https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64976
Bug ID: 64976
Summary: Bootstrap fails with -O3 -fgraphite-identity
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: hete2 at gmx dot de
On my System (Ubuntu 14.04 on an Sandy-Bridge Processor) bootstrapping
gcc-5-20150201 fails with BOOT_CFLAGS= -O3 -fgraphite-identity. The output is:
/home/hete/buggcc/gcc-5-20150201/Build1/./prev-gcc/xg++
-B/home/hete/buggcc/gcc-5-20150201/Build1/./prev-gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
-I/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-I/home/hete/buggcc/gcc-5-20150201/libstdc++-v3/libsupc++
-L/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-c -DIN_GCC_FRONTEND -O3 -fgraphite-identity -pipe -gtoggle -DIN_GCC
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
-fno-common -DHAVE_CONFIG_H -I. -Ifortran -I../../gcc -I../../gcc/fortran
-I../../gcc/../include -I../../gcc/../libcpp/include
-I../../gcc/../libdecnumber -I../../gcc/../libdecnumber/bid -I../libdecnumber
-I../../gcc/../libbacktrace -o fortran/options.o -MT fortran/options.o -MMD
-MP -MF fortran/.deps/options.TPo ../../gcc/fortran/options.c
../../gcc/fortran/module.c: In Funktion »void load_omp_udrs()«:
../../gcc/fortran/module.c:4582:24: Fehler: »name« könnte in dieser Funktion
uninitialisiert verwendet werden [-Werror=maybe-uninitialized]
size_t len = strlen (name + 1);
^
/home/hete/buggcc/gcc-5-20150201/Build1/./prev-gcc/xg++
-B/home/hete/buggcc/gcc-5-20150201/Build1/./prev-gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
-I/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-I/home/hete/buggcc/gcc-5-20150201/libstdc++-v3/libsupc++
-L/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/home/hete/buggcc/gcc-5-20150201/Build1/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-c -DIN_GCC_FRONTEND -O3 -fgraphite-identity -pipe -gtoggle -DIN_GCC
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
-fno-common -DHAVE_CONFIG_H -I. -Ifortran -I../../gcc -I../../gcc/fortran
-I../../gcc/../include -I../../gcc/../libcpp/include
-I../../gcc/../libdecnumber -I../../gcc/../libdecnumber/bid -I../libdecnumber
-I../../gcc/../libbacktrace -o fortran/parse.o -MT fortran/parse.o -MMD -MP
-MF fortran/.deps/parse.TPo ../../gcc/fortran/parse.c
../../gcc/fortran/module.c: In Funktion »void read_module()«:
../../gcc/fortran/module.c:1562:7: Fehler: »n« könnte in dieser Funktion
uninitialisiert verwendet werden [-Werror=maybe-uninitialized]
if (i < 0)
^
../../gcc/fortran/module.c:4932:12: Anmerkung: »n« wurde hier deklariert
int n;
^
../../gcc/fortran/module.c:4940:41: Fehler: »comp_name« könnte in dieser
Funktion uninitialisiert verwendet werden [-Werror=maybe-uninitialized]
gcc_assert (comp_name == c->name);
^
cc1plus: Alle Warnungen werden als Fehler behandelt
make[3]: *** [fortran/module.o] Fehler 1
make[3]: *** Warte auf noch nicht beendete Prozesse...
rm cpp.pod gcov-tool.pod gcj-dbtool.pod jcf-dump.pod jv-convert.pod grmic.pod
gcov.pod gcj.pod gc-analyze.pod gfdl.pod fsf-funding.pod gij.pod gfortran.pod
gcc.pod
make[3]: Verlasse Verzeichnis '/home/hete/buggcc/gcc-5-20150201/Build1/gcc'
make[2]: *** [all-stage2-gcc] Fehler 2
make[2]: Verlasse Verzeichnis '/home/hete/buggcc/gcc-5-20150201/Build1'
make[1]: *** [stage2-bubble] Fehler 2
make[1]: Verlasse Verzeichnis '/home/hete/buggcc/gcc-5-20150201/Build1'
make: *** [bootstrap] Fehler 2
Without CFLAGS or with --enable-languages='c,c++' bootstrapping works
This is an improvement to gcc 4.9.2 where i get an ICE.
