mirror of
https://gitlab.rtems.org/rtems/rtos/rtems.git
synced 2025-12-26 22:48:23 +00:00
92 lines
2.6 KiB
Plaintext
92 lines
2.6 KiB
Plaintext
dnl
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dnl $Id$
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dnl
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dnl Check for target g++
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dnl
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dnl Adaptation of autoconf-2.12's AC_PROG_CXX to rtems
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dnl
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dnl 98/02/10 Ralf Corsepius (corsepiu@faw.uni-ulm.de)
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dnl
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AC_DEFUN(RTEMS_PROG_CXX,
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[
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AC_BEFORE([$0], [AC_PROG_CXXCPP])dnl
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AC_BEFORE([$0], [AC_PROG_CXX])dnl
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AC_CHECK_PROGS(CXX, $CCC c++ g++ gcc CC cxx cc++, gcc)
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RTEMS_PROG_CXX_WORKS
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AC_PROG_CXX_GNU
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if test $ac_cv_prog_gxx = yes; then
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GXX=yes
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dnl Check whether -g works, even if CXXFLAGS is set, in case the package
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dnl plays around with CXXFLAGS (such as to build both debugging and
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dnl normal versions of a library), tasteless as that idea is.
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ac_test_CXXFLAGS="${CXXFLAGS+set}"
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ac_save_CXXFLAGS="$CXXFLAGS"
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CXXFLAGS=
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AC_PROG_CXX_G
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if test "$ac_test_CXXFLAGS" = set; then
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CXXFLAGS="$ac_save_CXXFLAGS"
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elif test $ac_cv_prog_cxx_g = yes; then
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CXXFLAGS="-g -O2"
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else
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CXXFLAGS="-O2"
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fi
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else
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GXX=
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test "${CXXFLAGS+set}" = set || CXXFLAGS="-g"
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fi
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CXX_FOR_TARGET=$CXX
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dnl restore initial values
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unset CXX
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unset ac_cv_prog_gxx
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])
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dnl Almost identical to AC_PROG_CXX_WORKS
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dnl Additional handling of malloc
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dnl NOTE: using newlib with a native compiler is cross-compiling, indeed.
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AC_DEFUN(RTEMS_PROG_CXX_WORKS,
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[AC_MSG_CHECKING([whether the target C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works])
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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dnl this fails if rtems uses newlib, because rtems has its own malloc which
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dnl is not available at bootstrap
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AC_TRY_COMPILER(
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[main(){return(0);}],
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rtems_cv_prog_cxx_works, rtems_cv_prog_cxx_cross)
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if test "$rtems_cv_prog_cxx_works" = "no"; then
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dnl now retry with our own version of malloc
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AC_TRY_COMPILER(
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[extern "C" void *malloc(); void *malloc() { return (0); }
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extern "C" int atexit(); int atexit() { return 0; }
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#if defined(__PPC__)
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int __SDATA_START__; int __SDATA2_START__;
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int __GOT_START__; int __GOT_END__;
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int __GOT2_START__; int __GOT2_END__;
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int __SBSS_END__; int __SBSS2_END__;
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int __FIXUP_START__; int __FIXUP_END__;
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int __EXCEPT_START__; int __EXCEPT_END__;
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int __init; int __fini;
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#endif
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#if defined(__hppa__)
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asm ( ".subspa \$GLOBAL\$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=40");
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asm ( ".export \$global\$" );
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asm ( "\$global\$:");
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#endif
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main(){return(0);}],
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rtems_cv_prog_cxx_works, rtems_cv_prog_cxx_cross)
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fi
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AC_LANG_RESTORE
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AC_MSG_RESULT($rtems_cv_prog_cxx_works)
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if test $rtems_cv_prog_cxx_works = no; then
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AC_MSG_ERROR([installation or configuration problem: target C++ compiler cannot create executables.])
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fi
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AC_MSG_CHECKING([whether the target C++ compiler ($CXX $CXXFLAGS $LDFLAGS) is a cross-compiler])
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AC_MSG_RESULT($rtems_cv_prog_cxx_cross)
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])
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