build,fwd: Fix building issues on MSYS2

mcfgthread/fwd.h

@@ -374,7 +374,26 @@ __MCF_CXX(extern "C" {)
 #define __MCF_0_INIT           { __MCF_C(0) }
 #define __MCF_SET_IF(x, ...)    ((void) ((x) && (*(x) = (__VA_ARGS__))))
 
-/* These are necessary when the header is compiled as C89 or C++98.  */
+/* These are necessary when the header is compiled as C89 or C++98. The check
+ * for `_LP64` is for Cygwin and MSYS2.  */
+#ifdef _LP64
+#  define __MCF_INT64    long
+#  define __MCF_INTPTR   long
+#else
+#  define __MCF_INT64    long long
+#  define __MCF_INTPTR   __MCF_64_32(long long, int)
+#endif
+
+#if !defined LLONG_MAX
+typedef __MCF_INT64 int64_t;
+typedef __MCF_INTPTR intptr_t;
+typedef unsigned __MCF_INT64 uint64_t;
+typedef unsigned __MCF_INTPTR uintptr_t;
+#  define LLONG_MAX  0x7FFFFFFFFFFFFFFFL
+#  define LLONG_MIN  (-0x7FFFFFFFFFFFFFFFL-1)
+#  define ULLONG_MAX  0xFFFFFFFFFFFFFFFFUL
+#endif
+
 #define __MCF_PTR_BITS    __MCF_64_32(64, 32)
 #define __MCF_IPTR_MIN    __MCF_64_32(LLONG_MIN, INT_MIN)
 #define __MCF_IPTR_0      __MCF_64_32(0LL, 0)

meson.build

@@ -349,12 +349,17 @@ lib_mcfgthread_dll = shared_library('mcfgthread',
       version: '.'.join([ ver.get('abi_major'), ver.get('abi_minor'), '0' ]),
       install: true)
 
-lib_mcfgthread_a = static_library('mcfgthread',
-      c_pch: 'mcfgthread/xprecompiled.h',
-      c_args: [ '-ffreestanding', '-fasynchronous-unwind-tables' ],
-      sources: [ mcfgthread_src_min, mcfgthread_src_ex, ],
-      dependencies: [ dep_kernel32, dep_ntdll ],
-      install: true)
+if host_machine.system() == 'cygwin'
+  warning('Static linking is not supported on Cygwin or MSYS2.')
+  lib_mcfgthread_a = lib_mcfgthread_dll
+else
+  lib_mcfgthread_a = static_library('mcfgthread',
+        c_pch: 'mcfgthread/xprecompiled.h',
+        c_args: [ '-ffreestanding', '-fasynchronous-unwind-tables' ],
+        sources: [ mcfgthread_src_min, mcfgthread_src_ex, ],
+        dependencies: [ dep_kernel32, dep_ntdll ],
+        install: true)
+endif
 
 import('pkgconfig').generate(lib_mcfgthread_dll,
       name: 'mcfgthread',

setup_meson.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -e
 
-if ! grep -Eoi '^mingw' /proc/version &>/dev/null
+if ! grep -Eoi '^(mingw|msys|cygwin)' /proc/version &>/dev/null
 then
   _cross_file='--cross-file meson.cross.x86_64-w64-mingw32'
 fi

test/self_oom.c

@@ -13,6 +13,7 @@
 #define NTHREADS  64U
 static HANDLE threads[NTHREADS];
 
+#if !defined __CYGWIN__
 static
 DWORD
 __stdcall
@@ -25,6 +26,7 @@ thread_proc(void* arg)
     fprintf(stderr, "thread %d quitting\n", _MCF_thread_self_tid());
     return 0;
   }
+#endif
 
 int
 main(void)