use MPIR on Windows

CMakeLists.txt

@@ -59,7 +59,7 @@ option(ENABLE_MODULE_RECOVERY "Enable ECDSA pubkey recovery module." ON)
 set(WITH_ASM "auto" CACHE STRING "Specify assembly optimizations to use (x86_64|arm|no|auto).")
 set(WITH_FIELD "auto" CACHE STRING "Specify Field Implementation (64bit|32bit|auto).")
 set(WITH_SCALAR "auto" CACHE STRING "Specify scalar implementation (64bit|32bit|auto).")
-set(WITH_BIGNUM "auto" CACHE STRING "Specify Bignum Implementation (gmp|no|auto).")
+set(WITH_BIGNUM "auto" CACHE STRING "Specify Bignum Implementation (gmp|mpir|no|auto).")
 
 message(${WITH_BIGNUM})
 
@@ -224,6 +224,16 @@ if (${WITH_BIGNUM} STREQUAL "gmp")
     target_include_directories(secp256k1 PUBLIC ${GMP_INCLUDE_DIR})
     target_link_libraries(secp256k1 ${GMP_LIBRARIES})
   endif()
+elseif (${WITH_BIGNUM} STREQUAL "mpir")
+  target_compile_definitions(secp256k1 PUBLIC -DHAVE_LIBGMP=1)
+  target_compile_definitions(secp256k1 PUBLIC -DUSE_NUM_GMP=1)
+  target_compile_definitions(secp256k1 PUBLIC -DUSE_FIELD_INV_NUM=1)
+  target_compile_definitions(secp256k1 PUBLIC -DUSE_SCALAR_INV_NUM=1)
+
+  # if (NO_CONAN_AT_ALL)
+  #   target_include_directories(secp256k1 PUBLIC ${GMP_INCLUDE_DIR})
+  #   target_link_libraries(secp256k1 ${GMP_LIBRARIES})
+  # endif()
 elseif (${WITH_BIGNUM} STREQUAL "no")
   target_compile_definitions(secp256k1 PUBLIC -DUSE_NUM_NONE=1)
   target_compile_definitions(secp256k1 PUBLIC -DUSE_FIELD_INV_BUILTIN=1)

conanfile.py

@@ -78,8 +78,16 @@ class Secp256k1Conan(ConanFile):
     exports_sources = "src/*", "include/*", "CMakeLists.txt", "cmake/*", "secp256k1Config.cmake.in", "contrib/*", "test/*"
 
     def requirements(self):
-        if self.settings.os == "Linux" or self.settings.os == "Macos":
+        # if self.settings.os == "Linux" or self.settings.os == "Macos":
+        #     self.requires("gmp/6.1.2@bitprim/stable")
+
+
+        if self.settings.os == "Windows":
+            self.requires("mpir/3.0.0@bitprim/stable")
+        else:
             self.requires("gmp/6.1.2@bitprim/stable")
+
+        #TODO(fernando): What happend with FreeBSD?
 
     def build(self):
         cmake = CMake(self)
@@ -100,7 +108,9 @@ def build(self):
         cmake.definitions["ENABLE_MODULE_RECOVERY"] = option_on_off(self.options.enable_module_recovery)
 
         if self.settings.os == "Windows":
-            cmake.definitions["WITH_BIGNUM"] = "no"
+            # cmake.definitions["WITH_BIGNUM"] = "no"
+            cmake.definitions["WITH_BIGNUM"] = "mpir"
+
             if self.settings.compiler == "Visual Studio" and (self.settings.compiler.version != 12):
                 cmake.definitions["ENABLE_TESTS"] = "OFF"   #Workaround. test broke MSVC
         else: