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Switch Strategies: Only Set -std=c++11 When Default is Older

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This commit is contained in:
W. Felix Handte
2023-03-27 18:37:19 -04:00
parent 1b8bddc41e
commit cbe0f0e435
1 changed files with 3 additions and 16 deletions
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19
contrib/pzstd/Makefile
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@ -37,24 +37,11 @@ CFLAGS += -Wno-deprecated-declarations
PZSTD_INC = -I$(ZSTDDIR) -I$(ZSTDDIR)/common -I$(PROGDIR) -I.
GTEST_INC = -isystem googletest/googletest/include
# Select newest C++ standard available, minimum C++11
ifeq ($(shell echo | $(CXX) -x c++ -Werror -std=c++23 -c - -o /dev/null 2>/dev/null && echo 1 || echo 0),1)
PZSTD_CXX_STD := -std=c++23
else
ifeq ($(shell echo | $(CXX) -x c++ -Werror -std=c++20 -c - -o /dev/null 2>/dev/null && echo 1 || echo 0),1)
PZSTD_CXX_STD := -std=c++20
else
ifeq ($(shell echo | $(CXX) -x c++ -Werror -std=c++17 -c - -o /dev/null 2>/dev/null && echo 1 || echo 0),1)
PZSTD_CXX_STD := -std=c++17
else
ifeq ($(shell echo | $(CXX) -x c++ -Werror -std=c++14 -c - -o /dev/null 2>/dev/null && echo 1 || echo 0),1)
PZSTD_CXX_STD := -std=c++14
else
# If default C++ version is older than C++11, explicitly set C++11, which is the
# minimum required by the code.
ifeq ($(shell echo "\043if __cplusplus < 201103L\n\043error\n\043endif" | $(CXX) -x c++ -Werror -c - -o /dev/null 2>/dev/null && echo 1 || echo 0),0)
PZSTD_CXX_STD := -std=c++11
endif
endif
endif
endif
PZSTD_CPPFLAGS = $(PZSTD_INC)
PZSTD_CCXXFLAGS =