bpo-35351: Pass link time optimization flags to CFLAGS_NODIST (GH-10797)
When using link time optimizations, the -flto flag is passed to
BASECFLAGS, which makes it propagate to distutils. Those flags
should be reserved for the interpreter and the stdlib extension
modules only, thus moving those flags to CFLAGS_NODIST.
diff --git a/Misc/NEWS.d/next/Build/2018-12-04-15-33-28.bpo-35351.ZhhBfT.rst b/Misc/NEWS.d/next/Build/2018-12-04-15-33-28.bpo-35351.ZhhBfT.rst
new file mode 100644
index 0000000..ee6c870
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2018-12-04-15-33-28.bpo-35351.ZhhBfT.rst
@@ -0,0 +1,2 @@
+When building Python with clang and LTO, LTO flags are no longer passed into
+CFLAGS to build third-party C extensions through distutils.
diff --git a/configure b/configure
index e9e33b3..8d33363 100755
--- a/configure
+++ b/configure
@@ -6626,7 +6626,7 @@
LTOFLAGS="$LTOFLAGS -g"
fi
- BASECFLAGS="$BASECFLAGS $LTOFLAGS"
+ CFLAGS_NODIST="$CFLAGS_NODIST $LTOFLAGS"
LDFLAGS="$LDFLAGS $LTOFLAGS"
fi
diff --git a/configure.ac b/configure.ac
index 15d03ba..5c1c021 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1357,7 +1357,7 @@
LTOFLAGS="$LTOFLAGS -g"
fi
- BASECFLAGS="$BASECFLAGS $LTOFLAGS"
+ CFLAGS_NODIST="$CFLAGS_NODIST $LTOFLAGS"
LDFLAGS="$LDFLAGS $LTOFLAGS"
fi