[gtksourceview] build: use LT_LIB_M instead of hardcoding -lm

[Sébastien Wilmet <swilmet src gnome org>]

commit a6388e26fe1b3d92afe45bf7a11ef511a7ea0437
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Wed Dec 21 19:45:13 2016 +0100

    build: use LT_LIB_M instead of hardcoding -lm

 configure.ac              |    3 +++
 gtksourceview/Makefile.am |    2 +-
 tests/Makefile.am         |    2 +-
 testsuite/Makefile.am     |    2 +-
 4 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f9fa7f6..79709b4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -144,6 +144,9 @@ case "$host" in
 esac
 AC_SUBST(HIDDEN_VISIBILITY_CFLAGS)
 
+# Dynamic linking dependencies
+LT_LIB_M
+
 AX_REQUIRE_DEFINED([AX_PKG_CHECK_MODULES])
 AX_PKG_CHECK_MODULES([DEP],
                     [glib-2.0 >= $glib_req  gio-2.0 >= $glib_req  gtk+-3.0 >= $gtk_req],
diff --git a/gtksourceview/Makefile.am b/gtksourceview/Makefile.am
index 51b3665..3f47154 100644
--- a/gtksourceview/Makefile.am
+++ b/gtksourceview/Makefile.am
@@ -179,10 +179,10 @@ lib_LTLIBRARIES = libgtksourceview-@GSV_API_VERSION@.la
 libgtksourceview_@GSV_API_VERSION@_la_SOURCES =
 
 libgtksourceview_@GSV_API_VERSION@_la_LIBADD =                                 \
-       -lm                                                             \
        libgtksourceview-core.la                                        \
        completion-providers/words/libgtksourcecompletionwords.la       \
        $(CODE_COVERAGE_LIBS)                                           \
+       $(LIBM)                                                         \
        $(DEP_LIBS)                                                     \
        $(GTK_MAC_LIBS)
 
diff --git a/tests/Makefile.am b/tests/Makefile.am
index cc78640..d8f231e 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -12,7 +12,7 @@ AM_CPPFLAGS =                                 \
 AM_LDFLAGS = $(WARN_LDFLAGS)
 
 LDADD = $(top_builddir)/gtksourceview/libgtksourceview-@GSV_API_VERSION@.la \
-       -lm \
+       $(LIBM) \
        $(DEP_LIBS) \
        $(TESTS_LIBS)
 
diff --git a/testsuite/Makefile.am b/testsuite/Makefile.am
index d082a90..6660c08 100644
--- a/testsuite/Makefile.am
+++ b/testsuite/Makefile.am
@@ -24,7 +24,7 @@ AM_LDFLAGS = $(WARN_LDFLAGS)
 
 LDADD = $(top_builddir)/gtksourceview/completion-providers/words/libgtksourcecompletionwords.la \
        $(top_builddir)/gtksourceview/libgtksourceview-core.la \
-       -lm \
+       $(LIBM) \
        $(DEP_LIBS) \
        $(TESTS_LIBS)