Fix build of stand with base gcc

* Make autoboot() a static function in stand/common/boot.c, so it does
  not shadow local variables in gptboot.c and zfsboot.c.
* Remove -Winline from the Makefiles for gptboot, gptzfsboot and
  zfsboot, as gcc will always fail to inline some functions, and there
  is nothing we can do about it.
* For gcc <= 4.2.1, silence -Wuninitialized for isoboot, as it produces
  a false positive warning.
* Remove deprecated and unnecessary -mcpu=i386 flag from stand/defs.mk,
  as there is already a -march=i386 flag further in the file.

Reviewed by:	imp
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D15628

stand/common/boot.c

@@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
 
 #include "bootstrap.h"
 
+static int	autoboot(int timeout, char *prompt);
 static char	*getbootfile(int try);
 static int	loadakernel(int try, int argc, char* argv[]);
 
@@ -157,7 +158,7 @@ autoboot_maybe()
 		autoboot(-1, NULL);		/* try to boot automatically */
 }
 
-int
+static int
 autoboot(int timeout, char *prompt)
 {
 	time_t	when, otime, ntime;

stand/common/bootstrap.h

@@ -61,7 +61,6 @@ char	*backslash(const char *str);
 int	parse(int *argc, char ***argv, const char *str);
 
 /* boot.c */
-int	autoboot(int timeout, char *prompt);
 void	autoboot_maybe(void);
 int	getrootmount(char *rootdev);
 

stand/defs.mk

@@ -91,7 +91,7 @@ CFLAGS+=	-m32 -mcpu=powerpc
 # build 32-bit and some 64-bit (lib*, efi). Centralize all the 32-bit magic here
 # and activate it when DO32 is explicitly defined to be 1.
 .if ${MACHINE_ARCH} == "amd64" && ${DO32:U0} == 1
-CFLAGS+=	-m32 -mcpu=i386
+CFLAGS+=	-m32
 # LD_FLAGS is passed directly to ${LD}, not via ${CC}:
 LD_FLAGS+=	-m elf_i386_fbsd
 AFLAGS+=	--32

stand/i386/gptboot/Makefile

@@ -37,7 +37,7 @@ CFLAGS+=-DBOOTPROG=\"gptboot\" \
 	-Wall -Waggregate-return -Wbad-function-cast -Wno-cast-align \
 	-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
 	-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings \
-	-Winline -Wno-pointer-sign
+	-Wno-pointer-sign
 
 CFLAGS.gcc+=	--param max-inline-insns-single=100
 

stand/i386/gptzfsboot/Makefile

@@ -37,7 +37,7 @@ CFLAGS+=-DBOOTPROG=\"gptzfsboot\" \
 	-Wall -Waggregate-return -Wbad-function-cast \
 	-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
 	-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings \
-	-Winline -Wno-pointer-sign
+	-Wno-pointer-sign
 
 CFLAGS.clang+=	-Wno-tentative-definition-incomplete-type
 

stand/i386/isoboot/Makefile

@@ -36,6 +36,9 @@ CFLAGS+=-DBOOTPROG=\"isoboot\" \
 	-Winline -Wno-pointer-sign
 
 CFLAGS.gcc+=	--param max-inline-insns-single=100
+.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} <= 40201
+CFLAGS.gcc+=	-Wno-uninitialized
+.endif
 CFLAGS.clang+=  -Oz ${CLANG_OPT_SMALL}
 
 LD_FLAGS+=${LD_FLAGS_BIN}

stand/i386/zfsboot/Makefile

@@ -34,8 +34,7 @@ CFLAGS+=-DBOOTPROG=\"zfsboot\" \
 	-I${BOOTSRC}/i386/boot2 \
 	-Wall -Waggregate-return -Wbad-function-cast -Wno-cast-align \
 	-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
-	-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings \
-	-Winline
+	-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings
 
 CFLAGS.gcc+=	--param max-inline-insns-single=100
 .if ${MACHINE} == "amd64"