In trunk revision 144629 there is a large size discrepancy of _installed_
gcc depending on first part of triplet when building Multi-lib which is
neither explained by size of executables nor differencing of the directories.
To reproduce (on Debian Lenny 5.0):
1. Boot 32-Bit using Grub entry "Debian GNU/Linux, kernel 2.6.xx-i386":
2. Configure and build gcc like this:
# gcc/xgcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc_trunk/configure --prefix=/mnt/drive2/gcc_installed
--enable-languages=c,ada,c++,fortran,java,objc,obj-c++ --enable-multilib
--disable-stage1-checking --enable-checking=release --with-gmp=/usr/local
--with-mpfr=/usr/local
3. Boot 64-Bit using Grub entry "Debian GNU/Linux, kernel 2.6.xx-amd64":
4. Configure and build gcc like this:
# gcc/xgcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc_trunk/configure --prefix=/mnt/drive2/gcc_installed_64
--enable-languages=c,ada,c++,fortran,java,objc,obj-c++ --enable-multilib
--disable-stage1-checking --enable-checking=release --with-gmp=/usr/local
--with-mpfr=/usr/local
5. Note that only the "--prefix" (and Boot Mode) is changed. Now
check the sizes on the installed directories, see a BIG difference:
# du -ah /mnt/drive2/gcc_build/ | tail -1
2.4G
# du -ah /mnt/drive2/gcc_installed/ | tail -1
541M
# du -ah /mnt/drive2/gcc_build_64/ | tail -1
3.9G /mnt/drive2/gcc_build_64/
# du -ah /mnt/drive2/gcc_installed_64/ | tail -1
931M /mnt/drive2/gcc_installed_64/
6. Check why the installed sizes are so different:
# find /mnt/drive2/gcc_installed/ | sort > list_gcc_installed.txt
# find /mnt/drive2/gcc_installed_64/ | sort > list_gcc_installed_64.txt
# diff -Naur list_gcc_installed.txt list_gcc_installed_64.txt >
list_gcc_installed_32vs64.txt
7. Now use Gedit (or other editor) to match up the directories and
check why the sizes are so different. It seems that even though
we use "--enable-multilib" we do not build the same alternate
libraries in both Modes, we are lazier in the 32-Bit Mode.
8. The result is this:
When we build gcc, with the OS in the 64-Bit Boot Mode, we also
build a couple of "32" directories (but not others that maybe we
should build).
When we build gcc, with the OS in the 32-Bit Boot Mode, we fail
to build some "64" directories and this results in an incomplete
"Multilib-version" of gcc.
I am not confused that a few more features are available in one Boot
Mode or the other, nor that the size of the executables are going to
be different, this has been taken into consideration.
I examined the 'diffs' and see that we are building a
"x86_64-pc-linux-gnu/32/bits" directory but no corresponding
"i686-pc-linux-gnu/64/bits" directory.
I examined the 'diffs' and see that we are building a
"x86_64-pc-linux-gnu/4.4.0/32" directory but no corresponding
"i686-pc-linux-gnu/4.4.0/32" directory.
The "x86_64-pc-linux-gnu/4.4.0/32/" directory ONLY contains:
"x86_64-pc-linux-gnu/4.4.0/32/adainclude/*"
"x86_64-pc-linux-gnu/4.4.0/32/adalib/*"
"x86_64-pc-linux-gnu/4.4.0/32/crt*" and these _few_ files:
"x86_64-pc-linux-gnu/4.4.0/32/libgcc.a"
"x86_64-pc-linux-gnu/4.4.0/32/libgcc_eh.a"
"x86_64-pc-linux-gnu/4.4.0/32/libgcov.a"
"x86_64-pc-linux-gnu/4.4.0/32/libgfortranbegin.a"
"x86_64-pc-linux-gnu/4.4.0/32/libgfortranbegin.la"
where are the rest (of the libraries and alternate directories)
for the multilibs on Platform "i686-pc-linux-gnu" ?
See the attachment.
Rob
--
Summary: trunk revision 144629 - Multilibs missing
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: bootstrap
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rob1weld at aol dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39388
