[Bug 251150] Cannot compile zfsboot: no previous prototype for function 'main' [-Werror,-Wmissing-prototypes]

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251150

--- Comment #3 from Toomas Soome <tsoome at freebsd.org> ---
what compiler do you have? because I do not get this error:

root at freebsd-2:/usr/src/stand/i386/zfsboot # make
cc  -O2 -pipe -fno-common   -I/usr/src/stand/i386/btx/lib -nostdinc   
-I/usr/obj/usr/src/amd64.amd64/stand/libsa32 -I/usr/src/stand/libsa
-D_STANDALONE -I/usr/src/sys -Ddouble=jagged-little-pill
-Dfloat=floaty-mcfloatface -ffunction-sections -fdata-sections
-DLOADER_GELI_SUPPORT -I/usr/src/stand/libsa/geli -DLOADER_DISK_SUPPORT -m32
-ffreestanding -mno-mmx -mno-sse -mno-avx -mno-avx2 -msoft-float -march=i386
-mno-relax -I. -Iinclude -DBOOTPROG=\"zfsboot\"  -O1  -DBOOT2 
-DLOADER_GPT_SUPPORT  -DLOADER_MBR_SUPPORT  -DLOADER_ZFS_SUPPORT 
-DLOADER_UFS_SUPPORT  -DSIOPRT=0x3f8  -DSIOFMT=0x3  -DSIOSPD=9600 
-I/usr/src/stand/common  -I/usr/src/stand/i386/common 
-I/usr/src/stand/i386/libi386  -I/usr/src/stand/libsa/zfs 
-I/usr/src/sys/crypto/skein  -I/usr/src/sys/cddl/boot/zfs 
-I/usr/src/sys/contrib/openzfs/include 
-I/usr/src/sys/contrib/openzfs/include/os/freebsd/spl 
-I/usr/src/sys/contrib/openzfs/include/os/freebsd/zfs 
-I/usr/src/sys/cddl/contrib/opensolaris/common/lz4  -I/usr/src/stand/i386/boot2
 -Wall -Waggregate-return -Wbad-function-cast -Wno-cast-align 
-Wmissing-declarations -Wmissing-prototypes -Wnested-externs  -Wpointer-arith
-Wshadow -Wstrict-prototypes -Wwrite-strings -g -MD  -MF.depend.zfsboot.o
-MTzfsboot.o -std=gnu99 -Wno-format-zero-length -Wsystem-headers -Werror
-Wno-pointer-sign -Wno-empty-body -Wno-string-plus-int
-Wno-unused-const-variable -Wno-tautological-compare -Wno-unused-value
-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
-Wno-unused-local-typedef -Wno-address-of-packed-member -Wno-switch
-Wno-switch-enum -Wno-knr-promoted-parameter -Wno-parentheses  -Oz
-Qunused-arguments    -c /usr/src/stand/i386/zfsboot/zfsboot.c -o zfsboot.o
ld -m elf_i386_fbsd -static -N --gc-sections --defsym ORG=0x2000 -T
/usr/src/stand/i386/boot.ldscript -o zfsboot.out
/usr/obj/usr/src/amd64.amd64/stand/i386/btx/lib/crt0.o zfsboot.o sio.o cons.o
bcache.o devopen.o disk.o part.o zfs_cmd.o
/usr/obj/usr/src/amd64.amd64/stand/i386/libi386/libi386.a
/usr/obj/usr/src/amd64.amd64/stand/libsa32/libsa32.a
objcopy -S -O binary zfsboot.out zfsboot.bin
btxld -v -E 0x2000 -f bin -b
/usr/obj/usr/src/amd64.amd64/stand/i386/btx/btx/btx -l zfsboot.ldr  -o
zfsboot.ld -P 1 zfsboot.bin
kernel: ver=1.02 size=6b0 load=9000 entry=9010 map=16M pgctl=1:1
client: fmt=bin size=27f84 text=0 data=0 bss=0 entry=0
output: fmt=bin size=28634 text=0 data=28634 org=0 entry=0
96716 bytes available
dd status=none if=zfsboot.ld of=zfsboot2 bs=262144 conv=sync
cat zfsboot1 zfsboot2 > zfsboot
root at freebsd-2:/usr/src/stand/i386/zfsboot # cc -v
FreeBSD clang version 11.0.0 (git at github.com:llvm/llvm-project.git
llvmorg-11.0.0-rc5-0-g60a25202a7d)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin
root at freebsd-2:/usr/src/stand/i386/zfsboot #

Of course we can add this prototype, but I'd like to understand why you have
this error and I do not.

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