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build: add -Wexpansion-to-defined

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This warning is included in -Wall by clang, but not by GCC (which only
enables it for -Wextra). Include it in the list of warnings we enable
to minimize the differences between the compilers:

Backports commit b98fcfd8840f290c406c32301340e96f00238a93 from qemu
This commit is contained in:
Paolo Bonzini 2018-03-03 22:12:24 -05:00 committed by Lioncash
parent 9926281c05
commit 7b337b9c07
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1 changed files with 1 additions and 1 deletions
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qemu/configure vendored
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@ -702,7 +702,7 @@ gcc_flags="-Wold-style-declaration -Wold-style-definition -Wtype-limits"
gcc_flags="-Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers $gcc_flags"
gcc_flags="-Wmissing-include-dirs -Wempty-body -Wnested-externs $gcc_flags"
gcc_flags="-Wendif-labels $gcc_flags"
gcc_flags="-Wno-initializer-overrides $gcc_flags"
gcc_flags="-Wno-initializer-overrides -Wexpansion-to-defined $gcc_flags"
gcc_flags="-Wno-string-plus-int $gcc_flags"
# Note that we do not add -Werror to gcc_flags here, because that would
# enable it for all configure tests. If a configure test failed due