common: fix compilation when strnlen, strnup and memrchr are not available

Add a few casts to fix build failure when these functions are not
available.  For example:

      CXX      lttng-conf.o
In file included from /home/smarchi/src/lttng-tools/src/common/macros.h:15:0,
                 from /home/smarchi/src/lttng-tools/src/common/error.h:19,
                 from /home/smarchi/src/lttng-tools/src/common/common.h:12,
                 from /home/smarchi/src/lttng-tools/src/bin/lttng/conf.cpp:18:
/home/smarchi/src/lttng-tools/src/common/compat/string.h: In function ‘size_t lttng_strnlen(const char*, size_t)’:
/home/smarchi/src/lttng-tools/src/common/compat/string.h:28:14: error: invalid conversion from ‘const void*’ to ‘const char*’ [-fpermissive]
  end = memchr(str, 0, max);
        ~~~~~~^~~~~~~~~~~~~

This can be tested by modifying config.cache and setting the relevant
config variables to "no".

Change-Id: Ieb6debf32c82927767ad32d2f4aa62fb829a9f9f
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/common/compat/string.h b/src/common/compat/string.h
index c9aa7f7fa099e3575b9a565176768a6bf6c4b134..fd4f2f021c38c29e7df97567270e3b103cbff0b6 100644 (file)
--- a/src/common/compat/string.h
+++ b/src/common/compat/string.h
@@ -25,7 +25,7 @@ size_t lttng_strnlen(const char *str, size_t max)
        size_t ret;
        const char *end;
 
-       end = memchr(str, 0, max);
+       end = (const char *) memchr(str, 0, max);
 
        if (end) {
                ret = (size_t) (end - str);
@@ -61,7 +61,7 @@ char *lttng_strndup(const char *s, size_t n)
                navail = n + 1;
        }
 
-       ret = malloc(navail);
+       ret = (char *) malloc(navail);
        if (!ret) {
                goto end;
        }
@@ -120,7 +120,7 @@ static inline
 void *lttng_memrchr(const void *s, int c, size_t n)
 {
        int i;
-       const char *str = s;
+       const char *str = (const char *) s;
        for (i = n-1; i >= 0; i--) {
                if (str[i] == (char)c) {
                        return (void *)(str+i);