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FindZLIB: Search under ZLIB_ROOT if it is set 

Perform multiple separate searches in order.  If ZLIB_ROOT is set search
it exclusively so it takes precedence over CMAKE_PREFIX_PATH.  This
allows a user to provide -DZLIB_ROOT=/path/to/zlib/prefix on the CMake
command line to tell it exactly where to find zlib.  Otherwise fall back
to a normal search.

Inspired-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Brad King 2011-11-30 08:40:58 -05:00
parent 17388037fd
commit 985dee4f54
1 changed files with 25 additions and 10 deletions
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35
Modules/FindZLIB.cmake
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@ -17,9 +17,12 @@
# ZLIB_MAJOR_VERSION - The major version of zlib
# ZLIB_MINOR_VERSION - The minor version of zlib
# ZLIB_PATCH_VERSION - The patch version of zlib
#
# An includer may set ZLIB_ROOT to a zlib installation root to tell
# this module where to look.
#=============================================================================
# Copyright 2001-2009 Kitware, Inc.
# Copyright 2001-2011 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
@ -31,17 +34,29 @@
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
FIND_PATH(ZLIB_INCLUDE_DIR zlib.h
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\GnuWin32\\Zlib;InstallPath]/include"
)
SET(_ZLIB_SEARCHES)
# Search ZLIB_ROOT first if it is set.
IF(ZLIB_ROOT)
SET(_ZLIB_SEARCH_ROOT PATHS ${ZLIB_ROOT} NO_DEFAULT_PATH)
LIST(APPEND _ZLIB_SEARCHES _ZLIB_SEARCH_ROOT)
ENDIF()
# Normal search.
SET(_ZLIB_SEARCH_NORMAL
PATHS "[HKEY_LOCAL_MACHINE\\SOFTWARE\\GnuWin32\\Zlib;InstallPath]"
"$ENV{PROGRAMFILES}/zlib"
)
LIST(APPEND _ZLIB_SEARCHES _ZLIB_SEARCH_NORMAL)
SET(ZLIB_NAMES z zlib zdll zlib1 zlibd zlibd1)
FIND_LIBRARY(ZLIB_LIBRARY
NAMES
${ZLIB_NAMES}
PATHS
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\GnuWin32\\Zlib;InstallPath]/lib"
)
# Try each search configuration.
FOREACH(search ${_ZLIB_SEARCHES})
FIND_PATH(ZLIB_INCLUDE_DIR NAMES zlib.h ${${search}} PATH_SUFFIXES include)
FIND_LIBRARY(ZLIB_LIBRARY NAMES ${ZLIB_NAMES} ${${search}} PATH_SUFFIXES lib)
ENDFOREACH()
MARK_AS_ADVANCED(ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
IF(ZLIB_INCLUDE_DIR AND EXISTS "${ZLIB_INCLUDE_DIR}/zlib.h")