Handling of sysroot-relative search-paths without explicit --sysroot parameter

Hello!

I have a question regarding sysroot-relative search paths. It seems that gcc will only substitute the = or $SYSROOT prefix if a “—sysroot” parameter was given on the command line. Is this intentional? To me it would seem that omitting a —sysroot parameter would imply using “/“. But this is not the case. Without a —sysroot parameter the = or $SYSROOT prefix is interpreted literally. Compare:


> echo | g++ -I=/tmp  -v -E -
...
ignoring nonexistent directory "=/tmp”
…

> echo | aarch64-elf-g++ -I=/tmp  --sysroot=/ -v -E -
...
#include <...> search starts here:
 //tmp
…



I am unsure if I should file a bug report for this or not.



Kind regards
Heiko Lewin
Software Engineer

worldiety GmbH
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