Cross compiling for Windows. Where is .dll file?

[robert-dzikowski]

I tried to cross compile for Windows with
$ cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/x86_64-w64-mingw32.toolchain.cmake

 cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/x86_64-w64-mingw32.toolchain.cmake
-- Performing Test Valgrind_WORKS
-- Performing Test Valgrind_WORKS - Failed
-- Could NOT find Valgrind (missing: Valgrind_WORKS)


secp256k1 configure summary
===========================
Build artifacts:
  library type ........................ Shared
Optional modules:
  ECDH ................................ ON
  ECDSA pubkey recovery ............... OFF
  extrakeys ........................... ON
  schnorrsig .......................... ON
  ElligatorSwift ...................... ON
Parameters:
  ecmult window size .................. 15
  ecmult gen precision bits ........... 4
Optional features:
  assembly ............................ x86_64
  external callbacks .................. OFF
Optional binaries:
  benchmark ........................... ON
  noverify_tests ...................... ON
  tests ............................... ON
  exhaustive tests .................... ON
  ctime_tests ......................... OFF
  examples ............................ OFF

Cross compiling ....................... TRUE, for Windows, x86_64
Valgrind .............................. OFF
Preprocessor defined macros ........... ENABLE_MODULE_ELLSWIFT=1 ENABLE_MODULE_SCHNORRSIG=1 ENABLE_MODULE_EXTRAKEYS=1 ENABLE_MODULE_ECDH=1 ECMULT_WINDOW_SIZE=15 ECMULT_GEN_PREC_BITS=4 USE_ASM_X86_64=1
C compiler ............................ /usr/bin/x86_64-w64-mingw32-gcc
CFLAGS ................................
Compile options ....................... -pedantic -Wall -Wcast-align -Wcast-align=strict -Wextra -Wnested-externs -Wno-long-long -Wno-overlength-strings -Wno-unused-function -Wshadow -Wstrict-prototypes -Wundef
Build type:
 - CMAKE_BUILD_TYPE ................... RelWithDebInfo
 - CFLAGS .............................
 - LDFLAGS for executables ............
 - LDFLAGS for shared libraries .......


-- Configuring done
-- Generating done
-- Build files have been written to: /home/robert/secp256k1/cmake

But there are no .dll files in /home/robert/secp256k1/cmake.
I am using Windows Subsystem Linux with Ubuntu 22.04.2 LTS.

[real-or-random]

The command cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/x86_64-w64-mingw32.toolchain.cmake only prepares the build. You need to run cmake --build . afterwards to run the build process. See the instructions in the README file.