From 7faf8eda1358f8a877b9b3d6e1197b814e80b50b Mon Sep 17 00:00:00 2001
Message-Id: <7faf8eda1358f8a877b9b3d6e1197b814e80b50b.1566557361.git.pmatilai@redhat.com>
From: Panu Matilainen <pmatilai@redhat.com>
Date: Tue, 13 Aug 2019 16:26:31 +0300
Subject: [PATCH] Drop %_lto_cflags macro afterall

This was only added in commit 2bb7b0cf066c97a9d92eb0bf59618896000cb29d,
but turns out that this kind of usage is bad for build reproducability
because the system-specific CPU count gets recorded RPMTAG_OPTFLAGS
and the resulting binaries too (depending on gcc flags).
In addition, gcc upstream has decided to make -flto default to
autodetected parallelism. Since -flto can be overridden with
by simply appending -fno-lto for the packages that need to disable it,
there's no practical need for us to provide such a macro for disabling
either.
---
 macros.in   | 2 +-
 platform.in | 3 ---
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/macros.in b/macros.in
index 633d5ca6e..b7da4ea2f 100644
--- a/macros.in
+++ b/macros.in
@@ -1025,7 +1025,7 @@ package or when debugging this package.\
 %build_fflags %{optflags} %{?_fmoddir:-I%{_fmoddir}}
 
 # Link editor flags.  This is usually called LDFLAGS in makefiles.
-#%build_ldflags -Wl,-z,relro %{?_lto_cflags}
+#%build_ldflags -Wl,-z,relro
 
 # Expands to shell code to seot the compiler/linker environment
 # variables CFLAGS, CXXFLAGS, FFLAGS, FCFLAGS, LDFLAGS if they have
diff --git a/platform.in b/platform.in
index e1efc42b0..db6d2382f 100644
--- a/platform.in
+++ b/platform.in
@@ -59,9 +59,6 @@
 
 %_smp_mflags -j%{_smp_build_ncpus}
 
-# Enable LTO optimization with a maximal parallelism
-%_lto_cflags -flto=%{_smp_build_ncpus}
-
 #==============================================================================
 # ---- Build policy macros.
 #
-- 
2.21.0