Spurious parallel make failures in libgcc.

Wed Jul 15 14:33:00 GMT 2015

Oh, wait. this isnt on a scratch build this time, this is on an 
incremental rebuild I just noticed (I was doing stuff on  multiple 
machines, turn out the other one was a scratch build)
make -j16 from the root build directory.

and it may have happened with me putzing around with a .awk file in the 
gcc which required rebuilding.. so maybe configure did require 
re-running somehow?  still seems to be a timing issue tho.

Maybe if gthr-default already existed (as well as config.status), the 
makefile would spawn the libgcov-interface.c object builds... meanwhile 
a reconfigure is going which ends up overwriting gthr-default.h at what 
turns out to be a poor time ?  that sort of makes sense I guess.   Im 
not sure how we synchronize the parallel bits.

Andrew

so it probably is related to rerunning config.status
On 07/15/2015 10:07 AM, Andrew MacLeod wrote:
> I occasionally get a build failure in libgcc when doing a scratch 
> build (onx86_64-unknown-linux-gnu) , and if I simply do another make, 
> it works fine.  I am always building with make -j16, so its never been 
> easy to spot.
>
> This morning, it happened to fail in such a way that I can sort of see 
> whats going on for a change. well I thought so anyway
>
> The problem is building libgcc.
>
> (small log snippet at the bottom)
> compilation of libgcc/libgcov-interface.c is spawned, in particular 
> (1) the _gcov_reset.o portion.
> meanwhile, a bit later, but presumably in parallel,  (2) 
> gthr-default.h is linked  to a source file.
> but too late!!!! (3), _gcov_reset has already failed looking for it.
>
> Now if I type make, everything builds to completion because the file 
> is there.
>
>
> However, as I look into it deeper, It doesn't seem to be quite that 
> simple..  Looking at the detailed dates of files in the 32 bit 
> directory (where I think it worked),  (sorted using 
> --time-style=full-iso)
> <...>
> -rw-rw-r--. 1 amacleod amacleod  8129 2015-07-15 08:57:23.745914123 
> -0400 _gcov_execvp.dep
> -rw-rw-r--. 1 amacleod amacleod  8128 2015-07-15 08:57:23.745914123 
> -0400 _gcov_execv.dep
> -rw-rw-r--. 1 amacleod amacleod  8129 2015-07-15 08:57:23.755914124 
> -0400 _gcov_execve.dep
> -rw-rw-r--. 1 amacleod amacleod  8129 2015-07-15 08:57:23.779914126 
> -0400 _gcov_execle.dep
> -rw-rw-r--. 1 amacleod amacleod 12520 2015-07-15 08:57:23.781914126 
> -0400 _gcov_execvp.o
> -rw-rw-r--. 1 amacleod amacleod 12516 2015-07-15 08:57:23.787914127 
> -0400 _gcov_execv.o
> -rw-rw-r--. 1 amacleod amacleod 12552 2015-07-15 08:57:23.823914130 
> -0400 _gcov_execve.o
> lrwxrwxrwx. 1 amacleod amacleod    39 2015-07-15 08:57:23.841914132 
> -0400 gthr-default.h -> /gcc/2015-07-14/gcc/libgcc/gthr-posix.h
> -rw-rw-r--. 1 amacleod amacleod  8129 2015-07-15 08:57:23.854914133 
> -0400 _gcov_execlp.dep
> -rw-rw-r--. 1 amacleod amacleod 13268 2015-07-15 08:57:23.860914134 
> -0400 _gcov_execle.o
> -rw-rw-r--. 1 amacleod amacleod 13216 2015-07-15 08:57:23.885914136 
> -0400 _gcov_execlp.o
> -rw-rw-r--. 1 amacleod amacleod  8128 2015-07-15 08:57:23.895914137 
> -0400 _gcov_reset.dep
> -rw-rw-r--. 1 amacleod amacleod 14184 2015-07-15 08:57:23.954914142 
> -0400 _gcov_reset.o
> <...>
>
> It looks like configure is running WHILE compilation is happening, and 
> _gcov_reset.o just happens to be spawned *late* enough in my case 
> above that the file isnt quite there yet... Although that doesnt make 
> sense either.. although why are some .o's older than the header file..
> OR gthr-default.h is being created a second time when configuring for 
> the non-32 bit (or vice versa).  But that doesnt make sense either 
> since when I look at the other directory I see something similar.
> <...>
> -rw-rw-r--. 1 amacleod amacleod  18008 2015-07-15 08:57:22.678914029 
> -0400 _gcov_execvp.o
> -rw-rw-r--. 1 amacleod amacleod  19192 2015-07-15 08:57:22.706914031 
> -0400 _gcov_execl.o
> -rw-rw-r--. 1 amacleod amacleod  26464 2015-07-15 08:57:22.712914032 
> -0400 _gcov_indirect_call_topn_profiler.o
> -rw-rw-r--. 1 amacleod amacleod   8087 2015-07-15 08:57:22.720914032 
> -0400 _gcov_execve.dep
> -rw-rw-r--. 1 amacleod amacleod   8086 2015-07-15 08:57:22.720914032 
> -0400 _gcov_execv.dep
> lrwxrwxrwx. 1 amacleod amacleod     39 2015-07-15 08:57:22.723914032 
> -0400 gthr-default.h -> /gcc/2015-07-14/gcc/libgcc/gthr-posix.h
> -rw-rw-r--. 1 amacleod amacleod  19296 2015-07-15 08:57:22.729914033 
> -0400 _gcov_execle.o
> -rw-rw-r--. 1 amacleod amacleod  18688 2015-07-15 08:57:22.730914033 
> -0400 _gcov_fork.o
> -rw-rw-r--. 1 amacleod amacleod  18008 2015-07-15 08:57:22.754914035 
> -0400 _gcov_execv.o
> -rw-rw-r--. 1 amacleod amacleod  18184 2015-07-15 08:57:22.760914036 
> -0400 _gcov_execve.o
> <...>
>
> The only other thing I can think of is maybe the configure bits are 
> being run in parallel somehow with the build? , or maybe re-run more 
> than once and my file got unlucky enough to be looking for this one at 
> eactly the wrong moment? To be fair, the config output isnt obvious 
> whether its creating gthr-default in the 64 or 32 bit directory.. 
> making it difficult to figure whats going on, but it does seem 
> interleaved and the timestamps are fishy looking to me.
>
> Im not very good with configure and Makefiles and how we parallelize 
> this... Anyone with any bright ideas?
>
>
> Andrew
>
>
>
> config.status: linking /gcc/2015-07-14/gcc/libgcc/unwind-generic.h to 
> unwind.h
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o _gcov_execve.o -MT _gcov_execve.o -MD -MP 
> -MF _gcov_execve.dep -DL_gcov_execve -c 
> /gcc/2015-07-14/gcc/libgcc/libgcov-interface.c
>
> (1)
>
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o _gcov_reset.o -MT _gcov_reset.o -MD -MP 
> -MF _gcov_reset.dep -DL_gcov_reset -c 
> /gcc/2015-07-14/gcc/libgcc/libgcov-interface.c
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o _gcov.o -MT _gcov.o -MD -MP -MF _gcov.dep 
> -DL_gcov -c /gcc/2015-07-14/gcc/libgcc/libgcov-driver.c
> config.status: linking 
> /gcc/2015-07-14/gcc/libgcc/config/i386/linux-unwind.h to 
> md-unwind-support.h
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o unwind-dw2.o -MT unwind-dw2.o -MD -MP -MF 
> unwind-dw2.dep -fexceptions -c /gcc/2015-07-14/gcc/libgcc/unwind-dw2.c 
> -fvisibility=hidden -DHIDE_EXPORTS
> if [ -z "32" ]; then \
>   true; \
> else \
>   rootpre=`${PWDCMD-pwd}`/; export rootpre; \
>   srcrootpre=`cd /gcc/2015-07-14/gcc/libgcc; ${PWDCMD-pwd}`/; export 
> srcrootpre; \
>   lib=`echo "${rootpre}" | sed -e 's,^.*/\([^/][^/]*\)/$,\1,'`; \
>   compiler="/gcc/2015-07-14/build/./gcc/xgcc 
> -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include   "; \
>   for i in `${compiler} --print-multi-lib 2>/dev/null`; do \
>     dir=`echo $i | sed -e 's/;.*$//'`; \
>     if [ "${dir}" = "." ]; then \
>       true; \
>     else \
>       if [ -d ../${dir}/${lib} ]; then \
>     flags=`echo $i | sed -e 's/^[^;]*;//' -e 's/@/ -/g'`; \
>     if (cd ../${dir}/${lib}; make "AR=ar" "AR_FLAGS=rc" 
> "CC=/gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include   " 
> "CFLAGS=-g -O2" "DESTDIR=" "EXTRA_OFILES=" "HDEFINES=" 
> "INSTALL=/usr/bin/install -c" "INSTALL_DATA=/usr/bin/install -c -m 
> 644" "INSTALL_PROGRAM=/usr/bin/install -c" "LDFLAGS=" "LOADLIBES=" 
> "RANLIB=ranlib" "SHELL=/bin/sh" "prefix=/gcc/2015-07-14/install" 
> "exec_prefix=/gcc/2015-07-14/install" 
> "libdir=/gcc/2015-07-14/install/lib" 
> "libsubdir=/gcc/2015-07-14/install/lib/gcc/x86_64-unknown-linux-gnu/6.0.0" 
> "tooldir=/gcc/2015-07-14/install/x86_64-unknown-linux-gnu" \
>             CFLAGS="-g -O2 ${flags}" \
>             CCASFLAGS=" ${flags}" \
>             FCFLAGS=" ${flags}" \
>             FFLAGS=" ${flags}" \
>             ADAFLAGS=" ${flags}" \
>             prefix="/gcc/2015-07-14/install" \
>             exec_prefix="/gcc/2015-07-14/install" \
>             GCJFLAGS=" ${flags}" \
>             GOCFLAGS="-O2 -g ${flags}" \
>             CXXFLAGS="-g -O2 -D_GNU_SOURCE ${flags}" \
>             LIBCFLAGS="-g -O2 ${flags}" \
>             LIBCXXFLAGS="-g -O2 -D_GNU_SOURCE -fno-implicit-templates 
> ${flags}" \
>             LDFLAGS=" ${flags}" \
>             MULTIFLAGS="${flags}" \
>             DESTDIR="" \
>             INSTALL="/usr/bin/install -c" \
>             INSTALL_DATA="/usr/bin/install -c -m 644" \
>             INSTALL_PROGRAM="/usr/bin/install -c" \
>             INSTALL_SCRIPT="/usr/bin/install -c" \
>             all); then \
>       true; \
>     else \
>       exit 1; \
>     fi; \
>       else true; \
>       fi; \
>     fi; \
>   done; \
> fi
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o unwind-dw2-fde-dip.o -MT 
> unwind-dw2-fde-dip.o -MD -MP -MF unwind-dw2-fde-dip.dep -fexceptions 
> -c /gcc/2015-07-14/gcc/libgcc/unwind-dw2-fde-dip.c -fvisibility=hidden 
> -DHIDE_EXPORTS
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o unwind-sjlj.o -MT unwind-sjlj.o -MD -MP 
> -MF unwind-sjlj.dep -fexceptions -c 
> /gcc/2015-07-14/gcc/libgcc/unwind-sjlj.c -fvisibility=hidden 
> -DHIDE_EXPORTS
> config.status: linking 
> /gcc/2015-07-14/gcc/libgcc/config/i386/sfp-machine.h to sfp-machine.h
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o emutls.o -MT emutls.o -MD -MP -MF 
> emutls.dep -fexceptions -c /gcc/2015-07-14/gcc/libgcc/emutls.c 
> -fvisibility=hidden -DHIDE_EXPORTS
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3_s.o -MT _muldi3_s.o -MD -MP -MF 
> _muldi3_s.dep -DSHARED -DL_muldi3 -c /gcc/2015-07-14/gcc/libgcc/libgcc2.c
>
> (2)
>
> config.status: linking /gcc/2015-07-14/gcc/libgcc/gthr-posix.h to 
> gthr-default.h
> /gcc/2015-07-14/build/./gcc/xgcc -B/gcc/2015-07-14/build/./gcc/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/bin/ 
> -B/gcc/2015-07-14/install/x86_64-unknown-linux-gnu/lib/ -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/include -isystem 
> /gcc/2015-07-14/install/x86_64-unknown-linux-gnu/sys-include    -g -O2 
> -O2  -g -O2 -DIN_GCC -fPIC   -W -Wall -Wno-narrowing -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wold-style-definition  -isystem ./include -fpic -mlong-double-80 
> -DUSE_ELF_SYMVER -g -DIN_LIBGCC2 -fbuilding-libgcc 
> -fno-stack-protector   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -I. -I. 
> -I../.././gcc -I/gcc/2015-07-14/gcc/libgcc 
> -I/gcc/2015-07-14/gcc/libgcc/. -I/gcc/2015-07-14/gcc/libgcc/../gcc 
> -I/gcc/2015-07-14/gcc/libgcc/../include 
> -I/gcc/2015-07-14/gcc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
> -DHAVE_CC_TLS  -DUSE_TLS -o _negdi2_s.o -MT _negdi2_s.o -MD -MP -MF 
> _negdi2_s.dep -DSHARED -DL_negdi2 -c /gcc/2015-07-14/gcc/libgcc/libgcc2.c
>
> (3)
>
> In file included from 
> /gcc/2015-07-14/gcc/libgcc/libgcov-interface.c:27:0:
> /gcc/2015-07-14/gcc/libgcc/gthr.h:148:26: fatal error: gthr-default.h: 
> No such file or directory
> compilation terminated.
> Makefile:883: recipe for target '_gcov_reset.o' failed
> make[3]: *** [_gcov_reset.o] Error 1
> make[3]: *** Waiting for unfinished jobs....
> config.status: executing default commands
>