toolchain.eclass: fix arch downgrade for gcc-10

The bug is in lexical comparison instead of version compare.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

2 files changed, 20 insertions, 9 deletions

diff --git a/eclass/tests/toolchain.sh b/eclass/tests/toolchain.sh
index 56609aa180e4..1d05f6c126ba 100755
--- a/eclass/tests/toolchain.sh
+++ b/eclass/tests/toolchain.sh
@@ -12,6 +12,12 @@ source tests-common.sh
 
 inherit toolchain
 
+# Ignore actually running version of gcc and fake new version
+# to force downgrade test on all conditions below.
+gcc-version() {
+	echo "99.99"
+}
+
 test_downgrade_arch_flags() {
 	local exp msg ret=0 ver
 
@@ -26,13 +32,14 @@ test_downgrade_arch_flags() {
 	downgrade_arch_flags ${ver}
 
 	if [[ ${CFLAGS} != ${exp} ]]; then
-		msg="Failure - Expected: \"${exp}\" Got: \"${CFLAGS}\""
+		msg="Failure - Expected: \"${exp}\" Got: \"${CFLAGS}\" Ver: ${ver}"
 		ret=1
 	fi
 	tend ${ret} ${msg}
 }
 
 #                         ver  expected            given
+test_downgrade_arch_flags 10  "-march=haswell"    "-march=haswell"
 test_downgrade_arch_flags 4.9 "-march=haswell"    "-march=haswell"
 test_downgrade_arch_flags 4.8 "-march=core-avx2"  "-march=haswell"
 test_downgrade_arch_flags 4.7 "-march=core-avx2"  "-march=haswell"
@@ -64,6 +71,7 @@ test_downgrade_arch_flags 3.3 "-march=c3"         "-march=c3-2"
 
 test_downgrade_arch_flags 4.5 "-march=garbage"    "-march=garbage"
 
+test_downgrade_arch_flags 10  "-mtune=intel"      "-mtune=intel"
 test_downgrade_arch_flags 4.9 "-mtune=intel"      "-mtune=intel"
 test_downgrade_arch_flags 4.8 "-mtune=generic"    "-mtune=intel"
 test_downgrade_arch_flags 3.4 ""                  "-mtune=generic"
@@ -74,9 +82,11 @@ test_downgrade_arch_flags 4.5 "-march=amdfam10 -mtune=generic" "-march=btver2 -m
 test_downgrade_arch_flags 3.3 "-march=k6-2"       "-march=geode -mtune=barcelona"
 test_downgrade_arch_flags 3.4 "-march=k8"         "-march=btver2 -mtune=generic"
 
+test_downgrade_arch_flags 10  "-march=native"     "-march=native"
 test_downgrade_arch_flags 4.2 "-march=native"     "-march=native"
 test_downgrade_arch_flags 4.1 "-march=nocona"     "-march=native"
 
+test_downgrade_arch_flags 10  "-march=foo -mno-sha -mno-rtm -mno-avx2 -mno-avx -mno-sse4.1" "-march=foo -mno-sha -mno-rtm -mno-avx2 -mno-avx -mno-sse4.1"
 test_downgrade_arch_flags 4.9 "-march=foo -mno-sha -mno-rtm -mno-avx2 -mno-avx -mno-sse4.1" "-march=foo -mno-sha -mno-rtm -mno-avx2 -mno-avx -mno-sse4.1"
 test_downgrade_arch_flags 4.8 "-march=foo -mno-rtm -mno-avx2 -mno-avx -mno-sse4.1" "-march=foo -mno-sha -mno-rtm -mno-avx2 -mno-avx -mno-sse4.1"
 test_downgrade_arch_flags 4.7 "-march=foo -mno-avx2 -mno-avx -mno-sse4.1" "-march=foo -mno-sha -mno-rtm -mno-avx2 -mno-avx -mno-sse4.1"
diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index 5f9bd7750dda..bd3d024f9891 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -1406,7 +1406,8 @@ downgrade_arch_flags() {
 	local arch bver i isa myarch mytune rep ver
 
 	bver=${1:-${GCC_BRANCH_VER}}
-	[[ $(gcc-version) < ${bver} ]] && return 0
+	# Don't perform downgrade if running gcc is older than ebuild's.
+	tc_version_is_at_least ${bver} $(gcc-version) || return 0
 	[[ $(tc-arch) != amd64 && $(tc-arch) != x86 ]] && return 0
 
 	myarch=$(get-flag march)
@@ -1414,7 +1415,7 @@ downgrade_arch_flags() {
 
 	# If -march=native isn't supported we have to tease out the actual arch
 	if [[ ${myarch} == native || ${mytune} == native ]] ; then
-		if [[ ${bver} < 4.2 ]] ; then
+		if ! tc_version_is_at_least 4.2 ${bver}; then
 			arch=$($(tc-getCC) -march=native -v -E -P - </dev/null 2>&1 \
 				| sed -rn "/cc1.*-march/s:.*-march=([^ ']*).*:\1:p")
 			replace-cpu-flags native ${arch}
@@ -1422,10 +1423,10 @@ downgrade_arch_flags() {
 	fi
 
 	# Handle special -mtune flags
-	[[ ${mytune} == intel && ${bver} < 4.9 ]] && replace-cpu-flags intel generic
-	[[ ${mytune} == generic && ${bver} < 4.2 ]] && filter-flags '-mtune=*'
+	[[ ${mytune} == intel ]] && ! tc_version_is_at_least 4.9 ${bver} && replace-cpu-flags intel generic
+	[[ ${mytune} == generic ]] && ! tc_version_is_at_least 4.2 ${bver} && filter-flags '-mtune=*'
 	[[ ${mytune} == x86-64 ]] && filter-flags '-mtune=*'
-	[[ ${bver} < 3.4 ]] && filter-flags '-mtune=*'
+	tc_version_is_at_least 3.4 ${bver} || filter-flags '-mtune=*'
 
 	# "added" "arch" "replacement"
 	local archlist=(
@@ -1475,8 +1476,8 @@ downgrade_arch_flags() {
 
 		[[ ${myarch} != ${arch} && ${mytune} != ${arch} ]] && continue
 
-		if [[ ${ver} > ${bver} ]] ; then
-			einfo "Replacing ${myarch} (added in gcc ${ver}) with ${rep}..."
+		if ! tc_version_is_at_least ${ver} ${bver}; then
+			einfo "Downgrading '${myarch}' (added in gcc ${ver}) with '${rep}'..."
 			[[ ${myarch} == ${arch} ]] && replace-cpu-flags ${myarch} ${rep}
 			[[ ${mytune} == ${arch} ]] && replace-cpu-flags ${mytune} ${rep}
 			continue
@@ -1524,7 +1525,7 @@ downgrade_arch_flags() {
 	for ((i = 0; i < ${#isalist[@]}; i += 2)) ; do
 		ver=${isalist[i]}
 		isa=${isalist[i + 1]}
-		[[ ${ver} > ${bver} ]] && filter-flags ${isa} ${isa/-m/-mno-}
+		tc_version_is_at_least ${ver} ${bver} || filter-flags ${isa} ${isa/-m/-mno-}
 	done
 }