------- Comment #5 from sdack at gmx dot de 2007-02-16 19:03 -------
What I now did was the following: I set CFLAGS, CXXFLAGS, LIBCFLAGS,
LIBCXXFLAGS and BOOT_CFLAGS on the command line to make to:
"-pipe -march=athlon-xp -msse -mmmx -m3dnow -mfpmath=sse -O3
-mpreferred-stack-boundary=6 -falign-functions=64 -falign-jumps=64
-fomit-frame-pointer -fforce-addr -fno-keep-static-consts -fgcse-sm -fgcse-las
-fgcse-after-reload -floop-optimize2 -fsched2-use-superblocks
-ftree-loop-linear -ftree-loop-im -ftree-loop-ivcanon -fivopts -ftree-vectorize
-ftracer -fsplit-ivs-in-unroller -fvariable-expansion-in-unroller
-freorder-blocks-and-partition"
I want to do this to see what I get as a result. I then get during the first
build of libcpp this:
...
make[3]: Entering directory `/home/sven/obj/stage1-libcpp'
gcc -I../../gcc-4.1.2/libcpp -I. -I../../gcc-4.1.2/libcpp/../include
-I../../gcc-4.1.2/libcpp/include -g -W -Wall -Wwrite-strings
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
-Wmissing-format-attribute -pedantic -Wno-long-long -I../../gcc-4.1.2/libcpp
-I. -I../../gcc-4.1.2/libcpp/../include -I../../gcc-4.1.2/libcpp/include -c -o
charset.o -MT charset.o -MD -MP -MF .deps/charset.Po
../../gcc-4.1.2/libcpp/charset.c
...
None of the flags I passed are being used but I currently do not see a reason
why they should not.
Later on libgcc:
...
/home/sven/obj/./gcc/xgcc -B/home/sven/obj/./gcc/
-B/home/sven/gnu/i686-pc-linux-gnu/bin/ -B/home/sven/gnu/i686-pc-linux-gnu/lib/
-isystem /home/sven/gnu/i686-pc-linux-gnu/include -isystem
/home/sven/gnu/i686-pc-linux-gnu/sys-include -O2 -O2 -pipe -march=athlon-xp
-msse -mmmx -m3dnow -mfpmath=sse -O3 -mpreferred-stack-boundary=6
-falign-functions=64 -falign-jumps=64 -fomit-frame-pointer -fforce-addr
-fno-keep-static-consts -fgcse-sm -fgcse-las -fgcse-after-reload
-floop-optimize2 -fsched2-use-superblocks -ftree-loop-linear -ftree-loop-im
-ftree-loop-ivcanon -fivopts -ftree-vectorize -ftracer -fsplit-ivs-in-unroller
-fvariable-expansion-in-unroller -freorder-blocks-and-partition -DIN_GCC -W
-Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -isystem ./include -I. -I. -I../../gcc-4.1.2/gcc
-I../../gcc-4.1.2/gcc/. -I../../gcc-4.1.2/gcc/../include
-I../../gcc-4.1.2/gcc/../libcpp/include -g0 -finhibit-size-directive
-fno-inline-functions -fno-exceptions -fno-zero-initialized-in-bss
-fno-unit-at-a-time -fno-omit-frame-pointer \
-c ../../gcc-4.1.2/gcc/crtstuff.c -DCRT_BEGIN \
-o crtbegin.o
...
All flags are now being used but also a "-O2 -O2" shows up. That is no problem
at all but could get cleaned out anyway. Next, again libcpp but during the
first stage:
...
make[3]: Entering directory `/home/sven/obj/stageprofile-libcpp'
/home/sven/obj/./prev-gcc/xgcc -B/home/sven/obj/./prev-gcc/
-B/home/sven/gnu/i686-pc-linux-gnu/bin/ -I../../gcc-4.1.2/libcpp -I.
-I../../gcc-4.1.2/libcpp/../include -I../../gcc-4.1.2/libcpp/include -O2 -g
-fomit-frame-pointer -fprofile-generate -W -Wall -Wwrite-strings
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
-Wmissing-format-attribute -pedantic -Wno-long-long -Werror
-I../../gcc-4.1.2/libcpp -I. -I../../gcc-4.1.2/libcpp/../include
-I../../gcc-4.1.2/libcpp/include -c -o charset.o -MT charset.o -MD -MP -MF
.deps/charset.Po ../../gcc-4.1.2/libcpp/charset.c
...
Now there is a "-O2 -g -fomit-frame-pointer" but again none of my flags. In any
case that should be identical to the first build of libcpp, shouldn't it? Next
is another build of libgcc:
...
/home/sven/obj/./gcc/xgcc -B/home/sven/obj/./gcc/
-B/home/sven/gnu/i686-pc-linux-gnu/bin/ -B/home/sven/gnu/i686-pc-linux-gnu/lib/
-isystem /home/sven/gnu/i686-pc-linux-gnu/include -isystem
/home/sven/gnu/i686-pc-linux-gnu/sys-include -O2 -O2 -pipe -march=athlon-xp
-msse -mmmx -m3dnow -mfpmath=sse -O3 -mpreferred-stack-boundary=6
-falign-functions=64 -falign-jumps=64 -fomit-frame-pointer -fforce-addr
-fno-keep-static-consts -fgcse-sm -fgcse-las -fgcse-after-reload
-floop-optimize2 -fsched2-use-superblocks -ftree-loop-linear -ftree-loop-im
-ftree-loop-ivcanon -fivopts -ftree-vectorize -ftracer -fsplit-ivs-in-unroller
-fvariable-expansion-in-unroller -freorder-blocks-and-partition -DIN_GCC -W
-Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -isystem ./include -I. -I. -I../../gcc-4.1.2/gcc
-I../../gcc-4.1.2/gcc/. -I../../gcc-4.1.2/gcc/../include
-I../../gcc-4.1.2/gcc/../libcpp/include -g0 -finhibit-size-directive
-fno-inline-functions -fno-exceptions -fno-zero-initialized-in-bss
-fno-unit-at-a-time -fno-omit-frame-pointer \
-c ../../gcc-4.1.2/gcc/crtstuff.c -DCRT_BEGIN \
-o crtbegin.o
...
This again includes a "-O2 -O2".
The first time it appears to be working the way I think it should is here:
...
make[3]: Entering directory `/home/sven/obj/stagefeedback-libiberty'
if [ x"" != x ] && [ ! -d pic ]; then \
mkdir pic; \
else true; fi
touch stamp-picdir
if [ x"" != x ]; then \
/home/sven/obj/./prev-gcc/xgcc -B/home/sven/obj/./prev-gcc/
-B/home/sven/gnu/i686-pc-linux-gnu/bin/ -c -DHAVE_CONFIG_H -pipe
-march=athlon-xp -msse -mmmx -m3dnow -mfpmath=sse -O3
-mpreferred-stack-boundary=6 -falign-functions=64 -falign-jumps=64
-fomit-frame-pointer -fforce-addr -fno-keep-static-consts -fgcse-sm -fgcse-las
-fgcse-after-reload -floop-optimize2 -fsched2-use-superblocks
-ftree-loop-linear -ftree-loop-im -ftree-loop-ivcanon -fivopts -ftree-vectorize
-ftracer -fsplit-ivs-in-unroller -fvariable-expansion-in-unroller
-freorder-blocks-and-partition -I. -I../../gcc-4.1.2/libiberty/../include -W
-Wall -pedantic -Wwrite-strings -Wstrict-prototypes
../../gcc-4.1.2/libiberty/regex.c -o pic/regex.o; \
else true; fi
...
All flags are being used without conflicting or clobbering with other flags.
Next is another libcpp build:
...
make[3]: Entering directory `/home/sven/obj/stagefeedback-libcpp'
/home/sven/obj/./prev-gcc/xgcc -B/home/sven/obj/./prev-gcc/
-B/home/sven/gnu/i686-pc-linux-gnu/bin/ -I../../gcc-4.1.2/libcpp -I.
-I../../gcc-4.1.2/libcpp/../include -I../../gcc-4.1.2/libcpp/include -O2 -g
-fomit-frame-pointer -fprofile-use -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute
-pedantic -Wno-long-long -Werror -I../../gcc-4.1.2/libcpp -I.
-I../../gcc-4.1.2/libcpp/../include -I../../gcc-4.1.2/libcpp/include -c -o
charset.o -MT charset.o -MD -MP -MF .deps/charset.Po
../../gcc-4.1.2/libcpp/charset.c
...
Again a "-O2 -g -fomit-frame-pointer" which was not been given to make but must
be coming from the Makefiles themselves appears. Same happens when the profiles
are being used:
...
/home/sven/obj/./prev-gcc/xgcc -B/home/sven/obj/./prev-gcc/
-B/home/sven/gnu/i686-pc-linux-gnu/bin/ -c -O2 -g -fomit-frame-pointer
-fprofile-use -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -pedantic -Wno-long-long -Wno-variadic-macros
-Wold-style-definition -Wmissing-format-attribute -Werror -DHAVE_CONFIG_H
-DGENERATOR_FILE -I. -Ibuild -I../../gcc-4.1.2/gcc -I../../gcc-4.1.2/gcc/build
-I../../gcc-4.1.2/gcc/../include -I../../gcc-4.1.2/gcc/../libcpp/include -o
build/genmodes.o ../../gcc-4.1.2/gcc/genmodes.c
...
It continues with:
...
/home/sven/obj/./gcc/xgcc -shared-libgcc -B/home/sven/obj/./gcc
-nostdinc++ -L/home/sven/obj/i686-pc-linux-gnu/libstdc++-v3/src
-L/home/sven/obj/i686-pc-linux-gnu/libstdc++-v3/src/.libs
-B/home/sven/gnu/i686-pc-linux-gnu/bin/ -B/home/sven/gnu/i686-pc-linux-gnu/lib/
-isystem /home/sven/gnu/i686-pc-linux-gnu/include -isystem
/home/sven/gnu/i686-pc-linux-gnu/sys-include -Winvalid-pch -Wno-deprecated -x
c++-header -pipe -march=athlon-xp -msse -mmmx -m3dnow -mfpmath=sse -O3
-mpreferred-stack-boundary=6 -falign-functions=64 -falign-jumps=64
-fomit-frame-pointer -fforce-addr -fno-keep-static-consts -fgcse-sm -fgcse-las
-fgcse-after-reload -floop-optimize2 -fsched2-use-superblocks
-ftree-loop-linear -ftree-loop-im -ftree-loop-ivcanon -fivopts -ftree-vectorize
-ftracer -fsplit-ivs-in-unroller -fvariable-expansion-in-unroller
-freorder-blocks-and-partition -D_GNU_SOURCE
-I/home/sven/obj/i686-pc-linux-gnu/libstdc++-v3/include/i686-pc-linux-gnu
-I/home/sven/obj/i686-pc-linux-gnu/libstdc++-v3/include
-I/home/sven/gcc-4.1.2/libstdc++-v3/libsupc++
/home/sven/gcc-4.1.2/libstdc++-v3/include/stdc++.h -O0 -g -o
./i686-pc-linux-gnu/bits/stdc++.h.gch/O0g.gch; \
...
Here all my flags are being used and then get clobbered by a -O0. Just one line
after this I get:
/home/sven/obj/./gcc/xgcc -shared-libgcc -B/home/sven/obj/./gcc
-nostdinc++ -L/home/sven/obj/i686-pc-linux-gnu/libstdc++-v3/src
-L/home/sven/obj/i686-pc-linux-gnu/libstdc++-v3/src/.libs
-B/home/sven/gnu/i686-pc-linux-gnu/bin/ -B/home/sven/gnu/i686-pc-linux-gnu/lib/
-isystem /home/sven/gnu/i686-pc-linux-gnu/include -isystem
/home/sven/gnu/i686-pc-linux-gnu/sys-include -Winvalid-pch -Wno-deprecated -x
c++-header -pipe -march=athlon-xp -msse -mmmx -m3dnow -mfpmath=sse -O3
-mpreferred-stack-boundary=6 -falign-functions=64 -falign-jumps=64
-fomit-frame-pointer -fforce-addr -fno-keep-static-consts -fgcse-sm -fgcse-las
-fgcse-after-reload -floop-optimize2 -fsched2-use-superblocks
-ftree-loop-linear -ftree-loop-im -ftree-loop-ivcanon -fivopts -ftree-vectorize
-ftracer -fsplit-ivs-in-unroller -fvariable-expansion-in-unroller
-freorder-blocks-and-partition -D_GNU_SOURCE
-I/home/sven/obj/i686-pc-linux-gnu/libstdc++-v3/include/i686-pc-linux-gnu
-I/home/sven/obj/i686-pc-linux-gnu/libstdc++-v3/include
-I/home/sven/gcc-4.1.2/libstdc++-v3/libsupc++
/home/sven/gcc-4.1.2/libstdc++-v3/include/stdc++.h -O2 -g -o
./i686-pc-linux-gnu/bits/stdc++.h.gch/O2g.gch;
...
Here it is a "-O2" which clobbers my flags. Another interesting case is then:
...
make[4]: Entering directory `/home/sven/obj/i686-pc-linux-gnu/libmudflap'
if /bin/sh ./libtool --mode=compile /home/sven/obj/./gcc/xgcc
-B/home/sven/obj/./gcc/ -B/home/sven/gnu/i686-pc-linux-gnu/bin/
-B/home/sven/gnu/i686-pc-linux-gnu/lib/ -isystem
/home/sven/gnu/i686-pc-linux-gnu/include -isystem
/home/sven/gnu/i686-pc-linux-gnu/sys-include -DHAVE_CONFIG_H -I.
-I../../../gcc-4.1.2/libmudflap -I. -Wall -ffunction-sections
-fdata-sections -O2 -pipe -march=athlon-xp -msse -mmmx -m3dnow -mfpmath=sse -O3
-mpreferred-stack-boundary=6 -falign-functions=64 -falign-jumps=64
-fomit-frame-pointer -fforce-addr -fno-keep-static-consts -fgcse-sm -fgcse-las
-fgcse-after-reload -floop-optimize2 -fsched2-use-superblocks
-ftree-loop-linear -ftree-loop-im -ftree-loop-ivcanon -fivopts -ftree-vectorize
-ftracer -fsplit-ivs-in-unroller -fvariable-expansion-in-unroller
-freorder-blocks-and-partition -MT mf-runtime.lo -MD -MP -MF
".deps/mf-runtime.Tpo" -c -o mf-runtime.lo
../../../gcc-4.1.2/libmudflap/mf-runtime.c; \
then mv -f ".deps/mf-runtime.Tpo" ".deps/mf-runtime.Plo"; else rm -f
".deps/mf-runtime.Tpo"; exit 1; fi
...
Here the compiler gets "-ffunction-sections -fdata-sections -O2" prepended.
AFAIK the first two flags currently only make sense on Suns where the linker
can actually use that information (according to the manpage). So why do I see
them on my i686-pc-linux box?
At the end it however has build its executables and I can do a "make install"
and it will all get installed. It just does not make alot of sense this way.
What arguments can I pass and why are they not always being used? This was now
just for "profiledbootstrap" and I believe it is just as strange when doing a
normal bootstrap.
I also sometimes see messages like:
file gcov.gcda not found, execution counts estimated
Some compiles with "-fprofile-use" cannot find their profile. Might be just
normal but should it be like that? Either "-fprofile-use" should not be used at
all in these cases or it is a bug or the profile got lost somehow.
Btw, I have set the severity of this report to "trivial" but now found that it
got set to "normal". I do not mind you raising the severity but I do get a
working compiler in the end. Please do not let this stand in your way folks, I
still think it is trivial. Sorry when I've got nothing really severe for you
*snicker*.
Sven
--
sdack at gmx dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |trivial
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30810
