The following issue has been SUBMITTED.
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http://www.cmake.org/Bug/view.php?id=15550
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Reported By: Daniel Schepler
Assigned To:
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Project: CMake
Issue ID: 15550
Category: CMake
Reproducibility: always
Severity: minor
Priority: normal
Status: new
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Date Submitted: 2015-05-01 10:26 PDT
Last Modified: 2015-05-01 10:26 PDT
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Summary: check_cxx_source_compiles() does not honor
CMAKE_CXX_STANDARD
Description:
In a project I recently converted to use set(CMAKE_CXX_STANDARD 11) instead of
the previous hard coding of -std=* compile flags in cxx_flag_overrides.cmake, I
just noticed that our test for std::unordered_map<> broke.
Steps to Reproduce:
set(CMAKE_CXX_STANDARD 11)
check_cxx_source_compiles(
"#include <unordered_map>
int main() {
std::unordered_map<int, int> m;
return m.size();
}"
HAVE_STD_UNORDERED_MAP)
Additional Information:
I can work around that with set(CMAKE_REQUIRED_FLAGS
${CMAKE_CXX11_EXTENSION_COMPILE_OPTION}) . That seems a bit ugly, though.
I'm not sure what a proper "fix" to this would be. My ideas would be adding
*_STANDARD arguments to try_compile() which might not quite be scalable; or
maybe having check_cxx_source_compiles add -DCMAKE_CXX_STANDARD=... to the
CMAKE_FLAGS it passes to try_compile(), based on CMAKE_CXX_STANDARD which could
be overridden by setting CMAKE_REQUIRED_CXX_STANDARD which also seems like it
might not be the best possible solution.
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Issue History
Date Modified Username Field Change
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2015-05-01 10:26 Daniel ScheplerNew Issue
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