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24 lines
1.2 KiB
Makefile
24 lines
1.2 KiB
Makefile
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# 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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endif
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endif
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