Allow re-enabling @rpath on OS/X when using relative install prefix

CMakeLists.txt

@@ -966,8 +966,15 @@ else()
   set(PC_INC_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR}")
 endif()
 
+if(APPLE)
+  option(WITH_RPATH "Enable RPATH for shared library" OFF)
+endif()
 if(NOT IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
-  set(PC_LIB_INSTALL_DIR "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
+  if(APPLE AND WITH_RPATH)
+    set(PC_LIB_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}")
+  else()
+    set(PC_LIB_INSTALL_DIR "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
+  endif()
 elseif(LIBDIR_POS EQUAL 0)
   string(SUBSTRING "${CMAKE_INSTALL_LIBDIR}" "${INSTALL_PREFIX_LEN}" "-1" LIBDIR_RELATIVE)
   set(PC_LIB_INSTALL_DIR "\${exec_prefix}/${LIBDIR_RELATIVE}")
@@ -1135,9 +1142,11 @@ if(NOT DEFINED BUILD_SHARED_LIBS OR BUILD_SHARED_LIBS)
         if(NOT APPLE)
             set_target_properties(zlib PROPERTIES LINK_FLAGS
                 "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib${SUFFIX}.map\"")
+        elseif(IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}" OR NOT WITH_RPATH)
+            # Match configure/make's behavior (i.e. don't use @rpath on mac when using absolute path).
+            set_target_properties(zlib PROPERTIES INSTALL_NAME_DIR "@rpath/${CMAKE_INSTALL_FULL_LIBDIR}")
         else()
-            # Match configure/make's behavior (i.e. don't use @rpath on mac).
-            set_target_properties(zlib PROPERTIES INSTALL_NAME_DIR "${CMAKE_INSTALL_FULL_LIBDIR}")
+            set_target_properties(zlib PROPERTIES INSTALL_NAME_DIR "@rpath/${CMAKE_INSTALL_LIBDIR}")
         endif()
     endif()
     if(MSYS)
@@ -1174,6 +1183,10 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/zlib${SUFFIX}.h.in
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/gzread.c.in
     ${CMAKE_CURRENT_BINARY_DIR}/gzread.c @ONLY)
 
+# Fix install directory after generating zlib.pc/zlib-ng.pc
+if (NOT IS_ABSOLUTE CMAKE_INSTALL_LIBDIR AND WITH_RPATH)
+    set(CMAKE_INSTALL_LIBDIR "/${CMAKE_INSTALL_LIBDIR}")
+endif()
 
 if (NOT ZLIB_SYMBOL_PREFIX STREQUAL "")
     add_feature_info(ZLIB_SYMBOL_PREFIX ON "Publicly exported symbols have a custom prefix")
@@ -1273,4 +1286,8 @@ endif()
 
 add_feature_info(INSTALL_UTILS INSTALL_UTILS "Copy minigzip and minideflate during install")
 
+if(APPLE)
+    add_feature_info(WITH_RPATH WITH_RPATH "Enable RPATH for shared library")
+endif()
+
 FEATURE_SUMMARY(WHAT ALL INCLUDE_QUIET_PACKAGES)

configure

@@ -513,7 +513,12 @@ if test "$gcc" -eq 1 && ($cc $CFLAGS -c $test.c) >> configure.log 2>&1; then
              SHAREDLIBM=${LIBNAME}.$VER1$shared_ext
              SHAREDTARGET=$SHAREDLIBV
              LDSHARED=${LDSHARED-"$cc"}
-             LDSHAREDFLAGS="-dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"
+             case ${libdir} in
+             /*)
+                 LDSHAREDFLAGS="-dynamiclib -install_name ${libdir}/${SHAREDLIBM} -compatibility_version ${VER1} -current_version ${VER3}" ;;
+             *)
+                 LDSHAREDFLAGS="-dynamiclib -install_name @rpath/${libdir}/${SHAREDLIBM} -compatibility_version ${VER1} -current_version ${VER3}" ;;
+             esac
              if libtool -V 2>&1 | grep Apple > /dev/null; then
                  AR="libtool"
              else

test/pkgcheck.sh

@@ -47,10 +47,6 @@ _EOF_
 
 set -ex
 
-# Caller can also set CMAKE_ARGS or CONFIGURE_ARGS if desired
-CMAKE_ARGS="-DCMAKE_INSTALL_LIBDIR=lib ${CMAKE_ARGS}"
-CONFIGURE_ARGS=${CONFIGURE_ARGS}
-
 case "$1" in
 --zlib-compat)
   suffix=""
@@ -85,6 +81,11 @@ Darwin)
   sysctl -n machdep.cpu.features
   sysctl -n machdep.cpu.leaf7_features
   sysctl -n machdep.cpu.extfeatures
+  CMAKE_ARGS="-DCMAKE_INSTALL_LIBDIR=lib -DPKGCONFIG_INSTALL_DIR=/lib/pkgconfig -DWITH_RPATH=on ${CMAKE_ARGS}"
+  CONFIGURE_ARGS="--libdir=lib ${CONFIGURE_ARGS}"
+  ;;
+*)
+  CMAKE_ARGS="-DCMAKE_INSTALL_LIBDIR=lib ${CMAKE_ARGS}"
   ;;
 esac
 
@@ -117,7 +118,7 @@ cd ..
 # Original build system
 rm -rf btmp1 pkgtmp1
 mkdir btmp1 pkgtmp1
-export DESTDIR=$(pwd)/pkgtmp1
+export DESTDIR=$(pwd)/pkgtmp1/
 cd btmp1
   case $(uname) in
   Darwin)
@@ -130,13 +131,15 @@ cd btmp1
 cd ..
 
 repack_ar() {
-  if ! cmp --silent pkgtmp1/usr/local/lib/libz$suffix.a pkgtmp2/usr/local/lib/libz$suffix.a
+  archive1=$(cd pkgtmp1; find . -type f -name '*.a'; cd ..)
+  archive2=$(cd pkgtmp2; find . -type f -name '*.a'; cd ..)
+  if ! cmp --silent pkgtmp1/$archive1 pkgtmp2/$archive2
   then
     echo "libz$suffix.a does not match.  Probably filenames differ (.o vs .c.o).  Unpacking and renaming..."
     # Note: %% is posix shell syntax meaning "Remove Largest Suffix Pattern", see
     # https://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
-    cd pkgtmp1; ar x usr/local/lib/libz$suffix.a; rm usr/local/lib/libz$suffix.a; cd ..
-    cd pkgtmp2; ar x usr/local/lib/libz$suffix.a; rm usr/local/lib/libz$suffix.a; for a in *.c.o; do mv $a ${a%%.c.o}.o; done; cd ..
+    cd pkgtmp1; ar x $archive1; rm $archive1; cd ..
+    cd pkgtmp2; ar x $archive2; rm $archive2; for a in *.c.o; do mv $a ${a%%.c.o}.o; done; cd ..
     # Also, remove __.SYMDEF SORTED if present, as it has those funky .c.o names embedded in it.
     rm -f pkgtmp[12]/__.SYMDEF\ SORTED
   fi