build system: Add various compiler flags that enable warnings on UB
Some types of Undefined Behavior can be determined statically at compile time and gcc now has a set of flags that make it emit warnings in that case instead of doing the __builtin_trap() / optimize / UD2-opcode dance that silently breaks the resulting binary. BUG=chromium:958270 BRANCH=none TEST=abuild passes (probably not) Change-Id: I3aa5ca00c9838cc7517160069310a1ef85372027 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/32814 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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@ -419,6 +419,7 @@ CFLAGS_common += -fno-delete-null-pointer-checks
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ifeq ($(CCC_ANALYZER_OUTPUT_FORMAT),)
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CFLAGS_common += -Wno-packed-not-aligned
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CFLAGS_common += -fconserve-stack
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CFLAGS_common += -Wnull-dereference -Wreturn-type
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# cf. commit f69a99db (coreboot: x86: enable gc-sections)
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CFLAGS_common += -Wno-unused-but-set-variable
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endif
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