core: enable iconv(3) in cmake

Enable optional iconv in fluent-bit

Enabled by  -D FLB_ICONV=Yes (default No)

Requires libiconv-library (can be embedded to libc)

Signed-off-by: Jukka Pihl <[email protected]>

Author: bluebike

CMakeLists.txt

@@ -68,6 +68,7 @@ option(FLB_SYSTEM_STRPTIME    "Use strptime in system libc"  Yes)
 option(FLB_STATIC_CONF        "Build binary using static configuration")
 option(FLB_STREAM_PROCESSOR   "Enable Stream Processor"      Yes)
 option(FLB_CORO_STACK_SIZE    "Set coroutine stack size")
+option(FLB_ICONV              "Enable iconv string decoding"  No)
 
 # Metrics: Experimental Feature, disabled by default on 0.12 series
 # but enabled in the upcoming 0.13 release. Note that development
@@ -153,6 +154,7 @@ if(FLB_ALL)
   # Global
   set(FLB_DEBUG        1)
   set(FLB_TLS          1)
+  set(FLB_ICONV        1)
 
   # Input plugins
   set(FLB_IN_CPU       1)
@@ -182,6 +184,7 @@ if(FLB_ALL)
   set(FLB_OUT_STDOUT   1)
   set(FLB_OUT_LIB      1)
   set(FLB_OUT_FLOWCOUNTER 1)
+
 endif()
 
 if(FLB_DEV)
@@ -577,6 +580,67 @@ if(FLB_INOTIFY)
   endif()
 endif()
 
+# iconv
+if(FLB_ICONV)
+
+  if(CMAKE_VERSION VERSION_LESS 3.11.0)
+     message("cmake older than 3.11.0 .. no FindIconv module... testing here")
+     if(NOT DEFINED Iconv_IS_BUILT_IN)
+       if(DEFINED Iconv_INCLUDE_DIR AND NOT DEFINED Iconv_LIBRARY)
+          check_c_source_compiles(
+                "
+                #include <stddef.h>
+                #include <iconv.h>
+                int main() {
+                  char *a, *b;
+                  size_t i, j;
+                  iconv_t ic;
+                  ic = iconv_open(\"to\", \"from\");
+                  iconv(ic, &a, &i, &b, &j);
+                  iconv_close(ic);
+                }
+                " Iconv_IS_BUILT_IN)
+       endif()
+    endif()
+    if(NOT Iconv_IS_BUILT_IN)
+      if(DEFINED Iconv_INCLUDE_DIR AND NOT DEFINED Iconv_LIBRARIES)
+        set(CMAKE_REQUIRED_LIBRARIES  "iconv")
+        check_c_source_compiles(
+                "
+                #include <stddef.h>
+                #include <iconv.h>
+                int main() {
+                  char *a, *b;
+                  size_t i, j;
+                  iconv_t ic;
+                  ic = iconv_open(\"to\", \"from\");
+                  iconv(ic, &a, &i, &b, &j);
+                  iconv_close(ic);
+                }
+                " Iconv_FOUND)
+        if(Iconv_FOUND)
+	   set(Iconv_LIBRARIES "iconv")
+        endif()
+      endif()
+    endif()
+    
+  else()
+    include(FindIconv)
+  endif()
+
+  if(Iconv_IS_BUILT_IN)
+    message("Iconv_IS_BUILT_IN builtin is defined")
+    FLB_DEFINITION(FLB_HAVE_ICONV)
+  elseif(Iconv_LIBRARIES)
+    message("Iconv_LIBRARIES defined '${Iconv_LIBRARIES}'")
+    FLB_DEFINITION(FLB_HAVE_ICONV)
+  else()
+    message("FLB_ICONV defined iconv not given")
+    set(FLB_ICONV NO)
+  endif()
+
+endif()
+
 configure_file(
   "${PROJECT_SOURCE_DIR}/include/fluent-bit/flb_info.h.in"
   "${PROJECT_SOURCE_DIR}/include/fluent-bit/flb_info.h"

src/CMakeLists.txt

@@ -78,6 +78,20 @@ if(FLB_TLS)
     )
 endif()
 
+# iconv
+if(FLB_ICONV)
+  set(src
+     ${src}
+     "flb_iconv.c"
+     )
+  if(NOT Iconv_IS_BUILT_IN)
+    set(extra_libs
+      ${extra_libs}
+      ${Iconv_LIBRARIES}
+    )
+  endif()
+endif()
+
 if(FLB_PROXY_GO)
   set(src
     ${src}