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Add CMAKE_SYSROOT variable to set --sysroot when cross compiling. 

As CMAKE_ROOT_FIND_PATH can be a list, a new CMAKE_SYSROOT is
introduced, which is never a list.

The contents of this variable is passed to supporting compilers
as --sysroot. It is also accounted for when processing implicit
link directories reported by the compiler, and when generating
RPATH information.
This commit is contained in:
Stephen Kelly 2013-04-13 14:46:57 +02:00 committed by Brad King
parent 5096967ecd
commit 7cd65c97fa
8 changed files with 78 additions and 9 deletions
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11
Help/command/FIND_XXX_ROOT.txt
View File

@ -1,10 +1,17 @@
The CMake variable CMAKE_FIND_ROOT_PATH specifies one or more
directories to be prepended to all other search directories. This
effectively "re-roots" the entire search under given locations. By
default it is empty. It is especially useful when cross-compiling to
default it is empty.
The :variable:`CMAKE_SYSROOT` variable can also be used to specify exactly one
directory to use as a prefix. Setting :variable:`CMAKE_SYSROOT` also has other
effects. See the documentation for that variable for more.
These variables are especially useful when cross-compiling to
point to the root directory of the target environment and CMake will
search there too. By default at first the directories listed in
CMAKE_FIND_ROOT_PATH and then the non-rooted directories will be
CMAKE_FIND_ROOT_PATH are searched, then the :variable:`CMAKE_SYSROOT` directory is
searched, and then the non-rooted directories will be
searched. The default behavior can be adjusted by setting
|CMAKE_FIND_ROOT_PATH_MODE_XXX|. This behavior can be manually
overridden on a per-call basis. By using CMAKE_FIND_ROOT_PATH_BOTH

1
Help/manual/cmake-variables.7.rst
View File

@ -91,6 +91,7 @@ Variables that Change Behavior
/variable/CMAKE_DISABLE_FIND_PACKAGE_PackageName
/variable/CMAKE_ERROR_DEPRECATED
/variable/CMAKE_ERROR_ON_ABSOLUTE_INSTALL_DESTINATION
/variable/CMAKE_SYSROOT
/variable/CMAKE_FIND_LIBRARY_PREFIXES
/variable/CMAKE_FIND_LIBRARY_SUFFIXES
/variable/CMAKE_FIND_PACKAGE_WARN_NO_MODULE

12
Help/variable/CMAKE_SYSROOT.rst Normal file
View File

@ -0,0 +1,12 @@
CMAKE_SYSROOT
-------------
Path to pass to the compiler in the ``--sysroot`` flag.
The ``CMAKE_SYSROOT`` content is passed to the compiler in the ``--sysroot``
flag, if supported. The path is also stripped from the RPATH/RUNPATH if
necessary on installation. The ``CMAKE_SYSROOT`` is also used to prefix
paths searched by the ``find_*`` commands.
This variable may only be set in a toolchain file specified by
the ``CMAKE_TOOLCHAIN_FILE`` variable.

1
Modules/Compiler/GNU.cmake
View File

@ -30,6 +30,7 @@ macro(__compiler_gnu lang)
endif()
set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
set(CMAKE_${lang}_COMPILE_OPTIONS_SYSROOT "--sysroot=")
# Older versions of gcc (< 4.5) contain a bug causing them to report a missing
# header file as a warning if depfiles are enabled, causing check_header_file

20
Source/cmComputeLinkInformation.cxx
View File

@ -1901,6 +1901,8 @@ void cmComputeLinkInformation::GetRPath(std::vector<std::string>& runtimeDirs,
}
if(use_build_rpath || use_link_rpath)
{
std::string rootPath = this->Makefile->GetSafeDefinition("CMAKE_SYSROOT");
cmSystemTools::ConvertToUnixSlashes(rootPath);
std::vector<std::string> const& rdirs = this->GetRuntimeSearchPath();
for(std::vector<std::string>::const_iterator ri = rdirs.begin();
ri != rdirs.end(); ++ri)
@ -1909,9 +1911,14 @@ void cmComputeLinkInformation::GetRPath(std::vector<std::string>& runtimeDirs,
// support or if using the link path as an rpath.
if(use_build_rpath)
{
if(emitted.insert(*ri).second)
std::string d = *ri;
if (!rootPath.empty() && d.find(rootPath) == 0)
{
runtimeDirs.push_back(*ri);
d = d.substr(rootPath.size());
}
if(emitted.insert(d).second)
{
runtimeDirs.push_back(d);
}
}
else if(use_link_rpath)
@ -1924,9 +1931,14 @@ void cmComputeLinkInformation::GetRPath(std::vector<std::string>& runtimeDirs,
!cmSystemTools::IsSubDirectory(ri->c_str(), topSourceDir) &&
!cmSystemTools::IsSubDirectory(ri->c_str(), topBinaryDir))
{
if(emitted.insert(*ri).second)
std::string d = *ri;
if (!rootPath.empty() && d.find(rootPath) == 0)
{
runtimeDirs.push_back(*ri);
d = d.substr(rootPath.size());
}
if(emitted.insert(d).second)
{
runtimeDirs.push_back(d);
}
}
}

7
Source/cmCoreTryCompile.cxx
View File

@ -433,6 +433,13 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv)
flag += tcDef;
cmakeFlags.push_back(flag);
}
if (const char *rootDef
= this->Makefile->GetDefinition("CMAKE_SYSROOT"))
{
std::string flag="-DCMAKE_SYSROOT=";
flag += rootDef;
cmakeFlags.push_back(flag);
}
if(this->Makefile->GetDefinition("CMAKE_POSITION_INDEPENDENT_CODE")!=0)
{
fprintf(fout, "set(CMAKE_POSITION_INDEPENDENT_CODE \"ON\")\n");

15
Source/cmFindCommon.cxx
View File

@ -138,16 +138,27 @@ void cmFindCommon::RerootPaths(std::vector<std::string>& paths)
{
return;
}
const char* sysroot =
this->Makefile->GetDefinition("CMAKE_SYSROOT");
const char* rootPath =
this->Makefile->GetDefinition("CMAKE_FIND_ROOT_PATH");
if((rootPath == 0) || (strlen(rootPath) == 0))
const bool noSysroot = !sysroot || !*sysroot;
const bool noRootPath = !rootPath || !*rootPath;
if(noSysroot && noRootPath)
{
return;
}
// Construct the list of path roots with no trailing slashes.
std::vector<std::string> roots;
cmSystemTools::ExpandListArgument(rootPath, roots);
if (rootPath)
{
cmSystemTools::ExpandListArgument(rootPath, roots);
}
if (sysroot)
{
roots.push_back(sysroot);
}
for(std::vector<std::string>::iterator ri = roots.begin();
ri != roots.end(); ++ri)
{

20
Source/cmLocalGenerator.cxx
View File

@ -1047,6 +1047,8 @@ cmLocalGenerator::ExpandRuleVariable(std::string const& variable,
const char* compilerOptionTarget = 0;
const char* compilerExternalToolchain = 0;
const char* compilerOptionExternalToolchain = 0;
const char* compilerSysroot = 0;
const char* compilerOptionSysroot = 0;
if(actualReplace == "CMAKE_${LANG}_COMPILER")
{
std::string arg1 = actualReplace + "_ARG1";
@ -1067,6 +1069,12 @@ cmLocalGenerator::ExpandRuleVariable(std::string const& variable,
= this->Makefile->GetDefinition(
(std::string("CMAKE_") + lang +
"_COMPILE_OPTIONS_EXTERNAL_TOOLCHAIN").c_str());
compilerSysroot
= this->Makefile->GetDefinition("CMAKE_SYSROOT");
compilerOptionSysroot
= this->Makefile->GetDefinition(
(std::string("CMAKE_") + lang +
"_COMPILE_OPTIONS_SYSROOT").c_str());
}
if(actualReplace.find("${LANG}") != actualReplace.npos)
{
@ -1099,6 +1107,12 @@ cmLocalGenerator::ExpandRuleVariable(std::string const& variable,
ret += compilerOptionExternalToolchain;
ret += this->EscapeForShell(compilerExternalToolchain, true);
}
if (compilerSysroot && compilerOptionSysroot)
{
ret += " ";
ret += compilerOptionSysroot;
ret += this->EscapeForShell(compilerSysroot, true);
}
return ret;
}
return replace;
@ -1493,6 +1507,8 @@ void cmLocalGenerator::GetIncludeDirectories(std::vector<std::string>& dirs,
return;
}
std::string rootPath = this->Makefile->GetSafeDefinition("CMAKE_SYSROOT");
std::vector<std::string> implicitDirs;
// Load implicit include directories for this language.
std::string impDirVar = "CMAKE_";
@ -1505,7 +1521,9 @@ void cmLocalGenerator::GetIncludeDirectories(std::vector<std::string>& dirs,
for(std::vector<std::string>::const_iterator i = impDirVec.begin();
i != impDirVec.end(); ++i)
{
emitted.insert(*i);
std::string d = rootPath + *i;
cmSystemTools::ConvertToUnixSlashes(d);
emitted.insert(d);
if (!stripImplicitInclDirs)
{
implicitDirs.push_back(*i);