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dwarf: don't emit a dummy .debug_loc section

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It seems DWARF parsers get really snippy about a section which only
contains an end token. Instead, leave unused sections empty. Already
did that with .debug_frame, do it with .debug_loc too.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin (Intel) 2020-06-26 15:22:26 -07:00
parent 241697306c
commit eb571a3ac3
1 changed files with 16 additions and 14 deletions
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30
output/outelf.c
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@ -3438,29 +3438,31 @@ static void dwarf_generate(void)
saa_rnbytes(plinesrel, pbuf, saalen);
saa_free(plinesrel);
/* build frame section */
/* build .debug_frame section */
if (0) {
/* This only applies if there is at least one frame defined */
framelen = 4;
framebuf = pbuf = nasm_malloc(framelen);
WRITELONG(pbuf,framelen-4); /* initial length */
} else {
/* Leave .debug_frame empty if not used! */
framelen = 0;
}
/* build loc section */
loclen = 16;
locbuf = pbuf = nasm_malloc(loclen);
if (is_elf32()) {
WRITELONG(pbuf,0); /* null beginning offset */
WRITELONG(pbuf,0); /* null ending offset */
} else if (is_elfx32()) {
WRITELONG(pbuf,0); /* null beginning offset */
WRITELONG(pbuf,0); /* null ending offset */
/* build .debug_loc section */
if (0) {
loclen = 16;
locbuf = pbuf = nasm_malloc(loclen);
if (is_elf32() || is_elfx32()) {
WRITELONG(pbuf,0); /* null beginning offset */
WRITELONG(pbuf,0); /* null ending offset */
} else {
nasm_assert(is_elf64());
WRITEDLONG(pbuf,0); /* null beginning offset */
WRITEDLONG(pbuf,0); /* null ending offset */
}
} else {
nasm_assert(is_elf64());
WRITEDLONG(pbuf,0); /* null beginning offset */
WRITEDLONG(pbuf,0); /* null ending offset */
/* Leave .debug_frame empty if not used! */
loclen = 0;
}
}