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Don't hardcode the -O2
compiler flag
autoconf authors apparently decided that setting `-O2` by default was a good idea. I disagree, and Nix has its own way of deciding that (with `OPTIMIZE={0,1}`). Explicitly set `CFLAGS` and `CXXFLAGS` in the configure script to disable that behaviour. Fix #9965
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@ -47,6 +47,10 @@ AC_DEFINE_UNQUOTED(SYSTEM, ["$system"], [platform identifier ('cpu-os')])
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# State should be stored in /nix/var, unless the user overrides it explicitly.
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test "$localstatedir" = '${prefix}/var' && localstatedir=/nix/var
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# Assign a default value to C{,XX}FLAGS as the default configure script sets them
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# to -O2 otherwise, which we don't want to have hardcoded
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CFLAGS=${CFLAGS-""}
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CXXFLAGS=${CXXFLAGS-""}
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AC_PROG_CC
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AC_PROG_CXX
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