I can't seem to reproduce the link error you've mentioned (I'm building
hello_world on master).
can you share more information on how to reproduce it? (MinGW version, build
env variables, build OS).
Thanks,
Tal.
Hi Tal,
Sure - latest MinGW-w64 (v8.0.0 I believe, but the versioning isn't too
clear to me!). gcc -v reports:
C:\Users\Nick>c:\MinGW\mingw64\bin\gcc -v
Using built-in specs.
COLLECT_GCC=c:\MinGW\mingw64\bin\gcc
COLLECT_LTO_WRAPPER=c:/MinGW/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/8.1.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../../../src/gcc-8.1.0/configure
--host=x86_64-w64-mingw32 --build=x86_64-w64-mingw32
--target=x86_64-w64-mingw32 --prefix=/mingw64
--with-sysroot=/c/mingw810/x86_64-810-win32-seh-rt_v6-rev0/mingw64
--enable-shared --enable-static --disable-multilib
--enable-languages=c,c++,fortran,lto --enable-libstdcxx-time=yes
--enable-threads=win32 --enable-libgomp --enable-libatomic
--enable-lto --enable-graphite --enable-checking=release
--enable-fully-dynamic-string --enable-version-specific-runtime-libs
--disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap
--disable-rpath --disable-win32-registry --disable-nls
--disable-werror --disable-symvers --with-gnu-as --with-gnu-ld
--with-arch=nocona --with-tune=core2 --with-libiconv
--with-system-zlib
--with-gmp=/c/mingw810/prerequisites/x86_64-w64-mingw32-static
--with-mpfr=/c/mingw810/prerequisites/x86_64-w64-mingw32-static
--with-mpc=/c/mingw810/prerequisites/x86_64-w64-mingw32-static
--with-isl=/c/mingw810/prerequisites/x86_64-w64-mingw32-static
--with-pkgversion='x86_64-win32-seh-rev0, Built by MinGW-W64 project'
--with-bugurl=https://sourceforge.net/projects/mingw-w64 CFLAGS='-O2
-pipe -fno-ident
-I/c/mingw810/x86_64-810-win32-seh-rt_v6-rev0/mingw64/opt/include
-I/c/mingw810/prerequisites/x86_64-zlib-static/include
-I/c/mingw810/prerequisites/x86_64-w64-mingw32-static/include'
CXXFLAGS='-O2 -pipe -fno-ident
-I/c/mingw810/x86_64-810-win32-seh-rt_v6-rev0/mingw64/opt/include
-I/c/mingw810/prerequisites/x86_64-zlib-static/include
-I/c/mingw810/prerequisites/x86_64-w64-mingw32-static/include'
CPPFLAGS='
-I/c/mingw810/x86_64-810-win32-seh-rt_v6-rev0/mingw64/opt/include
-I/c/mingw810/prerequisites/x86_64-zlib-static/include
-I/c/mingw810/prerequisites/x86_64-w64-mingw32-static/include'
LDFLAGS='-pipe -fno-ident
-L/c/mingw810/x86_64-810-win32-seh-rt_v6-rev0/mingw64/opt/lib
-L/c/mingw810/prerequisites/x86_64-zlib-static/lib
-L/c/mingw810/prerequisites/x86_64-w64-mingw32-static/lib '
Thread model: win32
gcc version 8.1.0 (x86_64-win32-seh-rev0, Built by MinGW-W64 project)
No special build args, just Meson (0.55.3) with --buildtype==debug
-Dexamples=helloworld
DPDK builds just fine with both MinGW and Clang, but when I try and use
it to build the SPDK the linking fails with MinGW (but works fine with
Clang). The error message is:
CC app/trace_record/trace_record.o
LINK spdk_trace_record.exe
C:/Users/Nick/Repos/upstream/build/lib/librte_bus_pci.a(bus_pci_windows_pci.c.obj):pci.c:(.rdata$.refptr.GUID_DEVCLASS_NET[.refptr.GUID_DEVCLASS_NET]+0x0):
undefined reference to `GUID_DEVCLASS_NET'
As far as I can see this is because the GUID_DEVCLASS_NET structure has
not been created within the DPDK object files - it requires INITGUID to
be set when devguid.h is included in order to create a 'select any'
initialised structure. Moving devguid.h after defining INITGUID
resolves the issue. Arguably, it would perhaps be better to define
INITGUID in the source files that use the guids instead of in a shared
header, but I think this can safely be left until after 20.11 is
finalized - if there's any impact on the code produced it will be
negligible.
I haven't worked it through but I suspect the reason it's ok with clang
is because of a difference between the Microsoft headers and those
shipped with MinGW.
Regards,
Nick
