https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102803
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |UNCONFIRMED
Ever confirmed|1 |0
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Ubuntu's GCC is built with --with-sysroot=/ which sounds like the issue here
really. So when you install it a different directory, it uses a new sysroot of
that directory.
And GCC calls realpath on the "./usr/bin/../../" for the sysroot.
Here is the configure line for Ubuntu 1804 (aarch64)'s GCC:
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
7.4.0-1ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7
--program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-libquadmath --disable-libquadmath-support --enable-plugin
--enable-default-pie --with-system-zlib --enable-multiarch
--enable-fix-cortex-a53-843419 --disable-werror --enable-checking=release
--build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu
So you can see the --with-sysroot=/ option.
try this:
./usr/bin/gcc -no-canonical-prefixes -print-sysroot
See what it prints.
