toolchain-funcs.eclass: softfloat detection, bug #666896

commit 921cb9c10de4d237924a61a1c27f914dfb479a64
"toolchain-funcs.eclass: Update tc-is-softfloat for new ARM tuples"
changed autodetection of mst 'arm*' targets from from 'no'
to 'yes'.

It is incorrect at least for bare-metal targets that tend
to pass their taget defaults.

Bug #666896 is one example example command:
    # crossdev -s1 \
        --env 'EXTRA_ECONF="--with-multilib-list=rmprofile"' \
        arm-none-eabi

rmprofile one of special cases for gcc as it explicitky does
not myx with any arch-specific options and --with-float=soft
breaks it:

    Error: You cannot use any of --with-arch/cpu/fpu/float/mode
    with --with-multilib-list=rmprofile

The immediate fix is to restore initial autodetection for bare-metal
targets.

Reported-by: Eugene Bright
Closes: https://bugs.gentoo.org/666896
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/eclass/toolchain-funcs.eclass b/eclass/toolchain-funcs.eclass
index 3fa32820151c..12ed132c48f1 100644
--- a/eclass/toolchain-funcs.eclass
+++ b/eclass/toolchain-funcs.eclass
@@ -231,6 +231,10 @@ tc-detect-is-softfloat() {
 	[[ $(tc-getTARGET_CPP) == "gcc -E" ]] && return 1
 
 	case ${CTARGET:-${CHOST}} in
+		# Avoid autodetection for bare-metal targets. bug #666896
+		*-newlib|*-elf|*-eabi)
+			return 1 ;;
+
 		# arm-unknown-linux-gnueabi is ambiguous. We used to treat it as
 		# hardfloat but we now treat it as softfloat like most everyone
 		# else. Check existing toolchains to respect existing systems.
@@ -269,6 +273,9 @@ tc-tuple-is-softfloat() {
 			echo "softfp" ;;
 		arm*-hardfloat-*|arm*eabihf)
 			echo "no" ;;
+		# bare-metal targets have their defaults. bug #666896
+		*-newlib|*-elf|*-eabi)
+			echo "no" ;;
 		arm*)
 			echo "yes" ;;
 		*)