Load system libraries the recommended way on Windows

The search order for DLLs on Windows is a bit funny, and for system libraries, it is recommended to use a strict search path.

In practice, this should not make a difference, as the library has been loaded into memory already, and therefore the LoadLibrary() call would just return the handle instead of loading the library again.

Johannes Schindelin (1):
mingw: load system libraries the recommended way

 compat/mingw.c                                      | 3 ++-
 contrib/credential/wincred/git-credential-wincred.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

base-commit: c4df23f7927d8d00e666a3c8d1b3375f1dc8a3c1
Published-As: https://github.com/gitgitgadget/git/releases/tags/pr-55%2Fdscho%2Fmingw-load-sys-dll-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-55/dscho/mingw-load-sys-dll-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/55

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From: Johannes Schindelin <[email protected]>

When we access IPv6-related functions, we load the corresponding system library using the LoadLibrary() function, which is not the recommended way to load system libraries.

In practice, it does not make a difference: the ws2_32.dll library containing the IPv6 functions is already loaded into memory, so LoadLibrary() simply reuses the already-loaded library.

Still, recommended way is recommended way, so let's use that instead.

While at it, also adjust the code in contrib/ that loads system libraries.

---
 compat/mingw.c                                      | 3 ++-
 contrib/credential/wincred/git-credential-wincred.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

index 18caf2196..9fd7db571 100644
@@ -1577,7 +1577,8 @@ static void ensure_socket_initialization(void)
 			WSAGetLastError());
 
 	for (name = libraries; *name; name++) {
-		ipv6_dll = LoadLibrary(*name);
+		ipv6_dll = LoadLibraryExA(*name, NULL,
+					  LOAD_LIBRARY_SEARCH_SYSTEM32);
 		if (!ipv6_dll)
 			continue;
 

index 86518cd93..5bdad41de 100644
@@ -75,7 +75,8 @@ static CredDeleteWT CredDeleteW;
 static void load_cred_funcs(void)
 {
 	/* load DLLs */
-	advapi = LoadLibrary("advapi32.dll");
+	advapi = LoadLibraryExA("advapi32.dll", NULL,
+				LOAD_LIBRARY_SEARCH_SYSTEM32);
 	if (!advapi)
 		die("failed to load advapi32.dll");
 

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