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BUILD: tools: fix build with static only toolchains

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uClibc toolchains built with no dynamic library support don't provide
the dlfcn.h header. That leads to build failure:

  CC      src/tools.o
src/tools.c:15:10: fatal error: dlfcn.h: No such file or directory
 #include <dlfcn.h>
          ^~~~~~~~~
Enable dladdr on Linux platforms only when USE_DL is defined.

This should be backported wherever 109201fc5 ("BUILD: tools: rely on
__ELF__ not USE_DL to enable use of dladdr()") is backported (currently
only 2.2 and 2.1).
This commit is contained in:
Baruch Siach 2020-07-24 07:52:20 +03:00 committed by Willy Tarreau
parent 0f17a4444e
commit e1651b2970
1 changed files with 6 additions and 6 deletions
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12
src/tools.c
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@ -10,7 +10,7 @@
*
*/
#ifdef __ELF__
#if (defined(__ELF__) && !defined(__linux__)) || defined(USE_DL)
#define _GNU_SOURCE
#include <dlfcn.h>
#include <link.h>
@ -4410,7 +4410,7 @@ const char *get_exec_path()
return ret;
}
#ifdef __ELF__
#if (defined(__ELF__) && !defined(__linux__)) || defined(USE_DL)
/* calls dladdr() or dladdr1() on <addr> and <dli>. If dladdr1 is available,
* also returns the symbol size in <size>, otherwise returns 0 there.
*/
@ -4444,7 +4444,7 @@ static int dladdr_and_size(const void *addr, Dl_info *dli, size_t *size)
* The file name (lib or executable) is limited to what lies between the last
* '/' and the first following '.'. An optional prefix <pfx> is prepended before
* the output if not null. The file is not dumped when it's the same as the one
* that contains the "main" symbol, or when __ELF__ is not set.
* that contains the "main" symbol, or when __ELF__ && USE_DL are not set.
*
* The symbol's base address is returned, or NULL when unresolved, in order to
* allow the caller to match it against known ones.
@ -4472,7 +4472,7 @@ const void *resolve_sym_name(struct buffer *buf, const char *pfx, void *addr)
#endif
};
#ifdef __ELF__
#if (defined(__ELF__) && !defined(__linux__)) || defined(USE_DL)
Dl_info dli, dli_main;
size_t size;
const char *fname, *p;
@ -4489,7 +4489,7 @@ const void *resolve_sym_name(struct buffer *buf, const char *pfx, void *addr)
}
}
#ifdef __ELF__
#if (defined(__ELF__) && !defined(__linux__)) || defined(USE_DL)
/* Now let's try to be smarter */
if (!dladdr_and_size(addr, &dli, &size))
goto unknown;
@ -4529,7 +4529,7 @@ const void *resolve_sym_name(struct buffer *buf, const char *pfx, void *addr)
chunk_appendf(buf, "+%#lx", (long)(addr - dli.dli_fbase));
return NULL;
}
#endif /* __ELF__ */
#endif /* __ELF__ && !__linux__ || USE_DL */
unknown:
/* unresolved symbol from the main file, report relative offset to main */
if ((void*)addr < (void*)main)