Part I C++ Compiler

Chapter 1 The C++ Compiler

This chapter provides information about the following:

• 1.1 New Features and Functionality of the Sun Studio 12 C++ 5.9 Compiler

• 1.2 Standards Conformance.

• 1.3 C++ Readme File.

• 1.4 Man Pages.

• 1.5 C++ Utilities.

• 1.6 Native-Language Support.

1.1 New Features and Functionality of the Sun Studio 12 C++ 5.9 Compiler

This section provides a brief overview of the new C compiler features and functionality introduced in the Sun Studio 12 C++ 5.9 Compiler release. For specific explanations, follow the cross references provided for each item.

• The C compiler is now available on the following Linux distributions (x86 and x64)

  • SuSE Linux Enterprise Server 9 with Service Pack 3 (or later).

  • Red Hat Enterprise Linux 4.

  • Other Linux distributions based on the 2.6 kernel though these are not officially supported.

• New -m32|-m64 options to determine the memory model.

• New flags for -xarch replace obsolete flags.

• New values for -xtarget and -xchip provide code generation for the UltraSPARC T2 and SPARC64vi processors.

• New flag -fma=fused to enable generation of fused multiply-add instructions on processors that support them.

• Explicit prefetch macros accepted on x86 platforms as well as SPARC platforms. (-xprefetch=explicit)

1.1.1 Compiling for 64–Bit Platforms

The way to specify compilation of a 32-bit or 64-bit binary has changed in this release. The A.2.107 –xarch=isaoption no longer carries an implicit memory model, 32-bit ILP32 or 64-bit LP64, with each definition, and is now used only to specify the instruction set of the target processor.

Use the new A.2.50 -m32|-m64 options to specify the memory model of the target compilation.

The ILP32 model specifies that C-language int, long, and pointer data types are all 32-bits wide. The LP64 model specifies that long and pointer data types are all 64-bits wide. The Solaris and Linux OS also support large files and large arrays under the LP64 memory model.

When you compile with -m64, the resulting executable works only on 64-bit UltraSPARC(R) or x86 processors under Solaris OS or Linux OS running a 64-bit kernel. Compilation, linking, and execution of 64-bit objects can only take place in a Solaris or Linux OS that supports 64-bit execution.

1.1.2 Special x86 Notes

There are some important issues to be aware of when compiling for x86 Solaris platforms.

The legacy Sun-style parallelization pragmas are not available on x86. Use OpenMP instead. See the Sun Studio 12: OpenMP API User’s Guide for information on converting legacy parallelization directives to OpenMP.

Programs compiled with -xarch set to sse, sse2, sse2a, or sse3 must be run only on platforms that provide these extensions and features.

Solaris OS releases starting with Solaris 9 4/04 are SSE/SSE2-enabled on Pentium 4-compatible platforms. Earlier versions of Solaris OS are not SSE/SSE2-enabled. If an instruction set selected by -xarch is not enabled in the running Solaris OS, the compiler will not be able to generate or link code for that instruction set.

If you compile and link in separate steps, always link using the compiler and with same -xarch setting to ensure that the correct startup routine is linked.

Numerical results on x86 might differ from results on SPARC due to the x86 80-bit floating-point registers. To minimize these differences, use the -fstore option or compile with x-arch=sse2 if the hardware supports SSE2.

Numerical results can also differ between Solaris and Linux because the intrinsic math libraries (for example, sin(x)) are not the same.

1.1.3 Binary Compatibility Verification

Starting with Sun Studio 11 and the Solaris 10 OS, program binaries compiled and built using these specialized -xarch hardware flags are verified that they are being run on the appropriate platform.

On systems prior to Solaris 10, no verification is done and it is the user's responsibility to ensure objects built using these flags are deployed on suitable hardware.

Running programs compiled with these -xarch options on platforms that are not enabled with the appropriate features or instruction set extensions could result in segmentation faults or incorrect results occurring without any explicit warning messages.

This warning extends also to programs that employ .il inline assembly language functions or __asm() assembler code that utilize SSE, SSE2, SSE2a, and SSE3 instructions and extensions.

1.2 Standards Conformance

The C++ compiler (CC) supports the ISO International Standard for C++, ISO IS 14882:1998, Programming Language—C++. The readme file that accompanies the current release describes any departures from requirements in the standard.

On SPARC^TM platforms, the compiler provides support for the optimization-exploiting features of SPARC V8 and SPARC V9, including the UltraSPARC^TM implementation. These features are defined in the SPARC Architecture Manuals, Version 8 (ISBN 0-13-825001-4), and Version 9 (ISBN 0-13-099227-5), published by Prentice-Hall for SPARC International.

In this document, “Standard” means conforming to the versions of the standards listed above. “Nonstandard” or “Extension” refers to features that go beyond these versions of these standards.

The responsible standards bodies may revise these standards from time to time. The versions of the applicable standards to which the C++ compiler conforms may be revised or replaced, resulting in features in future releases of the Sun C++ compiler that create incompatibilities with earlier releases.

1.3 C++ Readme File

The C++ compiler’s readme file highlights important information about the compiler, including:

• Information discovered after the manuals were printed

• New and changed features

• Software corrections

• Problems and workarounds

• Limitations and incompatibilities

• Shippable libraries

• Standards not implemented

To view the text version of the C++ readme file, type the following at a command prompt:

example% CC -xhelp=readme

To access the HTML version of the readme, in your Netscape Communicator 4.0 or compatible version browser, open the following file:

/opt/SUNWspro/docs/index.html

(If your C++ compiler-software is not installed in the /opt directory, ask your system administrator for the equivalent path on your system.) Your browser displays an index of HTML documents. To open the readme, find its entry in the index, then click the title.

1.4 Man Pages

Online manual (man) pages provide immediate documentation about a command, function, subroutine, or collection of such things.

You can display a man page by running the command:

example% man topic

Throughout the C++ documentation, man page references appear with the topic name and man section number: CC(1) is accessed with man CC. Other sections, denoted by ieee_flags(3M) for example, are accessed using the -s option on the man command:

example% man -s 3M ieee_flags

1.5 C++ Utilities

The following C++ utilities are now incorporated into traditional UNIX® tools and are bundled with the UNIX operating system:

• lex—Generates programs used in simple lexical analysis of text

• yacc—Generates a C function to parse the input stream according to syntax

• prof—Produces an execution profile of modules in a program

• gprof—Profiles program runtime performance by procedure

• tcov—Profiles program runtime performance by statement

See Program Performance Analysis Tools and associated man pages for further information on these UNIX tools.

1.6 Native-Language Support

This release of C++ supports the development of applications in languages other than English, including most European languages and Japanese. As a result, you can easily switch your application from one native language to another. This feature is known as internationalization.

In general, the C++ compiler implements internationalization as follows:

• C++ recognizes ASCII characters from international keyboards (in other words, it has keyboard independence and is 8-bit clean).

• C++ allows the printing of some messages in the native language.

• C++ allows native-language characters in comments, strings, and data.

• C++ supports only Extended UNIX Character (EUC) compliant character sets - a character set in which every null byte in a string is the null character and every byte in the string with the ascii value of ’/’ is the ’/’ character.

Variable names cannot be internationalized and must be in the English character set.

You can change your application from one native language to another by setting the locale. For information on this and other native-language support features, see the operating system documentation.

Chapter 2 Using the C++ Compiler

This chapter describes how to use the C++ compiler.

The principal use of any compiler is to transform a program written in a high-level language like C++ into a data file that is executable by the target computer hardware. You can use the C++ compiler to:

• Transform source files into relocatable binary (.o) files, to be linked later into an executable file, a static (archive) library (.a) file (using– xar), or a dynamic (shared) library (.so) file

• Link or relink object files or library files (or both) into an executable file

• Compile an executable file with runtime debugging enabled (-g)

• Compile an executable file with runtime statement or procedure-level profiling (-pg)

2.1 Getting Started

This section gives you a brief overview of how to use the C++ compiler to compile and run C++ programs. See 16.8 Using dlopen to Access a C++ Library From a C Program for a full reference to the command-line options.

The command-line examples in this chapter show CC usages. Printed output might be slightly different.

The basic steps for building and running a C++ program involve:

1. Using an editor to create a C++ source file with one of the valid suffixes listed in Table 2–1

2. Invoking the compiler to produce an executable file

3. Launching the program into execution by typing the name of the executable file

The following program displays a message on the screen:

example% cat greetings.cc
    #include <iostream>
    int main()  {
      std::cout << “Real programmers write C++!” << std::endl;
      return 0;
    }
example% CC greetings.cc
example% a.out
 Real programmers write C++!
example%

In this example, CC compiles the source file greetings.cc and, by default, compiles the executable program onto the file, a.out. To launch the program, type the name of the executable file, a.out, at the command prompt.

Traditionally, UNIX compilers name the executable file a.out. It can be awkward to have each compilation write to the same file. Moreover, if such a file already exists, it will be overwritten the next time you run the compiler. Instead, use the -o compiler option to specify the name of the executable output file, as in the following example:

example% CC– o greetings greetings.cc

In this example, the -o option tells the compiler to write the executable code to the file greetings. (It is common to give a program consisting of a single source file the name of the source file without the suffix.)

Alternatively, you could rename the default a.out file using the mv command after each compilation. Either way, run the program by typing the name of the executable file:

example% greetings
Real programmers write C++!
example%

2.2 Invoking the Compiler

The remainder of this chapter discuss the conventions used by the CC command, compiler source line directives, and other issues concerning the use of the compiler.

2.2.1 Command Syntax

The general syntax of a compiler command line is as follows:

CC [options] [source-files] [object-files] [libraries]

An option is an option keyword prefixed by either a dash (–) or a plus sign (+). Some options take arguments.

In general, the processing of the compiler options is from left to right, allowing selective overriding of macro options (options that include other options). In most cases, if you specify the same option more than once, the rightmost assignment overrides and there is no accumulation. Note the following exceptions:

• All linker options and the -features, –I -l,– L, -library, –pti, –R, -staticlib, -U, -verbose, -xdumpmacros, and -xprefetch options accumulate, they do not override.

• All –U options are processed after all –D options.

Source files, object files, and libraries are compiled and linked in the order in which they appear on the command line.

In the following example, CC is used to compile two source files (growth.C and fft.C) to produce an executable file named growth with runtime debugging enabled:

example% CC -g -o growth growth.C fft.C

2.2.2 File Name Conventions

The suffix attached to a file name appearing on the command line determines how the compiler processes the file. A file name with a suffix other than those listed in the following table, or without a suffix, is passed to the linker.

2.2.3 Using Multiple Source Files

The C++ compiler accepts multiple source files on the command line. A single source file compiled by the compiler, together with any files that it directly or indirectly supports, is referred to as a compilation unit. C++ treats each source as a separate compilation unit.

2.3 Compiling With Different Compiler Versions

Beginning with the C++ 5.1 compiler, the compiler marks a template cache directory with a string that identifies the template cache’s version.

This compiler does not use the cache by default. It only uses the cache if you specify -instances=extern. If the compiler makes use of the cache, it checks the cache directory’s version and issues error messages whenever it encounters cache version problems. Future C++ compilers will also check cache versions. For example, a future compiler that has a different template cache version identification and that processes a cache directory produced by this release of the compiler might issue an error that is similar to the following message:

Template Database at ./SunWS_cache is incompatible with
this compiler

Similarly, the compiler issues an error if it encounters a cache directory that was produced by a later version of the compiler.

Although the template cache directories produced by the C++ 5.0 compiler are not marked with version identifiers, the current compiler processes the 5.0 cache directories without an error or a warning. The compiler converts the 5.0 cache directories to the directory format that it uses.

The C++ 5.0 compiler cannot use a cache directory that is produced by a later release of the compiler. The C++ 5.0 compiler is not capable of recognizing format differences and it will issue an assertion when it encounters a cache directory that is produced by the C++ 5.1 compiler or by a later release.

When you upgrade your compiler, it is always good practice to clean the cache. Run CCadmin -clean on every directory that contains a template cache directory (in most cases, a template cache directory is named SunWS_cache). Alternatively, you can use rm -rf SunWS_cache.

2.4 Compiling and Linking

This section describes some aspects of compiling and linking programs. In the following example, CC is used to compile three source files and to link the object files to produce an executable file named prgrm.

example% CC file1.cc file2.cc file3.cc -o prgrm

2.4.1 Compile-Link Sequence

In the previous example, the compiler automatically generates the loader object files (file1.o, file2.o and file3.o) and then invokes the system linker to create the executable program for the file prgrm.

After compilation, the object files (file1.o, file2.o,and file3.o) remain. This convention permits you to easily relink and recompile your files.

If only one source file is compiled and a program is linked in the same operation, the corresponding .o file is deleted automatically. To preserve all .o files, do not compile and link in the same operation unless more than one source file gets compiled.

If the compilation fails, you will receive a message for each error. No .o files are generated for those source files with errors, and no executable program is written.

2.4.2 Separate Compiling and Linking

You can compile and link in separate steps. The -c option compiles source files and generates .o object files, but does not create an executable. Without the -c option, the compiler invokes the linker. By splitting the compile and link steps, a complete recompilation is not needed just to fix one file. The following example shows how to compile one file and link with others in separate steps:

example% CC -c file1.cc         Make new object file
example% CC -o prgrm file1.o file2.o file3.o       Make executable file

Be sure that the link step lists all the object files needed to make the complete program. If any object files are missing from this step, the link will fail with “undefined external reference” errors (missing routines).

2.4.3 Consistent Compiling and Linking

If you do compile and link in separate steps, consistent compiling and linking is critical when using the following compiler options:

• -B

• -compat

• –fast

• -g

• -g0

• -library

• -misalign

• -mt

• -p

• -xa

• -xarch

• –xcg92 and -xcg89

• -xipo

• -xpagesize

• -xpg

• -xprofile

• -xtarget

If you compile any subprogram using any of these options, be sure to link using the same option as well:

• In the case of the -library, -fast, -xtarget, and -xarch options, you must be sure to include the linker options that would have been passed if you had compiled and linked together.

• With -p, -xpg, and -xprofile, including the option in one phase and excluding it from the other phase will not affect the correctness of the program, but you will not be able to do profiling.

• With -g and -g0, including the option in one phase and excluding it from the other phase will not affect the correctness of the program, but it will affect the ability to debug the program. Any module that is not compiled with either of these options, but is linked with -g or -g0 will not be prepared properly for debugging. Note that compiling the module that contains the function main with the -g option or the -g0 option is usually necessary for debugging.

In the following example, the programs are compiled using the -xcg92 compiler option. This option is a macro for -xtarget=ss1000 and expands to: -xarch=v8 -xchip=super -xcache=16/64/4:1024/64/1.

 example% CC -c -xcg92 sbr.cc
 example% CC -c -xcg92 smain.cc
 example% CC -xcg92 sbr.o smain.o

If the program uses templates, it is possible that some templates will get instantiated at link time. In that case the command line options from the last line (the link line) will be used to compile the instantiated templates.

2.4.4 Compiling for SPARC V9

The compilation, linking, and execution of 64-bit objects is supported only in a V9 SPARC, Solaris 8 operating system with a 64-bit kernel running. Compilation for 64-bits is indicated by the –xarch=v9, –xarch=v9a, and -xarch=v9b options.

2.4.5 Diagnosing the Compiler

You can use the –verbose option to display helpful information while compiling a program, such as the names and version numbers of the programs that it invokes and the command line for each compilation phase.

Any arguments on the command line that the compiler does not recognize are interpreted as linker options, object program file names, or library names.

The basic distinctions are:

• Unrecognized options, which are preceded by a dash (–) or a plus sign (+), generate warnings.

• Unrecognized nonoptions, which are not preceded by a dash or a plus sign, generate no warnings. (However, they are passed to the linker. If the linker does not recognize them, they generate linker error messages.)

In the following example, note that -bit is not recognized by CC and the option is passed on to the linker (ld), which tries to interpret it. Because single letter ld options can be strung together, the linker sees -bit as -b -i -t, all of which are legitimate ld options. This might not be what you intend or expect:

example% CC -bit move.cc           < - -bit is not a recognized CC option

CC: Warning: Option -bit passed to ld, if ld is invoked, ignored otherwise

In the next example, the user intended to type the CC option -fast but omitted the leading dash. The compiler again passes the argument to the linker, which in turn interprets it as a file name:

example% CC fast move.cc           < -  The user meant to type -fast
move.CC:
ld: fatal: file fast: cannot open file; errno=2
ld: fatal: File processing errors. No output written to a.out

2.4.6 Understanding the Compiler Organization

The C++ compiler package consists of a front end, optimizer, code generator, assembler, template prelinker, and link editor. The CC command invokes each of these components automatically unless you use command-line options to specify otherwise.

Because any of these components may generate an error, and the components perform different tasks, it may be helpful to identify the component that generates an error. Use the -v and -dryrun options to help with this.

As shown in the following table, input files to the various compiler components have different file name suffixes. The suffix establishes the kind of compilation that is done. Refer to Table 2–1 for the meanings of the file suffixes.

2.5 Preprocessing Directives and Names

This section discusses information about preprocessing directives that is specific to the C++ compiler.

2.5.1 Pragmas

The preprocessor keyword pragma is part of the C++ standard, but the form, content, and meaning of pragmas is different for every compiler. See A.2.185 -z[ ]arg for a list of the pragmas that the C++ compiler recognizes.

2.5.2 Macros With a Variable Number of Arguments

The C++ compiler accepts #define preprocessor directives of the following form.

#define identifier (...) replacement_list
#define identifier (identifier_list, ...) replacement_list

If the macro parameter list ends with an ellipsis, an invocation of the macro is allowed to have more arguments than there are macro parameters. The additional arguments are collected into a single string, including commas, that can be referenced by the name __VA_ARGS__ in the macro replacement list. The following example demonstrates how to use a variable-argument-list macro.

#define debug(...) fprintf(stderr, __VA_ARGS__)
#define showlist(...) puts(#__VA_ARGS__)
#define report(test, ...) ((test)?puts(#test):\
                        printf(__VA_ARGS__))
debug(“Flag”);
debug(“X = %d\n”,x);
showlist(The first, second, and third items.);
report(x>y, “x is %d but y is %d”, x, y);

which results in the following:

fprintf(stderr, “Flag”);
fprintf(stderr, “X = %d\n”, x);
puts(“The first, second, and third items.”);
((x>y)?puts(“x>y”):printf(“x is %d but y is %d”, x, y));

2.5.3 Predefined Names

Table A–2 in the appendix shows the predefined macros. You can use these values in such preprocessor conditionals as #ifdef.The +p option prevents the automatic definition of the sun, unix, sparc, and i386 predefined macros.

2.5.4 #error

The #error directive no longer continues compilation after issuing a warning. The previous behavior of the directive was to issue a warning and continue compilation. The new behavior, consistent with other compilers, is to issue an error message and immediately halt compilation. The compiler quits and reports the failure.

2.6 Memory Requirements

The amount of memory a compilation requires depends on several parameters, including:

• Size of each procedure

• Level of optimization

• Limits set for virtual memory

• Size of the disk swap file

On the SPARC platform, if the optimizer runs out of memory, it tries to recover by retrying the current procedure at a lower level of optimization. The optimizer then resumes subsequent routines at the original level specified in the -xOlevel option on the command line.

If you compile a single source file that contains many routines, the compiler might run out of memory or swap space. If the compiler runs out of memory, try reducing the level of optimization. Alternately, split multiple-routine source files into files with one routine per file.

2.6.1 Swap Space Size

The swap -s command displays available swap space. See the swap(1M) man page for more information.

The following example demonstrates the use of the swap command:

example% swap -s
total: 40236k bytes allocated + 7280k reserved = 47516k used, 1058708k available

2.6.2 Increasing Swap Space

Use mkfile(1M) and swap (1M) to increase the size of the swap space on a workstation. (You must become superuser to do this.) The mkfile command creates a file of a specific size, and swap -a adds the file to the system swap space:

 example# mkfile -v 90m /home/swapfile
 /home/swapfile 94317840 bytes
 example# /usr/sbin/swap -a  /home/swapfile

2.6.3 Control of Virtual Memory

Compiling very large routines (thousands of lines of code in a single procedure) at -xO3 or higher can require a large amount of memory. In such cases, performance of the system might degrade. You can control this by limiting the amount of virtual memory available to a single process.

To limit virtual memory in an sh shell, use the ulimit command. See the sh(1) man page for more information.

The following example shows how to limit virtual memory to 16 Mbytes:

 example$ ulimit -d 16000

In a csh shell, use the limit command to limit virtual memory. See the csh(1) man page for more information.

The next example also shows how to limit virtual memory to 16 Mbytes:

 example% limit datasize 16M

Each of these examples causes the optimizer to try to recover at 16 Mbytes of data space.

The limit on virtual memory cannot be greater than the system’s total available swap space and, in practice, must be small enough to permit normal use of the system while a large compilation is in progress.

Be sure that no compilation consumes more than half the swap space.

With 32 Mbytes of swap space, use the following commands:

In an sh shell:

example$ ulimit -d 16000

In a csh shell:

example% limit datasize 16M

The best setting depends on the degree of optimization requested and the amount of real memory and virtual memory available.

2.6.4 Memory Requirements

A workstation should have at least 64 megabytes of memory; 128 Mbytes are recommended.

To determine the actual real memory, use the following command:

example% /usr/sbin/dmesg | grep mem
mem = 655360K (0x28000000)
avail mem = 602476544

2.7 Simplifying Commands

You can simplify complicated compiler commands by defining special shell aliases, using the CCFLAGS environment variable, or by using make.

2.7.1 Using Aliases Within the C Shell

The following example defines an alias for a command with frequently used options.

example% alias CCfx "CC -fast -xnolibmil"

The next example uses the alias CCfx.

example% CCfx any.C

The command CCfx is now the same as:

example% CC -fast -xnolibmil any.C

2.7.2 Using CCFLAGS to Specify Compile Options

You can specify options by setting the CCFLAGS variable.

The CCFLAGS variable can be used explicitly in the command line. The following example shows how to set CCFLAGS (C Shell):

 example% setenv CCFLAGS ’-xO2 -xsb’

The next example uses CCFLAGS explicitly.

 example% CC $CCFLAGS any.cc

When you use make, if the CCFLAGS variable is set as in the preceding example and the makefile’s compilation rules are implicit, then invoking make will result in a compilation equivalent to:

CC -xO2 -xsb files...

2.7.3 Using make

The make utility is a very powerful program development tool that you can easily use with all Sun compilers. See the make(1S) man page for additional information.

2.7.3.1 Using CCFLAGS Within make

When you are using the implicit compilation rules of the makefile (that is, there is no C++ compile line), the make program uses CCFLAGS automatically.

2.7.3.2 Adding a Suffix to Your Makefile

You can incorporate different file suffixes into C++ by adding them to your makefile. The following example adds .cpp as a valid suffix for C++ files. Add the SUFFIXES macro to your makefile:

SUFFIXES: .cpp .cpp~

(This line can be located anywhere in the makefile.)

Add the following lines to your makefile. Indented lines must start with a tab.

.cpp:
    $(LINK.cc) -o $@ $< $(LDLIBS)
.cpp~:
    $(GET) $(GFLAGS) -p $< > $*.cpp
    $(LINK.cc) -o $@ $*.cpp $(LDLIBS)
.cpp.o:
    $(COMPILE.cc) $(OUTPUT_OPTION) $<
.cpp~.o:
    $(GET) $(GFLAGS) -p $< > $*.cpp
    $(COMPILE.cc) $(OUTPUT_OPTION) $<
.cpp.a:
    $(COMPILE.cc) -o $% $<
    $(COMPILE.cc) -xar $@ $%
    $(RM) $%
.cpp~.a:
    $(GET) $(GFLAGS) -p $< > $*.cpp
    $(COMPILE.cc) -o $% $<
    $(COMPILE.cc) -xar $@ $%
    $(RM) $%

2.7.3.3 Using make With Standard Library Header Files

The standard library file names do not have .h suffixes. Instead, they are named istream, fstream, and so forth. In addition, the template source files are named istream.cc, fstream.cc, and so forth.

Chapter 3 Using the C++ Compiler Options

This chapter explains how to use the command-line C++ compiler options and then summarizes their use by function. Detailed explanations of the options are provided in 16.8 Using dlopen to Access a C++ Library From a C Program.

3.1 Syntax

The following table shows examples of typical option syntax formats that are used in this book.

Parentheses, braces, brackets, pipe characters, and ellipses are metacharacters used in the descriptions of the options and are not part of the options themselves. See the typographical conventions in “Before You Begin” at the front of this manual for a detailed explanation of the usage syntax.

3.2 General Guidelines

Some general guidelines for the C++ compiler options are:

• The– llib option links with library liblib.a (or liblib.so). It is always safer to put– llib after the source and object files to ensure the order in which libraries are searched.

• In general, processing of the compiler options is from left to right (with the exception that– U options are processed after all– D options), allowing selective overriding of macro options (options that include other options). This rule does not apply to linker options.

• The -features,–I -l, –L, -library, –pti, –R, -staticlib, -U, -verbose, and -xprefetch options accumulate, they do not override.

• The -D option accumulates, However, multiple -D options for the same name override each other.

Source files, object files, and libraries are compiled and linked in the order in which they appear on the command line.

3.3 Options Summarized by Function

In this section, the compiler options are grouped by function to provide a quick reference. For a detailed description of each option, refer to 16.8 Using dlopen to Access a C++ Library From a C Program.

The options apply to all platforms except as noted; features that are unique to the Solaris OS on SPARC-based systems are identified as SPARC, and the features that are unique to the Solaris OS on x86-based systems are identified as x86.

3.3.1 Code Generation Options

3.3.2 Compile-Time Performance Options

3.3.3 Compile-Time and Link-Time Options

The following table lists the options that must be specified both at link-time and at compile-time.

3.3.4 Debugging Options

3.3.5 Floating-Point Options

3.3.6 Language Options

3.3.7 Library Options

3.3.8 Licensing Options

3.3.9 Obsolete Options

The following options are either currently obsolete and so no longer accepted by the compiler, or they will be removed in a future release.

3.3.10 Output Options

3.3.11 Run-Time Performance Options

3.3.12 Preprocessor Options

3.3.13 Profiling Options

3.3.14 Reference Options

3.3.15 Source Options

3.3.16 Template Options

3.3.17 Thread Options