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IDProjectCategoryView StatusDate SubmittedLast Update
0014591CMakeCMakepublic2013-11-22 05:002014-06-02 08:37
Reporterholtgrewe 
Assigned To 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionno change required 
Platformx86OSWindowsOS Version7
Product VersionCMake 2.8.12 
Target VersionFixed in Version 
Summary0014591: find_path appears to ignore PATH_SUFFIXES
DescriptionI am using the CMakeLists.txt from below and tried it with different CMake versions. Note that the include/zlib.h file exists.

The problem occured with 2.12.1 (see below).
Steps To ReproduceSee below.
Additional InformationC:\Temp\example-build>cmake --version
cmake version 2.8.11.1

C:\Temp\example-build>cmake ..\example -G "Visual Studio 11"
-- The C compiler identification is MSVC 17.0.60610.1
-- The CXX compiler identification is MSVC 17.0.60610.1
-- Check for working C compiler using: Visual Studio 11
-- Check for working C compiler using: Visual Studio 11 -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler using: Visual Studio 11
-- Check for working CXX compiler using: Visual Studio 11 -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- RESULT C:/seqan-contrib-D20130710-x86/vs11/include
-- RESULT2 C:/seqan-contrib-D20130710-x86/vs11/include
-- RESULT3 C:/seqan-contrib-D20130710-x86/vs11/include
-- EXISTS C:/seqan-contrib-D20130710-x86/vs11/include/zlib.h
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Temp/example-build

C:\Temp\example-build>cmake --version
cmake version 2.8.11.2

C:\Temp\example-build>cmake ..\example -G "Visual Studio 11"
-- The C compiler identification is MSVC 17.0.60610.1
-- The CXX compiler identification is MSVC 17.0.60610.1
-- Check for working C compiler using: Visual Studio 11
-- Check for working C compiler using: Visual Studio 11 -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler using: Visual Studio 11
-- Check for working CXX compiler using: Visual Studio 11 -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- RESULT C:/seqan-contrib-D20130710-x86/vs11/include
-- RESULT2 C:/seqan-contrib-D20130710-x86/vs11/include
-- RESULT3 C:/seqan-contrib-D20130710-x86/vs11/include
-- EXISTS C:/seqan-contrib-D20130710-x86/vs11/include/zlib.h
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Temp/example-build

C:\Temp\example-build>cmake --version
cmake version 2.8.12.1

C:\Temp\example-build>cmake ..\example -G "Visual Studio 11"
-- The C compiler identification is MSVC 17.0.60610.1
-- The CXX compiler identification is MSVC 17.0.60610.1
-- Check for working C compiler using: Visual Studio 11
-- Check for working C compiler using: Visual Studio 11 -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler using: Visual Studio 11
-- Check for working CXX compiler using: Visual Studio 11 -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- RESULT RESULT-NOTFOUND
-- RESULT2 RESULT2-NOTFOUND
-- RESULT3 C:/seqan-contrib-D20130710-x86/vs11/include
-- EXISTS C:/seqan-contrib-D20130710-x86/vs11/include/zlib.h
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Temp/example-build

==> CMakeLists.txt <==

cmake_minimum_required (VERSION 2.8)
set (CMAKE_MODULE_PATH "C:/seqan-trunk/util/cmake" ${CMAKE_MODULE_PATH})
set (CMAKE_FIND_ROOT_PATH "C:/seqan-contrib-D20130710-x86/vs11")

find_path (RESULT zlib.h PATH_SUFFIXES include)
message (STATUS "RESULT ${RESULT}")

find_path (RESULT2 zlib.h "C:/seqan-contrib-D20130710-x86/vs11" PATH_SUFFIXES include)
message (STATUS "RESULT2 ${RESULT2}")

find_path (RESULT3 zlib.h "C:/seqan-contrib-D20130710-x86/vs11/include")
message (STATUS "RESULT3 ${RESULT3}")

if (EXISTS "C:/seqan-contrib-D20130710-x86/vs11/include/zlib.h")
  message (STATUS "EXISTS C:/seqan-contrib-D20130710-x86/vs11/include/zlib.h")
else ()
  message (STATUS "DOES NOT EXIST C:/seqan-contrib-D20130710-x86/vs11/include/zlib.h")
endif ()
TagsNo tags attached.
Attached Files

 Relationships
has duplicate 0014619closed Windows: Regression affecting CMAKE_FIND_ROOT_PATH interaction with FIND_* commands, introduced since 2.8.11 

  Notes
(0034520)
Brad King (manager)
2013-11-22 10:09

 The find_path command has both a simple and a full signature:

 http://www.cmake.org/cmake/help/v2.8.12/cmake.html#command:find_path [^]

Your RESULT3 example works because you are using the simple signature where the third and later arguments are paths to search.

Your RESULT2 example fails because you are using the PATH_SUFFIXES option which enables the full signature. The full signature treats all arguments after the result variable and prior to any keyword arguments as names to consider rather than paths to search If I change the RESULT2 example to the full signature:

 find_path (RESULT2 NAMES zlib.h PATHS "C:/seqan-contrib-D20130710-x86/vs11" PATH_SUFFIXES include)

then it works. Without this change you provide no paths and depend on the builtin search paths to work.

Your RESULT example provides no paths and depends on the builtin search paths to work.

Now let's look at the system search paths.
CMAKE_FIND_ROOT_PATH is not a list of installation prefixes to search.
It is a list of paths to prefix to *other* search paths that would otherwise be searched directly.
This is for use when cross-compiling to help locate files inside target-platform SDKs.

The reason setting CMAKE_FIND_ROOT_PATH appeared to work in 2.8.11 and earlier but not in 2.8.12 is because prior to the bug fix for issue 0010994:

 http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=f9eee7f1 [^]

the CMAKE_SYSTEM_PREFIX_PATH contained "/" on Windows. When the CMAKE_FIND_ROOT_PATH is prefixed to "/" the result appears to search all the prefixes in CMAKE_FIND_ROOT_PATH, but only by accident.

In the example use case you should set CMAKE_PREFIX_PATH instead:

 http://www.cmake.org/cmake/help/v2.8.12/cmake.html#variable:CMAKE_PREFIX_PATH [^]

If I set that then all three examples (RESULT, RESULT2, RESULT3) work.
(0034521)
Brad King (manager)
2013-11-22 10:10

 For further help please inquire on the mailing list:

 http://www.cmake.org/cgi-bin/mailman/listinfo/cmake [^]
(0036049)
Robert Maynard (manager)
2014-06-02 08:37

 Closing resolved issues that have not been updated in more than 4 months.

 Issue History
Date Modified Username Field Change
2013-11-22 05:00 holtgrewe New Issue
2013-11-22 10:09 Brad King Note Added: 0034520
2013-11-22 10:10 Brad King Note Added: 0034521
2013-11-22 10:10 Brad King Status new => resolved
2013-11-22 10:10 Brad King Resolution open => no change required
2013-12-03 08:49 Brad King Relationship added has duplicate 0014619
2014-06-02 08:37 Robert Maynard Note Added: 0036049
2014-06-02 08:37 Robert Maynard Status resolved => closed

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