There are already set_die_routine() and set_error_routine(),
so let's add set_warn_routine() as this will be needed in a
following commit.

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 git-compat-util.h | 1 +
 usage.c           | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/git-compat-util.h b/git-compat-util.h
index db89ba7..d189b4f 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -440,6 +440,7 @@ static inline int const_error(void)
 
 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, 
va_list params));
 extern void set_error_routine(void (*routine)(const char *err, va_list 
params));
+extern void set_warn_routine(void (*routine)(const char *warn, va_list 
params));
 extern void set_die_is_recursing_routine(int (*routine)(void));
 extern void set_error_handle(FILE *);
 
diff --git a/usage.c b/usage.c
index 1dad03f..67e5526 100644
--- a/usage.c
+++ b/usage.c
@@ -70,6 +70,11 @@ void set_error_routine(void (*routine)(const char *err, 
va_list params))
        error_routine = routine;
 }
 
+void set_warn_routine(void (*routine)(const char *warn, va_list params))
+{
+       warn_routine = routine;
+}
+
 void set_die_is_recursing_routine(int (*routine)(void))
 {
        die_is_recursing = routine;
-- 
2.10.0.41.g9df52c3

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