From f9ffdcbc348451c462c3eaf237d80dd9672ffbcd Mon Sep 17 00:00:00 2001
From: Magnus Jacobsson <Magnus.Jacobsson@berotec.se>
Date: Thu, 22 Jul 2021 15:16:32 +0200
Subject: [PATCH] cdt: autotools: define EXPORT_CDT

Fixes errors like this when using autotools with MinGW:

lib\cdt/dtclose.c:23: undefined reference to `__imp_dtview'

Also fixes warnings like:

dtview.c:91:7: warning: 'dtview' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
       91 | Dt_t* dtview(Dt_t* dt, Dt_t* view)
          |       ^~~~~~

Towards https://gitlab.com/graphviz/graphviz/-/issues/2058
---
 lib/cdt/Makefile.am | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/cdt/Makefile.am b/lib/cdt/Makefile.am
index 2f8455168..f2e99cab1 100644
--- a/lib/cdt/Makefile.am
+++ b/lib/cdt/Makefile.am
@@ -8,6 +8,10 @@ pkgconfigdir = $(libdir)/pkgconfig
 
 AM_CPPFLAGS = -I$(top_srcdir)/lib
 
+if WITH_WIN32
+AM_CFLAGS = -DEXPORT_CDT=1
+endif
+
 pkginclude_HEADERS = cdt.h
 noinst_HEADERS = dthdr.h
 noinst_LTLIBRARIES = libcdt_C.la
-- 
2.40.0