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38 lines
1.7 KiB
38 lines
1.7 KiB
commit a7e9853db925b12b1d040be8b04bafc11d84d685
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Author: Willy Tarreau <w@1wt.eu>
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Date: Tue Oct 16 18:11:34 2018 +0200
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BUILD: Makefile: silence an option conflict warning with clang
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clang complains that -fno-strict-overflow is not used when -fwrapv is
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used, which breaks the build when -Werror is used. Let's introduce a
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cc-opt-alt function to emit the former only then the latter is not
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supported (since it implies the former).
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(cherry picked from commit 0d7a2ae4f5199ec37ead6914fa24d40ec0989a4d)
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Signed-off-by: Willy Tarreau <w@1wt.eu>
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diff --git a/Makefile b/Makefile
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index 1a971f92..6ffc1b06 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -98,6 +98,9 @@
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# call it only once.
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cc-opt = $(shell set -e; if $(CC) $(1) -E -xc - -o /dev/null </dev/null >&0 2>&0; then echo "$(1)"; fi;)
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+# same but emits $2 if $1 is not supported
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+cc-opt-alt = $(shell set -e; if $(CC) $(1) -E -xc - -o /dev/null </dev/null >&0 2>&0; then echo "$(1)"; else echo "$(2)"; fi;)
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+
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# Disable a warning when supported by the compiler. Don't put spaces around the
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# warning! And don't use cc-opt which doesn't always report an error until
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# another one is also returned.
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@@ -147,8 +150,7 @@ DEBUG_CFLAGS = -g
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# can do whatever it wants since it's an undefined behavior, so use -fwrapv
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# to be sure we get the intended behavior.
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SPEC_CFLAGS := -fno-strict-aliasing -Wdeclaration-after-statement
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-SPEC_CFLAGS += $(call cc-opt,-fwrapv)
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-SPEC_CFLAGS += $(call cc-opt,-fno-strict-overflow)
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+SPEC_CFLAGS += $(call cc-opt-alt,-fwrapv,$(call cc-opt,-fno-strict-overflow))
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SPEC_CFLAGS += $(call cc-nowarn,format-truncation)
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SPEC_CFLAGS += $(call cc-nowarn,address-of-packed-member)
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SPEC_CFLAGS += $(call cc-nowarn,null-dereference)
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