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Pass -fwrapv option to compiler

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espeak source code uses signed integer wrapping (e.g. wavephase in
wavegen.c's Wavegen). It happens that this is undefined behavior, so a
compiler would be free optimize away various situations... Fortunately gcc
has an -fwrapv option to make signed integer wrapping defined.

Options would be needed for other compilers.
This commit is contained in:
Samuel Thibault
2022-03-11 18:38:37 +01:00
parent caccd5ad73
commit 3b8eeb2f7b
1 changed files with 9 additions and 0 deletions
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configure.ac
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@@ -311,6 +311,15 @@ AX_CHECK_COMPILE_FLAG([-Wuninitialized], [CFLAGS="-Wuninitialized $CFLAG
AX_CHECK_COMPILE_FLAG([-Wunused], [CFLAGS="-Wunused $CFLAGS"])
AX_CHECK_COMPILE_FLAG([-Wunused-parameter], [CFLAGS="-Wunused-parameter $CFLAGS"])
dnl ================================================================
dnl Enable two-complement signed integer wrapping
dnl
dnl Otherwise this is undefined behavior.
dnl ================================================================
AX_CHECK_COMPILE_FLAG([-fwrapv], [CFLAGS="-fwrapv $CFLAGS"])
dnl ================================================================
dnl libFuzzer checks.
dnl ================================================================