perf tools: Fix build by checking if extra warnings are supported
The -Wstack-protector and -Wvolatile-register-var warnings, for instance, are not supported by gcc 3.4.6. So fix by doing the same check we already do for -fstack-protector-all. With this and the other patches in this series, perf builds unmodified on, for instance, RHEL4. Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -204,13 +204,11 @@ EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wshadow
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Winit-self
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wpacked
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wredundant-decls
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wstack-protector
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wstrict-aliasing=3
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wswitch-default
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wswitch-enum
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wno-system-headers
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wundef
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wvolatile-register-var
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wwrite-strings
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wbad-function-cast
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EXTRA_WARNINGS := $(EXTRA_WARNINGS) -Wmissing-declarations
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@ -294,6 +292,13 @@ ifeq ($(call try-cc,$(SOURCE_HELLO),-Werror -fstack-protector-all),y)
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CFLAGS := $(CFLAGS) -fstack-protector-all
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endif
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ifeq ($(call try-cc,$(SOURCE_HELLO),-Werror -Wstack-protector),y)
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CFLAGS := $(CFLAGS) -Wstack-protector
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endif
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ifeq ($(call try-cc,$(SOURCE_HELLO),-Werror -Wvolatile-register-var),y)
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CFLAGS := $(CFLAGS) -Wvolatile-register-var
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endif
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### --- END CONFIGURATION SECTION ---
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