diff options
Diffstat (limited to 'libstdc++-v3/acinclude.m4')
| -rw-r--r-- | libstdc++-v3/acinclude.m4 | 44 |
1 files changed, 35 insertions, 9 deletions
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4 index f53461c85a5..138bd58d86c 100644 --- a/libstdc++-v3/acinclude.m4 +++ b/libstdc++-v3/acinclude.m4 @@ -3612,6 +3612,9 @@ AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [ dnl Why don't we check 8-byte CAS for sparc64, where _Atomic_word is long?! dnl New targets should only check for CAS for the _Atomic_word type. AC_TRY_COMPILE([ + #if defined __riscv + # error "Defaulting to mutex-based locks for ABI compatibility" + #endif #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 # error "No 2-byte compare-and-swap" #elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 @@ -5003,18 +5006,41 @@ elf64) elfsize=64 ;; esac BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize" - ALLOC_FILE=alloc.lo - AC_SUBST(ALLOC_FILE) - VIEW_FILE=read.lo - AC_SUBST(VIEW_FILE) - AC_MSG_CHECKING([whether to build libbacktrace support]) - if test "$enable_libstdcxx_backtrace" == "auto"; then + if test "$enable_libstdcxx_backtrace" = "auto"; then enable_libstdcxx_backtrace=no fi - if test "$enable_libstdcxx_backtrace" == "yes"; then + if test "$enable_libstdcxx_backtrace" = "yes"; then BACKTRACE_SUPPORTED=1 - BACKTRACE_USES_MALLOC=1 + + AC_CHECK_HEADERS(sys/mman.h) + case "${host}" in + *-*-msdosdjgpp) # DJGPP has sys/man.h, but no mmap + have_mmap=no ;; + *-*-*) + have_mmap="$ac_cv_header_sys_mman_h" ;; + esac + + if test "$have_mmap" = "no"; then + VIEW_FILE=read.lo + ALLOC_FILE=alloc.lo + else + VIEW_FILE=mmapio.lo + AC_PREPROC_IFELSE([AC_LANG_SOURCE([ + #include <sys/mman.h> + #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON) + #error no MAP_ANONYMOUS + #endif + ])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo]) + fi + AC_SUBST(VIEW_FILE) + AC_SUBST(ALLOC_FILE) + + BACKTRACE_USES_MALLOC=0 + if test "$ALLOC_FILE" = "alloc.lo"; then + BACKTRACE_USES_MALLOC=1 + fi + if test "$ac_has_gthreads" = "yes"; then BACKTRACE_SUPPORTS_THREADS=1 else @@ -5031,7 +5057,7 @@ BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize" BACKTRACE_SUPPORTS_THREADS=0 fi AC_MSG_RESULT($enable_libstdcxx_backtrace) - GLIBCXX_CONDITIONAL(ENABLE_BACKTRACE, [test "$enable_libstdcxx_backtrace" != no]) + GLIBCXX_CONDITIONAL(ENABLE_BACKTRACE, [test "$enable_libstdcxx_backtrace" = yes]) ]) # Macros from the top-level gcc directory. |