Friday, April 24, 2015

Eclipse CDT + gdb setup

update

PATH is a per-project config, not optional.

CCB->settings->toolSettings->g++compiler->misc -> turn on verbose to see which g++.exe in use
--c++11 mingw
mingw-builds installer either errors out or was too old... I  used mingw-w64 instead

http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/4.9.2/threads-posix/dwarf/i686-4.9.2-release-posix-dwarf-rt_v4-rev2.7z/download
--
install mingw and fix %PATH%. Go to mingw\bin\ folder. In dos, verify
g++ --version // gcc is the C compiler !!
gdb --version
// copy the *make.exe to make.exe
make --version
Even without IDE, I believe mingw g++/linker can convert your c++ source into executable. Mingw is designed to be usable without IDE. Both codeBlocks and eclipse users generally favor mingw over cygwin.

(Note you need the eclipse view "C/C++ projects" to see the Binaries + related stuff)

project properties -> Builders -- I didn't change.
project properties -> c/c++ general (CCG) -- no need to change.
project properties -> c/c++ build (CCB) -- contains every important config for C++. Amidst the CCB config maze, #1 factor is tool chain ( CCB->toolChainEditor ). Eclipse often defaults to CrossGCC + CDT_InternalBuilder [3]. Leads to this Question

Q1a: is that enough? mingw unnecessary?
A: I thought "Sometimes Partially Usable", but I guess it's an illusion, and we still need mingw.

Q: does eclipse come with gdb, so we don't need to install mingw?
A: probably not. Apparently, gdb.exe must be in %PATH%

[3] To remind you which builder is in use, build console says ".... builder is used"

Now that's the preliminary. Let's zoom into compiling and debugging your project.
Q1b: does eclipse come with g++ compiler?
A: probably not. Eclipse looks for g++.exe in %PATH%, failing which it always always always fail to build.

Fix 1) First install mingw. Usually you can but sometimes can't build using default crossGCC, in which case change toolChain=mingw (usually not needed). Should build a [projectName].exe, just as msvs. Runnable in dos.

Surprise #1 -- by default, there's no debug config for your project. I think that's why you can build a good executable but can only run it in dos, not F11 -- you get BinaryNotFound. That leads to ...

Fix 2) create a debug config [2], in Run->RunConfig->c/c++App->new. Mention your [projectName].exe. If it's not recognized as IDE-runnable, You may need to mess with the CCB->Settings->binaryParser (PEWindowsParser?) and restart IDE, rebuild.... Now you can run it in IDE, but you may or may not have problem debugging it. That leads to another Fix and Q&A

Fix 3) -->
Q: Minimum effort to fix debugging?
A: CCB->ToolChainEditor->currentToolChain = mingw. You can leave InternalBuilder alone.

[2] a debugConfig is also a runConfig.

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http://www.linkedin.com/in/tanbin