Program g++ not found in path in eclipse juno cdt in ubuntu

Question

How do I fix this please? I am new to Linux.

Did you install g++? Also, in eclipse you may have to set the compiler path in preferences.

bobestm · Accepted Answer · 2012-10-08 03:10:32Z

Typically, g++ will be installed when gcc (GNU Compiler Collection) is installed. First confirm that you have g++ installed.

You can check this by typing the following in a terminal: which g++. The response ought to be /usr/bin/g++.

If you find g++ installed, in eclipse go to project->properties->C/C++ Build->Discovery Options, under tools GCC C++ Compiler, put the exact path to g++ instead of g++ (if g++ alone does not work).

You will find this link useful: What is the difference between g++ and gcc?

If you still have problems, do get back with feedback.

version option gives me "g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3"
I set "compiler invocation command" into the exact path.nothing changes. also,is there a fix that does fixing for all projects instead of one?
So it clear that you have g++ installed on the box. This points to the path not being correct in eclipse. Try adding the path variable to the evironment here: window->preferences->C/C++->build->Environment.

Gregor · Answer 2 · 2013-07-27 07:52:53Z

I have exactly the same problem. I never had problems with eclipse before under linux and now it wont even compile code. I tried to change the name of the g++ and gcc compilers to their exact location in project->properties->c/c++ Build->discovery options etc. nothing helped, I tried to reinstall eclipse and did an initialize, added the path to the variables etc.. Nothing worked so fare. The project I am working on is quiet big and I rather would like eclipse to manage the source and makefile, instead of doing it manually

Linux Mint 15 Eclispe: Version: 3.8.1 (I tried it with the latest version as well ... nothing changed)

g++ --version g++ (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3 Copyright (C) 2012 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

gcc --version gcc (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3 Copyright (C) 2012 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

example:

#include // not resolved using namespace std;

int main() {
    std::cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
    return 0;
}

Well the code above is not what bothers me, as I can fix it by adding the includes of the exact c++ include path, but the code just wont compile. Wired enough eclipse gives me the error:

Description Resource Path Location Type Program "g++" not found in PATH Preferences, C++/Build/Settings/Discovery, [CDT GCC Builtin Compiler Settings] options C/C++ Scanner Discovery Problem

but it appears to me to be possible to compile single files, by opening them and pressing crt+b, but the whole project wont compile.

Fixed the problem this morning:
- got the latest eclipse
- created a new workspace
- created a new project

after a few seconds the very same error disappears

score 0 · Answer 3

I had similar problem and it is solved by

Installing g++ The GNU C++ complier using ubuntu software centre and
Changing in -
Window -> Preferences -> C/C++ -> Build -> Settings -> Discovery -> CDT GCC Build in Complier Settings [Shared]
From: ${COMMAND} -E -P -v -dD "${INPUTS}"
To: /usr/bin/${COMMAND} -E -P -v -dD "${INPUTS}"

I hope it helps. I think if you add it to the project as mentioned in the first answer, you will need to add all the time for new projects. And if you add as I wrote you don't need to add it for new projects.

score 167 · Accepted Answer · 2008-10-06 00:21:32Z

gcc is 'Gnu Compiler Collection'. If you pass it a C++ file, it will invoke the C++ compiler ('g++') behind the scenes.

gcc is essentially the frontend for several compilers and the linker too.

Edit: As several people pointed out, this doesn't mean that 'gcc' and 'g++' are interchangeable for c++ files: gcc will invoke g++ with different arguments to what you'd get if you'd invoked g++ directly.

@Brian: I spend several years thinking that 'gpp' was the C++ backend...
gcc used to mean 'Gnu C Compiler'. That eventually changed when more languages were added.
That's not entirely true. If you just run gcc on a C++ file, it will not 'just work' like g++ does. That's because it won't automatically link to the C++ std library, etc. Just use g++ for C++ files.
The actual compiler is "cc1" for C and "cc1plus" for C++; both gcc and g++ are drivers (which call the preprocessor/compiler/assembler/linker as needed).

Loki Astari · Answer 5 · 2008-10-06 01:55:00Z

GCC: GNU Compiler Collection

Referrers to all the different languages that are supported by the GNU compiler.

gcc: GNU C Compiler
g++: GNU C++ Compiler

The main differences:

gcc will compile: *.c/*.cpp files as C and C++ respectively.
g++ will compile: *.c/*.cpp files but they will all be treated as C++ files.
Also if you use g++ to link the object files it automatically links in the std C++ libraries (gcc does not do this).
gcc compiling C files has less predefined macros.
gcc compiling *.cpp and g++ compiling *.c/*.cpp files has a few extra macros.

Extra Macros when compiling *.cpp files:

#define __GXX_WEAK__ 1
#define __cplusplus 1
#define __DEPRECATED 1
#define __GNUG__ 4
#define __EXCEPTIONS 1
#define __private_extern__ extern

You can link the std C++ library in gcc by passing -lstdc++ parameter.
There are more differences between 'gcc' and 'g++' than only the standard libraries, so gcc -lstdc++ will still not get you the same behavior as g++. We put all of that language-specific behavior into its own driver for a reason, that's what it's there for. :-)
@TiStrga: You did not read the answer very carefully. Denilson is basically correct as he is only taking about the linking phase.
My comment isn't talking about just linking... that's the point. Even just restricting the discussion to linking (which your answer was not), a user still won't be able to use the entire C++ standard library by only specifying -lstdc++, as there will be missing dependencies on math, RTTI, and exception information. Whether a given test case links or fails will depend on the operating system and which C++ features are used by the test case, which again is why all of that knowledge is built into the g++ driver instead of being left up to the user to figure out.
Trust me, we have this discussion a lot, usually when a Linux user tries to move his incomplete Makefile to another platform. :-) The g++ link stage does a lot more than gcc -lstdc++ on other OSes, especially when the target is an embedded platform. Fortunately, that's why we ship a g++ in the first place.

Nils Pipenbrinck · Answer 6 · 2008-10-05 20:29:26Z

For c++ you should use g++.

It's the same compiler (e.g. the GNU compiler collection). GCC or G++ just choose a different front-end with different default options.

In a nutshell: if you use g++ the frontend will tell the linker that you may want to link with the C++ standard libraries. The gcc frontend won't do that (also it could link with them if you pass the right command line options).

zaphod · Answer 7 · 2008-10-06 00:51:10Z

Although the gcc and g++ commands do very similar things, g++ is designed to be the command you'd invoke to compile a C++ program; it's intended to automatically do the right thing.

Behind the scenes, they're really the same program. As I understand, both decide whether to compile a program as C or as C++ based on the filename extension. Both are capable of linking against the C++ standard library, but only g++ does this by default. So if you have a program written in C++ that doesn't happen to need to link against the standard library, gcc will happen to do the right thing; but then, so would g++. So there's really no reason not to use g++ for general C++ development.

njsf · Answer 8 · 2008-10-05 20:35:31Z

The only notable difference is that i you pass a .c to gcc it will compile as C, whereas g++ will always treat it as C++

Minh Triet Pham Tran · Answer 9 · 2012-10-18 11:37:16Z

“GCC” is a common shorthand term for the GNU Compiler Collection. This is both the most general name for the compiler, and the name used when the emphasis is on compiling C programs (as the abbreviation formerly stood for “GNU C Compiler”).

When referring to C++ compilation, it is usual to call the compiler “G++”. Since there is only one compiler, it is also accurate to call it “GCC” no matter what the language context; however, the term “G++” is more useful when the emphasis is on compiling C++ programs.

You could read more here: http://gcc.gnu.org/onlinedocs/gcc-3.3.5/gcc/G_002b_002b-and-GCC.html

theunamedguy · Answer 10 · 2013-06-15 00:36:46Z

gcc is the GNU C Compiler you should not use it to compile a C++ program, because it will give a linking error, that it can't link with the C++ standard library. g++, however, is the C++ frontend to gcc, and automatically links with the C++ standard library. GCC stands for the GNU Compiler Collection, which includes both the C and C++ compilers (gcc and g++), and some other ones, including Fortran and Java (gfortran and gcj).

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Program g++ not found in path in eclipse juno cdt in ubuntu

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