vcpkg/ports/fftw3/fftw3_arch_fix.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 95bd537a..245acc8f 100644
--- a/CMakeLists.txt	
+++ b/CMakeLists.txt
@@ -66,6 +66,8 @@
 check_prototype_definition (sinl "long double sinl( long double arg )" "0" math.h HAVE_DECL_SINL)
 check_prototype_definition (memalign "void *memalign(size_t alignment, size_t size)" "0" malloc.h HAVE_DECL_MEMALIGN)
 check_prototype_definition (posix_memalign "int posix_memalign(void **memptr, size_t alignment, size_t size)" "0" stdlib.h HAVE_DECL_POSIX_MEMALIGN)
+check_prototype_definition (_aligned_malloc "void* __cdecl _aligned_malloc(size_t _Size, size_t _Alignment)" "0" malloc.h HAVE_DECL_ALIGNED_MALLOC)
+ 
 
 include (CheckSymbolExists)
 check_symbol_exists (clock_gettime time.h HAVE_CLOCK_GETTIME)
@@ -75,6 +77,7 @@
 check_symbol_exists (srand48 stdlib.h HAVE_SRAND48)
 check_symbol_exists (memalign malloc.h HAVE_MEMALIGN)
 check_symbol_exists (posix_memalign stdlib.h HAVE_POSIX_MEMALIGN)
+check_symbol_exists (_aligned_malloc malloc.h HAVE_ALIGNED_MALLOC)
 check_symbol_exists (mach_absolute_time mach/mach_time.h HAVE_MACH_ABSOLUTE_TIME)
 check_symbol_exists (alloca alloca.h HAVE_ALLOCA)
 if (NOT HAVE_ALLOCA)
@@ -131,6 +131,7 @@ endif ()
 
 include (CheckCCompilerFlag)
 
+#All those checks fail due to linkage errors so we directly set HAVE_<ARCH> in the PORTFILE! We assume the user knows what (s)he is doing!
 if (ENABLE_SSE)
   foreach (FLAG "-msse" "/arch:SSE")
     unset (HAVE_SSE CACHE)
@@ -176,8 +177,9 @@ if (ENABLE_AVX2)
 endif ()
 
 # AVX2 codelets require FMA support as well
+# AVX2 implicitly includes FMA using Visual Studio (also definition __FMA__ is not set)
 if (ENABLE_AVX2)
-  foreach (FLAG "-mfma" "/arch:FMA")
+  foreach (FLAG "-mfma" "/arch:AVX2")
     unset (HAVE_FMA CACHE)
     check_c_compiler_flag (${FLAG} HAVE_FMA)
     if (HAVE_FMA)