[PATCH v4 0/1] Enable Dead Code Elimination

[Kele Zhang]

This patch enables `--gc-sections`. Dead Code Elimination (DCE) can
reduce binary size and the attack surface without introducing side
effects, and it has been used in the Linux kernel for many years.

After testing, enabling DCE does not affect the normal functionality of
OpenSBI.

---
v1: https://lists.infradead.org/pipermail/opensbi/2024-August/007286.html
v2: https://lists.infradead.org/pipermail/opensbi/2024-August/007301.html
v3: https://lists.infradead.org/pipermail/opensbi/2024-September/007344.html
---
Changes in v2:
- Move --gc-sections to ELFFLAGS
- Remove redundant KEEP()

Changes in v3:
- Move --print-gc-sections to ifneq ($(DEBUG),)
- Move "ifneq ($(DEBUG),)" to the latter part of the Makefile, ensuring
that "ELFFLAGS  +=      $(USE_LD_FLAG)" remains at the beginning.

Changes in v4:
- fix: replace spaces with tabs for consistent indentation
---

Kele Zhang (1):
  Makefile: enable --gc-sections

 Makefile             | 15 +++++++++------
 firmware/fw_base.ldS |  1 +
 2 files changed, 10 insertions(+), 6 deletions(-)

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2.43.0