The commit "ada: Add PIE support to backtraces on Linux" [1] use _r_debug under Linux unconditionally. It is incorrect since musl[2] libc not defined _r_debug like glibc [3]:
extern struct r_debug _r_debug; As far as I know, only glibc and uClibc [4] define the global variable _r_debug. [1] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=f2b30a724e6bf7ff8e591b176967d596cee7648e;hp=83e8d37fe39d7c1afce19b61bbc2dd828fa37c6f [2] https://git.musl-libc.org/cgit/musl/tree/include/link.h#n39 [3] https://sourceware.org/git/?p=glibc.git;a=blob;f=elf/link.h;h=3b5954d9818e8ea9f35638c55961f861f6ae6057;hb=HEAD#l66 [4] https://git.uclibc.org/uClibc/tree/include/link.h#n71 OK? Bootstrapped and tested on aarch64-linux-(gnu|musl), riscv64-linux-(gnu|musl) and x86_64-linux-(gnu|musl) with no regressions. gcc/ada/ * adaint.c [Linux]: Include <features.h>. (__gnat_get_executable_load_address) [Linux]: Enable only for glibc & uClibc on Linux. gcc/ada/adaint.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/gcc/ada/adaint.c b/gcc/ada/adaint.c index 1c23d1584..852209416 100644 --- a/gcc/ada/adaint.c +++ b/gcc/ada/adaint.c @@ -3526,6 +3526,7 @@ __gnat_cpu_set (int cpu, size_t count ATTRIBUTE_UNUSED, cpu_set_t *set) #if defined (__APPLE__) #include <mach-o/dyld.h> #elif defined (__linux__) +#include <features.h> #include <link.h> #endif @@ -3535,7 +3536,7 @@ __gnat_get_executable_load_address (void) #if defined (__APPLE__) return _dyld_get_image_header (0); -#elif defined (__linux__) +#elif defined (__linux__) && (defined (__GLIBC__) || defined (__UCLIBC__)) struct link_map *map = _r_debug.r_map; return (const void *)map->l_addr;
