3 files changed, 84 insertions, 1 deletions
diff --git a/sci-libs/netcdf/files/netcdf-4.7.4-big-endian-build.patch b/sci-libs/netcdf/files/netcdf-4.7.4-big-endian-build.patch
new file mode 100644
index 000000000000..edad05a21e64
--- /dev/null
+++ b/sci-libs/netcdf/files/netcdf-4.7.4-big-endian-build.patch
@@ -0,0 +1,63 @@
+https://github.com/DennisHeimbigner/netcdf-c/commit/6f86660da86f279cad1f2804cf3242767de27630.patch
+https://github.com/Unidata/netcdf-c/issues/1687
+https://bugs.gentoo.org/772863
+
+From 6f86660da86f279cad1f2804cf3242767de27630 Mon Sep 17 00:00:00 2001
+From: Dennis Heimbigner <dmh@ucar.edu>
+Date: Fri, 3 Apr 2020 20:15:34 -0600
+Subject: [PATCH] Fix missing forward declarations
+
+re: issue https://github.com/Unidata/netcdf-c/issues/1687
+
+static functions are being used before decl and it causes
+errors. Only occurs when BIG_ENDIAN is defined.
+Solution is to add the forward declarations.
+---
+ libdispatch/dfilter.c       | 4 ++++
+ nc_test4/tst_filterparser.c | 5 +++++
+ plugins/H5Zutil.c           | 1 +
+ 3 files changed, 10 insertions(+)
+
+diff --git a/libdispatch/dfilter.c b/libdispatch/dfilter.c
+index 893846457..0e490a3d6 100644
+--- a/libdispatch/dfilter.c
++++ b/libdispatch/dfilter.c
+@@ -40,6 +40,10 @@ Unified filter related code
+ 
+ /* Forward */
+ static int gettype(const int q0, const int q1, int* unsignedp);
++#ifdef WORDS_BIGENDIAN
++static void byteswap8(unsigned char* mem);
++static void byteswap4(unsigned char* mem);
++#endif
+ 
+ const struct LegalFormat {
+     const char* tag;
+diff --git a/nc_test4/tst_filterparser.c b/nc_test4/tst_filterparser.c
+index 7d02f2bc7..b32094a25 100644
+--- a/nc_test4/tst_filterparser.c
++++ b/nc_test4/tst_filterparser.c
+@@ -122,6 +122,11 @@ static const char* spectype[] = {"i", "b", "ub", "s", "us", "i", "ui", "i", "i",
+ 
+ static int nerrs = 0;
+ 
++#ifdef WORDS_BIGENDIAN
++static void byteswap8(unsigned char* mem);
++static void byteswap4(unsigned char* mem);
++#endif
++
+ static void
+ mismatch(size_t i, unsigned int *params, const char* tag)
+ {
+diff --git a/plugins/H5Zutil.c b/plugins/H5Zutil.c
+index cb36dc96c..86dfb0cfa 100644
+--- a/plugins/H5Zutil.c
++++ b/plugins/H5Zutil.c
+@@ -4,6 +4,7 @@
+  */
+ 
+ 
++#include "config.h"
+ #include <hdf5.h>
+ 
+ /*
diff --git a/sci-libs/netcdf/files/netcdf-4.7.4-big-endian-test.patch b/sci-libs/netcdf/files/netcdf-4.7.4-big-endian-test.patch
new file mode 100644
index 000000000000..cdc39a6a7729
--- /dev/null
+++ b/sci-libs/netcdf/files/netcdf-4.7.4-big-endian-test.patch
@@ -0,0 +1,16 @@
+Fixes ncdump_tst_netcdf4 test failure on big endian.
+https://github.com/Unidata/netcdf-c/issues/1896
+diff --git a/ncdump/tst_special_atts.c b/ncdump/tst_special_atts.c
+index 9655b86..e71cb7e 100644
+--- a/ncdump/tst_special_atts.c
++++ b/ncdump/tst_special_atts.c
+@@ -145,6 +145,10 @@ main(int argc, char **argv)
+    /* Set _Storage as compact */
+    if (nc_def_var_chunking(ncid, var6id, NC_COMPACT, NULL)) ERR;
+    if (nc_def_var_chunking(ncid, var7id, NC_COMPACT, NULL)) ERR;
++#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
++   if (nc_def_var_endian(ncid, var6id, NC_ENDIAN_LITTLE)) ERR;
++   if (nc_def_var_endian(ncid, var7id, NC_ENDIAN_LITTLE)) ERR;
++#endif
+ 
+    if (nc_enddef(ncid)) ERR;
diff --git a/sci-libs/netcdf/netcdf-4.7.4.ebuild b/sci-libs/netcdf/netcdf-4.7.4.ebuild
index 0e3c2b88868a..c45ee223982e 100644
--- a/sci-libs/netcdf/netcdf-4.7.4.ebuild
+++ b/sci-libs/netcdf/netcdf-4.7.4.ebuild
@@ -8,6 +8,7 @@ inherit cmake
 DESCRIPTION="Scientific library and interface for array oriented data access"
 HOMEPAGE="https://www.unidata.ucar.edu/software/netcdf/"
 SRC_URI="https://github.com/Unidata/netcdf-c/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+S="${WORKDIR}/${PN}-c-${PV}"
 
 LICENSE="UCAR-Unidata"
 SLOT="0/18"
@@ -33,7 +34,10 @@ REQUIRED_USE="
 	szip? ( hdf5 )
 	mpi? ( hdf5 )"
 
-S="${WORKDIR}/${PN}-c-${PV}"
+PATCHES=(
+	"${FILESDIR}/${PN}-4.7.4-big-endian-build.patch"
+	"${FILESDIR}/${PN}-4.7.4-big-endian-test.patch"
+)
 
 src_prepare() {
 	# skip test that requires network