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[build] Eliminate unused sections at link-time

Use -ffunction-sections, -fdata-sections, and --gc-sections to
automatically prune out any unreferenced sections.

This saves around 744 bytes (uncompressed) from the rtl8139.rom build.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 13 anos atrás
pai
commit
623469de5d

+ 13
- 0
src/Makefile.housekeeping Ver arquivo

@@ -415,6 +415,19 @@ CFLAGS		+= -finstrument-functions
415 415
 CFLAGS		+= -finstrument-functions-exclude-file-list=core/fnrec.c
416 416
 endif
417 417
 
418
+# Enable per-item sections and section garbage collection.  Note that
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+# some older versions of gcc support -fdata-sections but treat it as
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+# implying -fno-common, which would break our build.
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+#
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+ifeq ($(CCTYPE),gcc)
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+DS_TEST		= $(ECHO) 'char x;' | \
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+		  $(CC) -fdata-sections -S -x c - -o - 2>/dev/null | \
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+		  grep -E '\.comm' > /dev/null
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+DS_FLAGS	:= $(shell $(DS_TEST) && $(ECHO) '-fdata-sections')
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+CFLAGS		+= -ffunction-sections $(DS_FLAGS)
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+endif
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+LDFLAGS		+= --gc-sections
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+
418 431
 # compiler.h is needed for our linking and debugging system
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 #
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 CFLAGS		+= -include compiler.h

+ 6
- 2
src/arch/i386/scripts/i386-kir.lds Ver arquivo

@@ -68,7 +68,8 @@ SECTIONS {
68 68
 
69 69
     .text16 : AT ( _text16_load_offset + __text16 ) {
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 	__text16 = .;
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-	*(.text.null_trap)
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+	KEEP(*(.text.null_trap))
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+	KEEP(*(.text.null_trap.*))
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 	*(.text16)
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 	*(.text16.*)
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 	*(.text)
@@ -97,7 +98,7 @@ SECTIONS {
97 98
 	*(.data16.*)
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 	*(.data)
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 	*(.data.*)
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-	*(SORT(.tbl.*))		/* Various tables.  See include/tables.h */
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+	KEEP(*(SORT(.tbl.*)))	/* Various tables.  See include/tables.h */
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 	_edata16_progbits = .;
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     }
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     .bss16 : AT ( _data16_load_offset + __bss16 ) {
@@ -129,8 +130,11 @@ SECTIONS {
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     /DISCARD/ : {
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 	*(.comment)
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+	*(.comment.*)
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 	*(.note)
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+	*(.note.*)
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 	*(.discard)
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+	*(.discard.*)
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     }
135 139
 
136 140
     /*

+ 9
- 5
src/arch/i386/scripts/i386.lds Ver arquivo

@@ -49,7 +49,8 @@ SECTIONS {
49 49
 
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     .text16.early 0x0 : AT ( _text16_early_lma ) {
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 	_text16 = .;
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-	*(.text16.null)
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+	KEEP(*(.text16.null))
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+	KEEP(*(.text16.null.*))
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 	. += 1;				/* Prevent NULL being valid */
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 	*(.text16.early)
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 	*(.text16.early.*)
@@ -98,7 +99,8 @@ SECTIONS {
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     .textdata 0x0 : AT ( _textdata_lma ) {
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 	_textdata = .;
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-	*(.text.null_trap)
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+	KEEP(*(.text.null_trap))
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+	KEEP(*(.text.null_trap.*))
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 	. += 1;				/* Prevent NULL being valid */
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 	*(.text)
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 	*(.text.*)
@@ -106,7 +108,7 @@ SECTIONS {
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 	*(.rodata.*)
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 	*(.data)
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 	*(.data.*)
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-	*(SORT(.tbl.*))		/* Various tables.  See include/tables.h */
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+	KEEP(*(SORT(.tbl.*)))	/* Various tables.  See include/tables.h */
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 	_mtextdata = .;
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     } .bss.textdata (NOLOAD) : AT ( _end_lma ) {
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 	*(.bss)
@@ -126,8 +128,8 @@ SECTIONS {
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     .zinfo 0x0 : AT ( _zinfo_lma ) {
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 	_zinfo = .;
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-	*(.zinfo)
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-	*(.zinfo.*)
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+	KEEP(*(.zinfo))
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+	KEEP(*(.zinfo.*))
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 	_mzinfo = .;
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     } .bss.zinfo (NOLOAD) : AT ( _end_lma ) {
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 	_ezinfo = .;
@@ -143,6 +145,7 @@ SECTIONS {
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     .weak 0x0 : AT ( _end_lma ) {
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 	_weak = .;
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 	*(.weak)
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+	*(.weak.*)
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 	_eweak = .;
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     }
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     _assert = ASSERT ( ( _weak == _eweak ), ".weak is non-zero length" );
@@ -165,6 +168,7 @@ SECTIONS {
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 	*(.einfo)
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 	*(.einfo.*)
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 	*(.discard)
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+	*(.discard.*)
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     }
169 173
 
170 174
     /*

+ 3
- 1
src/arch/i386/scripts/linux.lds Ver arquivo

@@ -51,7 +51,7 @@ SECTIONS {
51 51
 		_data = .;
52 52
 		*(.data)
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 		*(.data.*)
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-		*(SORT(.tbl.*))		/* Various tables.  See include/tables.h */
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+		KEEP(*(SORT(.tbl.*)))
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 		_edata = .;
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 	}
57 57
 
@@ -77,6 +77,7 @@ SECTIONS {
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 	.weak 0x0 : {
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 		_weak = .;
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 		*(.weak)
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+		*(.weak.*)
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 		_eweak = .;
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 	}
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 	_assert = ASSERT ( ( _weak == _eweak ), ".weak is non-zero length" );
@@ -97,5 +98,6 @@ SECTIONS {
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 		*(.rel)
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 		*(.rel.*)
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 		*(.discard)
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+		*(.discard.*)
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 	}
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 }

+ 3
- 1
src/arch/x86/scripts/efi.lds Ver arquivo

@@ -54,7 +54,7 @@ SECTIONS {
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 	_data = .;
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 	*(.data)
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 	*(.data.*)
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-	*(SORT(.tbl.*))		/* Various tables.  See include/tables.h */
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+	KEEP(*(SORT(.tbl.*)))	/* Various tables.  See include/tables.h */
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 	_edata = .;
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     }
60 60
 
@@ -80,6 +80,7 @@ SECTIONS {
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     .weak 0x0 : {
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 	_weak = .;
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 	*(.weak)
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+	*(.weak.*)
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 	_eweak = .;
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     }
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     _assert = ASSERT ( ( _weak == _eweak ), ".weak is non-zero length" );
@@ -102,5 +103,6 @@ SECTIONS {
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 	*(.einfo)
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 	*(.einfo.*)
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 	*(.discard)
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+	*(.discard.*)
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     }
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 }

+ 3
- 1
src/arch/x86_64/scripts/linux.lds Ver arquivo

@@ -51,7 +51,7 @@ SECTIONS {
51 51
 		_data = .;
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 		*(.data)
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 		*(.data.*)
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-		*(SORT(.tbl.*))		/* Various tables.  See include/tables.h */
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+		KEEP(*(SORT(.tbl.*)))
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 		_edata = .;
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 	}
57 57
 
@@ -77,6 +77,7 @@ SECTIONS {
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 	.weak 0x0 : {
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 		_weak = .;
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 		*(.weak)
80
+		*(.weak.*)
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 		_eweak = .;
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 	}
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 	_assert = ASSERT ( ( _weak == _eweak ), ".weak is non-zero length" );
@@ -97,5 +98,6 @@ SECTIONS {
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 		*(.rel)
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 		*(.rel.*)
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 		*(.discard)
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+		*(.discard.*)
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 	}
101 103
 }

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