make dllexport work with compilers other than MSVC

the issue is, flac and metaflac exes rely on flac_internal_???_utf8()
procedures from windows_unicode_filenames.c and there is no easy way
to exclude them from exports without breaking things. So export them
explicitly (they are exported anyway w/o this patch), but add a FIXME
note about the kludge in windows_unicode_filenames.c.

configure.ac

@@ -493,6 +493,22 @@ if test x$enable_stack_smash_protection = "xyes" ; then
 	XIPH_GXX_STACK_PROTECTOR
 	fi
 
+AH_VERBATIM([FLAC_API_EXPORTS],
+[/* libtool defines DLL_EXPORT for windows dll builds,
+   but flac code relies on FLAC_API_EXPORTS instead. */
+#ifdef DLL_EXPORT
+#ifdef __cplusplus
+# define FLACPP_API_EXPORTS
+#else
+# define FLAC_API_EXPORTS
+#endif
+#endif])
+
+if test x$enable_shared != "xyes" ; then
+dnl for correct FLAC_API
+	CPPFLAGS="-DFLAC__NO_DLL $CPPFLAGS"
+	fi
+
 AC_CONFIG_FILES([ \
 	Makefile \
 	src/Makefile \

include/FLAC++/export.h

@@ -59,7 +59,7 @@
 #if defined(FLAC__NO_DLL)
 #define FLACPP_API
 
-#elif defined(_MSC_VER)
+#elif defined(_WIN32)
 #ifdef FLACPP_API_EXPORTS
 #define	FLACPP_API __declspec(dllexport)
 #else

include/FLAC/export.h

@@ -59,7 +59,7 @@
 #if defined(FLAC__NO_DLL)
 #define FLAC_API
 
-#elif defined(_MSC_VER)
+#elif defined(_WIN32)
 #ifdef FLAC_API_EXPORTS
 #define	FLAC_API __declspec(dllexport)
 #else

src/libFLAC/windows_unicode_filenames.c

@@ -37,6 +37,9 @@
 #include <windows.h>
 #include "share/windows_unicode_filenames.h"
 
+/*** FIXME: KLUDGE: export these syms for flac.exe, metaflac.exe, etc. ***/
+#include "FLAC/export.h"
+
 /* convert UTF-8 back to WCHAR. Caller is responsible for freeing memory */
 static wchar_t *wchar_from_utf8(const char *str)
 {
@@ -61,19 +64,19 @@ static wchar_t *wchar_from_utf8(const char *str)
 static FLAC__bool utf8_filenames = false;
 
 
-void flac_internal_set_utf8_filenames(FLAC__bool flag)
+FLAC_API void flac_internal_set_utf8_filenames(FLAC__bool flag)
 {
 	utf8_filenames = flag ? true : false;
 }
 
-FLAC__bool flac_internal_get_utf8_filenames(void)
+FLAC_API FLAC__bool flac_internal_get_utf8_filenames(void)
 {
 	return utf8_filenames;
 }
 
 /* file functions */
 
-FILE* flac_internal_fopen_utf8(const char *filename, const char *mode)
+FLAC_API FILE* flac_internal_fopen_utf8(const char *filename, const char *mode)
 {
 	if (!utf8_filenames) {
 		return fopen(filename, mode);
@@ -95,7 +98,7 @@ FILE* flac_internal_fopen_utf8(const char *filename, const char *mode)
 	}
 }
 
-int flac_internal_stat64_utf8(const char *path, struct __stat64 *buffer)
+FLAC_API int flac_internal_stat64_utf8(const char *path, struct __stat64 *buffer)
 {
 	if (!utf8_filenames) {
 		return _stat64(path, buffer);
@@ -111,7 +114,7 @@ int flac_internal_stat64_utf8(const char *path, struct __stat64 *buffer)
 	}
 }
 
-int flac_internal_chmod_utf8(const char *filename, int pmode)
+FLAC_API int flac_internal_chmod_utf8(const char *filename, int pmode)
 {
 	if (!utf8_filenames) {
 		return _chmod(filename, pmode);
@@ -127,7 +130,7 @@ int flac_internal_chmod_utf8(const char *filename, int pmode)
 	}
 }
 
-int flac_internal_utime_utf8(const char *filename, struct utimbuf *times)
+FLAC_API int flac_internal_utime_utf8(const char *filename, struct utimbuf *times)
 {
 	if (!utf8_filenames) {
 		return utime(filename, times);
@@ -146,7 +149,7 @@ int flac_internal_utime_utf8(const char *filename, struct utimbuf *times)
 	}
 }
 
-int flac_internal_unlink_utf8(const char *filename)
+FLAC_API int flac_internal_unlink_utf8(const char *filename)
 {
 	if (!utf8_filenames) {
 		return _unlink(filename);
@@ -162,7 +165,7 @@ int flac_internal_unlink_utf8(const char *filename)
 	}
 }
 
-int flac_internal_rename_utf8(const char *oldname, const char *newname)
+FLAC_API int flac_internal_rename_utf8(const char *oldname, const char *newname)
 {
 	if (!utf8_filenames) {
 		return rename(oldname, newname);