step2.tab above work/step1.tab. This makes work/step2.tab the default target.
This way it will see that it needs to build work/step1.tab before it can build work/step2.tab, so it will do so, and then it will build work/step2.tab.
Make executes only the first target. Usually you create a target all that creates all sub-targets you want. If you place all as the first target, that will be built if you call make.
This is the way I install the config files:
file(GLOB ConfigFiles ${CMAKE_CURRENT_SOURCE_DIR}/configs/*.xml
${CMAKE_CURRENT_SOURCE_DIR}/configs/*.xsd
${CMAKE_CURRENT_SOURCE_DIR}/configs/*.conf)
install(FILES ${ConfigFiles} DESTINATION ${INSTDIR})
But I need to convert one of the xml files before installing it. There is an executable that can do this job for me:
./Convertor a.xml a-converted.xml
How can I automatically convert the xml file before installing it? It should be a custom command or target that installing depends on it, I just don't know how to make the install command depend on it though. Any advice would be appreciated!
Take a look at the SCRIPT version of install:
The SCRIPT and CODE signature:
install([[SCRIPT <file>] [CODE <code>]] [...])
The SCRIPT form will invoke the given CMake script files during
installation. If the script file name is a relative path it will be
interpreted with respect to the current source directory. The CODE
form will invoke the given CMake code during installation. Code is
specified as a single argument inside a double-quoted string.
For example:
install(CODE "execute_process(\"./Convertor a.xml a-converted.xml\")")
install(FILES a-converted.xml DESTINATION ${INSTDIR})
Be sure to checkout the entry for execute_process in the manual. Also be aware that macro expansion inside the CODE parameter can be a bit tricky to get right. Check the generated cmake_install.cmake in your build directory where the generated code will be placed.
I think that your specific case would work better if you were to use a custom command and target like so:
add_custom_command(
OUTPUT ${CMAKE_BINARY_DIR}/a-converted.xml
COMMAND ./Convertor a.xml a-converted.xml
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/Convertor
)
add_custom_target(run ALL
DEPENDS ${CMAKE_BINARY_DIR}/a-converted.xml
COMMENT "Generating a-converted.xml" VERBATIM
)
install(
FILES ${CMAKE_BINARY_DIR}/a-converted.xml
DESTINATION ${INSTDIR}
)
Note: I don't have all the details, so the directories are probably
not exactly what you'd want in your environment, although it's
a good idea to generate files in the ${CMAKE_BINARY_DIR} area.
That way you can be sure that the file a-converted.xml is built at the time you want to install it. Especially, these two rules make sure that if you make changes to the file, it gets recompiled.
Should it generally be possible to run a program from the source directory (src) after having invoked ./configure and make (but not make install)? I'm trying to fix a bug in an application and it seems unnecessary to run make install after each code change. Unfortunately I can't run the application in the source directory since it tries to access files in the lib installation directory (which do not exist before make install). Is the application wrongly configured or do I have to reinstall it after each change to the source code?
It all depends on the application and what components or files it expects to be visible and where. But assuming no required configuration or dependencies, then yes, you can run the program in-place.
To add a directory to your lib search path, add to the environment variable LD_LIBRARY_PATH. Like so:
LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/home/user/myproject/lib" ./someprogram
Note that specifiying a variable assignment on the command line in front of the program you run sets that variable for that run only. (Note, no semicolon -- this is a single command.) If you want to set the variable for the entire session, use
export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/home/user/myproject/lib"
I'd recommend against this, though. It can lead to problems and confusion.