This patch allows to compile QEMU with link-time optimization (LTO).
Compilation with LTO is handled directly by meson. This patch only
adds the option in configure and forwards the request to meson
Tested with all major versions of clang from 6 to 12
Signed-off-by: Daniele Buono <dbu...@linux.vnet.ibm.com>
---
configure | 7 +++++++
meson.build | 1 +
2 files changed, 8 insertions(+)
diff --git a/configure b/configure
index 2c3c69f118..7115655fe4 100755
--- a/configure
+++ b/configure
@@ -242,6 +242,7 @@ host_cc="cc"
audio_win_int=""
libs_qga=""
debug_info="yes"
+lto="false"
stack_protector=""
safe_stack=""
use_containers="yes"
@@ -1166,6 +1167,10 @@ for opt do
;;
--disable-werror) werror="no"
;;
+ --enable-lto) lto="true"
+ ;;
+ --disable-lto) lto="false"
+ ;;
--enable-stack-protector) stack_protector="yes"
;;
--disable-stack-protector) stack_protector="no"
@@ -1744,6 +1749,7 @@ disabled with --disable-FEATURE, default is enabled if
available:
module-upgrades try to load modules from alternate paths for upgrades
debug-tcg TCG debugging (default is disabled)
debug-info debugging information
+ lto Enable Link-Time Optimization.
sparse sparse checker
safe-stack SafeStack Stack Smash Protection. Depends on
clang/llvm >= 3.7 and requires coroutine backend ucontext.
@@ -6991,6 +6997,7 @@ NINJA=$ninja $meson setup \
-Dcapstone=$capstone -Dslirp=$slirp -Dfdt=$fdt \
-Diconv=$iconv -Dcurses=$curses -Dlibudev=$libudev\
-Ddocs=$docs -Dsphinx_build=$sphinx_build -Dinstall_blobs=$blobs \
+ -Db_lto=$lto \
$cross_arg \
"$PWD" "$source_path"
diff --git a/meson.build b/meson.build
index 39ac5cf6d8..99c7ab1d38 100644
--- a/meson.build
+++ b/meson.build
@@ -2023,6 +2023,7 @@ summary_info += {'gprof enabled':
config_host.has_key('CONFIG_GPROF')}
summary_info += {'sparse enabled': sparse.found()}
summary_info += {'strip binaries': get_option('strip')}
summary_info += {'profiler': config_host.has_key('CONFIG_PROFILER')}
+summary_info += {'link-time optimization (LTO)': get_option('b_lto')}
summary_info += {'static build': config_host.has_key('CONFIG_STATIC')}
if targetos == 'darwin'
summary_info += {'Cocoa support': config_host.has_key('CONFIG_COCOA')}
--
2.17.1
