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Annotation of embedaddon/libiconv/srcm4/asm-underscore.m4, revision 1.1

1.1     ! misho       1: # asm-underscore.m4 serial 1
        !             2: dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
        !             3: dnl This file is free software; the Free Software Foundation
        !             4: dnl gives unlimited permission to copy and/or distribute it,
        !             5: dnl with or without modifications, as long as this notice is preserved.
        !             6: 
        !             7: dnl From Bruno Haible. Based on as-underscore.m4 in GNU clisp.
        !             8: 
        !             9: # gl_ASM_SYMBOL_PREFIX
        !            10: # Tests for the prefix of C symbols at the assembly language level and the
        !            11: # linker level. This prefix is either an underscore or empty. Defines the
        !            12: # C macro USER_LABEL_PREFIX to this prefix, and sets ASM_SYMBOL_PREFIX to
        !            13: # a stringified variant of this prefix.
        !            14: 
        !            15: AC_DEFUN([gl_ASM_SYMBOL_PREFIX],
        !            16: [
        !            17:   dnl We don't use GCC's __USER_LABEL_PREFIX__ here, because
        !            18:   dnl 1. It works only for GCC.
        !            19:   dnl 2. It is incorrectly defined on some platforms, in some GCC versions.
        !            20:   AC_CACHE_CHECK(
        !            21:     [whether C symbols are prefixed with underscore at the linker level],
        !            22:     [gl_cv_prog_as_underscore],
        !            23:     [cat > conftest.c <<EOF
        !            24: #ifdef __cplusplus
        !            25: extern "C" int foo (void);
        !            26: #endif
        !            27: int foo(void) { return 0; }
        !            28: EOF
        !            29:      # Look for the assembly language name in the .s file.
        !            30:      AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c) >/dev/null 2>&1
        !            31:      if grep _foo conftest.s >/dev/null ; then
        !            32:        gl_cv_prog_as_underscore=yes
        !            33:      else
        !            34:        gl_cv_prog_as_underscore=no
        !            35:      fi
        !            36:      rm -f conftest*
        !            37:     ])
        !            38:   if test $gl_cv_prog_as_underscore = yes; then
        !            39:     USER_LABEL_PREFIX=_
        !            40:   else
        !            41:     USER_LABEL_PREFIX=
        !            42:   fi
        !            43:   AC_DEFINE_UNQUOTED([USER_LABEL_PREFIX], [$USER_LABEL_PREFIX],
        !            44:     [Define to the prefix of C symbols at the assembler and linker level,
        !            45:      either an underscore or empty.])
        !            46:   ASM_SYMBOL_PREFIX='"'${USER_LABEL_PREFIX}'"'
        !            47:   AC_SUBST([ASM_SYMBOL_PREFIX])
        !            48: ])