cmake: Detect __func__ and __FUNCTION__ during configure step

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

ConfigureChecks.cmake

@@ -201,6 +201,20 @@ int main(void)
     return 0;
 }" HAVE_GCC_VOLATILE_MEMORY_PROTECTION)
 
+check_c_source_compiles("
+#include <stdio.h>
+int main(void) {
+    printf(\"%s\", __func__);
+    return 0;
+}" HAVE_COMPILER__FUNC__)
+
+check_c_source_compiles("
+#include <stdio.h>
+int main(void) {
+    printf(\"%s\", __FUNCTION__);
+    return 0;
+}" HAVE_COMPILER__FUNCTION__)
+
 if (WITH_DEBUG_CRYPTO)
   set(DEBUG_CRYPTO 1)
 endif (WITH_DEBUG_CRYPTO)

config.h.cmake

@@ -139,6 +139,9 @@
 
 #cmakedefine HAVE_GCC_VOLATILE_MEMORY_PROTECTION 1
 
+#cmakedefine HAVE_COMPILER__FUNC__ 1
+#cmakedefine HAVE_COMPILER__FUNCTION__ 1
+
 /* Define to 1 if you want to enable GSSAPI */
 #cmakedefine WITH_GSSAPI 1
 

include/libssh/pki_priv.h

@@ -29,7 +29,7 @@
 #define ECDSA_HEADER_END "-----END EC PRIVATE KEY-----"
 
 #define ssh_pki_log(...) \
-    _ssh_pki_log(__FUNCTION__, __VA_ARGS__)
+    _ssh_log(SSH_LOG_FUNCTIONS, __func__, __VA_ARGS__)
 void _ssh_pki_log(const char *function,
                   const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
 

include/libssh/priv.h

@@ -139,8 +139,12 @@ int gettimeofday(struct timeval *__p, void *__t);
 #define MAX_BUF_SIZE 4096
 #endif
 
-#ifndef __func__
+#ifndef HAVE_COMPILER__FUNC__
+# ifdef HAVE_COMPILER__FUNCTION__
 #  define __func__ __FUNCTION__
+# else
+#  error "Your system must provide a __func__ macro"
+# endif
 #endif
 
 #if defined(HAVE_GCC_THREAD_LOCAL_STORAGE)