Building gcc with "-O -g"?

Building gcc with "-O -g"?

[Steve Kargl]

So, how does one biulding all parts of gcc with "-O -g"?

In my shell script, I have

CFLAGS="-O -g"
export CFLAGS

CXXFLAGS="-O -g"
export CXXFLAGS

BOOT_CFLAGS="-O -g"
export BOOT_CFLAGS

../gcc/configure --prefix=$HOME/work --enable-languages=c,c++,fortran \
  --enable-bootstrap --disable-libssp --disable-multilib

but during bootstrap I see

/home/kargl/gcc/obj/./prev-gcc/xg++ -B/home/kargl/gcc/obj/./prev-gcc/ -B/home/kargl/work/x86_64-unknown-freebsd15.0/bin/ -nostdinc++ -B/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/src/.libs -B/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/libsupc++/.libs  -I/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/include/x86_64-unknown-freebsd15.0  -I/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/include  -I/home/kargl/gcc/gcc/libstdc++-v3/libsupc++ -L/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/src/.libs -L/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/libsupc++/.libs  -fno-PIE -c   -g -O2 -fno-checking -gtoggle -DIN_GCC    -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common  -DHAVE_CONFIG_H -fno-PIE -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include  -I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libcody -I/usr/local/include  -I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/dpd -I../libdecnumber -I../../gcc/gcc/../libbacktrace   -o fibonacci_heap.o -MT fibonacci_heap.o -MMD -MP -MF ./.deps/fibonacci_heap.TPo ../../gcc/gcc/fibonacci_heap.cc

Note the "-g -O2".  Why?
-- 
Steve

Re: Building gcc with "-O -g"?

[Marc Glisse]

On Sat, 10 Feb 2024, Steve Kargl via Gcc wrote:

> So, how does one biulding all parts of gcc with "-O -g"?
>
> In my shell script, I have
>
> CFLAGS="-O -g"
> export CFLAGS
>
> CXXFLAGS="-O -g"
> export CXXFLAGS
>
> BOOT_CFLAGS="-O -g"
> export BOOT_CFLAGS
>
> ../gcc/configure --prefix=$HOME/work --enable-languages=c,c++,fortran \
>  --enable-bootstrap --disable-libssp --disable-multilib
>
> but during bootstrap I see
>
> /home/kargl/gcc/obj/./prev-gcc/xg++ -B/home/kargl/gcc/obj/./prev-gcc/ -B/home/kargl/work/x86_64-unknown-freebsd15.0/bin/ -nostdinc++ -B/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/src/.libs -B/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/libsupc++/.libs  -I/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/include/x86_64-unknown-freebsd15.0  -I/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/include  -I/home/kargl/gcc/gcc/libstdc++-v3/libsupc++ -L/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/src/.libs -L/home/kargl/gcc/obj/prev-x86_64-unknown-freebsd15.0/libstdc++-v3/libsupc++/.libs  -fno-PIE -c   -g -O2 -fno-checking -gtoggle -DIN_GCC    -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common  -DHAVE_CONFIG_H -fno-PIE -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/../include  -I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libcody -I/usr/local/include  -I../../gcc/gcc/../libdecnumber -I../../gcc/gcc/../libdecnumber/dpd -I../libdecnumber -I../../gcc/gcc/../libbacktrace   -o fibonacci_heap.o -MT fibonacci_heap.o -MMD -MP -MF ./.deps/fibonacci_heap.TPo ../../gcc/gcc/fibonacci_heap.cc
>
> Note the "-g -O2".  Why?

In addition to CFLAGS and BOOT_CFLAGS, you are missing CFLAGS_FOR_TARGET 
(plus the same 3 for CXX). I don't know if that's still sufficient, but 
that's what I used to set a few years ago.

-- 
Marc Glisse

Re: Building gcc with "-O -g"?

[Steve Kargl]

On Sat, Feb 10, 2024 at 07:35:22PM +0100, Marc Glisse wrote:
> On Sat, 10 Feb 2024, Steve Kargl via Gcc wrote:
> 
> > So, how does one biulding all parts of gcc with "-O -g"?
> > 
> > In my shell script, I have
> > 
> > CFLAGS="-O -g"
> > export CFLAGS
> > 
> > CXXFLAGS="-O -g"
> > export CXXFLAGS
> > 
> > BOOT_CFLAGS="-O -g"
> > export BOOT_CFLAGS
> > 
> > ../gcc/configure --prefix=$HOME/work --enable-languages=c,c++,fortran \
> >  --enable-bootstrap --disable-libssp --disable-multilib
> > 
> > but during bootstrap I see
> > 
> > /home/kargl/gcc/obj/./prev-gcc/xg++ ... -g -O2 ...
> > 
> > Note the "-g -O2".  Why?
> 
> In addition to CFLAGS and BOOT_CFLAGS, you are missing CFLAGS_FOR_TARGET
> (plus the same 3 for CXX). I don't know if that's still sufficient, but
> that's what I used to set a few years ago.

Thanks for the pointers.  It seems that https://gcc.gnu.org/install/build.html
needs be updated.

-- 
Steve