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RE: [cdt-dev] build question -- extra switches

Hi John,
Those -M options are preprocessor options that generate the dependency information needed to allow incremental builds.  I don't know where they're generated, because our tooling bypasses all this stuff, but it's just something I remember.
I'm not sure they'd impact the debugger or compile behavior, other than preventing unnecessary compiles, but what do I know :)
-- Ed

From: John Cortell [mailto:rat042@xxxxxxxxxxxxx]
Sent: Thursday, April 15, 2010 7:44 AM
To: cdt-dev@xxxxxxxxxxx
Subject: [cdt-dev] build question -- extra switches

Can someone familiar with the build support tell me why the compile line generated by the GNU Make Builder for a simple Cygwin or MinGW project is

    gcc -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/p1.d" -MT"src/p1.d" -o"src/p1.o" "../src/p1.c"

but the -MMD -MP -MF and -MT options don't appear in the GUI (see attached screenshot).

At least one of these options is triggering a problem for the debugger. The Internal Builder does not specify those options.

Seems odd to me that
(a) the program is built with options that the user is not informed of via the GUI
(b) the internal and make builder don't compile the source files the same way.


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