[patches] [PATCH] Fix FreeBSD build

[Konstantin Belyavskiy]

Under FreeBSD getline prototype is not provided by
default due to compatibility problems.
So first check in CMake with check_function_exists to
make sure that getline provided by the system.
Then try to compile small code to test if declaration
is also available. If not declare function in code.

Closes #3217.
---
branch: gh-3217-enable-getline-prototype-freebsd
 CMakeLists.txt            | 18 ++++++++++++++++++
 src/trivia/config.h.cmake |  6 ++++++
 2 files changed, 24 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d0cae0f01..86f5bd0d3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -127,6 +127,24 @@ check_library_exists("" __libc_stack_end "" HAVE_LIBC_STACK_END)
 check_function_exists(setproctitle HAVE_SETPROCTITLE)
 check_function_exists(setprogname HAVE_SETPROGNAME)
 check_function_exists(getprogname HAVE_GETPROGNAME)
+check_function_exists(getline HAVE_GETLINE)
+if (HAVE_GETLINE)
+    set(CMAKE_REQUIRED_FLAGS "-Werror")
+    check_c_source_compiles("
+        #include <stdio.h>
+        int main(void)
+        {
+            FILE *fp = NULL;
+            char *line = NULL;
+            size_t len = 0;
+            getline(&line, &len, fp);
+            return 0;
+        }
+        " HAVE_GETLINE_DECL)
+    set(CMAKE_REQUIRED_FLAGS "")
+else ()
+    message(FATAL_ERROR "getline is not provided by libraries on the system")
+endif ()
 
 #
 # Enable 'make tags' target.
diff --git a/src/trivia/config.h.cmake b/src/trivia/config.h.cmake
index 66ddba994..63c8856a9 100644
--- a/src/trivia/config.h.cmake
+++ b/src/trivia/config.h.cmake
@@ -42,6 +42,12 @@
 #define TARANTOOL_LIBEXT "so"
 #endif
 
+#cmakedefine HAVE_GETLINE_DECL
+#ifndef HAVE_GETLINE_DECL
+#include <stdio.h>
+extern ssize_t getline(char **lineptr, size_t *n, FILE *stream);;
+#endif
+
 /**
  * Defined if cpuid() instruction is available.
  */
-- 
2.14.3 (Apple Git-98)