Okay, that solved that error, now I get:
.... -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2
-fdiagnostics-show-location=once -ffunction-sections -fdata-sections
-frandom-seed=fs_ops.lo -fimplicit-templates -g -O2 -c
../../../../../../libstdc++-v3/src/c++17/fs_ops.cc -o fs_ops.o
In file included from ../../../../../../libstdc++-v3/src/c++17/fs_ops.cc:58:
../../../../../../libstdc++-v3/src/c++17/../filesystem/ops-common.h: In
function 'const char*
std::filesystem::get_temp_directory_from_env(std::error_code&)':
../../../../../../libstdc++-v3/src/c++17/../filesystem/ops-common.h:601:25:
error: '::secure_getenv' has not been declared
601 | auto tmpdir = ::secure_getenv(env);
| ^~~~~~~~~~~~~
and there is a weird subdirectory under the build directory: gccd: - the
colon cannot be part of a directory name under Windows. I guess this is my
mistake, as I set the install directory to "d:/gfortran/work" - that should
become "/cygdrive/d/gfortran/work". Easily fixed, but I do not know what to
do about the first error.
Regards,
Arjen
Op vr 20 aug. 2021 om 12:10 schreef Arjen Markus <arjen.markus...@gmail.com
>:
>
>
> Op vr 20 aug. 2021 om 11:54 schreef Richard Biener:
>
>>
>>
>> The easiest is probably to build them in-tree by means of
>> executing ./contrib/download_prerequesites which will download
>> and unpack them into your source tree.
>>
>>
> Well, I do have the libraries (source and all) and I copied the built
> libraries (that is the content of mpfr/,libs and mpc/.libs to the locations
> that are referred to in the link statement, so I assumed that would enable
> the linker to find them.
>
> Other than that you are likely either missing some of the requirements
>> or lack the appropriate --with-{gmp,mpc,mpfr}[-lib] configury.
>>
>>
> The odd thing is that the link statement as presented in the command
> window knows where to find the libraries. Here is the (hopefully) relevant
> part:
>
> g++ -std=c++11 -no-pie -g -DIN_GCC -fno-exceptions -fno-rtti
> -fasynchronous-unwind-tables -W -Wall
> (...) ../libcpp/libcpp.a ../libdecnumber/libdecnumber.a
> -L/cygdrive/d/gfortran/gcc/build-gcc/./gmp/.libs
> -L/cygdrive/d/gfortran/gcc/build-gcc/./mpfr/src/.libs
> -L/cygdrive/d/gfortran/gcc/build-gcc/./mpc/src/.libs -lmpc -lmpfr -lgmp
> -L./../zlib -lz libcommon.a ../libcpp/libcpp.a -liconv
> ../libbacktrace/.libs/libbacktrace.a ../libiberty/libiberty.a
> ../libdecnumber/libdecnumber.a
> /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld:
> cannot find -lmpc
> /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld:
> cannot find -lmpc
> /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld:
> cannot find -lmpfr
> /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld:
> cannot find -lmpfr
> /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld:
> cannot find -lmpc
> /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld:
> cannot find -lmpfr
>
>
> What host operating system are you using?
>>
>> Cygwin on Windows 10
>
> Oops, now that I copied the relevant bit of the link command, I see what I
> did wrong: the libraries are under mpfr/./libs, not mpfr/src/.libs (and
> ditto for mpc).
>
> Okay, trying again!
>
> Thanks for the reply. This ought to do it.
>
> Regards,
>
> Arjen
>
