[openib-general] respect CFLAGS in OSM

[Eitan Zahavi]

> 
> Actually I'm not sure about this. I too see both but can't tell which
> was honored and didn't see the specific text in gcc to indicate the
> precedence here. Is it first option or last option of the same or
> something else ?
[EZ] This is exactly why I have added the traces from running gcc with
the two options.
If you look just below you will see the verbose report from cc1 showing
that the last option wins by showing the exact list of optimization
options used by the compiler. I have tested that on multiple gcc
versions. (The command line itself is reported when you run gcc -v. Then
you need to remove the -quite flag to get the correct level of
verbosity. )
> > >
> > >
swlab25:/home/eitan/SW/work/examples>/usr/libexec/gcc/i386-redhat-linux/
> > > 4.0.0/cc1 getHostName.c getHostName.c -auxbase getHostName -O0 -O2
> > > -version -o /tmp/ccet3OkS.s
> > > GNU C version 4.0.0 20050519 (Red Hat 4.0.0-8) (i386-redhat-linux)
> > >         compiled by GNU C version 4.0.0 20050519 (Red Hat
4.0.0-8).
> > > GGC heuristics: --param ggc-min-expand=99 --param
> > > ggc-min-heapsize=129317
> > > options passed:  -auxbase -O0 -O2
> > > options enabled:  -falign-loops -fargument-alias
-fbranch-count-reg
> > >  -fcaller-saves -fcommon -fcprop-registers -fcrossjumping
> > >  -fcse-follow-jumps -fcse-skip-blocks -fdefer-pop
> > >  -fdelete-null-pointer-checks -feliminate-unused-debug-types
> > >  -fexpensive-optimizations -fforce-mem -ffunction-cse -fgcse
-fgcse-lm
> > >  -fguess-branch-probability -fident -fif-conversion
-fif-conversion2
> > >  -fivopts -fkeep-static-consts -fleading-underscore
-floop-optimize
> > >  -floop-optimize2 -fmath-errno -fmerge-constants
> > > -foptimize-register-move
> > >  -foptimize-sibling-calls -fpcc-struct-return -fpeephole
-fpeephole2
> > >  -fregmove -freorder-blocks -freorder-functions
-frerun-cse-after-loop
> > >  -frerun-loop-opt -fsched-interblock -fsched-spec
> > > -fsched-stalled-insns-dep
> > >  -fsplit-ivs-in-unroller -fstrength-reduce -fstrict-aliasing
> > > -fthread-jumps
> > >  -ftrapping-math -ftree-ccp -ftree-ch -ftree-copyrename -ftree-dce
> > >  -ftree-dominator-opts -ftree-dse -ftree-fre -ftree-loop-im
> > >  -ftree-loop-ivcanon -ftree-loop-optimize -ftree-lrs -ftree-pre
> > > -ftree-sra
> > >  -ftree-ter -funit-at-a-time -fvar-tracking
-fzero-initialized-in-bss
> > >  -m80387 -mhard-float -mno-soft-float -mieee-fp -mfp-ret-in-387
> > >  -mno-red-zone -mtls-direct-seg-refs -mtune=i386 -march=i386
> > >
> > >
swlab25:/home/eitan/SW/work/examples>/usr/libexec/gcc/i386-redhat-linux/
> > > 4.0.0/cc1 getHostName.c getHostName.c -auxbase getHostName -O2 -O0
> > > -version -o /tmp/ccet3OkS.s
> > > GNU C version 4.0.0 20050519 (Red Hat 4.0.0-8) (i386-redhat-linux)
> > >         compiled by GNU C version 4.0.0 20050519 (Red Hat
4.0.0-8).
> > > GGC heuristics: --param ggc-min-expand=99 --param
> > > ggc-min-heapsize=129317
> > > options passed:  -auxbase -O2 -O0
> > > options enabled:  -falign-loops -fargument-alias
-fbranch-count-reg
> > >  -fcommon -feliminate-unused-debug-types -ffunction-cse -fgcse-lm
> > > -fident
> > >  -fivopts -fkeep-static-consts -fleading-underscore
-floop-optimize2
> > >  -fmath-errno -fpcc-struct-return -fpeephole -fsched-interblock
> > >  -fsched-spec -fsched-stalled-insns-dep -fsplit-ivs-in-unroller
> > >  -ftrapping-math -ftree-loop-im -ftree-loop-ivcanon
-ftree-loop-optimize
> > >  -funit-at-a-time -fvar-tracking -fzero-initialized-in-bss -m80387
> > >  -mhard-float -mno-soft-float -mieee-fp -mfp-ret-in-387
-mno-red-zone
> > >  -mtls-direct-seg-refs -mtune=i386 -march=i386
> > >