configure: Add separate --enable-lto knob

tavianator · Feb 13, 2025 · 03f2e4d · 03f2e4d
1 parent 000d4a2
commit 03f2e4d
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Showing 2 changed files with 9 additions and 3 deletions.
diff --git a/build/flags.mk b/build/flags.mk
@@ -30,6 +30,9 @@ _GCOV := ${TRUTHY,${GCOV}}
 _LINT := ${TRUTHY,${LINT}}
 _RELEASE := ${TRUTHY,${RELEASE}}
 
+LTO ?= ${RELEASE}
+_LTO := ${TRUTHY,${LTO}}
+
 ASAN_CFLAGS,y := -fsanitize=address
 LSAN_CFLAGS,y := -fsanitize=leak
 MSAN_CFLAGS,y := -fsanitize=memory -fsanitize-memory-track-origins
@@ -62,11 +65,14 @@ _CPPFLAGS += ${LINT_CPPFLAGS,${_LINT}}
 _CFLAGS += ${LINT_CFLAGS,${_LINT}}
 
 RELEASE_CPPFLAGS,y := -DNDEBUG
-RELEASE_CFLAGS,y := -O3 -flto=auto
+RELEASE_CFLAGS,y := -O3
 
 _CPPFLAGS += ${RELEASE_CPPFLAGS,${_RELEASE}}
 _CFLAGS += ${RELEASE_CFLAGS,${_RELEASE}}
 
+LTO_CFLAGS,y := -flto=auto
+_CFLAGS += ${LTO_CFLAGS,${_LTO}}
+
 # Configurable flags
 CFLAGS ?= -g -Wall
 

diff --git a/configure b/configure
@@ -164,7 +164,7 @@ for arg; do
 
         --enable-*|--disable-*)
             case "$name" in
-                release|asan|lsan|msan|tsan|ubsan|lint|gcov)
+                release|lto|asan|lsan|msan|tsan|ubsan|lint|gcov)
                     set -- "$@" "$NAME=$yn"
                     ;;
                 *)
@@ -197,7 +197,7 @@ for arg; do
             ;;
 
         # Warn about MAKE variables that have documented configure flags
-        RELEASE=*|ASAN=*|LSAN=*|MSAN=*|TSAN=*|UBSAN=*|LINT=*|GCOV=*)
+        RELEASE=*|LTO=*|ASAN=*|LSAN=*|MSAN=*|TSAN=*|UBSAN=*|LINT=*|GCOV=*)
             name=$(printf '%s' "$NAME" | tr 'A-Z_' 'a-z-')
             warn '"%s" is deprecated; use --enable-%s' "$arg" "$name"
             set -- "$@" "$arg"