From 60c76dfc07d52252d3e5b75fb12f34d445a36b74 Mon Sep 17 00:00:00 2001
From: Alexander Puck Neuwirth <alexander@neuwirth-informatik.de>
Date: Thu, 28 May 2026 10:54:36 +0200
Subject: [PATCH] add option to compile static library for madgraph

---
 CMakeLists.txt | 38 ++++++++++++++++++++++++++------------
 README.md      |  1 +
 2 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 849d137..e73f16a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -99,26 +99,40 @@ endif()
 # libqcdloop configuration
 include_directories(src/qcdloop src)
 FILE(GLOB_RECURSE Headers "src/qcdloop/*.h")
-add_library(qcdloop SHARED src/box.cc
-                         src/bubble.cc
-                         src/cache.cc
-                         src/qcdloop.cc
-                         src/tadpole.cc
-                         src/tools.cc
-                         src/topology.cc
-                         src/triangle.cc
-                         src/types.cc
-                         src/wrapper.cc
-                         ${Headers}
+option(ENABLE_STATIC_LIBRARY "Build static libqcdloop.a in addition to the shared library" OFF)
+set(QCDLOOP_SOURCES src/box.cc
+                    src/bubble.cc
+                    src/cache.cc
+                    src/qcdloop.cc
+                    src/tadpole.cc
+                    src/tools.cc
+                    src/topology.cc
+                    src/triangle.cc
+                    src/types.cc
+                    src/wrapper.cc
+                    ${Headers}
 )
 
+add_library(qcdloop SHARED ${QCDLOOP_SOURCES})
+
+set(QCDLOOP_INSTALL_TARGETS qcdloop)
+if(ENABLE_STATIC_LIBRARY)
+  add_library(qcdloop_static STATIC ${QCDLOOP_SOURCES})
+  set_target_properties(qcdloop_static PROPERTIES OUTPUT_NAME qcdloop)
+  target_link_libraries(qcdloop_static ${QUADMATH_LIBRARY})
+  list(APPEND QCDLOOP_INSTALL_TARGETS qcdloop_static)
+endif()
+
 target_link_libraries(qcdloop ${QUADMATH_LIBRARY})
 install(FILES ${CMAKE_BINARY_DIR}/src/qcdloop-config
   DESTINATION bin PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ
   GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
 install(FILES ${PROJECT_SOURCE_DIR}/src/qcdloop.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 install(DIRECTORY src/qcdloop DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
-install(TARGETS qcdloop DESTINATION ${CMAKE_INSTALL_LIBDIR})
+install(TARGETS ${QCDLOOP_INSTALL_TARGETS}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 
 # enable disable fortran/wrapper (to avoid name conflicts with ql1.x)
 option(ENABLE_FORTRAN_WRAPPER "Enable fortran wrapper" ON)
diff --git a/README.md b/README.md
index 277b1eb..cb51077 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ C++11 and `quadmath` features (e.g. `gcc >= 5`).
 Other qcdloop cmake options are:
 - `ENABLE_EXAMPLES`, build examples in C++, default `OFF`.
 - `ENABLE_FORTRAN_WRAPPER`, include fortran wrapper in the library, default `ON`.
+- `ENABLE_STATIC_LIBRARY`, build `libqcdloop.a` in addition to the shared library, default `OFF`.
 
 The fortran wrapper follows the previous syntax in `qcdloop`, see details in table 2 of https://arxiv.org/pdf/1605.03181.pdf.