Error Invalid Identifier For . #ifdef
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programmers, just like you, helping each other. Join them; it only takes a minute: Sign up gnu arm assembler command line macro fails with “Invalid identifier for .ifdef” up vote 6 down vote favorite 1 My toolchain is a recent version of arm-gcc. I have a piece of code in an assembly file which must be invalid identifier error in informatica conditionally included/assembled. .ifdef MACRO_FROM_CMDLINE Assembly instr1 Assembly instr2 .endif Encapsulated code is a recent addition. I have tried both: gcc -x assembler-with-cpp --defsym MACRO_FROM_CMDLINE=1
Thu, 15 Feb 2007 14:30:32 -0800 Hi When we compile eglibc gnu assembler syntax with -march=i686 or pentium3 I get following compile errors. ../sysdeps/i386/fpu/s_frexp.S: Assembler messages: ../sysdeps/i386/fpu/s_frexp.S:66: Error: invalid identifier for ".ifdef" ../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character is `1' ../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character http://stackoverflow.com/questions/12768306/gnu-arm-assembler-command-line-macro-fails-with-invalid-identifier-for-ifdef is `1' ../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character is `1' ../sysdeps/i386/fpu/s_frexp.S:66: Error: unrecognized symbol type "" ../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized character is `1' ../sysdeps/i386/fpu/s_frexp.S:66: Error: junk at end of line, first unrecognized http://www.eglibc.org/archives/patches/msg00073.html character is `1' ../sysdeps/i386/fpu/s_frexp.S:66: Error: expected comma after name `' in .size directive ../sysdeps/i386/fpu/s_frexp.S:66: Error: ".endif" without ".if" ../sysdeps/i386/fpu/s_frexp.S:66: Error: junk `.get_pc_thunk.dx' after expression This error happens because gcc define __i686 if we have march=i686 and preprocessor replaces __i686 with "1" and hence the error. This patch undefs the previous definition of __i686 and redefines it OK? Thanks -Khem Changelog.eglibc 2007-02-15 Khem Raj
the compiler. Preprocessor conditionals can test arithmetic expressions, or whether a name is defined as a macro, https://gcc.gnu.org/onlinedocs/gcc-3.0.2/cpp_4.html or both simultaneously using the special defined operator. A conditional in the C preprocessor resembles in some ways an if statement in C, but it is important to understand the difference between them. The condition in an if statement is tested during the execution of your program. Its purpose is to allow your program to behave differently from run to run, depending on the data it is operating on. The condition invalid identifier in a preprocessing conditional directive is tested when your program is compiled. Its purpose is to allow different code to be included in the program depending on the situation at the time of compilation. However, the distinction is becoming less clear. Modern compilers often do test if statements when a program is compiled, if their conditions are known not to vary at run time, and eliminate code which can never be error invalid identifier executed. If you can count on your compiler to do this, you may find that your program is more readable if you use if statements with constant conditions (perhaps determined by macros). Of course, you can only use this to exclude code, not type definitions or other preprocessing directives, and you can only do it if the code remains syntactically valid when it is not to be used. GCC version 3 eliminates this kind of never-executed code even when not optimizing. Older versions did it only when optimizing. 4.1 Conditional Uses 4.2 Conditional Syntax 4.3 Deleted Code [ < ] [ > ] [ << ] [ Up ] [ >> ] [Top] [Contents] [Index] [ ? ] 4.1 Conditional Uses There are three general reasons to use a conditional. A program may need to use different code depending on the machine or operating system it is to run on. In some cases the code for one operating system may be erroneous on another operating system; for example, it might refer to data types or constants that do not exist on the other system. When this happens, it is not enough to avoid executing the invalid code. Its mere presence will cause the compiler to reject th