From 2bc0fdf26c12f479bb083a45fb4cc89480edf2c1 Mon Sep 17 00:00:00 2001
From: Luca Heltai <luca.heltai@sissa.it>
Date: Thu, 28 Jan 2021 12:31:48 +0100
Subject: [PATCH] Add support for gmsh api in cmake.

---
 cmake/configure/configure_gmsh.cmake |  1 +
 cmake/modules/FindGMSH.cmake         | 38 ++++++++++++++++++++++++++--
 include/deal.II/base/config.h.in     |  3 +++
 3 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/cmake/configure/configure_gmsh.cmake b/cmake/configure/configure_gmsh.cmake
index 9418a815bc..75e7404d90 100644
--- a/cmake/configure/configure_gmsh.cmake
+++ b/cmake/configure/configure_gmsh.cmake
@@ -18,3 +18,4 @@
 #
 
 CONFIGURE_FEATURE(GMSH)
+SET(DEAL_II_GMSH_WITH_API ${GMSH_WITH_API})
diff --git a/cmake/modules/FindGMSH.cmake b/cmake/modules/FindGMSH.cmake
index b346ca374c..3a715dc97d 100644
--- a/cmake/modules/FindGMSH.cmake
+++ b/cmake/modules/FindGMSH.cmake
@@ -19,18 +19,52 @@
 # This module exports
 #
 #   GMSH_EXECUTABLE
+#   GMSH_LIBRARY
+#   GMSH_INCLUDE_DIR
+#   GMSH_WITH_API
 #
 
 SET(GMSH_DIR "" CACHE PATH "An optional hint to a Gmsh installation containing the gmsh executable")
 SET_IF_EMPTY(GMSH_DIR "$ENV{GMSH_DIR}")
 
+SET(GMSH_LIBRARY_DIR "" CACHE PATH "An optional hint to a Gmsh SDK installation")
+SET_IF_EMPTY(GMSH_LIBRARY_DIR "$ENV{GMSH_DIR}")
+
 DEAL_II_FIND_PROGRAM(GMSH_EXE gmsh${CMAKE_EXECUTABLE_SUFFIX}
   HINTS ${GMSH_DIR}
   PATH_SUFFIXES bin
   )
 
+DEAL_II_FIND_LIBRARY(GMSH_LIBRARY
+  NAMES gmsh
+  HINTS ${GMSH_LIBRARY_DIR}
+  PATH_SUFFIXES lib${LIB_SUFFIX} lib64 lib
+  )
+
+DEAL_II_FIND_PATH(GMSH_INCLUDE_DIR gmsh.h
+  HINTS ${GMSH_LIBRARY_DIR}
+  PATH_SUFFIXES include
+  )
+
+IF(GMSH_LIBRARY MATCHES "-NOTFOUND" OR 
+   GMSH_INCLUDE_DIR MATCHES "-NOTFOUND")
+  SET(GMSH_WITH_API FALSE)
+ELSE()
+  SET(GMSH_WITH_API TRUE)
+ENDIF()
+
 DEAL_II_PACKAGE_HANDLE(GMSH
-  EXECUTABLE REQUIRED GMSH_EXE
+  EXECUTABLE 
+    REQUIRED GMSH_EXE
+  LIBRARIES
+    OPTIONAL GMSH_LIBRARY
+  INCLUDE_DIRS 
+    OPTIONAL GMSH_INCLUDE_DIR
+  USER_INCLUDE_DIRS 
+    OPTIONAL GMSH_INCLUDE_DIR
   CLEAR
-    GMSH_EXE
+    GMSH_EXE 
+    GMSH_LIBRARY 
+    GMSH_INCLUDE_DIR 
+    GMSH_WITH_API
   )
diff --git a/include/deal.II/base/config.h.in b/include/deal.II/base/config.h.in
index 27e0d959e1..fba8f32f69 100644
--- a/include/deal.II/base/config.h.in
+++ b/include/deal.II/base/config.h.in
@@ -192,6 +192,9 @@
 /* cmake/modules/FindARPACK.cmake */
 #cmakedefine DEAL_II_ARPACK_WITH_PARPACK
 
+/* cmake/modules/FindGMSH.cmake */
+#cmakedefine DEAL_II_GMSH_WITH_API
+
 /* cmake/modules/FindPETSC.cmake */
 #cmakedefine DEAL_II_PETSC_WITH_COMPLEX
 #cmakedefine DEAL_II_PETSC_WITH_HYPRE
-- 
2.39.5