x86: Check awk features before generating inat-tables.c

[pandora-kernel.git] / arch / x86 / tools / gen-insn-attr-x86.awk

diff --git a/arch/x86/tools/gen-insn-attr-x86.awk b/arch/x86/tools/gen-insn-attr-x86.awk
index 93b62c9..19ba096 100644 (file)
--- a/arch/x86/tools/gen-insn-attr-x86.awk
+++ b/arch/x86/tools/gen-insn-attr-x86.awk
@@ -4,7 +4,25 @@
 #
 # Usage: awk -f gen-insn-attr-x86.awk x86-opcode-map.txt > inat-tables.c
 
+# Awk implementation sanity check
+function check_awk_implement() {
+       if (!match("abc", "[[:lower:]]+"))
+               return "Your awk doesn't support charactor-class."
+       if (sprintf("%x", 0) != "0")
+               return "Your awk has a printf-format problem."
+       return ""
+}
+
 BEGIN {
+       # Implementation error checking
+       awkchecked = check_awk_implement()
+       if (awkchecked != "") {
+               print "Error: " awkchecked > "/dev/stderr"
+               print "Please try to use gawk." > "/dev/stderr"
+               exit 1
+       }
+
+       # Setup generating tables
        print "/* x86 opcode map generated from x86-opcode-map.txt */"
        print "/* Do not change this code. */"
        ggid = 1
@@ -293,6 +311,8 @@ function convert_operands(opnd,       i,imm,mod)
 }
 
 END {
+       if (awkchecked != "")
+               exit 1
        # print escape opcode map's array
        print "/* Escape opcode map array */"
        print "const insn_attr_t const *inat_escape_tables[INAT_ESC_MAX + 1]" \