add lto bcond for building with link time optimization

diff --git a/firefox.spec b/firefox.spec
index a857d79f07a0fc882f2d37fd4c858e776bf9ffea..98fccb0f44465242726b78996eb25b81e353b864 100644 (file)
--- a/firefox.spec
+++ b/firefox.spec
@@ -6,6 +6,7 @@
 %bcond_with    tests           # enable tests (whatever they check)
 %bcond_without kerberos        # disable krb5 support
 %bcond_without official        # official Firefox branding
+%bcond_with    lto             # build with link time optimization
 %bcond_with    pgo             # PGO-enabled build (requires working $DISPLAY == :100)
 %bcond_without geckodriver     # WebDriver
 %bcond_without gold            # use default linker instead of gold
@@ -16,6 +17,10 @@
 %bcond_with    clang           # build using Clang/LLVM
 %bcond_with    legacy_exts     # build with legacy extensions support
 
+%if %{with lto}
+%define                with_clang      1
+%undefine      with_gold
+%endif
 # On updating version, grab CVE links from:
 # https://www.mozilla.org/security/known-vulnerabilities/firefox.html
 # Release Notes:
@@ -282,6 +287,7 @@ BuildRequires:      libpng(APNG)-devel >= 0.10
 BuildRequires: libpng-devel >= 2:1.6.34
 BuildRequires: libstdc++-devel >= 6:4.4
 BuildRequires: libvpx-devel >= 1.5.0
+%{?with_lto:BuildRequires:     lld}
 BuildRequires: llvm-devel
 BuildRequires: nspr-devel >= 1:%{nspr_ver}
 BuildRequires: nss-devel >= 1:%{nss_ver}
@@ -2086,6 +2092,12 @@ ac_add_options --enable-default-toolkit=cairo-gtk3
 ac_add_options --enable-extensions=default
 %{?with_geckodriver:ac_add_options --enable-geckodriver}
 %{?with_gold:ac_add_options --enable-linker=gold}
+%if %{with lto}
+ac_add_options --disable-elf-hack
+ac_add_options --enable-lto
+%else
+ac_add_options --enable-elf-hack
+%endif
 ac_add_options --enable-readline
 %{?with_shared_js:ac_add_options --enable-shared-js}
 ac_add_options --enable-startup-notification