[PATCH] D58682: Add secondary libstdc++ 4.8 and 5.1 detection mechanisms
Hubert Tong via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Mar 5 19:32:38 PST 2019
hubert.reinterpretcast updated this revision to Diff 189443.
hubert.reinterpretcast added a comment.
Address review comment: Add note re: _GLIBCXX_RELEASE
Repository:
rL LLVM
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D58682/new/
https://reviews.llvm.org/D58682
Files:
cmake/modules/CheckCompilerVersion.cmake
Index: cmake/modules/CheckCompilerVersion.cmake
===================================================================
--- cmake/modules/CheckCompilerVersion.cmake
+++ cmake/modules/CheckCompilerVersion.cmake
@@ -58,6 +58,8 @@
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++0x")
+ # Test for libstdc++ version of at least 4.8 by checking for _ZNKSt17bad_function_call4whatEv.
+ # Note: We should check _GLIBCXX_RELEASE when possible (i.e., for GCC 7.1 and up).
check_cxx_source_compiles("
#include <iosfwd>
#if defined(__GLIBCXX__)
@@ -65,12 +67,20 @@
#error Unsupported libstdc++ version
#endif
#endif
-int main() { return 0; }
+#if defined(__GLIBCXX__)
+extern const char _ZNKSt17bad_function_call4whatEv[];
+const char *chk = _ZNKSt17bad_function_call4whatEv;
+#else
+const char *chk = \"\";
+#endif
+int main() { ++chk; return 0; }
"
LLVM_LIBSTDCXX_MIN)
if(NOT LLVM_LIBSTDCXX_MIN)
message(FATAL_ERROR "libstdc++ version must be at least ${GCC_MIN}.")
endif()
+ # Test for libstdc++ version of at least 5.1 by checking for std::iostream_category().
+ # Note: We should check _GLIBCXX_RELEASE when possible (i.e., for GCC 7.1 and up).
check_cxx_source_compiles("
#include <iosfwd>
#if defined(__GLIBCXX__)
@@ -78,6 +88,10 @@
#error Unsupported libstdc++ version
#endif
#endif
+#if defined(__GLIBCXX__)
+#include <ios>
+void foo(void) { (void) std::iostream_category(); }
+#endif
int main() { return 0; }
"
LLVM_LIBSTDCXX_SOFT_ERROR)
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