configure,meson: add option to enable LTO
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 <dbuono@linux.vnet.ibm.com>
Message-Id: <20201204230615.2392-2-dbuono@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/configure b/configure
index 8ef0874..b6fb188 100755
--- a/configure
+++ b/configure
@@ -242,6 +242,7 @@
audio_win_int=""
libs_qga=""
debug_info="yes"
+lto="false"
stack_protector=""
safe_stack=""
use_containers="yes"
@@ -1182,6 +1183,10 @@
;;
--disable-werror) werror="no"
;;
+ --enable-lto) lto="true"
+ ;;
+ --disable-lto) lto="false"
+ ;;
--enable-stack-protector) stack_protector="yes"
;;
--disable-stack-protector) stack_protector="no"
@@ -1779,6 +1784,7 @@
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.
@@ -6965,6 +6971,7 @@
-Db_pie=$(if test "$pie" = yes; then echo true; else echo false; fi) \
${staticpic:+-Db_staticpic=$staticpic} \
-Db_coverage=$(if test "$gcov" = yes; then echo true; else echo false; fi) \
+ -Db_lto=$lto \
-Dmalloc=$malloc -Dmalloc_trim=$malloc_trim -Dsparse=$sparse \
-Dkvm=$kvm -Dhax=$hax -Dwhpx=$whpx -Dhvf=$hvf \
-Dxen=$xen -Dxen_pci_passthrough=$xen_pci_passthrough -Dtcg=$tcg \
diff --git a/meson.build b/meson.build
index 372576f..d05d880 100644
--- a/meson.build
+++ b/meson.build
@@ -2080,6 +2080,7 @@
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')}
