[PATCH] examples: link mfcalc with -lm for uses of pow, cos, atan, etc.

[Jim Meyering]

Building from cloned sources, I got this:

...
gcc -std=gnu99 -Wall -Wextra -Wno-sign-compare -Wcast-align -Wcast-qual -Wformat
-Wpointer-arith -Wwrite-strings -Wbad-function-cast -Wmissing-declarations 
-Wmiss
ing-prototypes -Wshadow -Wstrict-prototypes -g -O2   -o examples/mfcalc/mfcalc 
ex
amples/mfcalc/examples_mfcalc_mfcalc-mfcalc.o lib/libbison.a
examples/mfcalc/examples_mfcalc_mfcalc-mfcalc.o: In function `yyparse':
/h/j/w/co/bison/../../doc/bison.texinfo:2419: undefined reference to `pow'
examples/mfcalc/examples_mfcalc_mfcalc-mfcalc.o:(.rodata+0x88): undefined 
reference to `atan'
examples/mfcalc/examples_mfcalc_mfcalc-mfcalc.o:(.rodata+0x98): undefined 
reference to `cos'
examples/mfcalc/examples_mfcalc_mfcalc-mfcalc.o:(.rodata+0xa8): undefined 
reference to `exp'
examples/mfcalc/examples_mfcalc_mfcalc-mfcalc.o:(.rodata+0xb8): undefined 
reference to `log'
examples/mfcalc/examples_mfcalc_mfcalc-mfcalc.o:(.rodata+0xc8): undefined 
reference to `sin'
examples/mfcalc/examples_mfcalc_mfcalc-mfcalc.o:(.rodata+0xd8): undefined 
reference to `sqrt'
collect2: error: ld returned 1 exit status
make[3]: *** [examples/mfcalc/mfcalc] Error 1
make[3]: *** Waiting for unfinished jobs....

Here's one way to fix it:

>From cbef12deb94918d4f24286d498bcedba4938d6fa Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Fri, 17 Feb 2012 08:36:57 +0100
Subject: [PATCH] examples: link mfcalc with -lm for uses of pow, cos, atan,
 etc.

* examples/mfcalc/local.mk (examples_mfcalc_mfcalc_LDADD): Define.
---
 examples/mfcalc/local.mk |    1 +
 1 file changed, 1 insertion(+)

diff --git a/examples/mfcalc/local.mk b/examples/mfcalc/local.mk
index aae9e04..e34d8d7 100644
--- a/examples/mfcalc/local.mk
+++ b/examples/mfcalc/local.mk
@@ -49,6 +49,7 @@ mfcalc_sources =                              \
   $(mfcalc_extracted)

 check_PROGRAMS += examples/mfcalc/mfcalc
+examples_mfcalc_mfcalc_LDADD = -lm
 examples_mfcalc_mfcalc_SOURCES =               \
   $(mfcalc_sources)

--
1.7.9.1.232.g1a183