Ok, it doesn't mention how to do this in the user guide. It doesn't say
how to do this in the FAQ. It doesn't say how to do it on the website's
how-to-contribute page. It doesn't say how to do this in the sources. I've
searched at google. I've searched at the list archive. And the GNU
standard method (CFLAGS='-g -O0' ../src/configure) doesn't work.
I found a post on the mailing list that suggests that you have to set
*three* environment variables, CFLAGS, CXXFLAGS, and LDFLAGS.
I tried it and it didn't quite work properly. My build logs are full of
stuff like...
make "AR_FLAGS=rc" "CC_FOR_BUILD=gcc" "CFLAGS=-O2 -g -O0"
"CFLAGS_FOR_BUILD=" "CFLAGS_FOR_TARGET=-O2 -g -O0" "LDFLAGS="
"LIBCFLAGS=-O2 -g -O0" "LIBCFLAGS_FOR_TARGET=-O2 -g -O0" "MAKE=make"
"MAKEINFO=makeinfo --split-size=5000000 " "PICFLAG="
"PICFLAG_FOR_TARGET=" "SHELL=/bin/sh" "EXPECT=expect"
"RUNTEST=runtest" "RUNTESTFLAGS="
"exec_prefix=/usr/build/install" "infodir=/usr/build/install/info"
"libdir=/usr/build/install/lib" "prefix=/usr/build/install"
"tooldir=/usr/build/install/i686-pc-cygwin"
"top_toollibdir=/usr/build/install/i686-pc-cygwin/lib" "AR=ar"
"AS=as" "CC=gcc -L/usr/build/obj/i686-pc-cygwin/winsup
-L/usr/build/obj/i686-pc-cygwin/winsup/cygwin
-L/usr/build/obj/i686-pc-cygwin/winsup/w32api/lib -isystem
/usr/build/src/winsup/include -isystem /usr/build/src/winsup/cygwin/include
-isystem /usr/build/src/winsup/w32api/include
-B/usr/build/obj/i686-pc-cygwin/newlib/ -isystem
/usr/build/obj/i686-pc-cygwin/newlib/targ-include -isystem
/usr/build/src/newlib/libc/include -L/usr/build/obj/ld"
"LD=/usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../../../i686-pc-cygwin/bin/ld.
exe" "LIBCFLAGS=-O2 -g -O0" "NM=nm" "PICFLAG="
"RANLIB=ranlib" "DESTDIR=" all-recursive
...where you'll see that my flags have been combined with -O2 from somewhere
else. Now this may well work, as the -O0 is after the -O2 on the command
line, and probably overrides it, but it seems a little risky in general, and
I suspect this isn't the correct way to do it, since the optimisation
settings seem to be held elsewhere and combined with the CFLAGS at a late
stage, and it's that somewhere-else that I really ought to be setting.
So my questions are: How is this supposed to be done, where is it
actually documented, and why not?
Or have I just missed something in my searches?
cheers,
DaveK
--
Can't think of a witty .sigline today....
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