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-rw-r--r--Help/manual/cmake-developer.7.rst4
-rw-r--r--Help/prop_tgt/CXX_STANDARD.rst3
-rw-r--r--Help/prop_tgt/CXX_STANDARD_REQUIRED.rst3
-rw-r--r--Help/prop_tgt/C_STANDARD.rst3
-rw-r--r--Help/prop_tgt/C_STANDARD_REQUIRED.rst3
-rw-r--r--Source/cmGeneratorExpressionEvaluator.cxx11
-rw-r--r--Source/cmLocalGenerator.cxx9
-rw-r--r--Source/cmMakefile.cxx46
-rw-r--r--Tests/CompileFeatures/CMakeLists.txt36
-rw-r--r--Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake36
-rw-r--r--Tests/RunCMake/CompileFeatures/generate_feature_list.cmake14
11 files changed, 126 insertions, 42 deletions
diff --git a/Help/manual/cmake-developer.7.rst b/Help/manual/cmake-developer.7.rst
index 65b3a72..e18250c 100644
--- a/Help/manual/cmake-developer.7.rst
+++ b/Help/manual/cmake-developer.7.rst
@@ -80,7 +80,9 @@ When adding the first supported feature to a particular CompilerId, it is
necessary to list support for all features known to cmake (See
:variable:`CMAKE_C_COMPILE_FEATURES` and
:variable:`CMAKE_CXX_COMPILE_FEATURES` as appropriate), where available for
-the compiler.
+the compiler. Furthermore, set ``CMAKE_<LANG>_STANDARD_DEFAULT`` to the
+default language standard level the compiler uses, or to the empty string
+if the compiler has no notion of standard levels (such as ``MSVC``).
It is sensible to record the features for the most recent version of a
particular CompilerId first, and then work backwards. It is sensible to
diff --git a/Help/prop_tgt/CXX_STANDARD.rst b/Help/prop_tgt/CXX_STANDARD.rst
index 6329e34..65b30ec 100644
--- a/Help/prop_tgt/CXX_STANDARD.rst
+++ b/Help/prop_tgt/CXX_STANDARD.rst
@@ -5,7 +5,8 @@ The C++ standard whose features are requested to build this target.
This property specifies the C++ standard whose features are requested
to build this target. For some compilers, this results in adding a
-flag such as ``-std=gnu++11`` to the compile line.
+flag such as ``-std=gnu++11`` to the compile line. For compilers that
+have no notion of a standard level, such as MSVC, this has no effect.
Supported values are ``98``, ``11`` and ``14``.
diff --git a/Help/prop_tgt/CXX_STANDARD_REQUIRED.rst b/Help/prop_tgt/CXX_STANDARD_REQUIRED.rst
index ac103a4..4e24e5e 100644
--- a/Help/prop_tgt/CXX_STANDARD_REQUIRED.rst
+++ b/Help/prop_tgt/CXX_STANDARD_REQUIRED.rst
@@ -7,7 +7,8 @@ If this property is set to ``ON``, then the value of the
:prop_tgt:`CXX_STANDARD` target property is treated as a requirement. If this
property is ``OFF`` or unset, the :prop_tgt:`CXX_STANDARD` target property is
treated as optional and may "decay" to a previous standard if the requested is
-not available.
+not available. For compilers that have no notion of a standard level, such as
+MSVC, this has no effect.
See the :manual:`cmake-compile-features(7)` manual for information on
compile features.
diff --git a/Help/prop_tgt/C_STANDARD.rst b/Help/prop_tgt/C_STANDARD.rst
index 88ca926..3aa74af 100644
--- a/Help/prop_tgt/C_STANDARD.rst
+++ b/Help/prop_tgt/C_STANDARD.rst
@@ -5,7 +5,8 @@ The C standard whose features are requested to build this target.
This property specifies the C standard whose features are requested
to build this target. For some compilers, this results in adding a
-flag such as ``-std=gnu11`` to the compile line.
+flag such as ``-std=gnu11`` to the compile line. For compilers that
+have no notion of a standard level, such as MSVC, this has no effect.
Supported values are ``90``, ``99`` and ``11``.
diff --git a/Help/prop_tgt/C_STANDARD_REQUIRED.rst b/Help/prop_tgt/C_STANDARD_REQUIRED.rst
index a7304f4..743d568 100644
--- a/Help/prop_tgt/C_STANDARD_REQUIRED.rst
+++ b/Help/prop_tgt/C_STANDARD_REQUIRED.rst
@@ -7,7 +7,8 @@ If this property is set to ``ON``, then the value of the
:prop_tgt:`C_STANDARD` target property is treated as a requirement. If this
property is ``OFF`` or unset, the :prop_tgt:`C_STANDARD` target property is
treated as optional and may "decay" to a previous standard if the requested is
-not available.
+not available. For compilers that have no notion of a standard level, such as
+MSVC, this has no effect.
See the :manual:`cmake-compile-features(7)` manual for information on
compile features.
diff --git a/Source/cmGeneratorExpressionEvaluator.cxx b/Source/cmGeneratorExpressionEvaluator.cxx
index 5f246f9..6692a92 100644
--- a/Source/cmGeneratorExpressionEvaluator.cxx
+++ b/Source/cmGeneratorExpressionEvaluator.cxx
@@ -1370,6 +1370,8 @@ static const struct CompileFeaturesNode : public cmGeneratorExpressionNode
{
std::vector<std::string> const& langAvailable
= availableFeatures[lit->first];
+ const char* standardDefault = context->Makefile
+ ->GetDefinition("CMAKE_" + lit->first + "_STANDARD_DEFAULT");
for (std::vector<std::string>::const_iterator it = lit->second.begin();
it != lit->second.end(); ++it)
{
@@ -1378,6 +1380,12 @@ static const struct CompileFeaturesNode : public cmGeneratorExpressionNode
{
return "0";
}
+ if (standardDefault && !*standardDefault)
+ {
+ // This compiler has no notion of language standard levels.
+ // All features known for the language are always available.
+ continue;
+ }
if (!context->Makefile->HaveStandardAvailable(target,
lit->first, *it))
{
@@ -1386,8 +1394,7 @@ static const struct CompileFeaturesNode : public cmGeneratorExpressionNode
const char* l = target->GetProperty(lit->first + "_STANDARD");
if (!l)
{
- l = context->Makefile
- ->GetDefinition("CMAKE_" + lit->first + "_STANDARD_DEFAULT");
+ l = standardDefault;
}
assert(l);
context->MaxLanguageStandard[target][lit->first] = l;
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 834f705..af4c950 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -2207,6 +2207,13 @@ AddCompilerRequirementFlag(std::string &flags, cmTarget* target,
{
return;
}
+ const char* defaultStd
+ = this->Makefile->GetDefinition("CMAKE_" + lang + "_STANDARD_DEFAULT");
+ if (defaultStd && !*defaultStd)
+ {
+ // This compiler has no notion of language standard levels.
+ return;
+ }
std::string stdProp = lang + "_STANDARD";
const char *standardProp = target->GetProperty(stdProp);
if (!standardProp)
@@ -2269,8 +2276,6 @@ AddCompilerRequirementFlag(std::string &flags, cmTarget* target,
std::find(stds.begin(), stds.end(), standard);
assert(stdIt != stds.end());
- const char* defaultStd
- = this->Makefile->GetDefinition("CMAKE_" + lang + "_STANDARD_DEFAULT");
std::vector<std::string>::const_iterator defaultStdIt;
if (defaultStd)
{
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 87e62d7..ba914e1 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -5253,6 +5253,27 @@ bool cmMakefile::
HaveCStandardAvailable(cmTarget const* target,
const std::string& feature) const
{
+ const char* defaultCStandard =
+ this->GetDefinition("CMAKE_C_STANDARD_DEFAULT");
+ if (!defaultCStandard)
+ {
+ std::ostringstream e;
+ e << "CMAKE_C_STANDARD_DEFAULT is not set. COMPILE_FEATURES support "
+ "not fully configured for this compiler.";
+ this->IssueMessage(cmake::INTERNAL_ERROR, e.str());
+ // Return true so the caller does not try to lookup the default standard.
+ return true;
+ }
+ if (std::find_if(cmArrayBegin(C_STANDARDS), cmArrayEnd(C_STANDARDS),
+ cmStrCmp(defaultCStandard)) == cmArrayEnd(C_STANDARDS))
+ {
+ std::ostringstream e;
+ e << "The CMAKE_C_STANDARD_DEFAULT variable contains an "
+ "invalid value: \"" << defaultCStandard << "\".";
+ this->IssueMessage(cmake::INTERNAL_ERROR, e.str());
+ return false;
+ }
+
bool needC90 = false;
bool needC99 = false;
bool needC11 = false;
@@ -5262,7 +5283,7 @@ HaveCStandardAvailable(cmTarget const* target,
const char *existingCStandard = target->GetProperty("C_STANDARD");
if (!existingCStandard)
{
- existingCStandard = this->GetDefinition("CMAKE_C_STANDARD_DEFAULT");
+ existingCStandard = defaultCStandard;
}
if (std::find_if(cmArrayBegin(C_STANDARDS), cmArrayEnd(C_STANDARDS),
@@ -5331,6 +5352,27 @@ bool cmMakefile::IsLaterStandard(std::string const& lang,
bool cmMakefile::HaveCxxStandardAvailable(cmTarget const* target,
const std::string& feature) const
{
+ const char* defaultCxxStandard =
+ this->GetDefinition("CMAKE_CXX_STANDARD_DEFAULT");
+ if (!defaultCxxStandard)
+ {
+ std::ostringstream e;
+ e << "CMAKE_CXX_STANDARD_DEFAULT is not set. COMPILE_FEATURES support "
+ "not fully configured for this compiler.";
+ this->IssueMessage(cmake::INTERNAL_ERROR, e.str());
+ // Return true so the caller does not try to lookup the default standard.
+ return true;
+ }
+ if (std::find_if(cmArrayBegin(CXX_STANDARDS), cmArrayEnd(CXX_STANDARDS),
+ cmStrCmp(defaultCxxStandard)) == cmArrayEnd(CXX_STANDARDS))
+ {
+ std::ostringstream e;
+ e << "The CMAKE_CXX_STANDARD_DEFAULT variable contains an "
+ "invalid value: \"" << defaultCxxStandard << "\".";
+ this->IssueMessage(cmake::INTERNAL_ERROR, e.str());
+ return false;
+ }
+
bool needCxx98 = false;
bool needCxx11 = false;
bool needCxx14 = false;
@@ -5339,7 +5381,7 @@ bool cmMakefile::HaveCxxStandardAvailable(cmTarget const* target,
const char *existingCxxStandard = target->GetProperty("CXX_STANDARD");
if (!existingCxxStandard)
{
- existingCxxStandard = this->GetDefinition("CMAKE_CXX_STANDARD_DEFAULT");
+ existingCxxStandard = defaultCxxStandard;
}
if (std::find_if(cmArrayBegin(CXX_STANDARDS), cmArrayEnd(CXX_STANDARDS),
diff --git a/Tests/CompileFeatures/CMakeLists.txt b/Tests/CompileFeatures/CMakeLists.txt
index aacf4c1..9ef8049 100644
--- a/Tests/CompileFeatures/CMakeLists.txt
+++ b/Tests/CompileFeatures/CMakeLists.txt
@@ -128,26 +128,30 @@ foreach(lang CXX C)
endforeach()
if (CMAKE_C_COMPILE_FEATURES)
- string(FIND "${CMAKE_C_FLAGS}" "-std=" std_flag_idx)
- if (std_flag_idx EQUAL -1)
- add_executable(default_dialect_C default_dialect.c)
- target_compile_definitions(default_dialect_C PRIVATE
- DEFAULT_C11=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},11>
- DEFAULT_C99=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},99>
- DEFAULT_C90=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},90>
- )
+ if (CMAKE_C_STANDARD_DEFAULT)
+ string(FIND "${CMAKE_C_FLAGS}" "-std=" std_flag_idx)
+ if (std_flag_idx EQUAL -1)
+ add_executable(default_dialect_C default_dialect.c)
+ target_compile_definitions(default_dialect_C PRIVATE
+ DEFAULT_C11=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},11>
+ DEFAULT_C99=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},99>
+ DEFAULT_C90=$<EQUAL:${CMAKE_C_STANDARD_DEFAULT},90>
+ )
+ endif()
endif()
endif()
if (CMAKE_CXX_COMPILE_FEATURES)
- string(FIND "${CMAKE_CXX_FLAGS}" "-std=" std_flag_idx)
- if (std_flag_idx EQUAL -1)
- add_executable(default_dialect default_dialect.cpp)
- target_compile_definitions(default_dialect PRIVATE
- DEFAULT_CXX14=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},14>
- DEFAULT_CXX11=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},11>
- DEFAULT_CXX98=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},98>
- )
+ if (CMAKE_CXX_STANDARD_DEFAULT)
+ string(FIND "${CMAKE_CXX_FLAGS}" "-std=" std_flag_idx)
+ if (std_flag_idx EQUAL -1)
+ add_executable(default_dialect default_dialect.cpp)
+ target_compile_definitions(default_dialect PRIVATE
+ DEFAULT_CXX14=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},14>
+ DEFAULT_CXX11=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},11>
+ DEFAULT_CXX98=$<EQUAL:${CMAKE_CXX_STANDARD_DEFAULT},98>
+ )
+ endif()
endif()
add_executable(CompileFeatures main.cpp)
diff --git a/Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake b/Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake
index 376f75a..833a315 100644
--- a/Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CompileFeatures/RunCMakeTest.cmake
@@ -17,6 +17,8 @@ file(READ
"${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx_features.txt"
CXX_FEATURES
)
+include("${RunCMake_BINARY_DIR}/generate_feature_list-build/c_standard_default.cmake")
+include("${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx_standard_default.cmake")
if (NOT C_FEATURES)
run_cmake(NoSupportedCFeatures)
@@ -27,7 +29,9 @@ if (NOT CXX_FEATURES)
run_cmake(NoSupportedCxxFeatures)
run_cmake(NoSupportedCxxFeaturesGenex)
else()
- run_cmake(LinkImplementationFeatureCycle)
+ if(CXX_STANDARD_DEFAULT)
+ run_cmake(LinkImplementationFeatureCycle)
+ endif()
run_cmake(LinkImplementationFeatureCycleSolved)
if (";${CXX_FEATURES};" MATCHES ";cxx_final;")
@@ -38,17 +42,19 @@ else()
unset(RunCMake_TEST_OPTIONS)
endif()
-foreach(standard 98 11)
- file(READ
- "${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx${standard}_flag.txt"
- CXX${standard}_FLAG
- )
- if (CXX${standard}_FLAG STREQUAL NOTFOUND)
- run_cmake(RequireCXX${standard})
- run_cmake(RequireCXX${standard}Variable)
- endif()
- if (CXX${standard}EXT_FLAG STREQUAL NOTFOUND)
- run_cmake(RequireCXX${standard}Ext)
- run_cmake(RequireCXX${standard}ExtVariable)
- endif()
-endforeach()
+if(CXX_STANDARD_DEFAULT)
+ foreach(standard 98 11)
+ file(READ
+ "${RunCMake_BINARY_DIR}/generate_feature_list-build/cxx${standard}_flag.txt"
+ CXX${standard}_FLAG
+ )
+ if (CXX${standard}_FLAG STREQUAL NOTFOUND)
+ run_cmake(RequireCXX${standard})
+ run_cmake(RequireCXX${standard}Variable)
+ endif()
+ if (CXX${standard}EXT_FLAG STREQUAL NOTFOUND)
+ run_cmake(RequireCXX${standard}Ext)
+ run_cmake(RequireCXX${standard}ExtVariable)
+ endif()
+ endforeach()
+endif()
diff --git a/Tests/RunCMake/CompileFeatures/generate_feature_list.cmake b/Tests/RunCMake/CompileFeatures/generate_feature_list.cmake
index 09e17b1..5c58052 100644
--- a/Tests/RunCMake/CompileFeatures/generate_feature_list.cmake
+++ b/Tests/RunCMake/CompileFeatures/generate_feature_list.cmake
@@ -9,6 +9,20 @@ file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cxx_features.txt"
"${CMAKE_CXX_COMPILE_FEATURES}"
)
+if(DEFINED CMAKE_C_STANDARD_DEFAULT)
+ set(c_standard_default_code "set(C_STANDARD_DEFAULT \"${CMAKE_C_STANDARD_DEFAULT}\")\n")
+else()
+ set(c_standard_default_code "unset(C_STANDARD_DEFAULT)\n")
+endif()
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/c_standard_default.cmake" "${c_standard_default_code}")
+
+if(DEFINED CMAKE_CXX_STANDARD_DEFAULT)
+ set(cxx_standard_default_code "set(CXX_STANDARD_DEFAULT \"${CMAKE_CXX_STANDARD_DEFAULT}\")\n")
+else()
+ set(cxx_standard_default_code "unset(CXX_STANDARD_DEFAULT)\n")
+endif()
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cxx_standard_default.cmake" "${cxx_standard_default_code}")
+
foreach(standard 98 11)
set(CXX${standard}_FLAG NOTFOUND)
if (DEFINED CMAKE_CXX${standard}_STANDARD_COMPILE_OPTION)
generated by cgit v0.12 at 2024-10-19 08:34:19 (GMT)