From: Hans Ulrich Niedermann <hun@n-dimensional.de>
Date: Wed, 9 Feb 2005 01:44:06 +0000 (+0100)
Subject: check whether -lm is required -> enable crosscompile for windows
X-Git-Tag: libexif-0_6_21-release~662
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=03c58065b1f7859ceedab5a0dbe69cbde69b192f;p=platform%2Fupstream%2Flibexif.git

check whether -lm is required -> enable crosscompile for windows
---

diff --git a/configure.in b/configure.in
index f019da4..9be0bab 100644
--- a/configure.in
+++ b/configure.in
@@ -38,6 +38,18 @@ AC_NEED_STDINT_H([libexif/_stdint.h])
 
 
 dnl ---------------------------------------------------------------------------
+dnl Whether -lm is required for our math functions
+dnl ---------------------------------------------------------------------------
+
+# we need sqrt and pow, but checking for sqrt should be sufficient
+AC_CHECK_FUNC([sqrt],,[
+AC_CHECK_LIB([m],[sqrt],[MATHLIBS="-lm"],AC_MSG_ERROR([
+*** Couldn't find sqrt
+]))])
+AC_SUBST(MATHLIBS)
+
+
+dnl ---------------------------------------------------------------------------
 dnl i18n support
 dnl ---------------------------------------------------------------------------
 GETTEXT_PACKAGE=${PACKAGE}-${LIBEXIF_CURRENT}
diff --git a/libexif/Makefile.am b/libexif/Makefile.am
index 1a87b52..6154e85 100644
--- a/libexif/Makefile.am
+++ b/libexif/Makefile.am
@@ -22,7 +22,8 @@ libexif_la_SOURCES =		\
 	exif-tag.c		\
 	exif-utils.c		\
 	i18n.h
-libexif_la_LIBADD = -lm 		\
+libexif_la_LIBADD =			\
+	$(MATHLIBS)			\
 	$(LTLIBINTL)			\
 	canon/libmnote-canon.la		\
 	olympus/libmnote-olympus.la	\