t/helper/zlib-compile-flags: read zlib flags

zlib provides a convenience function that indicates the sizeOf
the standard types. Windows builds should test if their zlib
supports >4Gb address space for large file support.

Also update the t-large-files-on-windows.sh test script to
record the zlibFlags

Signed-off-by: Philip Oakley <[email protected]>

Makefile

@@ -758,6 +758,7 @@ TEST_BUILTINS_OBJS += test-xml-encode.o
 TEST_BUILTINS_OBJS += test-wildmatch.o
 TEST_BUILTINS_OBJS += test-windows-named-pipe.o
 TEST_BUILTINS_OBJS += test-write-cache.o
+TEST_BUILTINS_OBJS += test-zlib-compile-flags.o
 
 # Do not add more tests here unless they have extra dependencies. Add
 # them in TEST_BUILTINS_OBJS above.

t/helper/test-tool.c

@@ -70,6 +70,7 @@ static struct test_cmd cmds[] = {
 	{ "windows-named-pipe", cmd__windows_named_pipe },
 #endif
 	{ "write-cache", cmd__write_cache },
+	{ "zlib-compile-flags", cmd__zlib_compile_flags },
 };
 
 static NORETURN void die_usage(void)

t/helper/test-tool.h

@@ -60,6 +60,7 @@ int cmd__wildmatch(int argc, const char **argv);
 int cmd__windows_named_pipe(int argc, const char **argv);
 #endif
 int cmd__write_cache(int argc, const char **argv);
+int cmd__zlib_compile_flags(int argc, const char **argv);
 
 int cmd_hash_impl(int ac, const char **av, int algo);
 

t/helper/test-zlib-compile-flags.c

@@ -0,0 +1,9 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+#include <zlib.h>
+
+int cmd__zlib_compile_flags(int argc, const char **argv)
+{
+	printf("%lu\n", zlibCompileFlags());
+	return 0;
+}

t/t-large-files-on-windows.sh

@@ -5,6 +5,7 @@ test_description='test large file handling on windows'
 
 test_expect_success SIZE_T_IS_64BIT 'require 64bit size_t' '
 
+	test-tool zlib-compile-flags >zlibFlags.txt &&
 	dd if=/dev/zero of=file bs=1M count=4100 &&
 	git config core.compression 0 &&
 	git config core.looseCompression 0 &&