some newer systems have debug sections compressed by default, which includes those in the crt[1in].o startup files. These can't simply be concatenated like all others (which leads to invalid section contents ultimately making gdb fail) but need special handling. Instead of that special handling (decompressing, which in turn requires linking against zlib) let's just ignore such sections, even though that means to also ignore all other debug sections from that particular input file. Our own generated files of course don't have the problem.
Unified · Split
| @@ -376,6 +376,7 @@ typedef struct · 375 unmodified lines | ||
| 376 | 376 | required */ |
| 377 | 377 | #define SHF_GROUP (1 << 9) /* Section is member of a group. */ |
| 378 | 378 | #define SHF_TLS (1 << 10) /* Section hold thread-local data. */ |
| 379 | +#define SHF_COMPRESSED (1 << 11) /* Section with compressed data. */ | |
| 379 | 380 | #define SHF_MASKOS 0x0ff00000 /* OS-specific. */ |
| 380 | 381 | #define SHF_MASKPROC 0xf0000000 /* Processor-specific */ |
| 381 | 382 | #define SHF_ORDERED (1 << 30) /* Special ordering requirement |
| @@ -2194,7 +2194,7 @@ ST_FUNC int tcc_load_object_file(TCCState *s1, · 2193 unmodified lines | ||
| 2194 | 2194 | { |
| 2195 | 2195 | ElfW(Ehdr) ehdr; |
| 2196 | 2196 | ElfW(Shdr) *shdr, *sh; |
| 2197 | − int size, i, j, offset, offseti, nb_syms, sym_index, ret; | |
| 2197 | + int size, i, j, offset, offseti, nb_syms, sym_index, ret, seencompressed; | |
| 2198 | 2198 | unsigned char *strsec, *strtab; |
| 2199 | 2199 | int *old_to_new_syms; |
| 2200 | 2200 | char *sh_name, *name; |
| @@ -2232,6 +2232,7 @@ ST_FUNC int tcc_load_object_file(TCCState *s1, · 31 unmodified lines | ||
| 2232 | 2232 | symtab = NULL; |
| 2233 | 2233 | strtab = NULL; |
| 2234 | 2234 | nb_syms = 0; |
| 2235 | + seencompressed = 0; | |
| 2235 | 2236 | for(i = 1; i < ehdr.e_shnum; i++) { |
| 2236 | 2237 | sh = &shdr[i]; |
| 2237 | 2238 | if (sh->sh_type == SHT_SYMTAB) { |
| @@ -2249,6 +2250,8 @@ ST_FUNC int tcc_load_object_file(TCCState *s1, · 11 unmodified lines | ||
| 2249 | 2250 | sh = &shdr[sh->sh_link]; |
| 2250 | 2251 | strtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size); |
| 2251 | 2252 | } |
| 2253 | + if (sh->sh_flags & SHF_COMPRESSED) | |
| 2254 | + seencompressed = 1; | |
| 2252 | 2255 | } |
| 2253 | 2256 | |
| 2254 | 2257 | /* now examine each section and try to merge its content with the |
| @@ -2272,6 +2275,12 @@ ST_FUNC int tcc_load_object_file(TCCState *s1, · 17 unmodified lines | ||
| 2272 | 2275 | strcmp(sh_name, ".stabstr") |
| 2273 | 2276 | ) |
| 2274 | 2277 | continue; |
| 2278 | + if (seencompressed | |
| 2279 | + && (!strncmp(sh_name, ".debug_", sizeof(".debug_")-1) | |
| 2280 | + || (sh->sh_type == SHT_RELX | |
| 2281 | + && !strncmp((char*)strsec + shdr[sh->sh_info].sh_name, | |
| 2282 | + ".debug_", sizeof(".debug_")-1)))) | |
| 2283 | + continue; | |
| 2275 | 2284 | if (sh->sh_addralign < 1) |
| 2276 | 2285 | sh->sh_addralign = 1; |
| 2277 | 2286 | /* find corresponding section, if any */ |