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1 /* GL_LINK_WARNING("literal string") arranges to emit the literal string as
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2 a linker warning on most glibc systems.
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3 We use a linker warning rather than a preprocessor warning, because
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4 #warning cannot be used inside macros. */
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5 #ifndef GL_LINK_WARNING
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6 /* This works on platforms with GNU ld and ELF object format.
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7 Testing __GLIBC__ is sufficient for asserting that GNU ld is in use.
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8 Testing __ELF__ guarantees the ELF object format.
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9 Testing __GNUC__ is necessary for the compound expression syntax. */
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10 # if defined __GLIBC__ && defined __ELF__ && defined __GNUC__
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11 # define GL_LINK_WARNING(message) \
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12 GL_LINK_WARNING1 (__FILE__, __LINE__, message)
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13 # define GL_LINK_WARNING1(file, line, message) \
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14 GL_LINK_WARNING2 (file, line, message) /* macroexpand file and line */
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15 # define GL_LINK_WARNING2(file, line, message) \
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16 GL_LINK_WARNING3 (file ":" #line ": warning: " message)
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17 # define GL_LINK_WARNING3(message) \
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18 ({ static const char warning[sizeof (message)] \
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19 __attribute__ ((__unused__, \
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20 __section__ (".gnu.warning"), \
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21 __aligned__ (1))) \
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22 = message "\n"; \
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23 (void)0; \
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24 })
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25 # else
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26 # define GL_LINK_WARNING(message) ((void) 0)
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27 # endif
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28 #endif
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