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d0294dd70e
Compare scan-build's [documentation][1]: > ALWAYS analyze a project in its "debug" configuration > > Most projects can be built in a "debug" mode that enables assertions. > Assertions are picked up by the static analyzer to prune infeasible > paths, which in some cases can greatly reduce the number of false > positives (bogus error reports) emitted by the tool. Closes #3960. 1: http://clang-analyzer.llvm.org/scan-build.html#recommended_debug
69 lines
2.8 KiB
Makefile
69 lines
2.8 KiB
Makefile
# Test if the input language was specified externally.
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# Otherwise test if the compiler unterstands the "-std=gnu99" flag, and use it if so.
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# Otherwise test if the compiler unterstands the "-std=c99" flag, and use it if so.
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ifeq ($(filter -std=%,$(CFLAGS)),)
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ifeq ($(shell $(CC) -std=gnu99 -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
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CFLAGS += -std=gnu99
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else
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ifeq ($(shell $(CC) -std=c99 -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
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CFLAGS += -std=c99
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endif
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endif
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endif
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# Add `-fno-delete-null-pointer-checks` flag iff the compiler supports it.
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# GCC removes moves tests whether `x == NULL`, if previously `x` or even `x->y` was accessed.
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# 0x0 might be a sane memory location for embedded systems, so the test must not be removed.
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# Right now clang does not use the *delete-null-pointer* optimization, and does not understand the parameter.
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# Related issues: #628, #664.
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ifeq ($(shell $(CC) -fno-delete-null-pointer-checks -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
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ifeq ($(shell LANG=C $(CC) -fno-delete-null-pointer-checks -E - 2>&1 1>/dev/null </dev/null | grep warning: | grep -- -fno-delete-null-pointer-checks),)
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CFLAGS += -fno-delete-null-pointer-checks
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ifneq ($(shell $(CXX) -fno-delete-null-pointer-checks -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
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CXXUWFLAGS += -fno-delete-null-pointer-checks
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else
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ifneq ($(shell LANG=C $(CXX) -fno-delete-null-pointer-checks -E - 2>&1 1>/dev/null </dev/null | grep warning: | grep -- -fno-delete-null-pointer-checks),)
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CXXUWFLAGS += -fno-delete-null-pointer-checks
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endif
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endif
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endif
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endif
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# Fast-out on old style function definitions.
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# They cause unreadable error compiler errors on missing semicolons.
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# Worse yet they hide errors by accepting wildcard argument types.
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ifeq ($(shell $(CC) -Wstrict-prototypes -Werror=strict-prototypes -Wold-style-definition -Werror=old-style-definition -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
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# duplicated parameters don't hurt
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CFLAGS += -Wstrict-prototypes -Werror=strict-prototypes -Wold-style-definition -Werror=old-style-definition
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CXXUWFLAGS += -Wstrict-prototypes -Wold-style-definition
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endif
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# Unwanted flags for c++
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CXXUWFLAGS += -std=%
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ifeq ($(LTO),yes)
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$(info Building with Link-Time-Optimizations is currently an experimental feature. Expect broken binaries.)
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LTOFLAGS = -flto -ffat-lto-objects
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CFLAGS += ${LTOFLAGS}
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LINKFLAGS += ${LTOFLAGS}
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endif
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# Forbid common symbols to prevent accidental aliasing.
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CFLAGS += -fno-common
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# Enable all default warnings
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CFLAGS += -Wall
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ifeq (,$(filter -DDEVELHELP,$(CFLAGS)))
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ifneq (1,$(FORCE_ASSERTS))
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CFLAGS += -DNDEBUG
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endif
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endif
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# Default ARFLAGS for platforms which do not specify it.
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# Note: make by default provides ARFLAGS=rv which we want to override
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ifeq ($(origin ARFLAGS),default)
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ARFLAGS = rcs
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endif
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