From 2e2417894ac5d35bc3d93b86c18f4df299f4d933 Mon Sep 17 00:00:00 2001 From: graysky Date: Sat, 12 Dec 2020 09:10:28 -0500 Subject: [PATCH] use -mcpu= avoiding -march and -mtune for armv7h From what I understand, when building on ARM, it's best to avoid the -march= flag and rather use -mcpu= flag due to differences in meaning on ARM vs x86[1]. Additionally, this patch avoids thousands of warns like the following when building for armv7h: cc1: warning: switch '-mcpu=cortex-a72' conflicts with '-march=armv8-a' This is due to the way ffmpeg's configure script defines -march=armv8-a when it encounters any cortex-a* passed to it. for reference and to experiment: untar ffmpeg, run ./configure, then inspect the output of ffbuild/config.mak and adjust: kodi-build/build/ffmpeg/src/ffmpeg-build/ffmpeg-prefix/src/ffmpeg-build/ffbuild/config.mak 1. https://community.arm.com/developer/tools-software/tools/b/tools-software-ides-blog/posts/compiler-flags-across-architectures-march-mtune-and-mcpu --- configure | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/configure b/configure index 8569a60..0d3aafb 100755 --- a/configure +++ b/configure @@ -4948,7 +4948,7 @@ elif enabled arm; then case $cpu in armv*) - cpuflags="-march=$cpu" + cpuflags="-mcpu=cortex-a53" subarch=$(echo $cpu | sed 's/[^a-z0-9]//g') ;; *) -- 2.29.2