mk: remove gcc/gnat matching logic (obsolete)

coreboot has this now:

commit c421847fe2fef61586eb313206a4be0f2e491974
Author: Matt DeVillier <matt.devillier@gmail.com>
Date:   Mon Dec 29 10:12:17 2025 -0600

    util/crossgcc: Fix GNAT detection for gnat-15

this one is advisory instead, telling the user to
create such a symlink as we did. this is much less
invasive.

our own check was bad, because it basically silences
what is otherwise an error. coreboot's approach is
more correct, so we will defer to that instead.

note that this means older coreboot (for fam15h) is
no longer covered, but those trees don't use gnat
anyway as libgfxinit is unused on those targets

this lbmk patch removes 61 sloc of dead code, which
makes me very happy.

Signed-off-by: Leah Rowe <leah@libreboot.org>

2 files changed, 5 insertions, 95 deletions

diff --git a/include/env/init.sh b/include/env/init.sh
index 523d01de..0003d098 100644
--- a/include/env/init.sh
+++ b/include/env/init.sh
@@ -171,7 +171,7 @@ xbmk_parent_set_env()
 	xbmk_parent_set_export
 	xbmk_set_version
 
-	remkdir "$xbtmp" "$xbtmp/gnupath" "$xbtmp/xbmkpath"
+	remkdir "$xbtmp" "$xbtmp/xbmkpath"
 
 	xbmk_set_pyver
 	xbmk_set_mirror
@@ -216,7 +216,7 @@ xbmk_parent_set_export()
 		err "cachedir '$XBMK_CACHE' is a file" \
 		    "xbmk_parent_set_export" "$@"
 
-	export PATH="$xbtmp/xbmkpath:$xbtmp/gnupath:$PATH"
+	export PATH="$xbtmp/xbmkpath:$PATH"
 	xbmkpath="$PATH"
 
 	# if "y": a coreboot target won't be built if target.cfg says release=n
diff --git a/mk b/mk
index 1010829e..86157469 100755
--- a/mk
+++ b/mk
@@ -53,9 +53,9 @@ if_not_dry_build=""
 
 eval "`newvar autoconfargs autogenargs badhash badtghash bootstrapargs \
     build_depend buildtype cleanargs cmakedir cmd defconfig dest_dir elfdir \
-    forcepull gccdir gccfull gccver gnatdir gnatfull gnatver listfile \
-    makeargs mdir mkhelper mkhelpercfg mode postmake premake project release \
-    rev srcdir target target_dir tree xarch xgcctree xlang`"
+    forcepull listfile makeargs mdir mkhelper mkhelpercfg mode postmake \
+    premake project release rev srcdir target target_dir tree xarch xgcctree \
+    xlang`"
 
 main()
 {
@@ -433,102 +433,12 @@ check_cross_compiler()
 	[ -f "$xgccfile" ] && \
 		return 0 # build exists already, so skip building
 
-	check_gnu_path gcc gnat || x_ check_gnu_path gnat gcc
 	make -C "$cbdir" $xgccargs || x_ make -C "$cbdir" $xgccargs
 
 	x_ touch "$xgccfile" # prevent unnecessary re-build operations
 	remkdir "$xbtmp/gnupath" # reset hostcc
 }
 
-# fix mismatching gcc/gnat versions on debian trixie/sid. as of december 2024,
-# trixie/sid had gnat-13 as gnat and gcc-14 as gcc, but has gnat-14 in apt. in
-# some cases, gcc 13+14 and gnat-13 are present; or gnat-14 and gcc-14, but
-# gnat in PATH never resolves to gnat-14, because gnat-14 was "experimental"
-
-check_gnu_path()
-{
-	command -v "$1" 1>/dev/null || \
-		err "Host '$1' unavailable" "check_gnu_path" "$@"
-
-	eval "`newvar gccdir gccfull gccver gnatdir gnatfull gnatver`"
-
-	if host_gcc_gnat_match "$@"; then
-		return 0
-	elif ! match_gcc_gnat_versions "$@"; then
-		return 1
-	fi
-}
-
-# check if gcc/gnat versions already match:
-
-host_gcc_gnat_match()
-{
-	gnu_setver "$1" "$1" || \
-		err "Command '$1' unavailable." "check_gnu_path" "$@"
-	gnu_setver "$2" "$2" || :
-
-	eval "[ -z \"\$$1ver\" ] && err \"Cannot detect host '$1' version\""
-
-	[ "$gnatfull" != "$gccfull" ] && \
-		return 1; : # mismatched gcc/gnat versions
-}
-
-# find all gcc/gnat versions, matching them up in PATH:
-
-match_gcc_gnat_versions()
-{
-	eval "$1dir=\"$(dirname "$(command -v "$1")")\""
-	eval "_gnudir=\"\$$1dir\""
-	eval "_gnuver=\"\$$1ver\""
-
-	for _bin in "$_gnudir/$2-"*; do
-		if [ "${_bin#"$_gnudir/$2-"}" = "$_gnuver" ] && [ -x "$_bin" ]
-		then
-			_gnuver="${_bin#"$_gnudir/$2-"}"
-			break
-		fi
-	done
-
-	gnu_setver "$2" "$_gnudir/$2-$_gnuver" || \
-		return 1
-	[ "$gnatfull" != "$gccfull" ] && \
-		return 1
-
-	( link_gcc_gnat_versions "$@" "$_gnudir" "$_gnuver" ) || \
-	    err "Can't link '$2-$_gnuver' '$_gnudir'" "check_gnu_path" "$@"; :
-}
-
-# create symlinks in PATH, so that the GCC/GNAT versions match:
-
-link_gcc_gnat_versions()
-{
-	_gnudir="$3"
-	_gnuver="$4"
-
-	remkdir "$xbtmp/gnupath"
-
-	x_ cd "$xbtmp/gnupath"
-
-	for _gnubin in "$_gnudir/$2"*"-$_gnuver"
-	do
-		_gnuutil="${_gnubin##*/}"
-		[ -e "$_gnubin" ] && \
-			x_ ln -s "$_gnubin" "${_gnuutil%"-$_gnuver"}"; :
-	done
-}
-
-# get the gcc/gnat version
-# fail: return 1 if util not found
-gnu_setver()
-{
-	eval "$2 --version 1>/dev/null 2>/dev/null || return 1"
-
-	eval "$1ver=\"`"$2" --version 2>/dev/null | head -n1`\""
-	eval "$1ver=\"\${$1ver##* }\""
-	eval "$1full=\"\$$1ver\""
-	eval "$1ver=\"\${$1ver%%.*}\""; :
-}
-
 check_defconfig()
 {
 	[ ! -f "$defconfig" ] && \