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Detect C++14 compiler support

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This commit is contained in:
Victor Zverovich
2017-09-28 08:57:54 -07:00
parent be5b4552d9
commit d5e918b61f
7 changed files with 36 additions and 36 deletions
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support/cmake/cxx11.cmake → support/cmake/cxx14.cmake
+22 -22
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@@ -1,55 +1,55 @@
# C++11 feature support detection
# C++14 feature support detection
if (NOT FMT_USE_CPP11)
if (NOT FMT_USE_CPP14)
return()
endif ()
include(CheckCXXCompilerFlag)
if (FMT_USE_CPP11)
check_cxx_compiler_flag(-std=c++11 HAVE_STD_CPP11_FLAG)
if (HAVE_STD_CPP11_FLAG)
# Check if including cmath works with -std=c++11 and -O3.
if (FMT_USE_CPP14)
check_cxx_compiler_flag(-std=c++14 HAVE_STD_CPP14_FLAG)
if (HAVE_STD_CPP14_FLAG)
# Check if including cmath works with -std=c++14 and -O3.
# It may not in MinGW due to bug http://ehc.ac/p/mingw/bugs/2250/.
set(CMAKE_REQUIRED_FLAGS "-std=c++11 -O3")
set(CMAKE_REQUIRED_FLAGS "-std=c++14 -O3")
check_cxx_source_compiles("
#include <cmath>
int main() {}" FMT_CPP11_CMATH)
# Check if including <unistd.h> works with -std=c++11.
int main() {}" FMT_CPP14_CMATH)
# Check if including <unistd.h> works with -std=c++14.
# It may not in MinGW due to bug http://sourceforge.net/p/mingw/bugs/2024/.
check_cxx_source_compiles("
#include <unistd.h>
int main() {}" FMT_CPP11_UNISTD_H)
# Check if snprintf works with -std=c++11. It may not in MinGW.
int main() {}" FMT_CPP14_UNISTD_H)
# Check if snprintf works with -std=c++14. It may not in MinGW.
check_cxx_source_compiles("
#include <stdio.h>
int main() {
char buffer[10];
snprintf(buffer, 10, \"foo\");
}" FMT_CPP11_SNPRINTF)
if (FMT_CPP11_CMATH AND FMT_CPP11_UNISTD_H AND FMT_CPP11_SNPRINTF)
set(CPP11_FLAG -std=c++11)
}" FMT_CPP14_SNPRINTF)
if (FMT_CPP14_CMATH AND FMT_CPP14_UNISTD_H AND FMT_CPP14_SNPRINTF)
set(CPP14_FLAG -std=c++14)
else ()
check_cxx_compiler_flag(-std=gnu++11 HAVE_STD_GNUPP11_FLAG)
if (HAVE_STD_CPP11_FLAG)
set(CPP11_FLAG -std=gnu++11)
check_cxx_compiler_flag(-std=gnu++14 HAVE_STD_GNUPP14_FLAG)
if (HAVE_STD_CPP14_FLAG)
set(CPP14_FLAG -std=gnu++14)
endif ()
endif ()
set(CMAKE_REQUIRED_FLAGS )
else ()
check_cxx_compiler_flag(-std=c++0x HAVE_STD_CPP0X_FLAG)
if (HAVE_STD_CPP0X_FLAG)
set(CPP11_FLAG -std=c++0x)
check_cxx_compiler_flag(-std=c++1y HAVE_STD_CPP1Y_FLAG)
if (HAVE_STD_CPP1Y_FLAG)
set(CPP14_FLAG -std=c++1y)
endif ()
endif ()
endif ()
if (CMAKE_CXX_STANDARD)
# Don't use -std compiler flag if CMAKE_CXX_STANDARD is specified.
set(CPP11_FLAG )
set(CPP14_FLAG )
endif ()
set(CMAKE_REQUIRED_FLAGS ${CPP11_FLAG})
set(CMAKE_REQUIRED_FLAGS ${CPP14_FLAG})
# Check if variadic templates are working and not affected by GCC bug 39653:
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39653