[PATCH 15/18] x86: Check awk features before generating inat-tables.c

[Frederic Weisbecker]

From: Masami Hiramatsu <mhiramat@xxxxxxxxxx>

Check some awk mandatory features to generate inat-tables.c
that old mawk doesn't support.

Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Jim Keniston <jkenisto@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Frank Ch. Eigler <fche@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Jason Baron <jbaron@xxxxxxxxxx>
Cc: K.Prasad <prasad@xxxxxxxxxxxxxxxxxx>
Cc: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: PrzemysÅaw PaweÅczyk <przemyslaw@xxxxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
Cc: Vegard Nossum <vegard.nossum@xxxxxxxxx>
LKML-Reference: <20090821194316.12478.57394.stgit@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
 arch/x86/tools/gen-insn-attr-x86.awk |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/arch/x86/tools/gen-insn-attr-x86.awk b/arch/x86/tools/gen-insn-attr-x86.awk
index 93b62c9..19ba096 100644
--- 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]" \
-- 
1.6.2.3

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