Am 05.08.2016 um 23:57 schrieb Junio C Hamano:
Johannes Schindelin <> writes:

Hi Junio & René,

On Thu, 4 Aug 2016, Junio C Hamano wrote:

Let's try it this way.  How about this as a replacement?

I like it (with the if (s2) test intead of if (s1), of course). But please
record René as author, maybe mentioning myself with a "Diagnosed-by:"

Hmph.  I cannot do that unilaterally without waiting for René to
respond, though.  In any case, with only header and footer changes,
here is what will appear in 'pu'.

It's fine with me, thanks. :)  Minor comments below.


-- >8 --
From: René Scharfe <>
Date: Thu, 4 Aug 2016 23:56:54 +0200
Subject: [PATCH] nedmalloc: work around overzealous GCC 6 warning

With GCC 6, the strdup() function is declared with the "nonnull"
attribute, stating that it is not allowed to pass a NULL value as

In nedmalloc()'s reimplementation of strdup(), Postel's Law is heeded
and NULL parameters are handled gracefully. GCC 6 complains about that
now because it thinks that NULL cannot be passed to strdup() anyway.

Because the callers in this project of strdup() must be prepared to
call any implementation of strdup() supplied by the platform, so it
is pointless to pretend that it is OK to call it with NULL.

Remove the conditional based on NULL-ness of the input; this
squelches the warning.

My commit message would have been much shorter, probably too short. But perhaps add here: "Check the return value of malloc() instead to make sure we actually got memory to write to."

See for details.

Diagnosed-by: Johannes Schindelin <>
Signed-off-by: René Scharfe <>
Signed-off-by: Junio C Hamano <>
  compat/nedmalloc/nedmalloc.c | 9 ++++-----
  1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/compat/nedmalloc/nedmalloc.c b/compat/nedmalloc/nedmalloc.c
index 677d1b2..2d4ef59 100644
--- a/compat/nedmalloc/nedmalloc.c
+++ b/compat/nedmalloc/nedmalloc.c
@@ -955,12 +955,11 @@ void **nedpindependent_comalloc(nedpool *p, size_t elems, 
size_t *sizes, void **
  char *strdup(const char *s1)
-       char *s2 = 0;
-       if (s1) {
-               size_t len = strlen(s1) + 1;
-               s2 = malloc(len);
+       size_t len = strlen(s1) + 1;
+       char *s2 = malloc(len);

You added this blank line.  OK.

+       if (s2)
                memcpy(s2, s1, len);
-       }
        return s2;

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