From a57598defe119bcd1e7c564ddec6fe8f3705ed4b Mon Sep 17 00:00:00 2001
From: Chuck Atkins <chuck.atkins@kitware.com>
Date: Thu, 11 Feb 2021 10:35:51 -0500
Subject: [PATCH] doxygen: fix gcc getting stuck in an infinite loop (#21614)

---
 .../doxygen/gcc-partial-inlining-bug.patch         | 14 ++++++++++++++
 .../repos/builtin/packages/doxygen/package.py      |  3 +++
 2 files changed, 17 insertions(+)
 create mode 100644 var/spack/repos/builtin/packages/doxygen/gcc-partial-inlining-bug.patch

diff --git a/var/spack/repos/builtin/packages/doxygen/gcc-partial-inlining-bug.patch b/var/spack/repos/builtin/packages/doxygen/gcc-partial-inlining-bug.patch
new file mode 100644
index 0000000000..13d0a78e80
--- /dev/null
+++ b/var/spack/repos/builtin/packages/doxygen/gcc-partial-inlining-bug.patch
@@ -0,0 +1,14 @@
+--- a/src/CMakeLists.txt	2021-02-10 22:55:14.766411242 -0500
++++ b/src/CMakeLists.txt	2021-02-10 23:10:17.651541580 -0500
+@@ -305,6 +305,11 @@
+     xmldocvisitor.cpp
+     xmlgen.cpp
+ )
++# Work aroung for GCC bug getting stuck in an infinite loop
++if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
++set_source_files_properties(doxygen.cpp PROPERTIES COMPILE_FLAGS -fno-partial-inlining)
++endif()
++
+ add_sanitizers(doxymain)
+ 
+ # LLVM/clang headers give a lot of warnings with -Wshadow and -Wcast-align so we disable them for
diff --git a/var/spack/repos/builtin/packages/doxygen/package.py b/var/spack/repos/builtin/packages/doxygen/package.py
index bac517bbb2..85ec0061c0 100644
--- a/var/spack/repos/builtin/packages/doxygen/package.py
+++ b/var/spack/repos/builtin/packages/doxygen/package.py
@@ -75,6 +75,9 @@ def determine_variants(cls, exes, version_str):
     # Also - https://github.com/doxygen/doxygen/pull/6588
     patch('shared_ptr.patch', when='@1.8.14')
 
+    # Workaround for gcc getting stuck in an infinite loop
+    patch('gcc-partial-inlining-bug.patch', when='@1.8.20: %gcc@7')
+
     def patch(self):
         if self.spec['iconv'].name == 'libc':
             return