arm: Fix CMSE support detection in libgcc (PR target/99157)

As discussed in the PR, the Makefile fragment lacks a double '$' to
get the return-code from GCC invocation, resulting is CMSE support
missing from multilibs.

I checked that the simple patch proposed in the PR fixes the problem.

2021-02-23  Christophe Lyon  <christophe.lyon@linaro.org>
	    Hau Hsu  <hsuhau617@gmail.com>

	PR target/99157
	libgcc/
	* config/arm/t-arm: Fix cmse support detection.

diff --git a/libgcc/config/arm/t-arm b/libgcc/config/arm/t-arm
index 364f40e..3625a25 100644 (file)
--- a/libgcc/config/arm/t-arm
+++ b/libgcc/config/arm/t-arm
@@ -4,7 +4,7 @@ LIB1ASMFUNCS = _thumb1_case_sqi _thumb1_case_uqi _thumb1_case_shi \
 
 HAVE_CMSE:=$(findstring __ARM_FEATURE_CMSE,$(shell $(gcc_compile_bare) -dM -E - </dev/null))
 HAVE_V81M:=$(findstring armv8.1-m.main,$(gcc_compile_bare))
-ifeq ($(shell $(gcc_compile_bare) -E -mcmse - </dev/null >/dev/null 2>/dev/null; echo $?),0)
+ifeq ($(shell $(gcc_compile_bare) -E -mcmse - </dev/null >/dev/null 2>/dev/null; echo $$?),0)
 CMSE_OPTS:=-mcmse
 endif