On i386 GNU/Linux, when compiling with -D_FILE_OFFSET_BITS=64, <fcntl.h>
winds up doing this:
# define F_GETLK F_GETLK64 /* Get record locking info. */
...
# define F_GETLK64 12 /* Get record locking info. */
Because of the ordering, -fdump-go-spec does not write F_GETLK into the
file that it creates. The effect is that syscall.F_GETLK is not defined
for i386 GNU/Linux. This patch fixes the problem. Bootstrapped and ran
Go testsuite on x86_64-unknown-linux-gnu, both 32-bit and 64-bit mode.
Committed to mainline and 4.7 branch.
Ian
diff -r a602dc132c2d libgo/mksysinfo.sh
--- a/libgo/mksysinfo.sh Tue Aug 14 20:46:42 2012 -0700
+++ b/libgo/mksysinfo.sh Mon Aug 20 22:10:34 2012 -0700
@@ -211,6 +211,16 @@
echo "const O_CLOEXEC = 0" >> ${OUT}
fi
+# These flags can be lost on i386 GNU/Linux when using
+# -D_FILE_OFFSET_BITS=64, because we see "#define F_SETLK F_SETLK64"
+# before we see the definition of F_SETLK64.
+for flag in F_GETLK F_SETLK F_SETLKW; do
+ if ! grep "^const ${flag} " ${OUT} >/dev/null 2>&1 \
+ && grep "^const ${flag}64 " ${OUT} >/dev/null 2>&1; then
+ echo "const ${flag} = ${flag}64" >> ${OUT}
+ fi
+done
+
# The signal numbers.
grep '^const _SIG[^_]' gen-sysinfo.go | \
grep -v '^const _SIGEV_' | \
