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| author | MarcoFalke <falke.marco@gmail.com> | 2020-12-15 18:59:52 +0100 |
|---|---|---|
| committer | MarcoFalke <falke.marco@gmail.com> | 2020-12-15 19:00:36 +0100 |
| commit | 8bb40d5f56c8e46f12786da0b6444cdde3b6f7c8 (patch) | |
| tree | 6a77bfc259d458c235ad79632c73550b2e2d10ee /configure.ac | |
| parent | a35a3466efd187a2e443aaa230472c8c22f5cfc3 (diff) | |
| parent | fa13e1b0c52738492310b6b421d8e38cb04da5b1 (diff) | |
Merge #20560: fuzz: Link all targets once
fa13e1b0c52738492310b6b421d8e38cb04da5b1 build: Add option --enable-danger-fuzz-link-all (MarcoFalke)
44444ba759480237172d83f42374c5c29c76eda0 fuzz: Link all targets once (MarcoFalke)
Pull request description:
Currently the linker is invoked more than 150 times when compiling with `--enable-fuzz`. This is problematic for several reasons:
* It wastes disk space north of 20 GB, as all libraries and sanitizers are linked more than 150 times
* It wastes CPU time, as the link step can practically not be cached (similar to ccache for object files)
* It makes it a blocker to compile the fuzz tests by default for non-fuzz builds #19388, for the aforementioned reasons
* The build file is several thousand lines of code, without doing anything meaningful except listing each fuzz target in a highly verbose manner
* It makes writing new fuzz tests unnecessarily hard, as build system knowledge is required; Compare that to boost unit tests, which can be added by simply editing an existing cpp file
* It encourages fuzz tests that re-use the `buffer` or assume the `buffer` to be concatenations of seeds, which increases complexity of seeds and complexity for the fuzz engine to explore; Thus reducing the effectiveness of the affected fuzz targets
Fixes #20088
ACKs for top commit:
practicalswift:
Tested ACK fa13e1b0c52738492310b6b421d8e38cb04da5b1
sipa:
ACK fa13e1b0c52738492310b6b421d8e38cb04da5b1. Reviewed the code changes, and tested the 3 different test_runner.py modes (run once, merge, generate). I also tested building with the new --enable-danger-fuzz-link-all
Tree-SHA512: 962ab33269ebd51810924c51266ecc62edd6ddf2fcd9a8c359ed906766f58c3f73c223f8d3cc49f2c60f0053f65e8bdd86ce9c19e673f8c2b3cd676e913f2642
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 8671cc8c92..e772268b04 100644 --- a/configure.ac +++ b/configure.ac @@ -170,6 +170,12 @@ AC_ARG_ENABLE([fuzz], [enable_fuzz=$enableval], [enable_fuzz=no]) +AC_ARG_ENABLE([danger_fuzz_link_all], + AS_HELP_STRING([--enable-danger-fuzz-link-all], + [Danger! Modifies source code. Needs git and gnu sed installed. Link each fuzz target (default no).]), + [enable_danger_fuzz_link_all=$enableval], + [enable_danger_fuzz_link_all=no]) + AC_ARG_WITH([qrencode], [AS_HELP_STRING([--with-qrencode], [enable QR code support (default is yes if qt is enabled and libqrencode is found)])], @@ -1624,6 +1630,7 @@ AM_CONDITIONAL([USE_SQLITE], [test "x$use_sqlite" = "xyes"]) AM_CONDITIONAL([USE_BDB], [test "x$use_bdb" = "xyes"]) AM_CONDITIONAL([ENABLE_TESTS],[test x$BUILD_TEST = xyes]) AM_CONDITIONAL([ENABLE_FUZZ],[test x$enable_fuzz = xyes]) +AM_CONDITIONAL([ENABLE_FUZZ_LINK_ALL],[test x$enable_danger_fuzz_link_all = xyes]) AM_CONDITIONAL([ENABLE_QT],[test x$bitcoin_enable_qt = xyes]) AM_CONDITIONAL([ENABLE_QT_TESTS],[test x$BUILD_TEST_QT = xyes]) AM_CONDITIONAL([ENABLE_BENCH],[test x$use_bench = xyes]) |