https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67092
Bug ID: 67092
Summary: bootstrap failure with
CFLAGS/CXXFLAGS/BOOT_CFLAGS="-O0 -g" in running
genpreds
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
While doing a bootstrap with CFLAGS/CXXFLAGS/BOOT_CFLAGS="-O0 -g", I run into
the following problem in stage2:
...
build/genpreds: /usr/local/tools/gcc-4.7.3/lib64/libstdc++.so.6: version
`GLIBCXX_3.4.21' not found (required by build/genpreds)
build/genpreds: /usr/local/tools/gcc-4.7.3/lib64/libstdc++.so.6: version
`CXXABI_1.3.9' not found (required by build/genpreds)
make[3]: *** [s-constrs-h] Error 1
...
While building stage2 genpreds, we link in the stage1 libstdc++ libs:
...
obj/gcc-mainline-0-x86_64-unknown-linux-gnu-x86_64-unknown-linux-gnu/./prev-gcc/xg++
-Bobj/gcc-mainline-0-x86_64-unknown-linux-gnu-x86_64-unknown-linux-gnu/./prev-gcc/
-Binstall/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-Bobj/gcc-mainline-0-x86_64-unknown-linux-gnu-x86_64-unknown-linux-gnu/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-Bobj/gcc-mainline-0-x86_64-unknown-linux-gnu-x86_64-unknown-linux-gnu/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-Iobj/gcc-mainline-0-x86_64-unknown-linux-gnu-x86_64-unknown-linux-gnu/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
-Iobj/gcc-mainline-0-x86_64-unknown-linux-gnu-x86_64-unknown-linux-gnu/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-Isrc/gcc-mainline/libstdc++-v3/libsupc++
-Lobj/gcc-mainline-0-x86_64-unknown-linux-gnu-x86_64-unknown-linux-gnu/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-Lobj/gcc-mainline-0-x86_64-unknown-linux-gnu-x86_64-unknown-linux-gnu/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-g -O0 -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 -DGENERATOR_FILE -fno-PIE -no-pie -o build/genpreds
build/genpreds.o build/rtl.o build/read-rtl.o build/ggc-none.o build/vec.o
build/min-insn-modes.o build/gensupport.o build/print-rtl.o build/hash-table.o
build/read-md.o build/errors.o .././libiberty/libiberty.a
...
But while running genpreds, we use the libstdc++ from the system, or in this
case the one found in LD_LIBRARY_PATH, which doesn't provide the version that
was linked against, and genpreds fails to load.
