Andrew Haley wrote:
Wei Hu writes:
> Hello,
>
> Is there a way to tell gcc to print out all the effective optimization
> flags when it compiles a C file?
> I know the manual tells you what flags are set at different
> optimization levels, but I'm still looking for an answer to my
> question because it will be useful to my project.
Yes. -fverbose-asm dumps the flags to the .s file.
Andrew.
Hi,
Sorry, if probably a bit offtopic from subj.
I've created flags lists for -O0 and -O2,
made diff (see attach) and built my project
both with -O0 and -O2 -fno-{all options marked by + in diff}.
I've expected that results(binaries) will be equal.
But they are different.
Are my expectations correct?
Or -O0 and -O2 -fno-{all options marked
by + in diff} are not the same?
Regards
Vladimir
--- O0.opts 2007-03-29 15:26:29.703125000 +0400
+++ O2.opts 2007-03-29 15:24:56.250000000 +0400
@@ -1,33 +1,78 @@
-falign-loops
-fargument-alias
-fbranch-count-reg
+-fcaller-saves
-fcommon
+-fcprop-registers
+-fcrossjumping
+-fcse-follow-jumps
+-fcse-skip-blocks
-fdata-sections
+-fdefer-pop
+-fdelete-null-pointer-checks
-fearly-inlining
-feliminate-unused-debug-types
-fexceptions
+-fexpensive-optimizations
-ffunction-cse
-ffunction-sections
+-fgcse
-fgcse-lm
+-fguess-branch-probability
-fident
+-fif-conversion
+-fif-conversion2
-finline-functions-called-once
+-fipa-pure-const
+-fipa-reference
+-fipa-type-escape
-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
+-fschedule-insns2
-fshow-column
-fsplit-ivs-in-unroller
+-fstrength-reduce
+-fstrict-aliasing
+-fthread-jumps
-ftrapping-math
+-ftree-ccp
+-ftree-ch
+-ftree-copy-prop
+-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-salias
+-ftree-sink
+-ftree-store-ccp
+-ftree-store-copy-prop
+-ftree-ter
-ftree-vect-loop-version
+-ftree-vrp
-funit-at-a-time
-fverbose-asm
-fzero-initialized-in-bss
