[Bug 1318635] Re: qtbase failed to build on arm64 on utopic

[Timo Jyrinki]

Regarding pcre, it seems it's just an oversight and not something that
has been tried. Debian will try to enable it at some point, and we can
either follow at that point or if wanted take a lead.

Dmitry: Matthias mentioned that when PCH is enabled it's hard to debug
compiler crashes, so I guess what he's after would be a test case with
PCH disabled.

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https://bugs.launchpad.net/bugs/1318635

Title:
  qtbase failed to build on arm64 on utopic

Status in “gcc-defaults” package in Ubuntu:
  Confirmed
Status in “qtbase-opensource-src” package in Ubuntu:
  Fix Released

Bug description:
  The latest qtbase upload:
  https://launchpad.net/ubuntu/utopic/+source/qtbase-opensource-src/5.2.1+dfsg-1ubuntu16

  failed to build on arm64:
  ---
  gcc -c -include .pch/Qt5Core -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -O2 -fvisibility=hidden -Wall -W -D_REENTRANT -fPIC -DQT_NO_MTDEV -DQT_NO_USING_NAMESPACE -DQT_BUILD_CORE_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DELF_INTERPRETER=\"/lib/ld-linux-aarch64.so.1\" -DQT_USE_ICU -DPCRE_HAVE_CONFIG_H -DQT_CORE_LIB -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -I../../mkspecs/linux-g++ -I. -I../../include -I../../include/QtCore -I../../include/QtCore/5.2.1 -I../../include/QtCore/5.2.1/QtCore -Iglobal -I../3rdparty/pcre -I../3rdparty/harfbuzz/src -I../3rdparty/md5 -I../3rdparty/md4 -I../3rdparty/sha3 -I.moc -o .obj/pcre16_jit_compile.o ../3rdparty/pcre/pcre16_jit_compile.c
  gcc: internal compiler error: Segmentation fault (program cc1)
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-4.8/README.Bugs> for instructions.
  Makefile:19974: recipe for target '.obj/pcre16_fullinfo.o' failed
  ---

  The previous build on utopic was fine, and a trusty build with the
  same patch as ubuntu16 built ok.

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