83 lines
2.0 KiB
Bash
Executable File
83 lines
2.0 KiB
Bash
Executable File
#!/bin/sh
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# many parts of this blatantly ripped from GNU Autoconf macros
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# Use this for cross-compiling, as we can't run cross-compiled binaries
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# on our host.
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if test -z "$O" || ! cd "$O"; then
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echo '$O= not defined or not a directory' >&2
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exit 1
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fi
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echo '/* architecture-specific settings (auto-detected): */'
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# check sizes of various types we care for
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# this is slightly slower but much easier to read and follow than the
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# bisecting autoconf version
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for t in short int long 'long long'; do
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> out
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for s in 2 4 6 8 12 1 16 24 32 0; do
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cat > t.c <<EOF
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int main(void)
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{
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static int x[(long int)(sizeof($t)) == $s ? 1 : -1];
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x[0] = 0;
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return 0;
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}
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EOF
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echo "trying sizeof($t) == $s" >> out
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$CC -o t.o $CFLAGS $CPPFLAGS t.c \
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>> out 2>&1 && break
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done
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if test $s -eq 0; then
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echo "Unable to calculate sizeof($t) for cross-compiling" >&2
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cat out >&2
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exit 1
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fi
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t=`echo $t | tr a-z A-Z | tr ' ' _`
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echo "#define SIZEOF_$t $s"
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echo "SIZEOF_$t := $s" >> config_detected.mk
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done
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# check endian-ness
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cat > t.c <<EOF
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short ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
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short ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
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void _ascii(void)
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{
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char *s = (char *)ascii_mm;
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s = (char *)ascii_ii;
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}
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short ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
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short ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
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void _ebcdic(void)
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{
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char *s = (char *)ebcdic_mm;
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s = (char *)ebcdic_ii;
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}
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int main(void)
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{
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_ascii();
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_ebcdic();
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return 0;
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}
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EOF
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echo "compiling endian test" > out
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$CC -o t.o $CFLAGS $CPPFLAGS t.c >> out 2>&1
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if grep BIGenDianSyS t.o >/dev/null 2>&1; then
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echo "#define WORDS_BIGENDIAN 1"
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echo "WORDS_BIGENDIAN := 1" >> config_detected.mk
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elif grep LiTTleEnDian t.o >/dev/null 2>&1; then
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echo "/* #undef WORDS_BIGENDIAN */"
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echo "# WORDS_BIGENDIAN :=" >> config_detected.mk
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else
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echo "Unable to determine endian-ness for cross compiling" >&2
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cat out >&2
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exit 1
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fi
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echo ''
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exec rm -f t.o out t.c
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