Sanify the default cc flags.
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mk/cc.mk
29
mk/cc.mk
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# Copyright 2008 Roy Marples <roy@marples.name>
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# Setup some good default CFLAGS
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CFLAGS?= -O2
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CFLAGS?= -O2 -pipe
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# Default to using the C99 standard
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CSTD?= c99
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_CSTD_SH= if test -n "${CSTD}"; then echo "-std=${CSTD}"; else echo ""; fi
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_CSTD!= ${_CSTD_SH}
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CFLAGS+= ${_CSTD}$(shell ${_CSTD_SH})
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# GNU Make way of detecting gcc flags we can use
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check_gcc=$(shell if ${CC} $(1) -S -o /dev/null -xc /dev/null >/dev/null 2>&1; \
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then echo "$(1)"; else echo "$(2)"; fi)
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# pmake check for extra cflags
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WEXTRA!= for x in -Wdeclaration-after-statement -Wsequence-point -Wextra; do \
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if ${CC} $$x -S -o /dev/null -xc /dev/null >/dev/null 2>&1; \
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then echo -n "$$x "; fi \
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done
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# Loads of nice flags to ensure our code is good
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CFLAGS+= -pedantic \
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-Wall -Wunused -Wimplicit -Wshadow -Wformat=2 \
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# Try and use some good cc flags
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_CC_FLAGS= -pedantic -Wall -Wunused -Wimplicit -Wshadow -Wformat=2 \
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-Wmissing-declarations -Wno-missing-prototypes -Wwrite-strings \
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-Wbad-function-cast -Wnested-externs -Wcomment -Winline \
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-Wchar-subscripts -Wcast-align -Wno-format-nonliteral \
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$(call check_gcc, -Wdeclaration-after-statement) \
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$(call check_gcc, -Wsequence-point) \
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$(call check_gcc, -Wextra) ${WEXTRA}
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-Wdeclaration-after-statement -Wsequence-point -Wextra
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_CC_FLAGS_SH= for f in ${_CC_FLAGS}; do \
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if ${CC} $$f -S -o /dev/null -xc /dev/null >/dev/null 2>&1; \
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then printf "%s" "$$f "; fi \
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done
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_CC_FLAGS!= ${_CC_FLAGS_SH}
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CFLAGS+= ${_CC_FLAGS}$(shell ${CC_FLAGS_SH})
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