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[contrib/pzstd] Detect and Select Maximum Available C++ Standard

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Rather than remove the flag entirely, as proposed in #3499, this commit uses
the newest C++ standard the compiler supports. This retains the selection of
using only standardized features (excluding GNU extensions) and keeps the
recency requirements of the codebase explicit.

Tested with various versions of `g++` and `clang++`.
This commit is contained in:
W. Felix Handte
2023-03-27 11:24:47 -04:00
parent 167157dd74
commit 1b8bddc41e
1 changed files with 20 additions and 1 deletions
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21
contrib/pzstd/Makefile
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@ -37,10 +37,29 @@ 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
PZSTD_CXX_STD := -std=c++11
endif
endif
endif
endif
PZSTD_CPPFLAGS = $(PZSTD_INC)
PZSTD_CCXXFLAGS =
PZSTD_CFLAGS = $(PZSTD_CCXXFLAGS)
PZSTD_CXXFLAGS = $(PZSTD_CCXXFLAGS) -std=c++11
PZSTD_CXXFLAGS = $(PZSTD_CCXXFLAGS) $(PZSTD_CXX_STD)
PZSTD_LDFLAGS =
EXTRA_FLAGS =
ALL_CFLAGS = $(EXTRA_FLAGS) $(CPPFLAGS) $(PZSTD_CPPFLAGS) $(CFLAGS) $(PZSTD_CFLAGS)