[Bug 267971] devel/cmake-core: cmake doesn't respect PATH when it resolves CMAKE_CXX_COMPILER for g++11

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267971

            Bug ID: 267971
           Summary: devel/cmake-core: cmake doesn't respect PATH when it
                    resolves CMAKE_CXX_COMPILER for g++11
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: kde at FreeBSD.org
          Reporter: yuri at freebsd.org
          Assignee: kde at FreeBSD.org
             Flags: maintainer-feedback?(kde at FreeBSD.org)

Created attachment 238311
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=238311&action=edit
cmake-PATH.shar

Please consider that both c++ and g++11 are not in /usr/local/bin, but instead
they are in /usr/local/libexec/ccache, which is placed first in PATH.

When cmake is called with -DCMAKE_CXX_COMPILER=g++11 and the
CMAKE_PREFIX_PATH="/usr/local" environment variable is set - CMAKE_CXX_COMPILER
ends up being /usr/local/bin/g++11 regardless of PATH.

But if in the above invocation g++11 is replaced with c++ - CMAKE_CXX_COMPILER
is resolved through PATH as it should be.

The attached program demonstrates this problem.

Execute run.sh from the attached shar archive. It has 2 sections, GOOD and BAD.
BAD section has CMAKE_PREFIX_PATH="/usr/local" and it shows that
CMAKE_CXX_COMPILER=/usr/local/bin/g++11

If you would replaces g++11 with c++ - this problem would go away.

This problem prevents CCACHE from working for projects that use GCC.

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