Move our implementation of strdup(3) out of compat/nedmalloc/ and allow
it to be used independently from USE_NED_ALLOCATOR.  This reduces the
difference of our copy of nedmalloc from the original, making it easier
to update, and allows for easier testing and reusing of our version of
strdup().

Signed-off-by: Rene Scharfe <l....@web.de>
---
 Makefile                     | 17 ++++++++++++++---
 compat/nedmalloc/nedmalloc.c | 16 ----------------
 compat/strdup.c              | 11 +++++++++++
 git-compat-util.h            |  8 ++++++++
 4 files changed, 33 insertions(+), 19 deletions(-)
 create mode 100644 compat/strdup.c

diff --git a/Makefile b/Makefile
index d96ecb7..7f18492 100644
--- a/Makefile
+++ b/Makefile
@@ -296,6 +296,11 @@ all::
 # Define USE_NED_ALLOCATOR if you want to replace the platforms default
 # memory allocators with the nedmalloc allocator written by Niall Douglas.
 #
+# Define OVERRIDE_STRDUP to override the libc version of strdup(3).
+# This is necessary when using a custom allocator in order to avoid
+# crashes due to allocation and free working on different 'heaps'.
+# It's defined automatically if USE_NED_ALLOCATOR is set.
+#
 # Define NO_REGEX if you have no or inferior regex support in your C library.
 #
 # Define HAVE_DEV_TTY if your system can open /dev/tty to interact with the
@@ -1456,8 +1461,14 @@ ifdef NATIVE_CRLF
 endif
 
 ifdef USE_NED_ALLOCATOR
-       COMPAT_CFLAGS += -Icompat/nedmalloc
-       COMPAT_OBJS += compat/nedmalloc/nedmalloc.o
+       COMPAT_CFLAGS += -Icompat/nedmalloc
+       COMPAT_OBJS += compat/nedmalloc/nedmalloc.o
+       OVERRIDE_STRDUP = YesPlease
+endif
+
+ifdef OVERRIDE_STRDUP
+       COMPAT_CFLAGS += -DOVERRIDE_STRDUP
+       COMPAT_OBJS += compat/strdup.o
 endif
 
 ifdef GIT_TEST_CMP_USE_COPIED_CONTEXT
@@ -2029,7 +2040,7 @@ endif
 
 ifdef USE_NED_ALLOCATOR
 compat/nedmalloc/nedmalloc.sp compat/nedmalloc/nedmalloc.o: EXTRA_CPPFLAGS = \
-       -DNDEBUG -DOVERRIDE_STRDUP -DREPLACE_SYSTEM_ALLOCATOR
+       -DNDEBUG -DREPLACE_SYSTEM_ALLOCATOR
 compat/nedmalloc/nedmalloc.sp: SPARSE_FLAGS += -Wno-non-pointer-null
 endif
 
diff --git a/compat/nedmalloc/nedmalloc.c b/compat/nedmalloc/nedmalloc.c
index 2d4ef59..1cc31c3 100644
--- a/compat/nedmalloc/nedmalloc.c
+++ b/compat/nedmalloc/nedmalloc.c
@@ -948,22 +948,6 @@ void **nedpindependent_comalloc(nedpool *p, size_t elems, 
size_t *sizes, void **
        return ret;
 }
 
-#ifdef OVERRIDE_STRDUP
-/*
- * This implementation is purely there to override the libc version, to
- * avoid a crash due to allocation and free on different 'heaps'.
- */
-char *strdup(const char *s1)
-{
-       size_t len = strlen(s1) + 1;
-       char *s2 = malloc(len);
-
-       if (s2)
-               memcpy(s2, s1, len);
-       return s2;
-}
-#endif
-
 #if defined(__cplusplus)
 }
 #endif
diff --git a/compat/strdup.c b/compat/strdup.c
new file mode 100644
index 0000000..f3fb978
--- /dev/null
+++ b/compat/strdup.c
@@ -0,0 +1,11 @@
+#include "../git-compat-util.h"
+
+char *gitstrdup(const char *s1)
+{
+       size_t len = strlen(s1) + 1;
+       char *s2 = malloc(len);
+
+       if (s2)
+               memcpy(s2, s1, len);
+       return s2;
+}
diff --git a/git-compat-util.h b/git-compat-util.h
index db89ba7..93f6f23 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -663,6 +663,14 @@ void *gitmemmem(const void *haystack, size_t haystacklen,
                 const void *needle, size_t needlelen);
 #endif
 
+#ifdef OVERRIDE_STRDUP
+#ifdef strdup
+#undef strdup
+#endif
+#define strdup gitstrdup
+char *gitstrdup(const char *s);
+#endif
+
 #ifdef NO_GETPAGESIZE
 #define getpagesize() sysconf(_SC_PAGESIZE)
 #endif
-- 
2.10.0

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