On 09/08/17 14:05, Andrew Roberts wrote: > I routinely build the weekly snapshots and RC's, on x64, arm and aarch64. > > The last gcc 8 snapshot and the two recent 7.2 RC's have failed to build > on aarch64 (Raspberry Pi 3, running Arch Linux ARM). I have finally > traced this to the system running out of memory. I guess a recent kernel > update had changed the memory page size and the swap file was no longer > being used because the page sizes didn't match. > > Obviously this is my issue, but the error's I was getting from gcc did > not help. I was getting ICE's, thus: > > /usr/local/gcc/bin/g++ -Wall -Wextra -Wno-ignored-qualifiers > -Wno-sign-compare -Wno-write-strings -std=c++14 -pipe -march=armv8-a > -mcpu=cortex-a53 -mtune=cortex-a53 -ftree-vectorize -O3 > -DUNAME_S=\"linux\" -DUNAME_M=\"aarch64\" -DOSMESA=1 -I../libs/include > -DRASPBERRY_PI -I/usr/include/freetype2 -I/usr/include/harfbuzz > -I/usr/include/unicode -c -o glerr.o glerr.cpp > {standard input}: Assembler messages: > {standard input}: Warning: end of file not at end of a line; newline > inserted > {standard input}:204: Error: operand 1 must be an integer register -- `mov' > {standard input}: Error: open CFI at the end of file; missing > .cfi_endproc directive > g++: internal compiler error: Killed (program cc1plus) > Please submit a full bug report, > with preprocessed source if appropriate. > See <https://gcc.gnu.org/bugs/> for instructions. > make: *** [<builtin>: glerr.o] Error 4 > make: *** Waiting for unfinished jobs.... > > I was seeing the problem when building using make -j2. Both building gcc > and building large user projects. > > There are two issues here: > > 1) There was discussion about increasing the amount of memory gcc would > reserve to help speed up compilation of large source files, I wondered > if this could be a factor. > > 2) It would be nice to see some sort of out of memory error, rather than > just an ICE. > > The system has 858Mb of RAM without the swap file. > > Building a single source file seems to use up to 97% of the available > memory (for a 2522 line C++ source file). > > make -j2 is enough to cause the failure. > > Regards > > Andrew Roberts > > > > > >
If you think gcc is using an unreasonable amount of memory for a particular bit of code then please file a bug report, with pre-processed source code (don't assume that because the sources are part of gcc we can reproduce your setup). You should also set the keyword "memory-hog" on the report. If you have statistics for older versions of the compiler, or for other targets that will add evidence for us to look at. R.