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build: don't pass -w when building for Windows

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This has been around since the introduction of autotools. However at
this point I'm not sure we'd every want to suppress all warnings when
performing a build, and given that CXX FLAGS will have been overriden
when cross-compiling for Windows (using depends), this would rarely,
if-ever be used anyways.

From https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html:
-w

    Inhibit all warning messages.
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fanquake 2020-05-10 19:27:15 +08:00
parent 88d8b4e182
commit 89fea68ffd
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configure.ac
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@ -576,9 +576,6 @@ case $host in
fi
CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB -D_WIN32_WINNT=0x0601"
if test "x$CXXFLAGS_overridden" = "xno"; then
CXXFLAGS="$CXXFLAGS -w"
fi
dnl libtool insists upon adding -nostdlib and a list of objects/libs to link against.
dnl That breaks our ability to build dll's with static libgcc/libstdc++/libssp. Override