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libCom: detect support for backtrace() with __has_include.

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This is necessary in order to build epics-base with musl libc, for
example, and any other C libraries which don't include this
functionality. In order to not regress builds with older compilers, we
still support the uclibc check. Furthermore, it has been checked that
uclibc-ng (the maintained version of uclibc) doesn't install the
<execinfo.h> header when the functionality is disabled [1] [2].

To avoid repetition, we don't define HAS_EXECINFO to 0 when it is not
available.

[1] https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/tree/Makefile.in?id=cdb07d2cd52af39feb425e6d36c02b30916b9f0a#n224
[2] https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/tree/Makefile.in?id=cdb07d2cd52af39feb425e6d36c02b30916b9f0a#n277
This commit is contained in:
Érico Nogueira
2023-07-31 11:36:11 -03:00
committed by Dirk Zimoch
parent 42dfca2b54
commit 49b9573f3a
1 changed files with 6 additions and 3 deletions
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9
modules/libcom/src/osi/os/posix/osdExecinfoBackTrace.cpp
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@@ -12,10 +12,13 @@
#include <stdlib.h>
// execinfo.h may not be present if uclibc is configured to omit backtrace()
#if !defined(__UCLIBC_MAJOR__) || defined(__UCLIBC_HAS_EXECINFO__)
// some C libraries, such as musl, don't have execinfo.h at all
#if defined(__has_include)
# if __has_include(<execinfo.h>)
# define HAS_EXECINFO 1
# endif
#elif !defined(__UCLIBC_MAJOR__) || defined(__UCLIBC_HAS_EXECINFO__)
# define HAS_EXECINFO 1
#else
# define HAS_EXECINFO 0
#endif
#if HAS_EXECINFO