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Avoid -march=native when reproducible builds are wanted

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Distribution builds that intend to have verifiable binaries,
set the SOURCE_DATE_EPOCH variable. Those builds should not default
to -march=native so that verification builds can produce bit-identical
results on other CPUs of the same architecture.

See https://reproducible-builds.org/ for why this is good.

This patch was done while working on reproducible builds for openSUSE.
This commit is contained in:
Bernhard M. Wiedemann 2020-12-31 12:59:55 +01:00
parent a1eca8ca7e
commit b1526e06e6
1 changed files with 4 additions and 0 deletions
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4
CMakeLists.txt
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@ -178,6 +178,10 @@ string(TOLOWER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_LOWER)
# when ARCH is not set to an explicit identifier, cmake's builtin is used
# to identify the target architecture, to direct logic in this cmake script.
# Since ARCH is a cached variable, it will not be set on first cmake invocation.
if (NOT ARCH AND DEFINED ENV{SOURCE_DATE_EPOCH})
set(ARCH "default")
endif()
if (NOT ARCH_ID)
if (NOT ARCH OR ARCH STREQUAL "" OR ARCH STREQUAL "native" OR ARCH STREQUAL "default")
if(CMAKE_SYSTEM_PROCESSOR STREQUAL "")