How can my (C++) code tell if it is being compiled inside Eclipse?

Question

Background: I develop in Eclipse, and invoke the makfile from Hudson for nightly builds. I would like different values for some #ifdefs depending on whether the code is built in Eclipse or externally from the makefile.

So, something like #ifdef _Eclipse_ would be nice.

score 3 · Answer 1 · answered Jan 20 '10 at 02:50

3

You can yourself define _Eclipse_ or something else for the build you run on Eclipse.

answered Jan 20 '10 at 02:50

amit kumar

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Yikes! The bleedin' obvious staring me in the face!! But it's like one of those coding things where you have to think of the negative case. That will work. Thanks, Amit – Mawg says reinstate Monica Jan 20 '10 at 12:23

aib · Accepted Answer · 2010-01-20T03:07:38.747

1

Why would you want to pollute your code like that? (Clarification: I mean write Eclipse- or Hudson-specific code. Just pick a better macro name and define that in Eclipse or Hudson.)

I'd make seperate targets or otherwise change the build file to pass a -DECLIPSE or -DHUDSON to the preprocessor.

Or pass a parameter to make:
Project Properties -> C/C++ Build -> Build command: make CFLAGS+=-DECLIPSE

Edit: I cannot get += to work from the command line. You might want to try, inside the Makefile:

  ifeq ($(BUILT_BY), eclipse)
    CFLAGS += -D_Eclipse_
    CXXFLAGS += -D_Eclipse_
  endif

and modify eclipse's 'make command' as such: make BUILT_BY=eclipse

edited Jan 20 '10 at 03:07

answered Jan 20 '10 at 02:51

aib

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plus one for "pollute" - post another comment and I will plus one that too. That's exactly how I feel about it too. And also you other suggestions -I didn't know how to pass -D parameters to make, but never thought of omitting them by default by declaring them only in exlipse. Thnaks – Mawg says reinstate Monica Jan 20 '10 at 12:26

score 0 · Answer 3 · edited May 23 '17 at 12:13

0

Sorry, folks, but his question is answered by another ...

Passing C/C++ #defines to makefile

edited May 23 '17 at 12:13

Community

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answered Jan 21 '10 at 08:03

Mawg says reinstate Monica

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How can my (C++) code tell if it is being compiled inside Eclipse?

3 Answers3