I have build gcc 8.2.0 as as crosscompiler for Centos 7 x86_64 -> MinGW x86_64. Before starting I installed gcc 4.9.3 MinGW crosscompiler from EPEL repository. My new crosscompiler was configured in following way: [root@localhost build]# ../gcc-8.2.0/configure --prefix=/gcc-8.2-mingw/ --enable-languages=c,c++ --disable-multilib --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --target=x86_64-w64-mingw32 --without-newlib --disable-multilib --disable-plugin --with-system-zlib --disable-nls --without-included-gettext --disable-win32-registry --enable-threads=posix --enable-libgomp --with-sysroot=/usr/x86_64-w64-mingw32/sys-root --with-gxx-include-dir=/usr/x86_64-w64-mingw32/sys-root/mingw/include/c++ checking build system type... x86_64-redhat-linux-gnu checking host system type... x86_64-redhat-linux-gnu checking target system type... x86_64-w64-mingw32 checking for a BSD-compatible install... /bin/install -c checking whether ln works... yes checking whether ln -s works... yes checking for a sed that does not truncate output... /bin/sed checking for gawk... gawk checking for libatomic support... yes checking for libitm support... no checking for libsanitizer support... no checking for libvtv support... yes checking for libmpx support... no checking for libhsail-rt support... no checking for x86_64-redhat-linux-gnu-gcc... no checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for x86_64-redhat-linux-gnu-g++... no checking for x86_64-redhat-linux-gnu-c++... no checking for x86_64-redhat-linux-gnu-gpp... no checking for x86_64-redhat-linux-gnu-aCC... no checking for x86_64-redhat-linux-gnu-CC... no checking for x86_64-redhat-linux-gnu-cxx... no checking for x86_64-redhat-linux-gnu-cc++... no checking for x86_64-redhat-linux-gnu-cl.exe... no checking for x86_64-redhat-linux-gnu-FCC... no checking for x86_64-redhat-linux-gnu-KCC... no checking for x86_64-redhat-linux-gnu-RCC... no checking for x86_64-redhat-linux-gnu-xlC_r... no checking for x86_64-redhat-linux-gnu-xlC... no checking for g++... g++ checking whether we are using the GNU C++ compiler... yes checking whether g++ accepts -g... yes checking whether g++ accepts -static-libstdc++ -static-libgcc... no checking for x86_64-redhat-linux-gnu-gnatbind... no checking for gnatbind... no checking for x86_64-redhat-linux-gnu-gnatmake... no checking for gnatmake... no checking whether compiler driver understands Ada... no checking how to compare bootstrapped objects... cmp --ignore-initial=16 $$f1 $$f2 checking for objdir... .libs configure: WARNING: using in-tree isl, disabling version check *** This configuration is not supported in the following subdirectories: zlib target-libitm target-libsanitizer target-libmpx target-libffi target-libgo gnattools gotools target-libada target-libhsail-rt target-libgfortran target-libbacktrace target-libobjc target-liboffloadmic (Any other directories should still work fine.) checking for default BUILD_CONFIG... checking for --enable-vtable-verify... no checking for bison... bison -y checking for bison... bison checking for gm4... no checking for gnum4... no checking for m4... m4 checking for flex... flex checking for flex... flex checking for makeinfo... makeinfo checking for expect... no checking for runtest... no checking for x86_64-redhat-linux-gnu-ar... no checking for ar... ar checking for x86_64-redhat-linux-gnu-as... no checking for as... as checking for x86_64-redhat-linux-gnu-dlltool... no checking for dlltool... no checking for x86_64-redhat-linux-gnu-ld... no checking for ld... ld checking for x86_64-redhat-linux-gnu-lipo... no checking for lipo... no checking for x86_64-redhat-linux-gnu-nm... no checking for nm... nm checking for x86_64-redhat-linux-gnu-ranlib... no checking for ranlib... ranlib checking for x86_64-redhat-linux-gnu-strip... no checking for strip... strip checking for x86_64-redhat-linux-gnu-windres... no checking for windres... no checking for x86_64-redhat-linux-gnu-windmc... no checking for windmc... no checking for x86_64-redhat-linux-gnu-objcopy... no checking for objcopy... objcopy checking for x86_64-redhat-linux-gnu-objdump... no checking for objdump... objdump checking for x86_64-redhat-linux-gnu-readelf... no checking for readelf... readelf checking for x86_64-w64-mingw32-cc... no checking for x86_64-w64-mingw32-gcc... x86_64-w64-mingw32-gcc checking for x86_64-w64-mingw32-c++... x86_64-w64-mingw32-c++ checking for x86_64-w64-mingw32-gcc... x86_64-w64-mingw32-gcc checking for x86_64-w64-mingw32-gfortran... no checking for x86_64-w64-mingw32-gccgo... no checking for ar... no checking for x86_64-w64-mingw32-ar... x86_64-w64-mingw32-ar checking for as... no checking for x86_64-w64-mingw32-as... x86_64-w64-mingw32-as checking for dlltool... no checking for x86_64-w64-mingw32-dlltool... x86_64-w64-mingw32-dlltool checking for ld... no checking for x86_64-w64-mingw32-ld... x86_64-w64-mingw32-ld checking for lipo... no checking for x86_64-w64-mingw32-lipo... no checking for nm... no checking for x86_64-w64-mingw32-nm... x86_64-w64-mingw32-nm checking for objcopy... no checking for x86_64-w64-mingw32-objcopy... x86_64-w64-mingw32-objcopy checking for objdump... no checking for x86_64-w64-mingw32-objdump... x86_64-w64-mingw32-objdump checking for ranlib... no checking for x86_64-w64-mingw32-ranlib... x86_64-w64-mingw32-ranlib checking for readelf... no checking for x86_64-w64-mingw32-readelf... x86_64-w64-mingw32-readelf checking for strip... no checking for x86_64-w64-mingw32-strip... x86_64-w64-mingw32-strip checking for windres... no checking for x86_64-w64-mingw32-windres... x86_64-w64-mingw32-windres checking for windmc... no checking for x86_64-w64-mingw32-windmc... x86_64-w64-mingw32-windmc checking where to find the target ar... pre-installed checking where to find the target as... pre-installed checking where to find the target cc... just compiled checking where to find the target c++... just compiled checking where to find the target c++ for libstdc++... just compiled checking where to find the target dlltool... pre-installed checking where to find the target gcc... just compiled checking where to find the target gfortran... pre-installed checking where to find the target gccgo... pre-installed checking where to find the target ld... pre-installed checking where to find the target lipo... pre-installed checking where to find the target nm... pre-installed checking where to find the target objcopy... pre-installed checking where to find the target objdump... pre-installed checking where to find the target ranlib... pre-installed checking where to find the target readelf... pre-installed checking where to find the target strip... pre-installed checking where to find the target windres... pre-installed checking where to find the target windmc... pre-installed checking whether to enable maintainer-specific portions of Makefiles... no configure: creating ./config.status config.status: creating Makefile [root@localhost build]# Build also completed successfully. However when I tried to use it, it turned out that it is broken. Looks that configure script found preinstalled binutils, but path to it is not hardcoded in built crosscompiler. Here is output from build with --verbose option: [root@localhost 1]# /gcc-8.2-mingw/bin/x86_64-w64-mingw32-gcc b.c --verbose Using built-in specs. COLLECT_GCC=/gcc-8.2-mingw/bin/x86_64-w64-mingw32-gcc COLLECT_LTO_WRAPPER=/gcc-8.2-mingw/libexec/gcc/x86_64-w64-mingw32/8.2.0/lto-wrapper Target: x86_64-w64-mingw32 Configured with: ../gcc-8.2.0/configure --prefix=/gcc-8.2-mingw/ --enable-languages=c,c++ --disable-multilib --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --target=x86_64-w64-mingw32 --without-newlib --disable-multilib --disable-plugin --with-system-zlib --disable-nls --without-included-gettext --disable-win32-registry --enable-threads=posix --enable-libgomp --with-sysroot=/usr/x86_64-w64-mingw32/sys-root --with-gxx-include-dir=/usr/x86_64-w64-mingw32/sys-root/mingw/include/c++ Thread model: posix gcc version 8.2.0 (GCC) COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64' /gcc-8.2-mingw/libexec/gcc/x86_64-w64-mingw32/8.2.0/cc1 -quiet -v -D_REENTRANT b.c -quiet -dumpbase b.c -mtune=generic -march=x86-64 -auxbase b -version -o /tmp/ccqSPwgR.s GNU C17 (GCC) version 8.2.0 (x86_64-w64-mingw32) compiled by GNU C version 4.8.5 20150623 (Red Hat 4.8.5-28), GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3, isl version isl-0.18-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 ignoring nonexistent directory "/usr/x86_64-w64-mingw32/sys-root/usr/local/include" ignoring nonexistent directory "/gcc-8.2-mingw/lib/gcc/x86_64-w64-mingw32/8.2.0/../../../../x86_64-w64-mingw32/include" #include "..." search starts here: #include <...> search starts here: /gcc-8.2-mingw/lib/gcc/x86_64-w64-mingw32/8.2.0/include /gcc-8.2-mingw/lib/gcc/x86_64-w64-mingw32/8.2.0/include-fixed /usr/x86_64-w64-mingw32/sys-root/mingw/include End of search list. GNU C17 (GCC) version 8.2.0 (x86_64-w64-mingw32) compiled by GNU C version 4.8.5 20150623 (Red Hat 4.8.5-28), GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3, isl version isl-0.18-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 469d3d21441592861ac6e22f11562b56 COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64' as -v -o /tmp/ccKqLs8c.o /tmp/ccqSPwgR.s GNU assembler version 2.27 (x86_64-redhat-linux) using BFD version version 2.27-28.base.el7_5.1 /tmp/ccqSPwgR.s: Assembler messages: /tmp/ccqSPwgR.s:3: Error: unknown pseudo-op: `.def' /tmp/ccqSPwgR.s:3: Error: unknown pseudo-op: `.scl' /tmp/ccqSPwgR.s:3: Error: Missing symbol name in directive /tmp/ccqSPwgR.s:3: Error: unrecognized symbol type "32" /tmp/ccqSPwgR.s:3: Error: unknown pseudo-op: `.endef' /tmp/ccqSPwgR.s:5: Error: unknown pseudo-op: `.def' /tmp/ccqSPwgR.s:5: Error: unknown pseudo-op: `.scl' /tmp/ccqSPwgR.s:5: Error: Missing symbol name in directive /tmp/ccqSPwgR.s:5: Error: unrecognized symbol type "32" /tmp/ccqSPwgR.s:5: Error: unknown pseudo-op: `.endef' /tmp/ccqSPwgR.s:6: Error: unknown pseudo-op: `.seh_proc' /tmp/ccqSPwgR.s:9: Error: unknown pseudo-op: `.seh_pushreg' /tmp/ccqSPwgR.s:11: Error: unknown pseudo-op: `.seh_setframe' /tmp/ccqSPwgR.s:13: Error: unknown pseudo-op: `.seh_stackalloc' /tmp/ccqSPwgR.s:14: Error: unknown pseudo-op: `.seh_endprologue' /tmp/ccqSPwgR.s:20: Error: unknown pseudo-op: `.seh_endproc'
Update: there is workaround for this, pass "--with-ld=/bin/x86_64-w64-mingw32-ld --with-as=/bin/x86_64-w64-mingw32-as" to configure script. I also tried to use "--with-ld=x86_64-w64-mingw32-ld --with-as=x86_64-w64-mingw32-as". With these options initial configure completed successfully, but build failed that command cannot be found - probably PATH environment variable was cleared during build, and full path to specified as/ld was not saved.
Possibly related to or a duplicate of bug 61651?
The place where gcc usually finds the cross assembler/linker is aarch64-linux-gnu/bin/ rather than via the cross name unless you supply --with-as . Though I wonder if this should change ...