Fix eaassert.h include guard #3
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`eassert.h` does not have a strict enough include guard to trigger the multiple inclusion optimization on most compilers. The `#if defined(EA_PRAGMA_ONCE_SUPPORTED)` check occurs before any include of `eacompilertraits.h` (where `EA_PRAGMA_ONCE_SUPPORTED` is defined) so the preprocessor sees the `#pragma once` only if `eassert.h` is included **after** another header that includes `eacompilertraits.h`. The traditional include guard is also not strict enough to trigger the multiple-inclusion optimization as the only tokens that can appear outside of the `#ifdef`/`#endif` pair are whitespace, comments, and the null directive `#` (for certain compilers https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html). However, the previously mentioned `EA_PRAGMA_ONCE_SUPPORTED` check disables this optimization. This commit moves the `#pragma once` code after the include directive where `EA_PRAGMA_ONCE_SUPPORTED` would be defined. It also tidies up the traditional include guard so that it satisfies the stricter rules mentioned above. This was issues was found with IncludeGuardian 0.0.7.
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The full output from IncludeGuardian (https://includeguardian.io) with this particular issue highlighted can be found here https://gist.github.com/IncludeGuardian/a3716704237848e258471471b058879a#file-eastl-yaml-L160-L161 |
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@grojo-ea Would anyone be able to take a look at this? |
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eaassert.hdoes not have a strict enough include guard to trigger the multiple inclusion optimization on most compilers.The
#if defined(EA_PRAGMA_ONCE_SUPPORTED)check occurs before any include ofeacompilertraits.h(whereEA_PRAGMA_ONCE_SUPPORTEDis defined) so the preprocessor sees the#pragma onceonly ifeaassert.his included after another header that includeseacompilertraits.h.The traditional include guard is also not strict enough to trigger the multiple-inclusion optimization as the only tokens that can appear outside of the
#ifdef/#endifpair are whitespace, comments, and the null directive#(for certain compilershttps://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html). However, the previously mentioned
EA_PRAGMA_ONCE_SUPPORTEDcheck disables this optimization.This commit moves the
#pragma oncecode after the include directive whereEA_PRAGMA_ONCE_SUPPORTEDwould be defined. It also tidies up the traditional include guard so that it satisfies the stricter rules mentioned above.This was issues was found with IncludeGuardian 0.0.7.