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riscv: link libgcc for jemalloc's __ffsdi2 #180

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riscv: link libgcc for jemalloc's __ffsdi2 #180

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7 changes: 7 additions & 0 deletions jemalloc-sys/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -379,6 +379,13 @@ fn main() {
// during the final linking. https://github.com/riscv-collab/riscv-gcc/issues/12
if target.contains("riscv") {
println!("cargo:rustc-link-lib=atomic");
// Base rv64gc has no count-trailing-zeros instruction (that is Zbb), so gcc
// lowers the ffs in bit_util.h to a __ffsdi2 call. compiler_builtins carries
// the rest of the *di2 family but not that one, so a -nodefaultlibs link
// needs libgcc named, as on android above.
if compiler.is_like_gnu() {
println!("cargo:rustc-link-lib=gcc");
}
}
println!("cargo:rerun-if-changed=jemalloc");

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