Implement sqrtf() as a wrapper around sqrt(), for simplicity.

src/cmd/awk/run.c

@@ -810,7 +810,7 @@ obj fncn(a,n) node **a;
 	else if (t == FEXP)
 		u = exp(getfval(x.optr));
 	else if (t == FSQRT)
-		u = 0 /* TODO: sqrt(getfval(x.optr))*/;
+		u = sqrt(getfval(x.optr));
 	else
 		error(FATAL, "illegal function type %d", t);
 	tempfree(x);

src/cmd/fold/fold.c

@@ -36,9 +36,13 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #define	DEFLINEWIDTH	80
 
+void fold(int width);
+
+int
 main(argc, argv)
 	int argc;
 	char **argv;
@@ -91,6 +95,7 @@ main(argc, argv)
 	exit(0);
 }
 
+void
 fold(width)
 	register int width;
 {

src/libm/sqrt.c

@@ -51,3 +51,8 @@ sqrt(arg)
 		temp = 0.5*(temp + arg/temp);
 	return(temp);
 }
+
+float sqrtf(float arg)
+{
+        return sqrt(arg);
+}

target.mk

@@ -38,10 +38,10 @@ ifeq ($(LLVMBIN),)
     $(error Unable to find any CLANG toolchain!)
 endif
 
-CC		= $(LLVMBIN)clang -target mipsel -mcpu=mips32r2 -mabi=o32 -mfloat-abi=soft \
+CC		= $(LLVMBIN)clang -target mipsel -mcpu=mips32r2 -mabi=o32 -msoft-float \
                   -fomit-frame-pointer -finline-hint-functions -I$(TOPSRC)/include \
                   -Wno-builtin-requires-header
-CXX             = $(LLVMBIN)clang++ -target mipsel -mcpu=mips32r2 -mabi=o32 -mfloat-abi=soft \
+CXX             = $(LLVMBIN)clang++ -target mipsel -mcpu=mips32r2 -mabi=o32 -msoft-float \
                   -fomit-frame-pointer -finline-hint-functions -I$(TOPSRC)/include
 LD		= $(LLVMBIN)ld.lld -m elf32ltsmip
 AR		= $(LLVMBIN)llvm-ar