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Annotation of embedaddon/libiconv/srcm4/asm-underscore.m4, revision 1.1.1.2

1.1.1.2 ! misho       1: # asm-underscore.m4 serial 4
        !             2: dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
1.1       misho       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: [
1.1.1.2 ! misho      17:   AC_REQUIRE([AC_PROG_EGREP])
1.1       misho      18:   dnl We don't use GCC's __USER_LABEL_PREFIX__ here, because
                     19:   dnl 1. It works only for GCC.
                     20:   dnl 2. It is incorrectly defined on some platforms, in some GCC versions.
1.1.1.2 ! misho      21:   AC_REQUIRE([gl_C_ASM])
1.1       misho      22:   AC_CACHE_CHECK(
                     23:     [whether C symbols are prefixed with underscore at the linker level],
                     24:     [gl_cv_prog_as_underscore],
                     25:     [cat > conftest.c <<EOF
                     26: #ifdef __cplusplus
                     27: extern "C" int foo (void);
                     28: #endif
                     29: int foo(void) { return 0; }
                     30: EOF
                     31:      # Look for the assembly language name in the .s file.
1.1.1.2 ! misho      32:      AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $gl_c_asm_opt conftest.c) >/dev/null 2>&1
        !            33:      if LC_ALL=C $EGREP '(^|[[^a-zA-Z0-9_]])_foo([[^a-zA-Z0-9_]]|$)' conftest.$gl_asmext >/dev/null; then
1.1       misho      34:        gl_cv_prog_as_underscore=yes
                     35:      else
                     36:        gl_cv_prog_as_underscore=no
                     37:      fi
                     38:      rm -f conftest*
                     39:     ])
                     40:   if test $gl_cv_prog_as_underscore = yes; then
                     41:     USER_LABEL_PREFIX=_
                     42:   else
                     43:     USER_LABEL_PREFIX=
                     44:   fi
                     45:   AC_DEFINE_UNQUOTED([USER_LABEL_PREFIX], [$USER_LABEL_PREFIX],
                     46:     [Define to the prefix of C symbols at the assembler and linker level,
                     47:      either an underscore or empty.])
                     48:   ASM_SYMBOL_PREFIX='"'${USER_LABEL_PREFIX}'"'
                     49:   AC_SUBST([ASM_SYMBOL_PREFIX])
                     50: ])
1.1.1.2 ! misho      51: 
        !            52: # gl_C_ASM
        !            53: # Determines how to produce an assembly language file from C source code.
        !            54: # Sets the variables:
        !            55: #   gl_asmext - the extension of assembly language output,
        !            56: #   gl_c_asm_opt - the C compiler option that produces assembly language output.
        !            57: 
        !            58: AC_DEFUN([gl_C_ASM],
        !            59: [
        !            60:   AC_EGREP_CPP([MicrosoftCompiler],
        !            61:     [
        !            62: #ifdef _MSC_VER
        !            63: MicrosoftCompiler
        !            64: #endif
        !            65:     ],
        !            66:     [gl_asmext='asm'
        !            67:      gl_c_asm_opt='-c -Fa'
        !            68:     ],
        !            69:     [gl_asmext='s'
        !            70:      gl_c_asm_opt='-S'
        !            71:     ])
        !            72: ])