Now, if an imported target depends on a library which must come
from some other export set, cmake generates a check which errors
out if that target does not exist. I guess instead of completely
erroring out it would be better to only make the find_package() fail.
Alex
If a target is exported, and a library it depends on is not part
of the same export set, before this patch cmake errored out.
With this patch, it now checks whether the missing target
is exported somewhere else exactly once, and accepts in this
case (because then it can determine the namespace for the
missing target and use this).
Alex
If a config-file sets <package>_FOUND to FALSE, it can now give a reason
using the variable <package>_NOT_FOUND_MESSAGE, which is used by cmFindPackage
and FPHSA.
Alex
The remainder of this method depends on the target existing (otherwise
the includes container would be empty), so make the code a little more
readable.
Prevent constructs like:
... INCLUDE_DIRECTORIES "$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>"
Indirect self-references (cycles) are also prevented here, but
indirect generator expression references of any kind are not
possible yet anyway.
There are two overloads, so that it can use the operational
target when a target property is being evaluated, and a target
can alternatively be specified by name.
At this point, the generators don't chain. That comes later.
Generator expressions for comparing strings, evaluating
strings as booleans, and for creating literal right-angle-brackets
and commas are added. Those may be needed in some cases
where they appear in literals.
When more than one value is given to the NAMES option this command by
default will consider one name at a time and search every directory for
it. Add a NAMES_PER_DIR option to tell this command to consider one
directory at a time and search for all names in it.
In cmFindLibraryCommand::FindFrameworkLibrary drop use of the old
SystemTools::FindDirectory method. Replace it with a direct
implementation of the only code path we used.
Teach cmFindLibraryHelper to support multiple possible names and iterate
over all of them in each CheckDirectory call. For now we still only
ever configure one name.
This enables changing the name and output folder of the debug symbol
files produced by MS compilers.
Inspired-by: Thomas Bernard <thomas.bernard@ipetronik.com>
e83cc94 Use the cmGeneratorTarget for the include directories API.
9d8e59d Merge branch 'use-generator-target' into AutomocUseTargetProperties
ea12871 Automoc: also the makefile-COMPILE_DEFINITIONS
894e91a Automoc: do not use DEFINITIONS, but only COMPILE_DEFINITIONS
825d1ab Automoc: fix#13493, use target properties for include dirs
879fd35 Revert "Move GenerateTargetManifest to cmGeneratorTarget."
6674583 Fix compiler warning with initialization order.
5285458 Add convenience for getting a cmGeneratorTarget to use.
c31f3d9 Add a wrapper for accessing config-specific compile-definitions.
d1446ca Append the COMPILE_DEFINITIONS from the Makefile to all targets.
290e92a Move GetIncludeDirectories to cmGeneratorTarget.
f9146f6 Port cmLocalGenerator::GetTargetFlags to cmGeneratorTarget.
9facfd1 Move GetCreateRuleVariable to cmGeneratorTarget.
78bfee3 Make cmLocalGenerator::AddArchitectureFlags take a cmGeneratorTarget.
4f5384e Move GetLinkInformation to cmGeneratorTarget
987e12e Move GenerateTargetManifest to cmGeneratorTarget.
14bf778 Store cmGeneratorTargets with the makefile.
f428ca2 Add more forwarding API to cmGeneratorTarget.
df92864 OS X: Ignore MACOSX_DEPLOYMENT_TARGET during Xcode compiler id
e7e613e OS X: Teach deployment target sanity check about SDK names
43b7479 OS X: Further improve default CMAKE_OSX_SYSROOT selection
2690738 OS X: If CMAKE_OSX_SYSROOT is already set do not compute default
7995722 OS X: Simplify selection of CMAKE_OSX_ARCHITECTURES
1786b12 OS X: Allow CMAKE_OSX_SYSROOT to be a logical SDK name
242f673 Tests/Assembler: Use CMAKE_OSX_SYSROOT to generate .s file
a1c032b bootstrap: Suppress CMAKE_OSX_SYSROOT if CFLAGS have -isysroot
230ea21 OS X: Improve default CMAKE_OSX_SYSROOT selection
a0a0877 OS X: Always generate -isysroot if any SDK is in use
33a60e6 Xcode: Remove unused code reading CMAKE_OSX_SYSROOT_DEFAULT
The QAbstractItemModel::reset() method is deprecated in Qt 5, and
therefore not part of the API by default (on non-Windows).
The replacement for it is beginResetModel/endResetModel which are
available from Qt 4.6 onwards.
The minimum version of Qt required is currently 4.4, so enable the
deprecated API instead of changing that.
Drop the last use of CMAKE_OSX_SYSROOT_DEFAULT. Replace internal
platform variable CMAKE_${lang}_HAS_ISYSROOT with a more general
CMAKE_${lang}_SYSROOT_FLAG variable. If the -isysroot flag exists and
CMAKE_OSX_SYSROOT points to an SDK (not "/") then always add it to
compiler command lines. This is already done in the Xcode IDE.
Like the special case for commas, this ensures that the colon only has
special meaning as the delimiter between the identifier and the
parameters of a particular expression, but constructs such as
INCLUDE_DIRECTORIES "$<1:C:\foo>"
are legal.
This reverts commit 987e12e2f9.
GenerateTargetManifest is called by the global generator before it
creates the generator targets, so we can't move it to cmGeneratorTarget
yet.
Make the EXPECTED_HASH option take only a single value instead of two to
avoid handling sub-keyword arguments. This is also consistent with
URL_HASH in ExternalProject.
This way we don't need to check the definitions from the Makefile when
generating later, and can more easily add generator expressions.
Duplication is not a problem as the definitions are de-duplicated before
generating.
Removing the Process() API and removing the parameters from the
constructor will allow cmGeneratorExpressions to be cached and evaluated
with multiple configs for example, such as when evaluating target
properties. This requires the creation of a new compiled representation
of cmGeneratorExpression. The cmListFileBacktrace remains in the
constructor so that we can record where a particular generator
expression appeared in the CMakeLists file.
The expressions may be parsed and then cached and evaluated multiple
times. They are evaluated lazily so that literals such as ',' can be
treated as universal parameter separators, and can be processed from
results without appearing literally, and without interfering with the
parsing/evaluation of the entire expression.
25a4f56 Build with Qt5 if it is found.
717f31a Compile with both Qt4 and Qt5.
066e858 Replace two include_directories with a setting.
430ba9f Use add_subdirectory instead of the obsolete subdirs.
32a5725 Remove an if which is always true.
0b6625c Move variable setting down to where it relates to.
8ab312b Use CMake platform variables instead of Qt ones.
bd728f6 Add a return-after-error if an old Qt is found.
Some servers require a User-Agent string. The curl command-line tool
just sends "curl/$curlver", so do the same.
Suggested-by: Fredrik Ehnbom <fehnbom@nvidia.com>
Use the registry entries that vsvars32.bat uses to detect the location of
MSBuild.exe in the framework directory. Invoke MSBuild with the option
/p:VisualStudioVersion=$version
so it knows from which VS version to load the system build rules. Teach
cmGlobalVisualStudio11Generator to set its ExpressEdition member using the
registry.
Add WDExpress to the list of registry search locations. Add VS 11 to
the list of VS versions and corresponding generator names. Fix the
search logic to use the most recent version found under any registry
entry.
Inspired-by: Peter Kümmel <syntheticpp@gmx.net>
The logic added in commit e1c89f08 (file(DOWNLOAD): Add options for SSL,
2012-08-21) did not actually provide the documented behavior. Simplify
the implementation to read the variable values first and then replace
them with the explicit argument values if encountered. Always set the
curl option CURLOPT_SSL_VERIFYPEER to either on or off explicitly
instead of depending on the curl default behavior.
TLS has superseded SSL so rename the recently added file(DOWNLOAD) and
ExternalProject options using the newer terminology. Drop "CURLOPT"
from names because curl is an implementation detail.
Extend the number of components tested by
if(... VERSION_LESS ...)
if(... VERSION_EQUAL ...)
if(... VERSION_GREATER ...)
from 4 to 8. The latter is a more extreme maximum.
Add the ability to request that downloads disable or enable Certificate
Authority checking with https ssl downloads. When the option to verify
the servers CA is disabled, one may verify download contents with SHA
hashes.
d0c863f docbook: Fix Sun CC warning on ptr_fun(isalnum)
4e62784 docbook: Fix formatter naming convention to avoid shadow
9ad85dbb docbook: Remove redundant docs that cause invalid DocBook
9468b41 docbook: Add CMake.DocBook test to validate xml (#13508)
3a9e373 docbook: Add support for <abstract> at section level 1
67e7d49 docbook: Cleanup formatter and generated DocBook
55146ed docbook: Fix the DocBook section output
dbfe335 docbook: Factor out code to write valid DocBook IDs
cffa899 docbook: Remove table of contents
ac25bc0 Utilities/xml: Add docbook-4.5 DTD (#13508)
2b2e86f Utilities/xml: Add .gitattributes to disable whitespace checks
57234dd cmCTestSVN: Load and process information from externals
3776690 cmCTestSVN: Add a LoadExternal() function and an ExternalParser class
41f0f83 cmCTestSVN: Use the SVNInfo structure
fb6d513 cmCTestSVN: Create the SVNInfo for the root repository
8d1e102 cmCTestSVN: Add the Repositories list and the RootInfo pointer
2f204bc cmCTestSVN: Extend Revision struct with SVN repo information
aa1076f cmCTestSVN: Add the new SVNInfo structure
The Sun compiler complains:
cmDocumentationFormatterDocbook.cxx", line 230: Warning (Anachronism),
badargtype2w: Formal argument x of type int(*)(int) in call to
std::ptr_fun<int, int>(int(*)(int)) is being passed
extern "C" int(*)(int).
Add an intermediate C++ function to forward to the C function.
Some compilers complain:
cmDocumentationFormatterDocbook.cxx: In member function virtual void cmDocumentationFormatterDocbook::PrintHeader(const char*, const char*, std::ostream&):
cmDocumentationFormatterDocbook.cxx:197:73: warning: declaration of docname shadows a member of 'this' [-Wshadow]
Fix the name of the member variable.
If a section has subsections (ie. subelemens with a title), all elements
before the first title are written inside an <abstract>. Also wrap
<programlisting> in <para>, to allow preformatted output in abstracts.
The DocBook formatter used to generate something like:
<para id="section"><sect2><title>Title</title></sect2>Some Text</para>
Which was completely wrong. In DocBook, a section should look like this:
<sect2 id="section"><title>Title</title><para>Some Text</para></sect2>
Attributes in XML may contain alphanumeric characters, underscores,
colons and dots. When DocBook is chunked, the dot is often used as a
path separator. To generate a valid ID, we take the title of the
section, transform all non-alphanumeric characters to underscores and
then add a prefix separated with dots. We also add the document name as
a prefix, in order to 'xinclude' eg. cmake.docbook and ctest.docbook in
the same document. IDs are written in multiple places, so the code is
factored to a function.
When DocBook is transformed (eg. to PDF, HTML, ...), a TOC is generated
from the document's layout. The TOC-like list that the docbook
formatter used to generate was both redundant and invalid.
Sometimes it wasn't returning an error and one could continue
with the generate generate as if no errors occurred, and even
with an incomplete configure step.
This call 'svn status' and parse the result to get the list of externals
repositories. The external repositories found are added to the
Repositories list.
- Suppress the URL, Root, Base fields from the cmCTestSVN class
- Update the code to use RootInfo instead
- LoadInfo(), GuessBase(), and a new LoadRevision() functions work on a given SVNInfo
- Use the implementation from the base class for LocalPath(), correct path is built by SVNInfo::BuildLocalPath() instead
The Repository list will contain the SVNInfo of all the repositories
(root and external ones). The RootInfo pointer will point to the
SVNInfo structure of the root repository.
The POSITION_INDEPENDENT_CODE property documentation states that its
default value depends on whether SHARED or MODULE is given to the
add_library call. Since these are options to the add_library command we
should document on the command how they affect the property.
While at it, add a missing space to the POSITION_INDEPENDENT_CODE
property documentation.
32b7c72 Merge branch 'cmake-platform-info-version' into msvc-compiler-info
f3ddfef Modernize MSVC compiler information files
485a940 VS: Simplify MSVC version reporting
32db033 VS: Remove support for "free" version 2003 tools
e5fee8a Store ABI detection results in compiler information files
3df81b4 Move CMAKE_<LANG>_COMPILER_WORKS to compiler information files
7195aca Make platform information files specific to the CMake version
Teach Windows-cl.cmake to use CMAKE_(C|CXX)_COMPILER_VERSION to set the
"MSVC##" and MSVC_VERSION variables. It no longer needs the IDE generator
to dictate the version or to detect the version by running the
command-line tool for NMake and Ninja generators. Drop configuration of
CMakeCPlatform.cmake and CMakeCXXPlatform.cmake from Windows-cl.cmake.in
because all the results it saved are now cheap to compute every time.
Until now it was only rerun if the compile definitions changed, but
of course it also has to rerun if the include dirs or moc options
change. Strange that I didn't notice this before...
Alex
403ead6 Document CMAKE_<LANG>_COMPILER_(ID|VERSION) values
8be51f6 Test variables CMAKE_(C|CXX|Fortran)_COMPILER(|_ID|_VERSION)
ec22a9b Cleanly enable a language in multiple subdirectories
66cb335 VS: Detect the compiler id and tool location
89595d6 VS10: Define CMAKE_VS_PLATFORM_TOOLSET variable
965a69d Xcode: Detect the compiler id and tool location
9a9e1ee CMakeDetermineCompilerId: Prepare to detect IDE compiler id
b8b5c83 Re-order C/C++/Fortran compiler determination logic
709fa59 Ninja: remove GetTargetPDB because it is used only once
4bb4787 Ninja:split out setting of msvc TARGET_PDB
59cbc28 Ninja: prepare msvc pdb cleanup
f0a1065 Rename files from main.cpp to more meaningful names.
ca7fb14 Fix the test setting COMPILE_DEFINITIONS target property
733deb6 Fix CompileDefinitions test on Visual Studio.
3dae652 Don't duplicate -D defines sent to the compiler.
ee949d8 Remove duplicate 'of' from docs.
ecc1acb Remove incorrect doc string for link type enum
805f5e5 Fix some typos in the docs.
389d423 Add missing whitespace to docs.
8aed02a -fix Java dependency scanning, broken in previous commit
7ae4479 -fix line length
87fe428fix#13474: also rescan dependencies if the depender does not exist
At the top of a build tree we configure inside the CMakeFiles directory
files such as "CMakeSystem.cmake" and "CMake<lang>Compiler.cmake" to
save information detected about the system and compilers in use. The
method of detection and the exact results store varies across CMake
versions as things improve. This leads to problems when loading files
configured by a different version of CMake. Previously we ignored such
existing files only if the major.minor part of the CMake version
component changed, and depended on the CMakeCache.txt to tell us the
last version of CMake that wrote the files. This led to problems if the
user deletes the CMakeCache.txt or we add required information to the
files in a patch-level release of CMake (still a "feature point" release
by modern CMake versioning convention).
Ensure that we always have version-consistent platform information files
by storing them in a subdirectory named with the CMake version. Every
version of CMake will do its own system and compiler identification
checks even when a build tree has already been configured by another
version of CMake. Stored results will not clobber those from other
versions of CMake which may be run again on the same tree in the future.
Loaded results will match what the system and language modules expect.
Rename the undocumented variable CMAKE_PLATFORM_ROOT_BIN to
CMAKE_PLATFORM_INFO_DIR to clarify its purpose. The new variable points
at the version-specific directory while the old variable did not.
Several more recent Visual Studio Express editions are now available and
they support debug builds. Simplify our VS platform files by removing
support for these old tools. If anyone still uses them we can restore
support with a more modern way to test for them.
When a language is not enabled at the top level of a project but is
enabled in multiple disjoint subdirectories we should re-use the
CMake<lang>Compiler.cmake file from the first directory. Load the file
whenever it exists and is not left from a different version of CMake.
Run cmparseMSBuildXML.py on cl.xml, lib.xml, and link.xml to generate
our flag tables:
python cmparseMSBuildXML.py -x ".../MSBuild/Microsoft.Cpp/v4.0/V110/1033/cl.xml" > cmVS11CLFlagTable.h
python cmparseMSBuildXML.py -x ".../MSBuild/Microsoft.Cpp/v4.0/V110/1033/lib.xml" > cmVS11LibFlagTable.h
python cmparseMSBuildXML.py -x ".../MSBuild/Microsoft.Cpp/v4.0/V110/1033/link.xml" > cmVS11LinkFlagTable.h
Fix up the declaration names at the top of each file. Finally, teach
cmVisualStudio10TargetGenerator to select the version of the table
matching the version of VS.
In VS 11 the WindowsAppContainer element enabled by the
VS_WINRT_EXTENSIONS property activates precompiled header support
automatically if no PrecompiledHeader setting is specified. For VS 10 and
11 set PrecompiledHeader to "NotUsing" explicitly by default unless
overridden by a project-specified flag.
Suggested-by: Eugene Golushkov <eugene_gff@ukr.net>
Since commit 9e01aefd (VS: Add support for WinRT project properties,
2012-02-03) CMake generates for VS 11 projects the 'Immersive' element
for the VS_WINRT_EXTENSIONS target property. That was based on the VS
11 preview version. The final version renamed the element to
'WindowsAppContainer', so generate that instead.
Suggested-by: Eugene Golushkov <eugene_gff@ukr.net>
Otherwise, CTEST_USE_LAUNCHERS can be set to true in a driving ctest
script, and everything looks like it would work and reports 0 build errors,
but actually there can be any amount of errors and they are just not reported.
By adding this check cmake now errors out if CTEST_USE_LAUNCHERS is enabled, but
the RULE properties are not set, which would lead to a not-working ctest run.
Alex
There is no need to do so. Be consistent with include directories and
ensure uniqueness.
This requires changing the API of the cmLocalGenerator::AppendDefines
method, and changing the generators to match.
The test unfortunately can't test for uniqueness, but it at least verifies
that nothing gets lost.
a3815e6 -fix line length
9110d0e Eclipse on OSX: improve handling of framework include dirs (#13367)
d97b385 Eclipse on OSX: fix handling of framework include dirs (#13464)
If the depender (e.g. foo.o) does not exist, also rescan dependencies if
one of the dependees (e.g. foo.cxx) is older than the already existing
depend.internal file, since this means it can be out of date.
Alex
directory where the project file is located (${CMAKE_BINARY_DIR}), which can
happen e.g. for EXECUTABLE_OUTPUT_PATH and related variables.
Now, it seems this code never worked.
If EXECUTABLE_OUTPUT_PATH was set to point into a subdir of CMAKE_BINARY_DIR,
the code did nothing.
If it pointed directly at CMAKE_BINARY_DIR or some other location, it created
a linked resource. I tested this with Eclipse Europa (3.3) and Juno (4.2), and in this
case both versions of Eclipse complained that this is a bad location for a linked resource.
Alex
It seems that if cmake finds something like the following:
/System/Library/Frameworks/GLUT.framework/Headers
Eclipse doesn't like that and wants to have
/System/Library/Frameworks
instead
Alex
...comparison operator in the IF command. In the event of
a tie, we intentionally return "true" so that dependent
build operations are guaranteed to occur until one file
is definitively newer than the other file.
A tie means we're not sure, so return true to be on the
safe side.
SORT, REVERSE, and REMOVE_DUPLICATES can only operate on exactly one argument.
Until now all other arguments were silently ignored. Give an error instead.
This expression evaluates to '1' or '0' to indicate whether the build
configuration for which the expression is evaluated matches tha named
configuration. In combination with the "$<0:...>" and "$<1:...>"
expressions this allows per-configuration content to be generated.
Add generator expressions that combine and use boolean test results:
$<0:...> = empty string (ignores "...")
$<1:...> = content of "..."
$<AND:?[,?]...> = '1' if all '?' are '1', else '0'
$<OR:?[,?]...> = '0' if all '?' are '0', else '1'
$<NOT:?> = '0' if '?' is '1', else '1'
These will be useful to evaluate (future) boolean query expressions and
condition content on the results. Include tests and documentation.
Since commit 77543bde (Convert CMake-language commands to lower case,
2012-08-13) the CMakeVersion.cmake file contains lower-case 'set'
commands. Teach CMakeVersion.bash to replace the lower-case name
instead of the old upper-case 'SET'.
Ancient versions of CMake required else(), endif(), and similar block
termination commands to have arguments matching the command starting the
block. This is no longer the preferred style.
Run the following shell code:
for c in else endif endforeach endfunction endmacro endwhile; do
echo 's/\b'"$c"'\(\s*\)(.\+)/'"$c"'\1()/'
done >convert.sed &&
git ls-files -z -- bootstrap '*.cmake' '*.cmake.in' '*CMakeLists.txt' |
egrep -z -v '^(Utilities/cm|Source/kwsys/)' |
egrep -z -v 'Tests/CMakeTests/While-Endwhile-' |
xargs -0 sed -i -f convert.sed &&
rm convert.sed
Multiple versions of Xcode may be installed in different locations.
Run "xcode-select --print-path" to detect the active Xcode location
and parse its Contents/version.plist file. Note that the Xcode.app
directory name may vary in developer versions.
In cmGlobalXCodeGenerator::Generate we generate a .xcodeproj for each
directory in the tree containing a project() command. First we
iteratively use SetGenerationRoot to add "ALL_BUILD" and other targets
to each project. This leaves "CurrentProject" set to the last project
when we invoke cmGlobalGenerator::Generate, which is not the same as the
top-level project if any subdirectories invoke the project() command.
When cmGlobalGenerator::Generate reaches CreateGeneratorTargets it
constructs cmGeneratorTarget and calls ComputeTargetObjects exactly once
per target. In this context the value of CurrentProject is undefined so
we cannot pass it to GetObjectsNormalDirectory. Use "$(PROJECT_NAME)"
instead so it will adapt automatically to each project.
Also teach Tests/ObjectLibrary to cover this case.
1fc8df9 Add missing this->.
7a3ecf5 Fix memory leak in Makefile generator.
9f7dc83 Ninja: also bootstrap ninja files
5d365b2 Ninja: enable ninja support everywhere
d569f3e Ninja: void function can't return a value
52160bf Ninja: enable ninja on Mac so all Mac CDash-builds are tested, cleanup later
56aeac6 Ninja: fixes for bcc
7a6bc9e Ninja: remove 'this' from member initializer list
44ba4cf Ninja: remove warnings
7751966 Ninja: remove 'friend' in ninja code
c3988ee Re-factor OS X content generator start up.
f8e0a51 Re-factor framework directory computation.
f36c7b0 Re-factor Mac OS X content directory computation.
5d885db Re-factor bundle content copying rules generation.
3b2a01e Ninja: Use same echo message as makefiles.
7bb56c5 Re-factor CFBundle generation.
...
b47cffa CPack: Use bin subdir when looking for dpkg and rpmbuild
a8c659c Find dpkg and rpmbuild in usual Fink and MacPort paths
848f220 Do not run cpack at CMake time it is not available.
9e30289 Ninja: Cannot pass a reference to an anonymous object.
0a3d6a1 Ninja: make debug symbol suffix configurable by CMAKE_DEBUG_SYMBOL_SUFFIX
75bbffb Ninja: make TARGET_PDB a real .gdb file name
e5a27a4 Ninja: line length
ae8124a Ninja: also mingw needs TARGET_PDB
74d1c88 Ninja: cmcldeps needs absolute paths for RCs
1cdeef7 Ninja: readd quotes to src file path before patching it
84a18cb Ninja: also stop when .rc's .d file couldn't be generated
c864103 Ninja: path is already declared
6547f36 Ninja: more searching for windres
78588e0 Ninja: there could be null pointers
0c89c10 Ninja: search for windres with prefix
4654680 Ninja: windres is also used for cross-compiling
When a search path contains multiple "lib/" instances we previously
converted all or none. This fails for cases where only some of the
multiple instances must be converted. Teach AddArchitecturePaths to
generate all combinations that exist. Uncomment these cases in the
CMakeOnly.find_library test now that they work.
Simplify cmFindLibraryCommand::AddArchitecturePaths logic to avoid
recording a separate 'found' status and populating an entire
vector<string> just to throw it away.
Previously methods AddArchitecturePaths and AddLib64Paths were almost
identical. Replace the latter with a call to the former. Fix the
AddArchitecturePaths implementation to add trailing slashes to all
tested paths.
4bb94c9 Ninja: sysconf() is declared in unistd.h
bb36759 Ninja: enable response file support on Mac (length 262144)
3a2c8e8 Ninja: disable work around when linking with mingw
3856e66 Ninja: error on missing rspfile_content
8c1e35c Ninja: remove some unused default arguments
7f647cf Ninja: also write link libraries to rsp file
Since commit 7ced0732 (make default install component name configurable,
2012-05-13) the COMPONENT option has not worked in all cases. The
change restored use of the broken SetDefaultString previously removed by
commit 43cad3e4 (fix the default "Unspecified" component, 2008-03-26).
Remove SetDefaultString and use the default component name only when an
invocation does not specify a non-empty COMPONENT option value.
Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=680825
A common mistake is to write
macro(foo arg)
if(arg)
endif()
endmacro()
and expect if() to treat "arg" as a variable. The documentation of the
macro() command already states that arguments are not variables, but
users writing the if() command may not look at the macro() docs.
Add a note to the if() documentation.
The work around is only needed by older GCCs (only testet 4.4/4.7)
Ninja is very new so chances are high that there is also a new mingw.
Use slashes in link rsp file, because ar.exe can't handle \.