diff --git a/libatomic/testsuite/Makefile.am b/libatomic/testsuite/Makefile.am
index a9a0144185a..a19101aac54 100644
--- a/libatomic/testsuite/Makefile.am
+++ b/libatomic/testsuite/Makefile.am
@@ -11,3 +11,9 @@ EXPECT = $(shell if test -f $(top_builddir)/../expect/expect; then \
 _RUNTEST = $(shell if test -f $(top_srcdir)/../dejagnu/runtest; then \
 	     echo $(top_srcdir)/../dejagnu/runtest; else echo runtest; fi)
 RUNTEST = "$(_RUNTEST) $(AM_RUNTESTFLAGS)"
+
+EXTRA_DEJAGNU_SITE_CONFIG = extra.exp
+
+extra.exp:
+	echo 'set BUILD_CC "$(CC)"' > $@.tmp
+	mv $@.tmp $@
diff --git a/libatomic/testsuite/Makefile.in b/libatomic/testsuite/Makefile.in
index 0a7ac4b4dc7..704db219fa3 100644
--- a/libatomic/testsuite/Makefile.in
+++ b/libatomic/testsuite/Makefile.in
@@ -226,6 +226,7 @@ _RUNTEST = $(shell if test -f $(top_srcdir)/../dejagnu/runtest; then \
 	     echo $(top_srcdir)/../dejagnu/runtest; else echo runtest; fi)
 
 RUNTEST = "$(_RUNTEST) $(AM_RUNTESTFLAGS)"
+EXTRA_DEJAGNU_SITE_CONFIG = extra.exp
 all: all-am
 
 .SUFFIXES:
@@ -432,6 +433,10 @@ uninstall-am:
 	uninstall uninstall-am
 
 
+extra.exp:
+	echo 'set BUILD_CC "$(CC)"' > $@.tmp
+	mv $@.tmp $@
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT:
diff --git a/libatomic/testsuite/lib/libatomic.exp b/libatomic/testsuite/lib/libatomic.exp
index 0a53f9e11f1..51b35919f2d 100644
--- a/libatomic/testsuite/lib/libatomic.exp
+++ b/libatomic/testsuite/lib/libatomic.exp
@@ -75,6 +75,7 @@ proc libatomic_init { args } {
     global ALWAYS_CFLAGS
     global CFLAGS
     global TOOL_EXECUTABLE TOOL_OPTIONS
+    global BUILD_CC
     global GCC_UNDER_TEST
     global TESTING_IN_BUILD_TREE
     global target_triplet
@@ -90,6 +91,8 @@ proc libatomic_init { args } {
     if ![info exists GCC_UNDER_TEST] then {
 	if [info exists TOOL_EXECUTABLE] {
 	    set GCC_UNDER_TEST $TOOL_EXECUTABLE
+	} elseif [info exists BUILD_CC] {
+	    set GCC_UNDER_TEST $BUILD_CC
 	} else {
 	    set GCC_UNDER_TEST "[find_gcc]"
 	}