kc3-lang/gnulib/modules/sigsegv

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• Hash : 2d830e4a
  Author :
  Date : 2022-03-13T15:12:46
  

  sigsegv: Add support for Linux/PowerPC (32-bit) with musl libc.
  
  Reported by Khem Raj <raj.khem@gmail.com> in
  <https://lists.gnu.org/archive/html/m4-patches/2022-03/msg00000.html>.
  
  * src/sigsegv.c (SIGSEGV_FAULT_STACKPOINTER): In the Linux/PowerPC
  32-bit case, handle musl libc differently.
  * modules/sigsegv (Files): Add m4/musl.m4.
  (configure.ac): Invoke gl_MUSL_LIBC.
  

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• modules/sigsegv

• Description:
  A simplified variant of GNU libsigsegv.
  It implements the most important features of GNU libsigsegv: catching SIGSEGV
  and catching stack overflow. It does *not* implement the 'sigsegv_dispatcher'
  type (which is not multithread-safe).
  It supports all modern Unix-like platforms: Linux, Hurd, FreeBSD, NetBSD,
  OpenBSD, macOS, AIX, Solaris, Cygwin, Haiku, even IRIX. It does *not* support
  HP-UX, Minix, native Windows; on these platforms the module compiles and
  provides a <sigsegv.h> header file, but it does not define HAVE_SIGSEGV_RECOVERY
  and HAVE_STACK_OVERFLOW_RECOVERY.
  Unlike GNU libsigsegv, which consists of many .h and .c files, this module
  compiles to just two object files, rather than a library.
  
  Files:
  lib/sigsegv.in.h
  lib/sigsegv.c
  lib/stackvma.h
  lib/stackvma.c
  m4/mmap-anon.m4
  m4/musl.m4
  m4/sigaltstack.m4
  m4/stack-direction.m4
  m4/libsigsegv.m4
  m4/sigsegv.m4
  
  Depends-on:
  gen-header
  havelib
  host-cpu-c-abi
  stdint
  getpagesize
  
  configure.ac:
  AC_REQUIRE([gl_SIGSEGV])
  if test $gl_sigsegv_uses_libsigsegv = yes; then
    GL_GENERATE_SIGSEGV_H=false
  else
    GL_GENERATE_SIGSEGV_H=true
  fi
  gl_CONDITIONAL_HEADER([sigsegv.h])
  AC_PROG_MKDIR_P
  if $GL_GENERATE_SIGSEGV_H; then
    dnl Persuade glibc <sys/ucontext.h> to declare macros designating register
    dnl indices: REG_RSP on x86_64, REG_ESP on i386.
    dnl Persuade Solaris OpenIndiana <ucontext.h> to include <sys/regset.h>,
    dnl which declares macros designating register indices, such as ESP on i386.
    dnl Persuade Solaris OpenIndiana <unistd.h> to declare mincore().
    AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  
    gl_MUSL_LIBC
  
    AC_REQUIRE([AC_CANONICAL_HOST])
    case "$host_os" in
      solaris2.11)
        AC_DEFINE([SOLARIS11], [1], [Define on Solaris 11 and its derivates.])
        ;;
    esac
  
    gl_FUNC_MMAP_ANON
  
    dnl Stack direction.
    SV_STACK_DIRECTION
  
    dnl Catching stack overflow requires an alternate signal stack.
    dnl The old "install a guard page" trick would be unreliable, because
    dnl we don't know where exactly to place the guard page.
    SV_SIGALTSTACK
  
    AC_CHECK_FUNCS_ONCE([getrlimit])
  fi
  
  Makefile.am:
  BUILT_SOURCES += $(SIGSEGV_H)
  
  if GL_GENERATE_SIGSEGV_H
  sigsegv.h: sigsegv.in.h $(top_builddir)/config.status
  @NMD@	$(AM_V_GEN)$(MKDIR_P) '%reldir%'
  	$(gl_V_at)$(SED_HEADER_TO_AT_t) $(srcdir)/sigsegv.in.h
  	$(AM_V_at)mv $@-t $@
  else
  sigsegv.h: $(top_builddir)/config.status
  	rm -f $@
  endif
  MOSTLYCLEANFILES += sigsegv.h sigsegv.h-t
  
  if GL_GENERATE_SIGSEGV_H
  lib_SOURCES += sigsegv.c stackvma.c
  endif
  
  Include:
  <sigsegv.h>
  
  Link:
  $(LTLIBSIGSEGV) when linking with libtool, $(LIBSIGSEGV) otherwise
  
  License:
  GPLv2+
  
  Maintainer:
  Bruno Haible
  

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