Suppress Visual Studio warnings in bundled libs

We don't have control over the code of these bundled libs, hence we
suppress some special warnings:

- C4267: conversion from ... to ..., possible loss of data

- C4996: The POSIX name for this item is deprecated.
         Instead, use the ISO C++ conformant name ...

1 files changed, 44 insertions, 24 deletions

diff --git a/zlib/CMakeLists.txt b/zlib/CMakeLists.txt
index c74df9240..33d6f5809 100644
--- a/zlib/CMakeLists.txt
+++ b/zlib/CMakeLists.txt
@@ -1,35 +1,55 @@
 
 # source files for zlib
-set(ZLIB_SRCS
-    adler32.c
-    compress.c
-    crc32.c
-    deflate.c
-    gzclose.c
-    gzlib.c
-    gzread.c
-    gzwrite.c
-    inflate.c
-    infback.c
-    inftrees.c
-    inffast.c
-    trees.c
-    uncompr.c
-    zutil.c
+set (ZLIB_SRCS
+      adler32.c
+      compress.c
+      crc32.c
+      deflate.c
+      gzclose.c
+      gzlib.c
+      gzread.c
+      gzwrite.c
+      inflate.c
+      infback.c
+      inftrees.c
+      inffast.c
+      trees.c
+      uncompr.c
+      zutil.c
 )
 
 #######################################################################
-FL_ADD_LIBRARY(fltk_z STATIC "${ZLIB_SRCS}")
-# install the zlib headers
-install(FILES zconf.h;zlib.h;zutil.h
-    DESTINATION ${FLTK_INCLUDEDIR}/FL/images
-)
+
+# Suppress some Visual Studio compiler warnings
+set (msvc_warnings /wd4267 /wd4996)
+
+#######################################################################
+# Build the static library
+#######################################################################
+
+FL_ADD_LIBRARY (fltk_z STATIC "${ZLIB_SRCS}")
+
+if (MSVC)
+  target_compile_options (fltk_z PRIVATE ${msvc_warnings})
+endif (MSVC)
 
 #######################################################################
-if(OPTION_BUILD_SHARED_LIBS)
+# Build the shared library (optional)
 #######################################################################
-FL_ADD_LIBRARY(fltk_z SHARED "${ZLIB_SRCS}")
+
+if (OPTION_BUILD_SHARED_LIBS)
+  FL_ADD_LIBRARY (fltk_z SHARED "${ZLIB_SRCS}")
+
+  if (MSVC)
+    target_compile_options (fltk_z_SHARED PRIVATE ${msvc_warnings})
+  endif (MSVC)
+
+endif (OPTION_BUILD_SHARED_LIBS)
 
 #######################################################################
-endif(OPTION_BUILD_SHARED_LIBS)
+# Install the library headers
 #######################################################################
+
+install (FILES zconf.h zlib.h zutil.h
+         DESTINATION ${FLTK_INCLUDEDIR}/FL/images
+)