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| 60 | |
60 | |
| 61 | ecb.h makes sure that the following types are defined (in the expected way): |
61 | ecb.h makes sure that the following types are defined (in the expected way): |
| 62 | |
62 | |
| 63 | int8_t uint8_t int16_t uint16_t |
63 | int8_t uint8_t int16_t uint16_t |
| 64 | int32_t uint32_t int64_t uint64_t |
64 | int32_t uint32_t int64_t uint64_t |
| 65 | intptr_t uintptr_t ptrdiff_t |
65 | intptr_t uintptr_t |
| 66 | |
66 | |
| 67 | The macro C<ECB_PTRSIZE> is defined to the size of a pointer on this |
67 | The macro C<ECB_PTRSIZE> is defined to the size of a pointer on this |
| 68 | platform (currently C<4> or C<8>). |
68 | platform (currently C<4> or C<8>) and can be used in preprocessor |
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69 | expressions. |
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70 | |
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71 | For C<ptrdiff_t> and C<size_t> use C<stddef.h>. |
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72 | |
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73 | =head2 LANGUAGE/COMPILER VERSIONS |
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74 | |
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75 | All the following symbols expand to an expression that can be tested in |
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76 | preprocessor instructions as well as treated as a boolean (use C<!!> to |
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77 | ensure it's either C<0> or C<1> if you need that). |
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78 | |
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79 | =over 4 |
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80 | |
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81 | =item ECB_C |
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82 | |
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83 | True if the implementation defines the C<__STDC__> macro to a true value, |
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84 | which is typically true for both C and C++ compilers. |
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85 | |
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86 | =item ECB_C99 |
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87 | |
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88 | True if the implementation claims to be compliant to C99 (ISO/IEC |
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89 | 9899:1999) or any later version. |
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90 | |
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91 | Note that later versions (ECB_C11) remove core features again (for |
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92 | example, variable length arrays). |
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93 | |
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94 | =item ECB_C11 |
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95 | |
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96 | True if the implementation claims to be compliant to C11 (ISO/IEC |
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97 | 9899:2011) or any later version. |
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98 | |
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99 | =item ECB_CPP |
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100 | |
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101 | True if the implementation defines the C<__cplusplus__> macro to a true |
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102 | value, which is typically true for C++ compilers. |
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103 | |
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104 | =item ECB_CPP11 |
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105 | |
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106 | True if the implementation claims to be compliant to ISO/IEC 14882:2011 |
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107 | (C++11) or any later version. |
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108 | |
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109 | =item ECB_GCC_VERSION(major,minor) |
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110 | |
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111 | Expands to a true value (suitable for testing in by the preprocessor) |
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112 | if the compiler used is GNU C and the version is the given version, or |
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113 | higher. |
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114 | |
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115 | This macro tries to return false on compilers that claim to be GCC |
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116 | compatible but aren't. |
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117 | |
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118 | =back |
| 69 | |
119 | |
| 70 | =head2 GCC ATTRIBUTES |
120 | =head2 GCC ATTRIBUTES |
| 71 | |
121 | |
| 72 | A major part of libecb deals with GCC attributes. These are additional |
122 | A major part of libecb deals with GCC attributes. These are additional |
| 73 | attributes that you can assign to functions, variables and sometimes even |
123 | attributes that you can assign to functions, variables and sometimes even |
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… | |
| 581 | for (i = 0; i < ecb_array_length (primes); i++) |
631 | for (i = 0; i < ecb_array_length (primes); i++) |
| 582 | sum += primes [i]; |
632 | sum += primes [i]; |
| 583 | |
633 | |
| 584 | =back |
634 | =back |
| 585 | |
635 | |
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636 | =head2 SYMBOLS GOVERNING COMPILATION OF ECB.H ITSELF |
| 586 | |
637 | |
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638 | These symbols need to be defined before including F<ecb.h> the first time. |
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639 | |
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640 | =over 4 |
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641 | |
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642 | =item ECB_NO_THRADS |
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643 | |
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644 | If F<ecb.h> is never used from multiple threads, then this symbol can |
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645 | be defined, in which case memory fences (and similar constructs) are |
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646 | completely removed, leading to more efficient code and fewer dependencies. |
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647 | |
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648 | Setting this symbol to a true value implies C<ECB_NO_SMP>. |
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649 | |
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650 | =item ECB_NO_SMP |
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651 | |
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652 | The weaker version of C<ECB_NO_THREADS> - if F<ecb.h> is used from |
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653 | multiple threads, but never concurrently (e.g. if the system the program |
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654 | runs on has only a single CPU with a single core, no hyperthreading and so |
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655 | on), then this symbol can be defined, leading to more efficient code and |
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656 | fewer dependencies. |
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657 | |
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658 | =back |
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659 | |
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660 | |
