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annotate m4/asm-underscore.m4 @ 39239:31d885413cfb

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host-cpu-c-abi: Avoid use of 'grep -E' on OpenIndiana. * m4/asm-underscore.m4 (gl_ASM_SYMBOL_PREFIX): Require AC_PROG_EGREP, and use $EGREP instead of 'grep -E'. * m4/host-cpu-c-abi.m4 (gl_HOST_CPU_C_ABI): Use 'grep' instead of 'grep -E'.
author Bruno Haible <bruno@clisp.org>
date Sat, 03 Feb 2018 12:50:17 +0100
parents 24e347e0e326
children b06060465f09
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # asm-underscore.m4 serial 4
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2 dnl Copyright (C) 2010-2018 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl From Bruno Haible. Based on as-underscore.m4 in GNU clisp.
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8
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9 # gl_ASM_SYMBOL_PREFIX
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10 # Tests for the prefix of C symbols at the assembly language level and the
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11 # linker level. This prefix is either an underscore or empty. Defines the
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12 # C macro USER_LABEL_PREFIX to this prefix, and sets ASM_SYMBOL_PREFIX to
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13 # a stringified variant of this prefix.
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14
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15 AC_DEFUN([gl_ASM_SYMBOL_PREFIX],
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16 [
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17 AC_REQUIRE([AC_PROG_EGREP])
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18 dnl We don't use GCC's __USER_LABEL_PREFIX__ here, because
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19 dnl 1. It works only for GCC.
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20 dnl 2. It is incorrectly defined on some platforms, in some GCC versions.
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21 AC_REQUIRE([gl_C_ASM])
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22 AC_CACHE_CHECK(
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23 [whether C symbols are prefixed with underscore at the linker level],
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24 [gl_cv_prog_as_underscore],
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25 [cat > conftest.c <<EOF
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26 #ifdef __cplusplus
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27 extern "C" int foo (void);
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28 #endif
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29 int foo(void) { return 0; }
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30 EOF
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31 # Look for the assembly language name in the .s file.
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32 AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $gl_c_asm_opt conftest.c) >/dev/null 2>&1
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33 if LC_ALL=C $EGREP '(^|[[^a-zA-Z0-9_]])_foo([[^a-zA-Z0-9_]]|$)' conftest.$gl_asmext >/dev/null; then
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34 gl_cv_prog_as_underscore=yes
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35 else
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36 gl_cv_prog_as_underscore=no
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37 fi
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38 rm -f conftest*
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39 ])
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40 if test $gl_cv_prog_as_underscore = yes; then
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41 USER_LABEL_PREFIX=_
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42 else
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43 USER_LABEL_PREFIX=
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44 fi
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45 AC_DEFINE_UNQUOTED([USER_LABEL_PREFIX], [$USER_LABEL_PREFIX],
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46 [Define to the prefix of C symbols at the assembler and linker level,
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47 either an underscore or empty.])
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48 ASM_SYMBOL_PREFIX='"'${USER_LABEL_PREFIX}'"'
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49 AC_SUBST([ASM_SYMBOL_PREFIX])
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50 ])
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51
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52 # gl_C_ASM
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53 # Determines how to produce an assembly language file from C source code.
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54 # Sets the variables:
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55 # gl_asmext - the extension of assembly language output,
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56 # gl_c_asm_opt - the C compiler option that produces assembly language output.
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57
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58 AC_DEFUN([gl_C_ASM],
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59 [
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60 AC_EGREP_CPP([MicrosoftCompiler],
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61 [
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62 #ifdef _MSC_VER
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63 MicrosoftCompiler
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64 #endif
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65 ],
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66 [gl_asmext='asm'
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67 gl_c_asm_opt='-c -Fa'
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68 ],
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69 [gl_asmext='s'
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70 gl_c_asm_opt='-S'
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71 ])
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72 ])