1 files changed, 45 insertions, 0 deletions
diff --git a/sys-libs/zlib/files/zlib-1.2.12-fix-CC-logic-in-configure.patch b/sys-libs/zlib/files/zlib-1.2.12-fix-CC-logic-in-configure.patch
new file mode 100644
index 000000000000..7fb13325b114
--- /dev/null
+++ b/sys-libs/zlib/files/zlib-1.2.12-fix-CC-logic-in-configure.patch
@@ -0,0 +1,45 @@
+https://github.com/madler/zlib/pull/607
+
+From 80d086357a55b94a13e43756cf3e131f25eef0e4 Mon Sep 17 00:00:00 2001
+From: Sam James <sam@gentoo.org>
+Date: Mon, 28 Mar 2022 08:40:45 +0100
+Subject: [PATCH] Fix CC logic in configure
+
+In https://github.com/madler/zlib/commit/e9a52aa129efe3834383e415580716a7c4027f8d,
+the logic was changed to try check harder for GCC, but it dropped
+the default setting of cc=${CC}. It was throwing away any pre-set CC value as
+a result.
+
+The rest of the script then cascades down a bad path because it's convinced
+it's not GCC or a GCC-like compiler.
+
+This led to e.g. misdetection of inability to build shared libs
+for say, multilib cases (w/ CC being one thing from the environment being used
+for one test (e.g. x86_64-unknown-linux-gnu-gcc -m32 and then 'cc' used for
+shared libs (but missing "-m32"!)). Obviously just one example of how
+the old logic could break.
+
+This restores the old default of 'CC' if nothing overrides it later
+in configure.
+
+Bug: https://bugs.gentoo.org/836308
+Signed-off-by: Sam James <sam@gentoo.org>
+---
+ configure | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/configure b/configure
+index 52ff4a04e..3fa3e8618 100755
+--- a/configure
++++ b/configure
+@@ -174,7 +174,10 @@ if test -z "$CC"; then
+   else
+     cc=${CROSS_PREFIX}cc
+   fi
++else
++  cc=${CC}
+ fi
++
+ cflags=${CFLAGS-"-O3"}
+ # to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
+ case "$cc" in