Ada in gcc-4.2.3 does not build with a pre-existing Ada build from gcc-3.4.3: $ bzip2 -dc gcc-4.2.3.tar.bz2 | tar xf - $ mkdir gcc-4.2.3-objdir $ cd gcc-4.2.3-objdir $ LIBPATH=/opt/TWWfsw/libgmp42/lib:/opt/TWWfsw/libmpfr22/lib CC=gcc bash /opt/build/china/gcc-4.2.3/configure --enable-nls --with-included-gettext --enable-shared --enable-threads --with-gmp=/opt/TWWfsw/libgmp42 --with-mpfr=/opt/TWWfsw/libmpfr23 --enable-languages="c,ada" ... $ LIBPATH=/opt/TWWfsw/libgmp42/lib:/opt/TWWfsw/libmpfr22/lib gmake bootstrap ... /opt/build/china/gcc-4.2.3-objdir/./prev-gcc/xgcc -B/opt/build/china/gcc-4.2.3-objdir/./prev-gcc/ -B/usr/local/powerpc-ibm-aix5.1.0.0/bin/ -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition -Wmissing-format-attribute -DHAVE_CONFIG_H -Wl,-bbigtoc gcov-dump.o version.o errors.o ../libcpp/libcpp.a ./../intl/libintl.a -liconv ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a -o gcov-dump /opt/build/china/gcc-4.2.3-objdir/./prev-gcc/xgcc -B/opt/build/china/gcc-4.2.3-objdir/./prev-gcc/ -B/usr/local/powerpc-ibm-aix5.1.0.0/bin/ -c -g -O2 -mminimal-toc -I- -I. -Iada -I/opt/build/china/gcc-4.2.3/gcc/ada /opt/build/china/gcc-4.2.3/gcc/ada/ada.ads -o ada/ada.o ada.ads:16:01: language defined units may not be recompiled
-- Summary: Ada not building on gcc-4.2.3 Product: gcc Version: 4.2.3 Status: UNCONFIRMED Severity: normal Priority: P3 Component: ada AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: bugzilla-gcc at thewrittenword dot com GCC build triplet: powerpc-ibm-aix5.1.0.0 GCC host triplet: powerpc-ibm-aix5.1.0.0 GCC target triplet: powerpc-ibm-aix5.1.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35155