osage: autotools: define NEATOGEN_EXPORTS

osage is part of the neato_layout plugin.

Fixes these errors using autotools with MinGW:

C:/tools/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: ../../lib/osage/.libs/libosage_C.a(osageinit.o): in function `cluster_init_graph':
C:\Users\magja\graphviz\lib\osage/osageinit.c:69: undefined reference to `__imp_neato_init_node'
C:/tools/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: ../../lib/osage/.libs/libosage_C.a(osageinit.o): in function `osage_layout':
C:\Users\magja\graphviz\lib\osage/osageinit.c:367: undefined reference to `__imp_spline_edges1'
C:/tools/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\Users\magja\graphviz\lib\osage/osageinit.c:363: undefined reference to `__imp_spline_edges0'

Towards https://gitlab.com/graphviz/graphviz/-/issues/2058

diff --git a/lib/osage/Makefile.am b/lib/osage/Makefile.am
index 1c73b781f8ee223c07466a581844cd04fbd5d43a..c7ce05eb7a78b98c787a1a403c8d84a202cacf8f 100644 (file)
--- a/lib/osage/Makefile.am
+++ b/lib/osage/Makefile.am
@@ -9,6 +9,10 @@ AM_CPPFLAGS = \
        -I$(top_srcdir)/lib/cgraph \
        -I$(top_srcdir)/lib/cdt
 
+if WITH_WIN32
+AM_CFLAGS = -DNEATOGEN_EXPORTS=1
+endif
+
 noinst_HEADERS = osage.h
 noinst_LTLIBRARIES = libosage_C.la