From 078323010b5d88485748d05e512d451b876992b5 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Mon, 20 Oct 2008 08:43:10 +0000
Subject: [PATCH] dc: conditionalize parts which require libm

---
 editors/Config.in                                      | 2 +-
 miscutils/Config.in                                    | 8 ++++++++
 miscutils/dc.c                                         | 4 ++++
 shell/ash_test/ash-standalone/noexec_gets_no_env.right | 2 ++
 shell/ash_test/ash-standalone/noexec_gets_no_env.tests | 2 ++
 5 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/editors/Config.in b/editors/Config.in
index 27426bc2e..0388737c3 100644
--- a/editors/Config.in
+++ b/editors/Config.in
@@ -14,7 +14,7 @@ config AWK
 
 config FEATURE_AWK_MATH
 	bool "Enable math functions (requires libm)"
-	default y
+	default n
 	depends on AWK
 	help
 	  Enable math functions of the Awk programming language.
diff --git a/miscutils/Config.in b/miscutils/Config.in
index 0c80ae6e9..15f677a73 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -138,6 +138,14 @@ config DC
 	  Dc is a reverse-polish desk calculator which supports unlimited
 	  precision arithmetic.
 
+config FEATURE_DC_LIBM
+	bool "Enable power and exp functions (requires libm)"
+	default n
+	depends on DC
+	help
+	  Enable power and exp functions.
+	  NOTE: This will require libm to be present for linking.
+
 config DEVFSD
 	bool "devfsd (obsolete)"
 	default n
diff --git a/miscutils/dc.c b/miscutils/dc.c
index 47ec060c8..7d5886eb2 100644
--- a/miscutils/dc.c
+++ b/miscutils/dc.c
@@ -53,12 +53,14 @@ static void mul(void)
 	push(pop() * pop());
 }
 
+#if ENABLE_FEATURE_DC_LIBM
 static void power(void)
 {
 	double topower = pop();
 
 	push(pow(pop(), topower));
 }
+#endif
 
 static void divide(void)
 {
@@ -137,9 +139,11 @@ static const struct op operators[] = {
 	{"mul", mul},
 	{"/",   divide},
 	{"div", divide},
+#if ENABLE_FEATURE_DC_LIBM
 	{"**",  power},
 	{"exp", power},
 	{"pow", power},
+#endif
 	{"%",   mod},
 	{"mod", mod},
 	{"and", and},
diff --git a/shell/ash_test/ash-standalone/noexec_gets_no_env.right b/shell/ash_test/ash-standalone/noexec_gets_no_env.right
index 3d55d73b8..8522dff31 100644
--- a/shell/ash_test/ash-standalone/noexec_gets_no_env.right
+++ b/shell/ash_test/ash-standalone/noexec_gets_no_env.right
@@ -1,2 +1,4 @@
 VAR7=VAL
 0
+VAR8=VAL
+0
diff --git a/shell/ash_test/ash-standalone/noexec_gets_no_env.tests b/shell/ash_test/ash-standalone/noexec_gets_no_env.tests
index 5e12e5a25..0d347bdcd 100755
--- a/shell/ash_test/ash-standalone/noexec_gets_no_env.tests
+++ b/shell/ash_test/ash-standalone/noexec_gets_no_env.tests
@@ -1,3 +1,5 @@
 export VAR7=VAL
 env | grep ^VAR7=
 echo $?
+VAR8=VAL env | grep ^VAR8=
+echo $?