https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68220
Bug ID: 68220 Summary: [5.2.1 Regression] Devirtualization ICE in record_target_from_binfo, at ipa-devirt.c:2389 Product: gcc Version: 5.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: sebastien.piat at epita dot fr Target Milestone: --- Created attachment 36653 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36653&action=edit The preprocessed file. The following piece of code causes an internal compiler error when compiled with this command line : `g++-5 -O3 -std=c++11 ice.cc`. With this version of g++-5 : Debian 5.2.1-21 and boost version 1.58. I could not find any simpler way to cause this error, as removing any of the elements of the given code solves the problem (even using symbol instead of boost::variant<symbol>). Note that it works if compiled with optimization up to -O2 or with the flag `-fno-devirtualize`. The code: #include <boost/variant/variant.hpp> struct symbol { virtual ~symbol(); }; using Identifier = boost::variant<symbol>; struct Fragment { virtual void foo() const = 0; virtual ~Fragment(); }; struct ProcFrag : Fragment { ~ProcFrag() {} virtual void foo() const override; Identifier id; }; struct Fragments { ~Fragments() { delete x; } Fragment* x; }; Fragments fragments; Fragment::~Fragment() {} The compilation output with `-v -save-temps` (I have attached the preprocessed file): Using built-in specs. COLLECT_GCC=g++-5 COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 5.2.1-21' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 5.2.1 20151003 (Debian 5.2.1-21) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-std=c++11' '-Wall' '-Werror' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/5/cc1plus -E -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE ice.cc -mtune=generic -march=x86-64 -std=c++11 -Wall -Werror -O3 -fpch-preprocess -o ice.ii ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/5" ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/5/../../../../x86_64-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/include/c++/5 /usr/include/x86_64-linux-gnu/c++/5 /usr/include/c++/5/backward /usr/lib/gcc/x86_64-linux-gnu/5/include /usr/local/include /usr/lib/gcc/x86_64-linux-gnu/5/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-std=c++11' '-Wall' '-Werror' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/5/cc1plus -fpreprocessed ice.ii -quiet -dumpbase ice.cc -mtune=generic -march=x86-64 -auxbase ice -O3 -Wall -Werror -std=c++11 -version -o ice.s GNU C++11 (Debian 5.2.1-21) version 5.2.1 20151003 (x86_64-linux-gnu) compiled by GNU C version 5.2.1 20151003, GMP version 6.0.0, MPFR version 3.1.3, MPC version 1.0.3 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C++11 (Debian 5.2.1-21) version 5.2.1 20151003 (x86_64-linux-gnu) compiled by GNU C version 5.2.1 20151003, GMP version 6.0.0, MPFR version 3.1.3, MPC version 1.0.3 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 60de134094777aef87cb5f2c7eb1a063 ice.cc:35:2: internal compiler error: in record_target_from_binfo, at ipa-devirt.c:2389 {} ^ 0x9264f0 record_target_from_binfo ../../src/gcc/ipa-devirt.c:2389 0x92616a record_target_from_binfo ../../src/gcc/ipa-devirt.c:2430 0x926894 possible_polymorphic_call_targets_1 ../../src/gcc/ipa-devirt.c:2477 0x927187 possible_polymorphic_call_targets(tree_node*, long, ipa_polymorphic_call_context, bool*, void**, bool) ../../src/gcc/ipa-devirt.c:3006 0x9281fc try_speculative_devirtualization(tree_node*, long, ipa_polymorphic_call_context) ../../src/gcc/ipa-devirt.c:3367 0xfd4d2f ipa_get_indirect_edge_target_1 ../../src/gcc/ipa-cp.c:2047 0x933ea4 estimate_edge_devirt_benefit ../../src/gcc/ipa-inline-analysis.c:3070 0x93422b estimate_edge_size_and_time ../../src/gcc/ipa-inline-analysis.c:3110 0x93422b estimate_calls_size_and_time ../../src/gcc/ipa-inline-analysis.c:3186 0x9344db estimate_node_size_and_time ../../src/gcc/ipa-inline-analysis.c:3281 0x9346e9 estimate_ipcp_clone_size_and_time(cgraph_node*, vec<tree_node*, va_heap, vl_ptr>, vec<ipa_polymorphic_call_context, va_heap, vl_ptr>, vec<ipa_agg_jump_function*, va_heap, vl_ptr>, int*, int*, int*) ../../src/gcc/ipa-inline-analysis.c:3321 0xfdb824 perform_estimation_of_a_value ../../src/gcc/ipa-cp.c:2361 0xfdc7fc estimate_local_effects ../../src/gcc/ipa-cp.c:2513 0xfdc7fc propagate_constants_topo ../../src/gcc/ipa-cp.c:2726 0xfdc7fc ipcp_propagate_stage ../../src/gcc/ipa-cp.c:2827 0xfdd98e ipcp_driver ../../src/gcc/ipa-cp.c:4487 0xfdd98e execute ../../src/gcc/ipa-cp.c:4582 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.