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Bug 1273048 - Add MOZ_GCC_VERSION_AT_MOST macro. r=froydnj

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MozReview-Commit-ID: 4VjAra5B6GM

--HG--
extra : transplant_source : %D3%C7C%05%7EB%24%90q%D3%22%C8%F5%8F%C7%C3%B4%00%A6%E2
This commit is contained in:
L. David Baron 2016-06-03 20:08:41 -07:00
parent 01cb7efe41
commit 97c2e11d8c
1 changed files with 4 additions and 1 deletions
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5
mfbt/Compiler.h
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@ -17,12 +17,15 @@
# undef MOZ_IS_GCC
# define MOZ_IS_GCC 1
/*
* This macro should simplify gcc version checking. For example, to check
* These macros should simplify gcc version checking. For example, to check
* for gcc 4.7.1 or later, check `#if MOZ_GCC_VERSION_AT_LEAST(4, 7, 1)`.
*/
# define MOZ_GCC_VERSION_AT_LEAST(major, minor, patchlevel) \
((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) \
>= ((major) * 10000 + (minor) * 100 + (patchlevel)))
# define MOZ_GCC_VERSION_AT_MOST(major, minor, patchlevel) \
((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) \
<= ((major) * 10000 + (minor) * 100 + (patchlevel)))
# if !MOZ_GCC_VERSION_AT_LEAST(4, 8, 0)
# error "mfbt (and Gecko) require at least gcc 4.8 to build."
# endif