gnu: nss: Prepare for GCC 10.

* gnu/packages/patches/nss-getcwd-nonnull.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/nss.scm (nss)[source](patches): Add it.

1 files changed, 30 insertions, 0 deletions

diff --git a/gnu/packages/patches/nss-getcwd-nonnull.patch b/gnu/packages/patches/nss-getcwd-nonnull.patch
new file mode 100644
index 0000000000..d367c37f32
--- /dev/null
+++ b/gnu/packages/patches/nss-getcwd-nonnull.patch
@@ -0,0 +1,30 @@
+Disable -Werror=nonnull on getcwd(0, 4096) because GCC incorrectly warns that
+the second argument should be NULL with recent glibc.  See:
+
+https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96832
+https://sourceware.org/bugzilla/show_bug.cgi?id=26545
+
+diff --git a/coreconf/nsinstall/nsinstall.c b/coreconf/nsinstall/nsinstall.c
+--- a/coreconf/nsinstall/nsinstall.c
++++ b/coreconf/nsinstall/nsinstall.c
+@@ -236,14 +236,20 @@ main(int argc, char **argv)
+ 	return 0;
+ 
+     if (!cwd) {
++#pragma GCC diagnostic push
++#pragma GCC diagnostic ignored "-Wnonnull"
+ 	cwd = GETCWD(0, PATH_MAX);
++#pragma GCC diagnostic pop
+ 	if (!cwd)
+ 	    fail("could not get CWD");
+     }
+ 
+     /* make sure we can get into todir. */
+     xchdir(todir);
++#pragma GCC diagnostic push
++#pragma GCC diagnostic ignored "-Wnonnull"
+     todir = GETCWD(0, PATH_MAX);
++#pragma GCC diagnostic pop
+     if (!todir)
+ 	fail("could not get CWD in todir");
+     tdlen = strlen(todir);