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[build] Use separate code segment if supported by linker

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Some versions of ld will complain that the automatically created (and
unused by our build process) ELF program headers include a "LOAD
segment with RWX permissions".

Silence this warning by adding "-z separate-code" to the linker
options, where supported.

For BIOS builds, where the prefix will generally require writable
access to its own (tiny) code segment, simply inhibit the warning
completely via "--no-warn-rwx-segments".

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2023-06-30 12:03:41 +01:00
parent e17568ad06
commit 6f57d91935
2 changed files with 14 additions and 0 deletions
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7
src/Makefile.housekeeping
View File

@@ -502,6 +502,13 @@ LDFLAGS += --gc-sections
# #
LDFLAGS += -static LDFLAGS += -static
# Use separate code segment if supported by linker
#
ZSC_TEST = $(LD) -z separate-code --version 2>&1 > /dev/null
ZSC_FLAGS := $(shell [ -z "`$(ZSC_TEST)`" ] && \
$(ECHO) '-z separate-code -z max-page-size=4096')
LDFLAGS += $(ZSC_FLAGS)
# compiler.h is needed for our linking and debugging system # compiler.h is needed for our linking and debugging system
# #
CFLAGS += -include include/compiler.h CFLAGS += -include include/compiler.h

7
src/arch/x86/Makefile.pcbios
View File

@@ -13,6 +13,13 @@ LDSCRIPT_PREFIX = arch/x86/scripts/prefixonly.lds
# #
LDFLAGS += -N --no-check-sections LDFLAGS += -N --no-check-sections
# Do not warn about RWX segments (required by most prefixes)
#
WRWX_TEST = $(LD) --warn-rwx-segments --version 2>&1 > /dev/null
WRWX_FLAGS := $(shell [ -z "`$(WRWX_TEST)`" ] && \
$(ECHO) '--no-warn-rwx-segments')
LDFLAGS += $(WRWX_FLAGS)
# Media types. # Media types.
# #
MEDIA += rom MEDIA += rom