Set LLVM_SLOT in pkg_setup() to the selected LLVM slot, for inspection
from the package.  For example, it can be used to easily compare
the version number.

Split get_llvm_slot() out of get_llvm_prefix() to factor out the common
code.

Signed-off-by: Michał Górny <mgo...@gentoo.org>
---
 eclass/llvm.eclass | 53 ++++++++++++++++++++++++++++++----------------
 1 file changed, 35 insertions(+), 18 deletions(-)

diff --git a/eclass/llvm.eclass b/eclass/llvm.eclass
index 16596ec2ea66..92c05c308f91 100644
--- a/eclass/llvm.eclass
+++ b/eclass/llvm.eclass
@@ -87,11 +87,10 @@ DEPEND="!!sys-devel/llvm:0"
 # Correct values of LLVM slots, newest first.
 declare -g -r _LLVM_KNOWN_SLOTS=( {16..8} )
 
-# @FUNCTION: get_llvm_prefix
+# @FUNCTION: get_llvm_slot
 # @USAGE: [-b|-d] [<max_slot>]
-# @DESCRIPTION:
 # Find the newest LLVM install that is acceptable for the package,
-# and print an absolute path to it.
+# and print its major version number (i.e. slot).
 #
 # If -b is specified, the checks are performed relative to BROOT,
 # and BROOT-path is returned.  This is appropriate when your package
@@ -114,7 +113,7 @@ declare -g -r _LLVM_KNOWN_SLOTS=( {16..8} )
 # is acceptable, false otherwise. If llvm_check_deps() is not defined,
 # the function defaults to checking whether sys-devel/llvm:${LLVM_SLOT}
 # is installed.
-get_llvm_prefix() {
+get_llvm_slot() {
        debug-print-function ${FUNCNAME} "${@}"
 
        local hv_switch=-d
@@ -126,23 +125,12 @@ get_llvm_prefix() {
                shift
        done
 
-       local prefix=
-       if [[ ${EAPI} != 6 ]]; then
-               case ${hv_switch} in
-                       -b)
-                               prefix=${BROOT}
-                               ;;
-                       -d)
-                               prefix=${ESYSROOT}
-                               ;;
-               esac
-       else
+       if [[ ${EAPI} == 6 ]]; then
                case ${hv_switch} in
                        -b)
                                die "${FUNCNAME} -b is not supported in EAPI 
${EAPI}"
                                ;;
                        -d)
-                               prefix=${EPREFIX}
                                hv_switch=
                                ;;
                esac
@@ -168,7 +156,7 @@ get_llvm_prefix() {
                        has_version ${hv_switch} "sys-devel/llvm:${slot}" || 
continue
                fi
 
-               echo "${prefix}/usr/lib/llvm/${slot}"
+               echo "${slot}"
                return
        done
 
@@ -180,6 +168,31 @@ get_llvm_prefix() {
        die "No LLVM slot${1:+ <= ${1}} satisfying the package's dependencies 
found installed!"
 }
 
+# @FUNCTION: get_llvm_prefix
+# @USAGE: [-b|-d] [<max_slot>]
+# @DESCRIPTION:
+# Find the newest LLVM install that is acceptable for the package,
+# and print an absolute path to it.
+#
+# The options and behavior is the same as for get_llvm_slot.
+get_llvm_prefix() {
+       debug-print-function ${FUNCNAME} "${@}"
+
+       local prefix=${EPREFIX}
+       if [[ ${EAPI} != 6 ]]; then
+               case ${1} in
+                       -b)
+                               prefix=${BROOT}
+                               ;;
+                       *)
+                               prefix=${ESYSROOT}
+                               ;;
+               esac
+       fi
+
+       echo "${prefix}/usr/lib/llvm/$(get_llvm_slot "${@}")"
+}
+
 # @FUNCTION: llvm_fix_clang_version
 # @USAGE: <variable-name>...
 # @DESCRIPTION:
@@ -256,12 +269,16 @@ llvm_pkg_setup() {
        debug-print-function ${FUNCNAME} "${@}"
 
        if [[ ${MERGE_TYPE} != binary ]]; then
+               LLVM_SLOT=$(get_llvm_slot "${LLVM_MAX_SLOT}")
+
                llvm_fix_clang_version CC CPP CXX
                # keep in sync with profiles/features/llvm/make.defaults!
                llvm_fix_tool_path ADDR2LINE AR AS LD NM OBJCOPY OBJDUMP RANLIB
                llvm_fix_tool_path READELF STRINGS STRIP
 
-               local llvm_path=$(get_llvm_prefix "${LLVM_MAX_SLOT}")/bin
+               local prefix=${EPREFIX}
+               [[ ${EAPI} != 6 ]] && prefix=${ESYSROOT}
+               local llvm_path=${prefix}/usr/lib/llvm/${LLVM_SLOT}/bin
                local IFS=:
                local split_path=( ${PATH} )
                local new_path=()
-- 
2.38.1


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