The man page of fopen says :

"This is strictly for compatibility with C89 and has no effect; the 'b' is ignored on all POSIX conforming systems, including Linux."

I don't know where you're running this, but sure :)

Reviewed-by: Lionel Landwerlin <[email protected]>

On 10/01/17 14:38, Sebastian Olender wrote:
Signed-off-by: Sebastian Olender <[email protected]>
---
  tests/util/piglit-util-png.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/util/piglit-util-png.c b/tests/util/piglit-util-png.c
index 4835ed6..c63ec7b 100644
--- a/tests/util/piglit-util-png.c
+++ b/tests/util/piglit-util-png.c
@@ -87,7 +87,7 @@ piglit_write_png(const char *filename,
                break;
        }
- fp = fopen(filename, "w");
+       fp = fopen(filename, "wb");
        if (!fp)
                abortf("failed to open `%s'", filename);


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