Add internal floating point environment builtins to libcompiler_rt and

libgcc, as these are used in a few other builtin implementations.

lib/libcompiler_rt/Makefile.inc

@@ -143,6 +143,14 @@ SRCF+=		floatundixf
 SRCF+=		cpu_model
 .endif
 
+# The fp_mode implementation for amd64 and i386 is shared, while other
+# architectures use the regular approach.
+.if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386"
+SRCS+=		i386/fp_mode.c
+.else
+SRCF+=		fp_mode
+.endif
+
 #
 # 128-bit quad precision long double support,
 # only used on some architectures.
@@ -205,14 +213,12 @@ CFLAGS+=	-DEMIT_SYNC_ATOMICS
 SRCF+=		stdatomic
 .endif
 
-
 .if "${COMPILER_TYPE}" == "clang" && \
     (${MACHINE_ARCH} == "powerpc" || ${MACHINE_ARCH} == "powerpcspe")
 SRCS+=          atomic.c
 CFLAGS.atomic.c+=      -Wno-atomic-alignment
 .endif
 
-
 .for file in ${SRCF}
 .if ${MACHINE_ARCH:Marmv[67]*} && (!defined(CPUTYPE) || ${CPUTYPE:M*soft*} == "") \
     && exists(${CRTSRC}/${CRTARCH}/${file}vfp.S)