app-doc/doxygen: fix build w/ musl-1.2.4

Closes: https://bugs.gentoo.org/906920
Signed-off-by: Sam James <sam@gentoo.org>

app-doc/doxygen/doxygen-1.9.7-r1.ebuild

@@ -65,6 +65,7 @@ PATCHES=(
 	"${FILESDIR}/${PN}-1.9.4-link_with_pthread.patch"
 	"${FILESDIR}/${PN}-1.9.1-ignore-bad-encoding.patch"
 	"${FILESDIR}/${PN}-1.9.1-do_not_force_libcxx.patch"
+	"${FILESDIR}/${PN}-1.9.7-musl-1.2.4.patch"
 )
 
 DOCS=( LANGUAGE.HOWTO README.md )

app-doc/doxygen/doxygen-9999.ebuild

@@ -65,6 +65,7 @@ PATCHES=(
 	"${FILESDIR}/${PN}-1.9.4-link_with_pthread.patch"
 	"${FILESDIR}/${PN}-1.9.1-ignore-bad-encoding.patch"
 	"${FILESDIR}/${PN}-1.9.1-do_not_force_libcxx.patch"
+	"${FILESDIR}/${PN}-1.9.7-musl-1.2.4.patch"
 )
 
 DOCS=( LANGUAGE.HOWTO README.md )

app-doc/doxygen/files/doxygen-1.9.7-musl-1.2.4.patch

@@ -0,0 +1,26 @@
+https://bugs.gentoo.org/906920
+https://gitlab.exherbo.org/exherbo/arbor/-/commit/7b517ba0068adc471fe7b2ed8cfbb191a197ca17
+
+From 6d713aa98b36ee8219294515142c0225fbd09dfc Mon Sep 17 00:00:00 2001
+From: Heiko Becker <heirecka@exherbo.org>
+Date: Thu, 25 May 2023 10:52:29 +0200
+Subject: [PATCH] Apply upstream fix for spdlog
+
+Fixes the build with musl >= 1.2.4, see
+https://github.com/gabime/spdlog/commit/287a00d364990edbb621fe5e392aeb550135fb96
+for details.
+--- a/deps/spdlog/include/spdlog/details/os-inl.h
++++ b/deps/spdlog/include/spdlog/details/os-inl.h
+@@ -236,8 +236,8 @@ SPDLOG_INLINE size_t filesize(FILE *f)
+ #    else
+     int fd = ::fileno(f);
+ #    endif
+-// 64 bits(but not in osx or cygwin, where fstat64 is deprecated)
+-#    if (defined(__linux__) || defined(__sun) || defined(_AIX)) && (defined(__LP64__) || defined(_LP64))
++// 64 bits(but not in osx, linux/musl or cygwin, where fstat64 is deprecated)
++#    if ((defined(__linux__) && defined(__GLIBC__)) || defined(__sun) || defined(_AIX)) && (defined(__LP64__) || defined(_LP64))
+     struct stat64 st;
+     if (::fstat64(fd, &st) == 0)
+     {
+-- 
+2.41.0.rc2