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71 lines
2.3 KiB
71 lines
2.3 KiB
# asm-underscore.m4 serial 3 |
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dnl Copyright (C) 2010-2017 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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dnl From Bruno Haible. Based on as-underscore.m4 in GNU clisp. |
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# gl_ASM_SYMBOL_PREFIX |
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# Tests for the prefix of C symbols at the assembly language level and the |
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# linker level. This prefix is either an underscore or empty. Defines the |
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# C macro USER_LABEL_PREFIX to this prefix, and sets ASM_SYMBOL_PREFIX to |
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# a stringified variant of this prefix. |
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AC_DEFUN([gl_ASM_SYMBOL_PREFIX], |
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[ |
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dnl We don't use GCC's __USER_LABEL_PREFIX__ here, because |
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dnl 1. It works only for GCC. |
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dnl 2. It is incorrectly defined on some platforms, in some GCC versions. |
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AC_REQUIRE([gl_C_ASM]) |
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AC_CACHE_CHECK( |
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[whether C symbols are prefixed with underscore at the linker level], |
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[gl_cv_prog_as_underscore], |
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[cat > conftest.c <<EOF |
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#ifdef __cplusplus |
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extern "C" int foo (void); |
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#endif |
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int foo(void) { return 0; } |
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EOF |
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# Look for the assembly language name in the .s file. |
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AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $gl_c_asm_opt conftest.c) >/dev/null 2>&1 |
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if LC_ALL=C grep -E '(^|[[^a-zA-Z0-9_]])_foo([[^a-zA-Z0-9_]]|$)' conftest.$gl_asmext >/dev/null; then |
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gl_cv_prog_as_underscore=yes |
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else |
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gl_cv_prog_as_underscore=no |
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fi |
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rm -f conftest* |
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]) |
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if test $gl_cv_prog_as_underscore = yes; then |
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USER_LABEL_PREFIX=_ |
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else |
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USER_LABEL_PREFIX= |
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fi |
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AC_DEFINE_UNQUOTED([USER_LABEL_PREFIX], [$USER_LABEL_PREFIX], |
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[Define to the prefix of C symbols at the assembler and linker level, |
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either an underscore or empty.]) |
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ASM_SYMBOL_PREFIX='"'${USER_LABEL_PREFIX}'"' |
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AC_SUBST([ASM_SYMBOL_PREFIX]) |
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]) |
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# gl_C_ASM |
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# Determines how to produce an assembly language file from C source code. |
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# Sets the variables: |
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# gl_asmext - the extension of assembly language output, |
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# gl_c_asm_opt - the C compiler option that produces assembly language output. |
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AC_DEFUN([gl_C_ASM], |
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[ |
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AC_EGREP_CPP([MicrosoftCompiler], |
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[ |
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#ifdef _MSC_VER |
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MicrosoftCompiler |
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#endif |
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], |
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[gl_asmext='asm' |
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gl_c_asm_opt='-c -Fa' |
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], |
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[gl_asmext='s' |
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gl_c_asm_opt='-S' |
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]) |
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])
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