diff options
Diffstat (limited to 'm4/pc_from_ucontext.m4')
| -rw-r--r-- | m4/pc_from_ucontext.m4 | 33 |
1 files changed, 24 insertions, 9 deletions
diff --git a/m4/pc_from_ucontext.m4 b/m4/pc_from_ucontext.m4 index 8c4c5ce..daffddb 100644 --- a/m4/pc_from_ucontext.m4 +++ b/m4/pc_from_ucontext.m4 @@ -6,8 +6,13 @@ # OpenBSD doesn't have ucontext.h, but we can get PC from ucontext_t # by using signal.h. +# The first argument of AC_PC_FROM_UCONTEXT will be invoked when we +# cannot find a way to obtain PC from ucontext. + AC_DEFUN([AC_PC_FROM_UCONTEXT], - [AC_MSG_CHECKING([how to access the program counter from a struct ucontext]) + [AC_CHECK_HEADERS(ucontext.h) + AC_CHECK_HEADERS(sys/ucontext.h) # ucontext on OS X 10.6 (at least) + AC_MSG_CHECKING([how to access the program counter from a struct ucontext]) pc_fields=" uc_mcontext.gregs[[REG_PC]]" # Solaris x86 (32 + 64 bit) pc_fields="$pc_fields uc_mcontext.gregs[[REG_EIP]]" # Linux (i386) pc_fields="$pc_fields uc_mcontext.gregs[[REG_RIP]]" # Linux (x86_64) @@ -28,13 +33,23 @@ AC_DEFUN([AC_PC_FROM_UCONTEXT], pc_field_found=false for pc_field in $pc_fields; do if ! $pc_field_found; then - AC_TRY_COMPILE([#define _GNU_SOURCE 1 - #include <ucontext.h>], - [ucontext_t u; return u.$pc_field == 0;], - AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field, - How to access the PC from a struct ucontext) - AC_MSG_RESULT([$pc_field]) - pc_field_found=true) + if test "x$ac_cv_header_sys_ucontext_h" = xyes; then + AC_TRY_COMPILE([#define _GNU_SOURCE 1 + #include <sys/ucontext.h>], + [ucontext_t u; return u.$pc_field == 0;], + AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field, + How to access the PC from a struct ucontext) + AC_MSG_RESULT([$pc_field]) + pc_field_found=true) + else + AC_TRY_COMPILE([#define _GNU_SOURCE 1 + #include <ucontext.h>], + [ucontext_t u; return u.$pc_field == 0;], + AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field, + How to access the PC from a struct ucontext) + AC_MSG_RESULT([$pc_field]) + pc_field_found=true) + fi fi done if ! $pc_field_found; then @@ -52,5 +67,5 @@ AC_DEFUN([AC_PC_FROM_UCONTEXT], done fi if ! $pc_field_found; then - AC_MSG_WARN(Could not find the PC. Will not output failed addresses...) + [$1] fi]) |