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make: del no-delete-null-pointer-checks for clang++

This PR enables the use of clang++ to compile C++ projects by adding
`CXXUWFLAGS += -fno-delete-null-pointer-checks`, if `${CC}` understands
`-fno-delete-null-pointer-checks` but `${CXX}` does not.
dev/timer
René Kijewski 8 years ago
parent
commit
9f5b65166a
  1. 35
      Makefile.cflags

35
Makefile.cflags

@ -2,13 +2,13 @@
# Otherwise test if the compiler unterstands the "-std=gnu99" flag, and use it if so.
# Otherwise test if the compiler unterstands the "-std=c99" flag, and use it if so.
ifeq ($(filter -std=%,$(CFLAGS)),)
ifeq ($(shell $(CC) -std=gnu99 -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
CFLAGS += -std=gnu99
else
ifeq ($(shell $(CC) -std=c99 -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
CFLAGS += -std=c99
endif
endif
ifeq ($(shell $(CC) -std=gnu99 -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
CFLAGS += -std=gnu99
else
ifeq ($(shell $(CC) -std=c99 -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
CFLAGS += -std=c99
endif
endif
endif
# Add `-fno-delete-null-pointer-checks` flag iff the compiler supports it.
@ -17,18 +17,27 @@ endif
# Right now clang does not use the *delete-null-pointer* optimization, and does not understand the parameter.
# Related issues: #628, #664.
ifeq ($(shell $(CC) -fno-delete-null-pointer-checks -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
ifeq ($(shell LANG=C $(CC) -fno-delete-null-pointer-checks -E - 2>&1 1>/dev/null </dev/null | grep warning: | grep -- -fno-delete-null-pointer-checks),)
CFLAGS += -fno-delete-null-pointer-checks
endif
ifeq ($(shell LANG=C $(CC) -fno-delete-null-pointer-checks -E - 2>&1 1>/dev/null </dev/null | grep warning: | grep -- -fno-delete-null-pointer-checks),)
CFLAGS += -fno-delete-null-pointer-checks
ifneq ($(shell $(CXX) -fno-delete-null-pointer-checks -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
CXXUWFLAGS += -fno-delete-null-pointer-checks
else
ifneq ($(shell LANG=C $(CXX) -fno-delete-null-pointer-checks -E - 2>&1 1>/dev/null </dev/null | grep warning: | grep -- -fno-delete-null-pointer-checks),)
CXXUWFLAGS += -fno-delete-null-pointer-checks
endif
endif
endif
endif
# Fast-out on old style function definitions.
# They cause unreadable error compiler errors on missing semicolons.
# Worse yet they hide errors by accepting wildcard argument types.
ifeq ($(shell $(CC) -Wstrict-prototypes -Werror=strict-prototypes -Wold-style-definition -Werror=old-style-definition -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
# duplicated parameters don't hurt
CFLAGS += -Wstrict-prototypes -Werror=strict-prototypes -Wold-style-definition -Werror=old-style-definition
# duplicated parameters don't hurt
CFLAGS += -Wstrict-prototypes -Werror=strict-prototypes -Wold-style-definition -Werror=old-style-definition
CXXUWFLAGS += -Wstrict-prototypes -Wold-style-definition
endif
# Unwanted flags for c++
CXXUWFLAGS += -std=gnu99 -std=c99 -Wstrict-prototypes -Wold-style-definition
CXXUWFLAGS += -std=%

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