Build error on macOS

1. Qt, origin/5.7, commit 36e7cff94fbb4af5d8de6739e66164c6e6873586
2. Configure

   sh configure -opensource -confirm-license -prefix /Users/dmitry/Documents/Sources/Qt5/lib/5.7.1-macosx-x86_64-clang -platform macx-clang -pch -ltcg -no-warnings-are-errors -nomake examples -nomake tests
   

      Configure summary
   
   Build type:    macx-clang (x86_64, CPU features: cx16 mmx sse sse2 sse3 ssse3)
   
   Build options:
     Configuration .......... accessibility audio-backend avx avx2 avx512cd avx512er avx512f build_all c++11 c++14 c++1z compile_examples concurrent corewlan cups dbus debug debug_and_release doubleconversion freetype full-config getaddrinfo getifaddrs harfbuzz iconv ipv6ifname large-config largefile ltcg medium-config minimal-config no-libdl no-pkg-config opengl pcre png poll_poll precompile_header qpa qpa qt_framework reduce_exports release rpath securetransport shared small-config sse2 sse3 sse4_1 sse4_2 ssl ssse3 system-zlib 
     Build parts ............ libs tools
     Mode ................... debug and release; default link: debug
     Using sanitizer(s)...... none
     Using C++ standard ..... c++1z
     Using gold linker....... no
     Using new DTAGS ........ no
     Using PCH .............. yes
     Using LTCG ............. yes
     Target compiler supports:
       SSE .................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
       AVX .................. AVX AVX2
       AVX512 ............... AVX512F AVX512ER AVX512CD
   
   Qt modules and options:
     Qt D-Bus ............... yes (loading dbus-1 at runtime)
     Qt Concurrent .......... yes
     Qt GUI ................. yes
     Qt Widgets ............. yes
     Large File ............. yes
     QML debugging .......... yes
     Use system proxies ..... no
   
   Support enabled for:
     Accessibility .......... yes
     ALSA ................... no
     CUPS ................... yes
     DoubleConversion........ yes (bundled copy)
     Evdev .................. no
     FontConfig ............. no
     FreeType ............... yes (bundled copy)
     Glib ................... no
     GStreamer .............. no
     GTK platformtheme ...... no
     HarfBuzz ............... yes (bundled copy)
     Iconv .................. yes
     ICU .................... no
     Image formats: 
       GIF .................. yes (plugin, using bundled copy)
       JPEG ................. yes (plugin, using bundled copy)
       PNG .................. yes (in QtGui, using bundled copy)
     libinput................ no
     Logging backends: 
       journald ............... no
       syslog   ............... no
     mtdev .................. no
     Networking: 
       CoreWlan ............. yes
       getaddrinfo .......... yes
       getifaddrs ........... yes
       IPv6 ifname .......... yes
       libproxy.............. no
       OpenSSL .............. no
       SecureTransport ...... yes
     OpenGL / OpenVG: 
       EGL .................. no
       OpenGL ............... desktop
       OpenVG ............... no
     PCRE ................... yes (bundled copy)
     pkg-config ............. no 
     PulseAudio ............. no
     QPA backends: 
       DirectFB ............. no
       EGLFS ................ no
         EGLFS i.MX6 ........ no
         EGLFS i.MX6 Wayland. no
         EGLFS EGLDevice .... no
         EGLFS GBM .......... no
         EGLFS Mali ......... no
         EGLFS Raspberry Pi . no
         EGLFS X11 .......... no
       LinuxFB .............. no
       Mir client............ no
       XCB .................. no
     Session management ..... yes
     SQL drivers: 
       DB2 .................. no
       InterBase ............ no
       MySQL ................ no
       OCI .................. no
       ODBC ................. no
       PostgreSQL ........... no
       SQLite 2 ............. no
       SQLite ............... yes (plugin, using bundled copy)
       TDS .................. no
     tslib .................. no
     udev ................... no
     xkbcommon-x11........... no
     xkbcommon-evdev......... no
     zlib ................... yes (system library)
   

3. Build

   make -j 1
   ...
    |cd 3rdparty/pcre/ && ( test -e Makefile || /Users/dmitry/Documents/Sources/Qt5/build/macosx/qtbase/bin/qmake /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre.pro -qtconf /Users/dmitry/Documents/Sources/Qt5/build/macosx/qtbase/bin/qt.conf -o Makefile ) && /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile 
    |/Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile.Debug all
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -g -fPIC -fvisibility=hidden -w -fno-exceptions -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/debug/pcre16_byte_order.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_byte_order.c
   ...
    |rm -f ../../../lib/libqtpcre_debug.a
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar cq ../../../lib/libqtpcre_debug.a .obj/debug/pcre16_byte_order.o .obj/debug/pcre16_chartables.o .obj/debug/pcre16_compile.o .obj/debug/pcre16_config.o .obj/debug/pcre16_dfa_exec.o .obj/debug/pcre16_exec.o .obj/debug/pcre16_fullinfo.o .obj/debug/pcre16_get.o .obj/debug/pcre16_globals.o .obj/debug/pcre16_jit_compile.o .obj/debug/pcre16_maketables.o .obj/debug/pcre16_newline.o .obj/debug/pcre16_ord2utf16.o .obj/debug/pcre16_refcount.o .obj/debug/pcre16_string_utils.o .obj/debug/pcre16_study.o .obj/debug/pcre16_tables.o .obj/debug/pcre16_ucd.o .obj/debug/pcre16_utf16_utils.o .obj/debug/pcre16_valid_utf16.o .obj/debug/pcre16_version.o .obj/debug/pcre16_xclass.o
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib -s ../../../lib/libqtpcre_debug.a
    |/Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile.Release all
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_byte_order.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_byte_order.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_chartables.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_chartables.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_compile.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_compile.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_config.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_config.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_dfa_exec.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_dfa_exec.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_exec.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_exec.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_fullinfo.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_fullinfo.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_get.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_get.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_globals.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_globals.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_jit_compile.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_jit_compile.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_maketables.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_maketables.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_newline.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_newline.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_ord2utf16.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_ord2utf16.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_refcount.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_refcount.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_string_utils.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_string_utils.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_study.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_study.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_tables.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_tables.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_ucd.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_ucd.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_utf16_utils.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_utf16_utils.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_valid_utf16.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_valid_utf16.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_version.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_version.c
    |/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.8 -O2 -fPIC -fvisibility=hidden -w -fno-exceptions -flto -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DHAVE_CONFIG_H -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre -I. -I/Users/dmitry/Documents/Sources/Qt5/src/qtbase/mkspecs/macx-clang -o .obj/release/pcre16_xclass.o /Users/dmitry/Documents/Sources/Qt5/src/qtbase/src/3rdparty/pcre/pcre16_xclass.c
    |rm -f ../../../lib/libqtpcre.a
    |llvm-ar cqs ../../../lib/libqtpcre.a .obj/release/pcre16_byte_order.o .obj/release/pcre16_chartables.o .obj/release/pcre16_compile.o .obj/release/pcre16_config.o .obj/release/pcre16_dfa_exec.o .obj/release/pcre16_exec.o .obj/release/pcre16_fullinfo.o .obj/release/pcre16_get.o .obj/release/pcre16_globals.o .obj/release/pcre16_jit_compile.o .obj/release/pcre16_maketables.o .obj/release/pcre16_newline.o .obj/release/pcre16_ord2utf16.o .obj/release/pcre16_refcount.o .obj/release/pcre16_string_utils.o .obj/release/pcre16_study.o .obj/release/pcre16_tables.o .obj/release/pcre16_ucd.o .obj/release/pcre16_utf16_utils.o .obj/release/pcre16_valid_utf16.o .obj/release/pcre16_version.o .obj/release/pcre16_xclass.o
    |make[4]: llvm-ar: No such file or directory
    |make[4]: *** [../../../lib/libqtpcre.a] Error 1
   

As you can see, $(AR) has different values in Debug and Release conf.