[Bug 242945] devel/cmake: bad interaction with non-default compilers: cmake loses ccache

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242945

            Bug ID: 242945
           Summary: devel/cmake: bad interaction with non-default
                    compilers: cmake loses ccache
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: kde at FreeBSD.org
          Reporter: mandree at FreeBSD.org
                CC: kde at FreeBSD.org, portmgr at FreeBSD.org,
                    ports-bugs at FreeBSD.org
             Flags: maintainer-feedback?(kde at FreeBSD.org)
                CC: kde at FreeBSD.org

Greetings,

our ccache rigging is incomplete and fails if a port uses cmake to build and
also a non-default compiler, such as a versioned cc/c++, or USE_GCC, or
thereabouts.

In that situation, cmake derives an absolute path (of the compiler) and loses
the ccache wrapper.

My current workaround, in, for instance, graphics/rawtherapee/Makefile, is:

.if "${WITH_CCACHE_BUILD}" == "yes" && !defined(NO_CCACHE)
CMAKE_ARGS+=    -DCMAKE_C_COMPILER_LAUNCHER=${CCACHE_BIN} \
                -DCMAKE_CXX_COMPILER_LAUNCHER=${CCACHE_BIN}
.endif

It would be good if either devel/cmake, or Mk/Uses/cmake.mk, or
Mk/bsd.ccache.mk would avoid the need of spilling this to all medium- to
heaviweight ports.

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