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add explanatory comments to Makefiles

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This commit is contained in:
Kill Your TV 2014-12-17 20:46:19 +00:00
parent 21e3778e69
commit b343c24a9f
3 changed files with 29 additions and 9 deletions
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17
Makefile.linux
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@ -1,18 +1,25 @@
CXXFLAGS = -g -Wall -fPIC
INCFLAGS =
## NOTE: The NEEDED_CXXFLAGS are here so that custom CXXFLAGS can be specified at build time
## **without** overwriting the CXXFLAGS which we need in order to build.
## For example, when adding 'hardening flags' to the build
## (e.g. -fstack-protector-strong -Wformat -Werror=format-security), we do not want to remove
## -std=c++11. If you want to remove this variable please do so in a way that allows setting
## custom FLAGS to work at build-time.
# detect proper flag for c++11 support by gcc
CXXVER := $(shell $(CXX) -dumpversion)
ifeq ($(shell expr match ${CXXVER} "4\.[0-9][0-9]"),4) # >= 4.10
NEEDED_CXXFLAGS += -std=c++11
NEEDED_CXXFLAGS += -std=c++11
else ifeq ($(shell expr match ${CXXVER} "4\.[7-9]"),3) # >= 4.7
NEEDED_CXXFLAGS += -std=c++11
NEEDED_CXXFLAGS += -std=c++11
else ifeq ($(shell expr match ${CXXVER} "4\.6"),3) # = 4.6
NEEDED_CXXFLAGS += -std=c++0x
NEEDED_CXXFLAGS += -std=c++0x
else ifeq ($(shell expr match $(CXX) 'clang'),5)
NEEDED_CXXFLAGS += -std=c++11
NEEDED_CXXFLAGS += -std=c++11
else # not supported
$(error Compiler too old)
$(error Compiler too old)
endif
ifeq ($(USE_STATIC),yes)