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|
#!/bin/sh
fail() {
echo "$0: $*" >&2
exit 1
}
host=
target=
gcclibdir=
for arg ; do
case "$arg" in
--host=*) host=${arg#*=} ;;
--target=*) target=${arg#*=} ;;
--with-cpp=*) DEFAULT_PREPROCESSOR=${arg#*=} ;;
--with-qbe=*) DEFAULT_QBE=${arg#*=} ;;
--with-as=*) DEFAULT_ASSEMBLER=${arg#*=} ;;
--with-ld=*) DEFAULT_LINKER=${arg#*=} ;;
--with-ldso=*) DEFAULT_DYNAMIC_LINKER=${arg#*=} ;;
--with-gcc-libdir=*) gcclibdir=${arg#*=} ;;
CC=*) CC=${arg#*=} ;;
CFLAGS=*) CFLAGS=${arg#*=} ;;
LDFLAGS=*) LDFLAGS=${arg#*=} ;;
*) fail "unknown option '$arg'"
esac
done
: ${CC:=cc}
printf 'checking host system type... '
test -n "$host" || host=$($CC -dumpmachine 2>/dev/null) || fail "could not determine host"
printf '%s\n' "$host"
printf 'checking target system type... '
test -n "$target" || target=$host
printf '%s\n' "$target"
toolprefix=
if [ "$host" != "$target" ] ; then
toolprefix=$target-
fi
: ${DEFAULT_PREPROCESSOR:=${toolprefix}cpp}
: ${DEFAULT_QBE:=qbe}
: ${DEFAULT_ASSEMBLER:=${toolprefix}as}
: ${DEFAULT_LINKER:=${toolprefix}ld}
case "$target" in
x86_64*|amd64*) qbetarget=amd64_sysv ;;
aarch64*) qbetarget=arm64 ;;
*) fail "unsupported architecture '${target%%-*}'"
esac
gnuc='
/* specify the GNU C extensions we support */
"-D", "__GNUC__=1",
"-D", "__GNUC_MINOR__=0",
'
case "$target" in
*-linux-*musl*)
test "$DEFAULT_DYNAMIC_LINKER" || case "$target" in
x86_64*) DEFAULT_DYNAMIC_LINKER=/lib/ld-musl-x86_64.so.1 ;;
aarch64*) DEFAULT_DYNAMIC_LINKER=/lib/ld-musl-aarch64.so.1 ;;
*) fail "unsuported target '$target'"
esac
startfiles='"-l", ":crt1.o", "-l", ":crti.o"'
endfiles='"-l", "c", "-l", ":crtn.o"'
;;
*-linux-*gnu*)
test "$DEFAULT_DYNAMIC_LINKER" || case "$target" in
x86_64*) DEFAULT_DYNAMIC_LINKER=/lib64/ld-linux-x86-64.so.2 ;;
aarch64*) DEFAULT_DYNAMIC_LINKER=/lib/ld-linux-aarch64.so.1 ;;
*) fail "unsuported target '$target'"
esac
startfiles='"-l", ":crt1.o", "-l", ":crti.o", "-l", ":crtbegin.o"'
endfiles='"-l", "c", "-l", ":crtend.o", "-l", ":crtn.o"'
if [ -z "$gcclibdir" ] ; then
test "$host" = "$target" || fail "gcc libdir must be specified when building a cross-compiler"
crtbegin=$($CC -print-file-name=crtbegin.o 2>/dev/null)
gcclibdir=${crtbegin%/*}
fi
linkflags='"-L", "'$gcclibdir'"',
defines='
/* prevent glibc from using statement expressions for assert */
"-D", "__STRICT_ANSI__",
'
;;
*-*freebsd*)
: ${DEFAULT_DYNAMIC_LINKER:=/libexec/ld-elf.so.1}
startfiles='"-l", ":crt1.o", "-l", ":crti.o"'
endfiles='"-l", "c", "-l", ":crtn.o"'
# any value of __GNUC__ will cause FreeBSD's headers to use asm for bswap
gnuc=
linkflags='"-L", "/usr/lib"',
defines='
"-D", "_Pragma(x)=",
"-D", "_Nullable=",
"-D", "_Nonnull=",
"-D", "__GNUCLIKE_BUILTIN_STDARG",
"-D", "__GNUCLIKE_BUILTIN_VARARGS",
/* required to define _RuneLocale, needed by xlocale/_ctype.h */
"-D", "_USE_CTYPE_INLINE_",
/* workaround for #42 */
"-D", "_XLOCALE_INLINE=static inline",
/* used like attribute after declarator, so _Alignas will not work here */
"-D", "__aligned(x)=",
/* TLS is not yet supported (#8) */
"-D", "__NO_TLS",
/* disable warnings for redefining _Pragma */
"-Wno-builtin-macro-redefined",
'
;;
*)
fail "unknown target '$target', please create config.h manually"
esac
printf "creating config.h... "
cat >config.h <<EOF
static char *startfiles[] = {$startfiles};
static char *endfiles[] = {$endfiles};
static char *preprocesscmd[] = {
"$DEFAULT_PREPROCESSOR", "-P", "-std=c11",
/* clear preprocessor GNU C version */
"-U", "__GNUC__",
"-U", "__GNUC_MINOR__",
/* we don't yet support these optional features */
"-D", "__STDC_NO_ATOMICS__",
"-D", "__STDC_NO_COMPLEX__",
"-D", "__STDC_NO_VLA__",
/* ignore attributes and extension markers */
"-D", "__attribute__(x)=",
"-D", "__extension__=",
/* alternate keywords */
"-D", "__alignof__=_Alignof",
"-D", "__inline=inline",
"-D", "__inline__=inline",
"-D", "__signed__=signed",
"-D", "__thread=_Thread_local",
"-D", "__volatile__=volatile",
$gnuc$defines};
static char *codegencmd[] = {"$DEFAULT_QBE", "-t", "$qbetarget"};
static char *assemblecmd[] = {"$DEFAULT_ASSEMBLER"};
static char *linkcmd[] = {"$DEFAULT_LINKER", "--dynamic-linker", "$DEFAULT_DYNAMIC_LINKER", $linkflags};
EOF
echo done
printf "creating config.mk... "
cat >config.mk <<EOF
CC=${CC:-cc}
CFLAGS=${CFLAGS:--std=c11 -Wall -Wno-parentheses -Wno-switch -g -pipe}
LDFLAGS=$LDFLAGS
EOF
echo done
|
