I am trying to compile a simple hello world program written in objective c from ubuntu but I am getting an error as
gcc: error: unrecognized command line option ‘-fobjc-nonfragile-abi’
To compile I am using the command
gcc gnustep-config --objc-flags -lgnustep-base hello.m -o hello
Can you please help me out with this. I am not getting any solution in google too.
The best way to compile gnustep code is with makefiles. It avoids all this faff with GCC:
make a file called GNUmakefile
Make the content:
include $(GNUSTEP_MAKEFILES)/common.make
TOOL_NAME=hello
hello_OBJC_FILES=hello.m
include $(GNUSTEP_MAKEFILES)/tool.make
just type:
make
to compile, the output is in the obj/ dir
I would give this a read
http://www.gnustep.it/nicola/Tutorials/WritingMakefiles/
Now a problem I always have is it can't find the gnustep makefiles.
The long term fix is to add it to path, the quick fix is every session, type:
export GNUSTEP_MAKEFILES=/usr/share/GNUstep/Makefiles
/usr/share/GNUstep/Makefiles is my gnustep makefile dir, YOURS MAY BE DIFFERENT! but I assume that this is the dir if you installed gnustep like this:
apt-get install gnustep gnustep-devel
it may be worth making sure you have the gnustep-devel package!
Good luck!
Related
I am an llvm beginner. I compiled llvm which checked from svn, and I got the error: unknown cmake command add_llvm_loadable_module when using cmake to create a makefile in llvmroot/lib/Transform/Hello/build. I have no idea why this occur. Is there something wrong when compiling llvm? In this case, I compiled llvm by cmake -G "Unix Makefiles" in macros. Thanks for your help.
You just mixed things up.
You should cd into ~/llvm/build and run cmake ~/llvm or cmake ... And you don't need -DCMAKE_PREFIX_PATH at all in this case.
This command will just generate build files for you. Now, if you want to build only that Hello pass instead of whole LLVM, run make help | grep Hello to find out how the corresponding target is called and then make <target>.
You should used add_llvm_library in CMakeLists.txt
like this:
add_llvm_library(My_Plugin MODULE My_Plugin.cpp PLUGIN_TOOL clang)
I am a newbie to Objective C programs. I'm learning to code from tutorialspoint.com
As mentioned therein I downloaded GNUstep (Windows).
First, installed the MSYS/MinGW System package and then core package.
After that followed the steps mentioned there. I created a simple program with name hello.m and Stored that in C drive (Snapshot 1)
I don't know the meaning of this command below but entered it:
$ gcc gnustep-config --objc-flags -L /GNUstep/System/Library/Libraries hello.m -o hello -lgnustep-base -lobjc
The error it shows is - sh: gcc: command not found
Please help with the same, to compile and run my first Objective C program
gcc is the compiler, the other parameters are for compiling objective-c code.
Apparently you have misconfiguration in MSYS/MinGW setup.
Check out following post which has alternative and easier solution for running gcc under Windows.
I am trying to build SLitrani on Ubuntu 12.04 64-bit. I have already built ROOT 5.34.03 from source and I did figure out how to set the LD_LIBRARY_PATH and PATH variables for $ROOTDEV so the problem is not there but when I try to make SplineFit I get
>>> g++: error: unrecognized option ‘-soname=libSplineFit.so’
make: *** [libSplineFit.so] Error 1
I also did change all the -m32 to -m64 in the Makefiles so I don't know what is going on. I was able to get TwoPad installed but I can't continue from SplineFit. I have been on this build for quite some time and would appreciate any help.
From memory, soname is a linker operation, not a compiler one. So, if you're doing it with g++, you may need to change the option into something like:
-Wl,-soname=libSplineFit.so
The following transcript shows that this is necessary:
pax> g++ --soname=x -Wall -o qq qq.cpp
cc1plus: error: unrecognized command line option "-fsoname=x"
pax> g++ -Wl,-soname=x -Wall -o qq qq.cpp
pax>
From the online GNU docs for gcc:
-Wl,option: pass option as an option to the linker. If option contains commas, it is split into multiple options at the commas.
I know this is an old question but after a week of struggling I thought I should post my findings.
I've successfully edited the makefiles for this so they can compile on Ubuntu 12.04 x64.
You can remove the -soname option completely, it seemingly is unnecessary.
As mentioned: all "m32" change to "m64".
You can replace "$ROOTSYS/libs" with "$ROOTLIBS"
and with TwoPad makefile reorder the library order (under LIBS += (.....)) so that -lTwoPad is NOT last on the list, and for VisuSLitrani make -lPhysMore last in its group.
As far as I know the errors saying "set but not used" can be ignored.
If any of this still doesn't work contact me back and I can send you my makefiles.
Here a nice explanation of the -soname linker option, how to call it and what it is good for.
Summary
You can simply use gcc -shared -Wl,-soname,libfoo_v1.so -o libfoo_v1.so libfoo_v1.o and skip the following discussion ;)
call it as gcc -shared -Wl,-soname,libfoo.so -o libfoo_v1.so libfoo_v1.o
after compiling you need to create an symbolic link pointing to libfoo_v1.so ln -s libfoo_v1.so libfoo.so before you can execute your code.
This is used to link against different shared libraries during compiletime and runtime. Obviously these libraries need a similar interface. You can use this for managing different versions.
I'm learning Objective-C language. Since I don't have a Mac, I'm compiling and running my code within Ubuntu 11.04 platform.
Until now, I was using gcc to compile. I've installed GNUStep and all was working. But then I started to try some Objective-C 2.0 features, like #property and #synthesize, that gcc does not allow.
So I tried to compile the code with Clang, but it seems that it is not correctly linking my code with the GNUStep libraries, not even with a simple Hello world program.
For example, if I compile the following code:
#import <Foundation/Foundation.h>
int main(void) {
NSLog(#"Hello world!");
return 0;
}
The output of the compiler is:
/tmp/cc-dHZIp1.o: In function `main':
test.m:(.text+0x1f): undefined reference to `NSLog'
/tmp/cc-dHZIp1.o: In function `.objc_load_function':
test.m:(.text+0x3c): undefined reference to `__objc_exec_class'
collect2: ld returned 1 exit status
clang: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)
The command I'm using to compile is
clang -I /usr/include/GNUstep/ test.m -o test
with the -I directive to include the GNUStep libraries (otherwise, Clang is not able to find Foundation.h).
I've googled my problem, and visited both GNUStep and Clang web pages, but I haven't found a solution to it. So any help will be appreciated.
Thanks!
The problem was that the library gnustep-base was not being used by the linker. So the solution to this was using the option -Xlinker, that sends arguments to the linker used by clang:
clang -I /usr/include/GNUstep/ -Xlinker -lgnustep-base test.m -o test
The statement "-X linker -lgnustep-base" made the magic. However, I had problems with this command related to the class that represents a string in Objective-C:
./test: Uncaught exception NSInvalidArgumentException, reason: GSFFIInvocation:
Class 'NXConstantString'(instance) does not respond to forwardInvocation: for
'hasSuffix:'
I could solve it adding the argument "-fconstant-string-class=NSConstantString":
clang -I /usr/include/GNUstep/ -fconstant-string-class=NSConstantString \
-Xlinker -lgnustep-base test.m -o test
In addition, I've tried with some Objective-C 2.0 pieces of code and it seems to work.
Thank you for the help!
You can try gcc compiler:
First of all install GNU Objective-C Runtime: sudo apt-get install gobjc
then compile: gcc -o hello hello.m -Wall -lobjc
You are not able to use ObjC 2.0 features because you're missing a ObjC-runtime supporting those. GCC's runtime is old and outdated, it doesn't support ObjC 2.0. Clang/LLVM doesn't have a acompanied runtime, you need to install the ObjC2-runtime from GNUstep (which can be found here: https://github.com/gnustep/libobjc2 ) and reinstall GNUstep using this runtime.
Here are some bash scripts for different Ubuntu versions, that do everything for you:
http://wiki.gnustep.org/index.php/GNUstep_under_Ubuntu_Linux
And please don't try to reinvent GNUstep make, instead, use it:
http://www.gnustep.org/resources/documentation/Developer/Make/Manual/gnustep-make_1.html
If you really don't think so, here is some excerpt from there:
1.2 Structure of a Makefile
Here is an example makefile (named GNUmakefile to emphasis the fact that it relies on special features of the GNU make program).
#
# An example GNUmakefile
#
# Include the common variables defined by the Makefile Package
include $(GNUSTEP_MAKEFILES)/common.make
# Build a simple Objective-C program
TOOL_NAME = simple
# The Objective-C files to compile
simple_OBJC_FILES = simple.m
-include GNUmakefile.preamble
# Include in the rules for making GNUstep command-line programs
include $(GNUSTEP_MAKEFILES)/tool.make
-include GNUmakefile.postamble
This is all that is necessary to define the project.
In your case replace all occurrences of simple with test and you're done
1.3 Running Make
Normally to compile a package which uses the Makefile Package it is purely a matter of typing make from the top-level directory of the package, and the package is compiled without any additional interaction.
I was just starting to study obj-c on Ubuntu Linux today, the tutorial that I followed is http://www.otierney.net/objective-c.html, when I typed in the code that requires for Foundation/NSObject.h, the error appeared:
Fraction.h:1: fatal error: Foundation/NSObject.h: No such file or directory
and i searched for the solutions, and found a proper one
gcc -o Fraction -I/usr/GNUstep/System/Library/Headers
-L/usr/GNUstep/System/Library/Libraries
Fraction.m
-ldl
-lobjc
I tried this, but I found that I cannot find Headers under the Library directory. (My folder of GNUstep is /usr/share/GNUstep).
Does anyone know how to achieve the Headers?
I installed all the dev packages related to GNUstep but still no luck.
Hope I state my question clear enough. Sorry for my English.
Try with gnustep-config
gcc `gnustep-config --objc-flags` \
`gnustep-config --objc-libs` Fraction.m -o Fraction
GNUStep uses a fairly involved set of gmake macros - I wouldn't expect a simple command-line invocation of gcc to work very well, although to be honest I haven't tried that way myself. I found Nicolo Pera's tutorial and the project's own reference page to be quite useful when learning how to write make files for use with GNUStep.
In my case, compiling SOPE on CentOS 7, installed
yum install gnustep-base-devel
This solved the problem.
In my case, I installed gnustep-base to fix this error:
yum install gnustep-base