Eliminate LDFLAGS hack to compile on certain OSs

Instead, we now link to the libm system math library where needed
by adding -lm to the relevant compile commands in the Mamfiles.
This is not needed on every system but never does any harm.

(This adds more custom edits to the Mamfiles, which were originally
generated from the nmake Makefiles. This takes us further from
restoring nmake, but that already wasn't going to happen anyway,
due to its many problems... the path forward will be to translate
the Mamfiles to some other, current make system such as GNU make.)

bin/package, src/cmd/INIT/package.sh:
- Remove LDFLAGS=-lm hack for DragonFly BSD, NetBSD and Solaris.

src/cmd/builtin/Mamfile,
src/cmd/ksh93/Mamfile,
src/lib/libdll/Mamfile:
- Add -lm where linking failed on any of the three mentioned OSs.

src/lib/libdll/features/dll:
- In the output test program, add missing #include <math.h>, fixing
  unknown identifier errors on NetBSD (ldexp, ldexpl).

src/cmd/builtin/features/pty:
- Add missing #include <stdio.h> to make printf work on all systems
  (this is just a feature test, no need to bother with sfio here).

src/lib/libast/features/stdio:
- Undef __FILE_T to avoid interference from system headers on QNX.
  (There are still other problems preventing a build on QNX 6.5.0.
  The shipped version of gcc seems to be broken.)

bin/package

@@ -1405,19 +1405,6 @@ case $ksh_relflags in
 	assign="${assign:+$assign }KSH_RELFLAGS=\"\$ksh_relflags\"" ;;
 esac
 
-# Hack to build on some systems that need an explicit link with libm due to a bug in the build system
-case `uname` in
-NetBSD | SunOS | DragonFly)
-	case " $LDFLAGS " in
-	*" -m "*)
-		;;
-	*)	LDFLAGS="-lm${LDFLAGS:+ $LDFLAGS}"
-		export LDFLAGS
-		;;
-	esac
-	;;
-esac
-
 # grab action specific args
 
 case $action in

src/cmd/INIT/package.sh

@@ -1404,19 +1404,6 @@ case $ksh_relflags in
 	assign="${assign:+$assign }KSH_RELFLAGS=\"\$ksh_relflags\"" ;;
 esac
 
-# Hack to build on some systems that need an explicit link with libm due to a bug in the build system
-case `uname` in
-NetBSD | SunOS | DragonFly)
-	case " $LDFLAGS " in
-	*" -m "*)
-		;;
-	*)	LDFLAGS="-lm${LDFLAGS:+ $LDFLAGS}"
-		export LDFLAGS
-		;;
-	esac
-	;;
-esac
-
 # grab action specific args
 
 case $action in

src/cmd/builtin/Mamfile

@@ -56,7 +56,7 @@ make FEATURE/pty implicit
 meta FEATURE/pty features/%>FEATURE/% features/pty pty
 make features/pty
 done features/pty
-exec - iffe -v -c '${CC} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS}   ${LDFLAGS} ' ref ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libast} ${mam_libcmd} : run features/pty
+exec - iffe -v -c '${CC} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS} ${LDFLAGS} -lm' ref ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libast} ${mam_libcmd} : run features/pty
 done FEATURE/pty generated
 make ${PACKAGE_ast_INCLUDE}/ast_time.h implicit
 done ${PACKAGE_ast_INCLUDE}/ast_time.h
@@ -77,7 +77,7 @@ exec - ${CC} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS} -I. -I${PACKAGE_ast_INCL
 done pty.o generated
 bind -lutil dontcare
 setv CMD_STANDALONE -DCMD_STANDALONE="b_pty"
-exec - ${CC} ${CCLDFLAGS} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS} ${LDFLAGS} ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -o pty pty.o ${mam_libutil} ${mam_libast} ${mam_libcmd}
+exec - ${CC} ${CCLDFLAGS} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS} ${LDFLAGS} -lm ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -o pty pty.o ${mam_libutil} ${mam_libast} ${mam_libcmd}
 done pty generated
 make ${INSTALLROOT}/bin
 exec - if silent test ! -d ${INSTALLROOT}/bin

src/cmd/builtin/features/pty

@@ -13,6 +13,7 @@ lib	openpty,_getpty,ptsname -lutil
 lib	grantpt,unlockpt,posix_openpt stdlib.h
 
 tst - output{
+	#include	<stdio.h>
 	#include	<sys/types.h>
 	#include	<sys/stat.h>
 	#if _lib_ptsname && _npt_ptsname

src/cmd/ksh93/Mamfile

@@ -1364,7 +1364,7 @@ prev +li
 prev ${mam_libsocket}
 prev ${mam_libsecdb}
 setv CC.DLL -UCC.DLL
-exec - ${CC} ${CCLDFLAGS} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS} ${LDFLAGS} ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -o suid_exec suid_exec.o ${mam_libast} ${mam_libnsl} ${mam_libast}
+exec - ${CC} ${CCLDFLAGS} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS} ${LDFLAGS} -lm ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -o suid_exec suid_exec.o ${mam_libast} ${mam_libnsl} ${mam_libast}
 done suid_exec generated
 make shell
 prev libshell.a archive

src/lib/libast/features/stdio

@@ -15,6 +15,7 @@ cat{
 
 	#undef	FILE
 	#undef	_FILE
+	#undef	__FILE_T
 	#undef	fpos_t
 	#undef	fpos64_t
 

src/lib/libdll/Mamfile

@@ -170,7 +170,7 @@ make features/dll
 done features/dll
 bind -ldl dontcare
 bind -last
-exec - iffe -v -c '${CC} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS}   ${LDFLAGS} ' ref ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libdl} ${mam_libast} : run features/dll
+exec - iffe -v -c '${CC} ${mam_cc_FLAGS} ${KSH_RELFLAGS} ${CCFLAGS} ${LDFLAGS} -lm' ref ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libdl} ${mam_libast} : run features/dll
 done FEATURE/dll generated
 exec - cmp 2>/dev/null -s FEATURE/dll dlldefs.h || { rm -f dlldefs.h; silent test -d . || mkdir .; cp FEATURE/dll dlldefs.h; }
 done dlldefs.h generated

src/lib/libdll/features/dll

@@ -75,6 +75,7 @@ tst	run{
 	echo "#define _DLL_NEXT_PATH	\"$lib\""
 }end
 tst	- output{
+	#include <math.h>
 	#if defined(__MVS__) && !defined(__SUSV3)
 	#define __SUSV3		1
 	#endif