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commit 48bb14bdbbeb09cb3cd950d7346688958f1bce1a
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Author: Joseph Myers <joseph@codesourcery.com>
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Date:   Thu Aug 20 20:50:05 2015 +0000
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    Don't use -Wno-error=undef.
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    This patch removes the use of -Wno-error=undef, so that -Wundef
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    warnings become errors.
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    Tested for x86_64, x86, mips64 (all three ABIs) and arm.
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            * Makeconfig [$(enable-werror) = yes] (+gccwarn): Do not add
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            -Wno-error=undef.
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diff --git a/Makeconfig b/Makeconfig
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index b1bf7f24b6154e3d..3c0d4abc5f5f30df 100644
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--- a/Makeconfig
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+++ b/Makeconfig
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@@ -645,7 +645,7 @@ else
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 endif
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 +gccwarn += -Wundef
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 ifeq ($(enable-werror),yes)
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-+gccwarn += -Werror -Wno-error=undef
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++gccwarn += -Werror
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 endif
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 +gccwarn-c = -Wstrict-prototypes
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