When I was using "make -j8" on an ia64 machine with 16 processors, I got
[EMAIL PROTECTED] gcc]$ grep O2g.gch nohup.out
/export/build/gnu/gcc/build-ia64-linux/./gcc/xgcc -shared-libgcc
-B/export/build/gnu/gcc/build-ia64-linux/./gcc -nostdinc++
-L/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/src
-L/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/usr/gcc-4.3/ia64-unknown-linux-gnu/bin/
-B/usr/gcc-4.3/ia64-unknown-linux-gnu/lib/ -isystem
/usr/gcc-4.3/ia64-unknown-linux-gnu/include -isystem
/usr/gcc-4.3/ia64-unknown-linux-gnu/sys-include -Winvalid-pch -Wno-deprecated
-x c++-header -g -O2 -D_GNU_SOURCE
-I/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/include/ia64-unknown-linux-gnu
-I/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/include
-I/net/gnu-13/export/gnu/src/gcc/gcc/libstdc++-v3/libsupc++ -O2 -g
/net/gnu-13/export/gnu/src/gcc/gcc/libstdc++-v3/include/precompiled/stdc++.h -o
ia64-unknown-linux-gnu/bits/stdc++.h.gch/O2g.gch
/export/build/gnu/gcc/build-ia64-linux/./gcc/xgcc -shared-libgcc
-B/export/build/gnu/gcc/build-ia64-linux/./gcc -nostdinc++
-L/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/src
-L/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/usr/gcc-4.3/ia64-unknown-linux-gnu/bin/
-B/usr/gcc-4.3/ia64-unknown-linux-gnu/lib/ -isystem
/usr/gcc-4.3/ia64-unknown-linux-gnu/include -isystem
/usr/gcc-4.3/ia64-unknown-linux-gnu/sys-include -Winvalid-pch -Wno-deprecated
-x c++-header -g -O2 -D_GNU_SOURCE
-I/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/include/ia64-unknown-linux-gnu
-I/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/include
-I/net/gnu-13/export/gnu/src/gcc/gcc/libstdc++-v3/libsupc++ -O2 -g
/net/gnu-13/export/gnu/src/gcc/gcc/libstdc++-v3/include/precompiled/stdtr1c++.h
-o ia64-unknown-linux-gnu/bits/stdtr1c++.h.gch/O2g.gch
/export/build/gnu/gcc/build-ia64-linux/./gcc/xgcc -shared-libgcc
-B/export/build/gnu/gcc/build-ia64-linux/./gcc -nostdinc++
-L/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/src
-L/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/usr/gcc-4.3/ia64-unknown-linux-gnu/bin/
-B/usr/gcc-4.3/ia64-unknown-linux-gnu/lib/ -isystem
/usr/gcc-4.3/ia64-unknown-linux-gnu/include -isystem
/usr/gcc-4.3/ia64-unknown-linux-gnu/sys-include -Winvalid-pch -Wno-deprecated
-x c++-header -g -O2 -D_GNU_SOURCE
-I/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/include/ia64-unknown-linux-gnu
-I/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/include
-I/net/gnu-13/export/gnu/src/gcc/gcc/libstdc++-v3/libsupc++ -O2 -g
/net/gnu-13/export/gnu/src/gcc/gcc/libstdc++-v3/include/precompiled/extc++.h -o
ia64-unknown-linux-gnu/bits/extc++.h.gch/O2g.gch
make[4]: *** [ia64-unknown-linux-gnu/bits/extc++.h.gch/O2g.gch] Error 1
/export/build/gnu/gcc/build-ia64-linux/./gcc/xgcc -shared-libgcc
-B/export/build/gnu/gcc/build-ia64-linux/./gcc -nostdinc++
-L/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/src
-L/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/usr/gcc-4.3/ia64-unknown-linux-gnu/bin/
-B/usr/gcc-4.3/ia64-unknown-linux-gnu/lib/ -isystem
/usr/gcc-4.3/ia64-unknown-linux-gnu/include -isystem
/usr/gcc-4.3/ia64-unknown-linux-gnu/sys-include -Winvalid-pch -Wno-deprecated
-x c++-header -g -O2 -D_GNU_SOURCE
-I/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/include/ia64-unknown-linux-gnu
-I/export/build/gnu/gcc/build-ia64-linux/ia64-unknown-linux-gnu/libstdc++-v3/include
-I/net/gnu-13/export/gnu/src/gcc/gcc/libstdc++-v3/libsupc++ -O2 -g
/net/gnu-13/export/gnu/src/gcc/gcc/libstdc++-v3/include/precompiled/extc++.h -o
ia64-unknown-linux-gnu/bits/extc++.h.gch/O2g.gch
make[6]: *** [ia64-unknown-linux-gnu/bits/extc++.h.gch/O2g.gch] Error 1
[EMAIL PROTECTED] gcc]$
That is the target, ia64-unknown-linux-gnu/bits/extc++.h.gch/O2g.gch, was
made twice at the same time and they ran into each other.
--
Summary: libstdc++ isn't parallel build safe
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hjl at lucon dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30674
