packages/zlib/patches/zlib-1.2.3-visibility-support.patch

   1 Only export symbols that should be exported.
   2
   3 Patch by Mike Frysinger
   4
   5 http://bugs.gentoo.org/32764
   6 http://bugs.gentoo.org/149929
   7
   8 --- zlib-1.2.3/configure
   9 +++ zlib-1.2.3/configure
  10 @@ -209,6 +209,20 @@
  11  fi
  12
  13  cat > $test.c <<EOF
  14 +int foo __attribute__ ((visibility ("hidden")));
  15 +int main()
  16 +{
  17 +  return 0;
  18 +}
  19 +EOF
  20 +if ($CC -c -fvisibility=hidden $CFLAGS $test.c) 2>/dev/null; then
  21 +  CFLAGS="$CFLAGS -DHAS_attribute_visibility -fvisibility=hidden"
  22 +  echo "Checking for attribute(visibility) support... Yes."
  23 +else
  24 +  echo "Checking for attribute(visibility) support... No."
  25 +fi
  26 +
  27 +cat > $test.c <<EOF
  28  #include <stdio.h>
  29  #include <stdarg.h>
  30  #include "zconf.h"
  31 --- zlib-1.2.3/zconf.in.h
  32 +++ zlib-1.2.3/zconf.in.h
  33 @@ -244,7 +244,11 @@
  34  #endif
  35
  36  #ifndef ZEXTERN
  37 -#  define ZEXTERN extern
  38 +#  if defined(ZLIB_INTERNAL) && defined(HAS_attribute_visibility)
  39 +#    define ZEXTERN extern __attribute__ ((visibility("default")))
  40 +#  else
  41 +#    define ZEXTERN extern
  42 +#  endif
  43  #endif
  44  #ifndef ZEXPORT
  45  #  define ZEXPORT