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build: allow platform makefiles to configure ENABLE_LTO

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This change introduces a lazily-evaluated condition on `ENABLE_LTO` to
the `LTO_CFLAGS` variable as opposed to evaluating the condition
eagerly.

This concludes a recent request on the mailing list:

    https://lists.trustedfirmware.org/archives/list/tf-a@lists.trustedfirmware.org/thread/EU3XR4VB3RP2NQB372QPZ4VRP57ANNLC/

Change-Id: Ie1f73352eb51fb2ceb2385232336312216ef87fc
Signed-off-by: Chris Kay <chris.kay@arm.com>
This commit is contained in:
Chris Kay 2024-02-20 16:19:54 +00:00
parent 77ca4f7935
commit fa402f38b2
1 changed files with 3 additions and 5 deletions
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Makefile
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@ -155,11 +155,9 @@ ifneq ($(filter %-clang,$($(ARCH)-cc-id)),)
endif endif
else ifeq ($($(ARCH)-cc-id),gnu-gcc) else ifeq ($($(ARCH)-cc-id),gnu-gcc)
ifeq ($(ENABLE_LTO),1)
# Enable LTO only for aarch64 # Enable LTO only for aarch64
ifeq (${ARCH},aarch64) ifeq (${ARCH},aarch64)
LTO_CFLAGS = -flto LTO_CFLAGS = $(if $(filter-out 0,$(ENABLE_LTO)),-flto)
endif
endif endif
endif #(clang) endif #(clang)