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backtrace.h not installed with --enable-plugin

Hello All,

I compiled a gcc-7.1 release tree configured with

'../gcc-7.1.0/configure' '--program-suffix=-7my' '--enable-shared' '--enable-linker-build-id' '--without-included-gettext' '--enable-threads=posix' '--with-sysroot=/' '--enable-clocale=gnu' '--enable-libstdcxx-debug' '--enable-libstdcxx-time=yes' '--with-default-libstdcxx-abi=new' '--enable-gnu-unique-object' '--enable-libmpx' '--enable-plugin' '--enable-default-pie' '--with-system-zlib' '--enable-multiarch' '--with-arch-32=i686' '--with-abi=m64' '--with-multilib-list=m32,m64,mx32' '--enable-multilib' '--with-tune=native' '--enable-checking=release' '--enable-languages=c,c++,go,lto'

I was expecting the installed built tree to contain the backtrace.h from Ian Taylor's libbacktrace. This is not the case. Why? What configure option did I miss?

notice that ../gcc-7.1.0/configure --help don't mention backtrace

(is that a bug, perhaps at least in the documentation or in ../gcc-7.1.0/ ?? Or am I misunderstanding something??)

Basile Starynkevitch (France)

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